Ota et al. find no evidence using Suzaku data for bulk motions in the Centaurus cluster in contrast to the claim using Chandra data.
Weisskopf et al. place stringent upper limits on X-ray emission from a single, cool, magnetic WD. They also note a statistical methodology for detecting a source when there are very few counts in the source and background.
Schwope et al. conclude on the basis of deep XMM spectroscopy that one at least of the two absorption lines in the spectrum of the isolated NS RBS1223 must be of atomic origin because their flux ratio is not consistent with a cyclotron origin for both.
Balestra et al. combine the analysis of Chandra observations of 56 clusters to examine the Fe abundance change with redshift finding a decrease parametrized as (1+z)^-1.25.
Cen shows that if gas disk accretion onto a SMBH is only efficient for a surface density > 10g/cm^2 then the SMBH mass - bulge velocity dispersion relation results.
Kondratko et al. report the discovery of 5 more AGN with water masers.
Schmidt & Allen present Chandra observations of 34 massive, dynamically relaxed clusters and find that the NFW model provides an acceptable fit in ~80% of cases.
Jeffery et al. support the proposal that the SNIa 2003fg had a progenitor above the Chandrasekhar limit.
Bogdanovic et al. discuss possible EM signals from close binary SMBH.
Monday, September 25, 2006
Monday, September 18, 2006
Preprints
Tegmark et al. present the cosmological results from the real-space power spectrum based on the SDSS luminous red galaxy survey. Baryon oscillations are clearly detected at a mean z=0.35.
Anderson et al. continue their work cross-correlating RASS sources with the SDSS to generate a large sample of X-ray emitting AGN.
Pratt et al. present temperature profiles from XMM observations of a representative sample of nearby clusters. Outside the core they find similar profiles which agree well with numerical simulations.
Hogan summarizes current ideas on gravitational wave tests for new physics.
Brewer et al. describe a Bayesian MCMC approach to extract stellar oscillation frequencies from light curves.
Elvis et al. describe an active-optics concept for making high resolution mirrors with low mass/unit area.
Poole et al. show the results of SPH simulations of mergers between idealised X-ray clusters. They reproduce the features observed in Chandra and XMM observations and note that neither of the compact cores of the merging clusters are disrupted.
Petric et al. put limits on extragalactic dust from the lack of a halo in a Chandra observation of a z=4.3 quasar.
Albrecht et al. is the report of the dark energy task force.
Wright describes a handy cosmology calculator for times and distances as a function of redshift.
Anderson et al. continue their work cross-correlating RASS sources with the SDSS to generate a large sample of X-ray emitting AGN.
Pratt et al. present temperature profiles from XMM observations of a representative sample of nearby clusters. Outside the core they find similar profiles which agree well with numerical simulations.
Hogan summarizes current ideas on gravitational wave tests for new physics.
Brewer et al. describe a Bayesian MCMC approach to extract stellar oscillation frequencies from light curves.
Elvis et al. describe an active-optics concept for making high resolution mirrors with low mass/unit area.
Poole et al. show the results of SPH simulations of mergers between idealised X-ray clusters. They reproduce the features observed in Chandra and XMM observations and note that neither of the compact cores of the merging clusters are disrupted.
Petric et al. put limits on extragalactic dust from the lack of a halo in a Chandra observation of a z=4.3 quasar.
Albrecht et al. is the report of the dark energy task force.
Wright describes a handy cosmology calculator for times and distances as a function of redshift.
Thursday, September 14, 2006
PGPLOT - new ps driver
There were a few problems in the HEAsoft 6 release stemming from the new PS driver we introduced. The QDP font command didn't work correctly, the grfont.dat file was switched from binary to ascii introducing conflicts if the user already had PGPLOT installed, and a new file pgprolog.ps was required also leading to potential conflicts. All these have been fixed in a patch available from the HEAsoft bugs page.
UPDATE: A couple more problems were spotted by Glenn Morris. Symbols didn't work correctly in sub and superscripts and several symbols did not plot. I fixed the sub and superscript problem and at the same time added the ability to deal with multiple levels of sub/superscripts. Some of the symbol problems were due to a typo. Others still remain because there is no equivalent in a PS font for some Hershey symbols. The most important one appears to be the Solar symbol. It may be necessary to handle this one as a special case by writing an "O" then backspacing and shifting vertically and writing a "."
Keywords: HEAsoft, pgplot
UPDATE: A couple more problems were spotted by Glenn Morris. Symbols didn't work correctly in sub and superscripts and several symbols did not plot. I fixed the sub and superscript problem and at the same time added the ability to deal with multiple levels of sub/superscripts. Some of the symbol problems were due to a typo. Others still remain because there is no equivalent in a PS font for some Hershey symbols. The most important one appears to be the Solar symbol. It may be necessary to handle this one as a special case by writing an "O" then backspacing and shifting vertically and writing a "."
Keywords: HEAsoft, pgplot
Preprints
Hicks et al. report on Chandra and optical observations of the CNOC subsample of EMSS clusters and find excellent agreement between X-ray, dynamical and lensing mass estimates.
Iye et al. find a galaxy at z=6.96 with star formation at ~10 Msun/yr.
Babich & Loeb claim that Thomson scattering off electrons in the outflows from Lyman Break Galaxies could produce CMB fluctuations on arcminute scales comparable to the level of those produced during reionization.
Kramer et al. summarize the results of 2.5 years of observations of the binary pulsar J0737 - these already match the predictions of GR to 0.05% and in future years will supersede the accuracy of Solar System tests.
Ballantyne et al. calculate Spitzer AGN luminosity functions using models of the CXRB and Cloudy.
Han & Zhang compare the windowed FFT and Hilbert-Huang analysis methods for Poisson X-ray data and conclude that the windowed FFT is far superior.
Vierdayanti et al analyze XMM spectra of 4 ULX sources and conclude that they can be explained by super-critical accretion (and hence slim disks) onto stellar mass BHs.
Feldmann et al. present ZEBRA, a Bayesian photometric redshift estimation code.
Hajian et al. describes the Hamiltonian Monte Carlo method applied to cosmological parameter estimation and notes that it offers efficiency advantages over MCMC.
Croston et al. have developed a regularization procedure for deprojecting and PSF-correcting XMM observations of clusters.
Iye et al. find a galaxy at z=6.96 with star formation at ~10 Msun/yr.
Babich & Loeb claim that Thomson scattering off electrons in the outflows from Lyman Break Galaxies could produce CMB fluctuations on arcminute scales comparable to the level of those produced during reionization.
Kramer et al. summarize the results of 2.5 years of observations of the binary pulsar J0737 - these already match the predictions of GR to 0.05% and in future years will supersede the accuracy of Solar System tests.
Ballantyne et al. calculate Spitzer AGN luminosity functions using models of the CXRB and Cloudy.
Han & Zhang compare the windowed FFT and Hilbert-Huang analysis methods for Poisson X-ray data and conclude that the windowed FFT is far superior.
Vierdayanti et al analyze XMM spectra of 4 ULX sources and conclude that they can be explained by super-critical accretion (and hence slim disks) onto stellar mass BHs.
Feldmann et al. present ZEBRA, a Bayesian photometric redshift estimation code.
Hajian et al. describes the Hamiltonian Monte Carlo method applied to cosmological parameter estimation and notes that it offers efficiency advantages over MCMC.
Croston et al. have developed a regularization procedure for deprojecting and PSF-correcting XMM observations of clusters.
Monday, September 11, 2006
Preprints
Koyama et al. present Suzaku XIS observations of the Galactic Center region. Using the observed Fe and Ni emission lines they show that the plasma is collisional and in ionization equilibrium with an Fe abundance ~3.5 times Solar.
Gregory uses a Bayesian Kepler periodogram to find a second planet orbiting HD208487.
Nagai et al. analyze simulated Chandra observations of clusters and conclude that the ISM mass is estimated correctly to better than 6% while the total gravitating mass estimate is biassed low by 5-20% due bulk motion pressure support.
Raymond et al. argue from dynamical simulations that planetary systems with "Hot Jupiters" can harbour Earth-analogs in the habitable zone.
McCarthy et al. compare WMAP3 results with baryon fractions from cluster observations and conclude that Omega_m is probably 0.28-0.39, higher than the WMAP3 best-fit value.
Centrella summarizes recent advances in numerical relativity and the calculations of BH merger gravitational waveforms.
Arzner et al. discuss the efficacy of various statistical methods in spectral fitting and advocate unbinned maximum likelihood.
Angus et al. argue that the "bullet cluster" results comparing X-ray and lensing images can be explained by a combination of MOND and 2eV neutrinos.
Paczynski proposes a number of projects using small (~10-30 cm) telescopes to look for variable objects. He also proposes a small telescope at L1 to give warning of "killer asteroids".
Stroeer et al. discuss automated Bayesian inference for LISA data analysis.
Vignali et al. select type 2 quasars on the basis of [OIII] emission then observe them with Chandra - their results support the idea that type 2 quasars are heavily absorbed in the X-ray.
Gregory uses a Bayesian Kepler periodogram to find a second planet orbiting HD208487.
Nagai et al. analyze simulated Chandra observations of clusters and conclude that the ISM mass is estimated correctly to better than 6% while the total gravitating mass estimate is biassed low by 5-20% due bulk motion pressure support.
Raymond et al. argue from dynamical simulations that planetary systems with "Hot Jupiters" can harbour Earth-analogs in the habitable zone.
McCarthy et al. compare WMAP3 results with baryon fractions from cluster observations and conclude that Omega_m is probably 0.28-0.39, higher than the WMAP3 best-fit value.
Centrella summarizes recent advances in numerical relativity and the calculations of BH merger gravitational waveforms.
Arzner et al. discuss the efficacy of various statistical methods in spectral fitting and advocate unbinned maximum likelihood.
Angus et al. argue that the "bullet cluster" results comparing X-ray and lensing images can be explained by a combination of MOND and 2eV neutrinos.
Paczynski proposes a number of projects using small (~10-30 cm) telescopes to look for variable objects. He also proposes a small telescope at L1 to give warning of "killer asteroids".
Stroeer et al. discuss automated Bayesian inference for LISA data analysis.
Vignali et al. select type 2 quasars on the basis of [OIII] emission then observe them with Chandra - their results support the idea that type 2 quasars are heavily absorbed in the X-ray.
Thursday, September 07, 2006
gti extension names for Suzaku
It appears we have an inconsistency in that the standard name for a gti extension used for suzaku is GTI however xselect is currently set up for STDGTI hence is used cleaned event files from processing. Changed xselect.mdb to to use GTI.
Tested what happens if xselect is used on an input event file with a gti name different from that set in the xselect.mdb. Reading event files with the "wrong" name for the gti extension doesn't seem to be a problem however using "load obscat" then "choose" produces an error message. I need to change the code so these cases are dealt with the same way. Also, shouldn't using DSS keywords get round this issue ?
Update: Modified xsel_read.f and xsel_mission.f so that the read and choose commands will work correctly for either STDGTI or GTI. Note that using DSS keywords doesn't help at present - should xselect be modified to use them ?
Keywords: HEAsoft, xselect, Suzaku
Tested what happens if xselect is used on an input event file with a gti name different from that set in the xselect.mdb. Reading event files with the "wrong" name for the gti extension doesn't seem to be a problem however using "load obscat" then "choose" produces an error message. I need to change the code so these cases are dealt with the same way. Also, shouldn't using DSS keywords get round this issue ?
Update: Modified xsel_read.f and xsel_mission.f so that the read and choose commands will work correctly for either STDGTI or GTI. Note that using DSS keywords doesn't help at present - should xselect be modified to use them ?
Keywords: HEAsoft, xselect, Suzaku
Tuesday, August 01, 2006
bldg2 printers
To print from the Unix shell under Tiger the printer name needs to include the machine name eg duplex4@lhea4.
Keywords: system
Keywords: system
Monday, July 31, 2006
Preprints
Davis et al. describe the multiwavelength extended Groth strip survey with observations from radio to X-ray.
Graham & Driver derive a quadratic relation between BH mass and bulge concentration.
Li Ji et al. develop a non-equilibrium ionization model for stellar cluster winds.
Bridges et al. do a full-up Bayesian analysis of the 3-year WMAP and LSS data and conclude that the n=1 spectrum can be ruled out and that the form of the deviation from n=1 differs from a power-law.
Malbon et al. graft black hole growth onto their galaxy formation model based on LCDM and predict the number and sizes of BH mergers.
Graham & Driver derive a quadratic relation between BH mass and bulge concentration.
Li Ji et al. develop a non-equilibrium ionization model for stellar cluster winds.
Bridges et al. do a full-up Bayesian analysis of the 3-year WMAP and LSS data and conclude that the n=1 spectrum can be ruled out and that the form of the deviation from n=1 differs from a power-law.
Malbon et al. graft black hole growth onto their galaxy formation model based on LCDM and predict the number and sizes of BH mergers.
Friday, July 28, 2006
xspec11 error in tclout compinfo
Jeremy Sanders points out that the number of parameters in the model returned by tclout compinfo is one too few. Simple error in tclout.c which is patched as 11.3.2v.
Keywords: HEAsoft, xspec
Keywords: HEAsoft, xspec
Monday, July 24, 2006
xspec 11 memory allocation errors in fakeit and tclout
Jeremy Sanders provided some fixes to memory allocation of strings in fakeit.c and tclout.c. Some sizes were being set without including the null at the end. Bug fix 11.3.2u.
Keywords: HEAsoft, xspec
Keywords: HEAsoft, xspec
Friday, July 14, 2006
Preprints
Bouwens & Illingworth look for z~7-8 galaxies in NICMOS data and find less candidates than expected implying rapid evolution in the most luminous galaxies.
Wednesday, July 12, 2006
fix to genrsp
Randall spotted that the new v2.0 genrsp was only creating half-gaussian responses. This was due to a stupid error in clcrsp.f. v2.01 should get into the HEAsoft 6.1 release.
Keywords: genrsp, HEAsoft
Keywords: genrsp, HEAsoft
Preprints
Diehl & Statler present results of analyzing Chandra observations of 54 normal ellipticals. They find little correlation between optical and X-ray emission and conclude that the X-ray emitting gas is generally out of equilibrium and does not retain information about the shape of the underlying potential.
Park et al. develop a Bayesian treatment of hardness ratios.
Wilman et al. present optical integrated field spectroscopy of the H-alpha luminous central galaxies in the four cooling flow clusters and find disturbed emission coincident with secondary galaxies.
Wickham et al. develop the use of reversible jump MCMC to study SMBH binary systems with LISA.
de Freitas Pacheco et al. estimate the capture rate of compact objects by SMBH.
Sanders presents a new technique for performing spatially-resolved spectroscopy by selecting regions based on surface-brightness contours of the smoothed image.
Loeb looks at thermal evaporation from clusters and notes this could lead to a loss of at least a tenth of the gas at the cluster virial temperature.
Schnittman et al. use relativistic MHD simulations of accretion onto a non-rotating BH to predict features of the high-frequency power spectrum.
Trimble et al. present their annual summary of the year in astrophysics.
Heinz et al. find using numerical simulations that radio source morphologies can be significantly changed by bulk flows in the cluster gas.
Beckmann et al. present the 20-40 keV AGN luminosity function based on Integral observations covering 25000 deg^2 and detecting 38 extragalactic objects.
Lauer et al. argue that for brightest cluster galaxies the BH mass correlation with bulge luminosity is more likely to be correct than that with bulge velocity dispersion.
Arun examines the differences in parameter estimation between 3.5PN and 2PN for LISA observations of BH mergers.
Babak et al. present "kludge" gravitational waveforms for compact objects inspiralling around massive black holes.
Park et al. develop a Bayesian treatment of hardness ratios.
Wilman et al. present optical integrated field spectroscopy of the H-alpha luminous central galaxies in the four cooling flow clusters and find disturbed emission coincident with secondary galaxies.
Wickham et al. develop the use of reversible jump MCMC to study SMBH binary systems with LISA.
de Freitas Pacheco et al. estimate the capture rate of compact objects by SMBH.
Sanders presents a new technique for performing spatially-resolved spectroscopy by selecting regions based on surface-brightness contours of the smoothed image.
Loeb looks at thermal evaporation from clusters and notes this could lead to a loss of at least a tenth of the gas at the cluster virial temperature.
Schnittman et al. use relativistic MHD simulations of accretion onto a non-rotating BH to predict features of the high-frequency power spectrum.
Trimble et al. present their annual summary of the year in astrophysics.
Heinz et al. find using numerical simulations that radio source morphologies can be significantly changed by bulk flows in the cluster gas.
Beckmann et al. present the 20-40 keV AGN luminosity function based on Integral observations covering 25000 deg^2 and detecting 38 extragalactic objects.
Lauer et al. argue that for brightest cluster galaxies the BH mass correlation with bulge luminosity is more likely to be correct than that with bulge velocity dispersion.
Arun examines the differences in parameter estimation between 3.5PN and 2PN for LISA observations of BH mergers.
Babak et al. present "kludge" gravitational waveforms for compact objects inspiralling around massive black holes.
Preprints
Dotti et al discuss the EM signals or binary BH mergers detectable by LISA.
Maschenko et al. show that random bulk gas motions in primordial galaxies act to flatten the central dark matter cusps and hence solve the discrepancy between the predicted sharp cusps and observed flattened distributions.
Juett et al. present absorption edge results for Ne and Fe using HETG observations of X-ray binaries. They measure the Fe depletion onto dust grains and the Ne ionization structure of the ISM.
Kewley et al. analyze 85224 emission-line galaxies from the SDSS and derive a classification scheme which cleanly separates star-forming galaxies, AGN-HII composites, Seyferts and LINERs.
Cornish & Porter used annealed MCMC to extract the parameters for a SMBH binary embedded in a simulated LISA datastream.
Fregeau et al. discuss the detection probabilities with LISA and LIGO for IMBH binary mergers.
Dai et al. stack RASS data for over 4000 clusters selected from the 2MASS catalog and conclude that the relationships between mass, X-ray temperature, and X-ray luminosity are consistent with those for X-ray selected clusters.
McClintock et al. place a lower limit on the dimensional spin parameter for the BH in GRS1915 of 0.98 by modelling the X-ray continuum.
Schurch & Done model the soft X-ray emission from AGN as a failed disk wind where material is blown off the inner regions of the disk and falls back down onto the outer regions.
Rephaeli et al. analyze > 500 ksec of RXTE data on A2163 and derive a model where ~25 of the 3-50 keV emission is from a non-thermal component.
Sun et al. present a survey of the X-ray coronae of galaxies in nearby clusters.
Maschenko et al. show that random bulk gas motions in primordial galaxies act to flatten the central dark matter cusps and hence solve the discrepancy between the predicted sharp cusps and observed flattened distributions.
Juett et al. present absorption edge results for Ne and Fe using HETG observations of X-ray binaries. They measure the Fe depletion onto dust grains and the Ne ionization structure of the ISM.
Kewley et al. analyze 85224 emission-line galaxies from the SDSS and derive a classification scheme which cleanly separates star-forming galaxies, AGN-HII composites, Seyferts and LINERs.
Cornish & Porter used annealed MCMC to extract the parameters for a SMBH binary embedded in a simulated LISA datastream.
Fregeau et al. discuss the detection probabilities with LISA and LIGO for IMBH binary mergers.
Dai et al. stack RASS data for over 4000 clusters selected from the 2MASS catalog and conclude that the relationships between mass, X-ray temperature, and X-ray luminosity are consistent with those for X-ray selected clusters.
McClintock et al. place a lower limit on the dimensional spin parameter for the BH in GRS1915 of 0.98 by modelling the X-ray continuum.
Schurch & Done model the soft X-ray emission from AGN as a failed disk wind where material is blown off the inner regions of the disk and falls back down onto the outer regions.
Rephaeli et al. analyze > 500 ksec of RXTE data on A2163 and derive a model where ~25 of the 3-50 keV emission is from a non-thermal component.
Sun et al. present a survey of the X-ray coronae of galaxies in nearby clusters.
extractor on OSF
The HEAsoft 6.1 version of extractor fails under OSF with
exception system: exiting due to internal error: out of memory trying to allocate exception system resources
We have no explanation for this at present. It appears to happen before any extractor code is executed.
Keywords: HEAsoft, extractor, OSF
exception system: exiting due to internal error: out of memory trying to allocate exception system resources
We have no explanation for this at present. It appears to happen before any extractor code is executed.
Keywords: HEAsoft, extractor, OSF
Tuesday, July 11, 2006
extractor on Intel Mac
Fixed a bug when writing the XRONOS window file which showed up on the Intel Mac although since it was a format statement error we should have run into it before. v4.67.
Keywords: HEAsoft, extractor
Keywords: HEAsoft, extractor
Monday, July 10, 2006
xselect.mdb for Suzaku
At Koji's suggestion changed mkf_def_expr to ae*.mkf, since all relevant parameters are now included in the mkf file, and mkf_rel_dir to ../../auxil to conform to the v1 processing output.
Keywords: HEAsoft, xselect, Suzaku
Keywords: HEAsoft, xselect, Suzaku
Friday, July 07, 2006
pgplot /gif and /ppm drivers
Created C implementations of the pgplot /gif and /ppm drivers. The fortran versions of these use %VAL so fail on some fortran compilers. Used f2c to create a candidate C version then did a fair amount of tidying up. Confirmed that the drivers work correctly under Tiger but they may need tweaking for other systems.
Update: Added C implementation of pgplot /wd driver. More careful testing showed up a few discrepancies between the output files from the Fortran and C versions. After fixing some bugs the /ppm and /wd drivers produced identical binary output files from the Fortran and C versions. The /gif drivers produced small differences however these output files appear to be time-dependent since both the Fortran and C implementations produce slightly different binary files in successive runs. This was because the CODE array was not completely initialized to zero (one dimension was looped from 0 to 4095 not 0 to 4097 as required).
Keywords : heasoft, pgplot
Update: Added C implementation of pgplot /wd driver. More careful testing showed up a few discrepancies between the output files from the Fortran and C versions. After fixing some bugs the /ppm and /wd drivers produced identical binary output files from the Fortran and C versions. The /gif drivers produced small differences however these output files appear to be time-dependent since both the Fortran and C implementations produce slightly different binary files in successive runs. This was because the CODE array was not completely initialized to zero (one dimension was looped from 0 to 4095 not 0 to 4097 as required).
Keywords : heasoft, pgplot
Tuesday, June 20, 2006
PostScript driver
Another couple of tweaks to the PS driver to fix bugs. The code included some instances of the
string "\\" which were assumed to be interpreted by the compiler as "\". This doesn't work on all compilers so replaced this with char(92). Also, the prolog was being written with two instances of "%% Orientation", one specifying Landscape and the other Portrait. This was confusing Illustrator on the Mac.
Keywords: HEAsoft, pgplot
string "\\" which were assumed to be interpreted by the compiler as "\". This doesn't work on all compilers so replaced this with char(92). Also, the prolog was being written with two instances of "%% Orientation", one specifying Landscape and the other Portrait. This was confusing Illustrator on the Mac.
Keywords: HEAsoft, pgplot
Tuesday, June 06, 2006
more XIS contamination models
After prompting by Aya Kubota I've made a model xiscoabh for the HXD nominal pointing position and xispcoab with an additional parameter giving the off-axis angle. Both these use the expression for column-depth vs off-axis angle from Dotani-san's e-mail.
Keywords: Suzaku
Keywords: Suzaku
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