Friday, December 23, 2005


Page et al. find that broad-lined z~2 QSOs with X-ray absorption are embedded in submillimeter luminous starbursts implying that the X-ray absorption is unrelated to the AGN torus.

Balogh et al. compare analytical models of the ICM with recent observations and find that a range of entropy floors are required at a given halo mass.

Ho et al. use large-scale simulations to study cluster ellipticity as a cosmological probe and conclude that it provides another route to constraining cosmological parameters from large cluster samples.

Fang et al. argue that the z~0 absorbers seen in high resolution spectra of AGN are due to the hot gas associated with the Galaxy.

Sorkin republishes an old paper using Bayesian methods to derive a goodness-of-fit balancing likelihood against the number of fitting parameters.

Belczynski et al. describe the StarTrack population synthesis code for the formation and evolution of compact objects.

Dunn et al. discuss the behaviour of rising bubbles in the ICM and the precession of the 3C 84 jets in the Perseus clusters.

Thursday, December 22, 2005


Crummy et al. fit XMM spectra from a sample of SyI with a relativistically-blurred photoionized disc and find this model reproduces the continuum shape, including the soft excess and many features usually interpreted as absorption, in all sources.

Fabbiano reviews X-ray source populations in galaxies.

Vernaleo & Reynolds perform 3-D hydro simulations of jets in the ICM and find that the jet energy input cannot halt the cooling flow because the energy is transmitted out of the cooling region along a low-density channel.

Sun et al. observe a 70 kpc tail behind a late-type galaxy in A3627 and use this to place constraints on turbulence in the ICM.

Jahoda et al. summarize the RXTE PCA calibration.

Hamilton et al. use archival WFPC2 imaging of 70 QSOs to find a relation between nuclear luminosity and the size and effective surface magnitude of the bulge.

Bridges et al. present a Bayesian analysis of the primordial power-law spectrum.

Baker et al. present new numerical GR techniques which enable accurate determination of GW signal from merging BHs.

Hughes motivates the widespread acceptance of BHs and describes planned tests of the hypothesis.

Nath et al. consider the production of Li6 by spallation of cosmic rays on ambient gas and show that the amount of energy generated is consistent with the extra entropy seen in the ICM.

Agueros et al. cross-correlate the RASS and SDSS looking for X-ray sources with no optical counterparts as a way of searching for isolated NS.

Cappi et al. present the results from a complete XMM survey of nearby AGN and find results broadly in agreement with the standard unified model.

Wednesday, December 21, 2005


Bregman shows that a claimed relationship between radio, X-ray luminosity, and BH mass in AGN is an artefact of the flux-limited sample.

Armus et al. find evidence with Spitzer for an AGN in NGC 6240 - consistent with the hard X-ray results.

Stuhlinger et al. summarize the status of XMM-Newton calibration.

Donahue et al. present Chandra entropy profiles of 9 cooling flow clusters and find the profiles are similar over a range of 3 in temperature.

Ghizzardi et al. find cold fronts in 21 out of 62 clusters searched using XMM data.

Monday, December 19, 2005


Badenes et al. compare the XMM and Chandra observations of Tycho with detailed hydro calculations of a variety of proposed models for SNIa and find the observations are consistent with a 1-D delayed detonation model.

Weinberg discusses multiverses and anthropic arguments.

Mathews et al. show that spherical shock waves in the ICM dissipate most of their energy near the center of the cluster causing temperatures higher than observed hence are not good candidates for solving the cooling flow problem.

Henry et al. present the results from the complete ROSAT NEP survey.

Haehnelt et al. suggest that the bright QSO HE0450 which has no detected galaxy is an SMBH ejected from its galaxy during a merger. However Merritt et al. argue against this since the kick velocity required is too large and claim that previous observations have overestimated the size of the SMBH and hence the expected luminosity of the underlying galaxy.

Bregman et al. summarize their results of OVI observations of 24 galaxies using FUSE. They find a correlation between the cooling flow rate from OVI and that from X-rays but with a large scatter. The cause of the scatter is not clear but is not obviously due to heating.

Weisskopf & Hughes give an overview of the first 6 years of Chandra observations of SNR.

Friday, December 16, 2005


Kim et al. combine Chandra and HST data to examine the relationship between LMXBs and Globular Clusters in 6 Elliptical galaxies. They confirm that the probability of a GC containing a LMXB correlates with metallicity and also find a correlation with galactocentric distance.

Dravins et al. discuss the design of an optical instrument designed to search for variability on nanosecond scales and planned for the 100m-class OWL telescope.

Kashlinsky et al. use fluctuations in the background of a deep Spitzer observation to find evidence for Pop III stars.

Thursday, December 15, 2005


Noble et al. describe parallelizing ISIS using the PVM.

Chevallier et al. discuss the relative roles of absorption and reflection in low energy X-ray spectra of AGN.

Belczynski et al. calculates the contribution to the LISA signal from mass transferring binaries.

Hallman et al. present calculations of H_0 based on X-ray/SZE observations of clusters assuming a universal temperature profile. This gives H_0 values closer to the standard and with smaller variance.

Blustin et al. do principle component analysis of the X-ray variability of NGC 7469.

seg fault in pexrav

Roderick Johnstone reported a seg fault in pexrav when running on a 64 bit Athlon. Craig spotted a problem on the first invocation of the model in the routine sigmabfa. There was a similar bug in pexriv, bexrav, and ntee which all use copies of this routine. At some point I need to rationalize all these programs and remove duplicated routines. Fixed as v11.3.2r and 12.2.1i & j.

Keywords: HEAsoft, xspec

Thursday, December 08, 2005

xselect manual

Updated the manual available on the web. Did the LaTeX and HTML conversion on genji in TEXT/XSELECT then copied to olegacy. Note that latex2html makes an xsel.tex top-level file. Copy that to xselect.html, remove all the contents links and tidy up. Add the contents links to node1.html. Change references in several files from xsel.tex to xselect.tex.

Keywords: HEAsoft, xselect

Thursday, December 01, 2005


Gastaldello et al. analyze Chandra and XMM observations of poor clusters and find cool cores, a peak in temperature around 0.1 virial radii and decline. NFW model fits give concentration parameters and virial masses consistent with numerical simulations.

Done & Gierlinski show that an apparent highly relativistic line in XTE J1650 can be modelled by a relativistic line and Fe K line absorption from an outflowing disk wind - this allows the inner disk to be truncated.

Dave et al. provide an overview of current issues in galaxy formation theory.

HEAsoft 6.0.4

HEAsoft 6.0.4 is now available. This is an update for Swift but also includes XSPEC v12.2.1 and
changes to cleansis and xselect/extractor for Suzaku.