| | |
| | |
Stat |
Members: 3643 Articles: 2'488'730 Articles rated: 2609
29 March 2024 |
|
| | | |
|
Article overview
| |
|
Revisiting with Chandra the Scaling Relations of the X-ray Emission Components (Binaries, Nuclei and Hot Gas) of Early Type Galaxies | Bram Boroson
; Dong-Woo Kim
; Giuseppina Fabbiano
; | Date: |
11 Nov 2010 | Abstract: | We have selected a sample of 30 normal (non-cD) early type galaxies, for all
of which optical spectroscopy is available, and which have been observed with
Chandra to a depth such to insure the detection of bright low-mass X-ray
binaries (LMXBs) with Lx>1e38 erg/s. This sample includes a larger fraction of
gas-poor galaxies than previously studied samples, and covers a wide range of
stellar luminosity, velocity dispersion, GC specific frequency, and stellar
age. We derive X-ray luminosities (or upper limits) from the different
significant X-ray components of these galaxies: nuclei, detected and undetected
LMXBs, coronally active binaries (ABs), cataclysmic variables (CVs), and hot
gas. The ABs and CVs contribution is estimated from the Lx-LK scaling relation
of M31 and M32. The contribution of undetected LMXBs is estimated both by
fitting the spectra of the unresolved X-ray emission and by extrapolating the
LMXB X-ray luminosity function. The results for the nuclei are consistent with
those discussed by Pellegrini (2010). We derive a revised scaling relation
between the integrated X-ray luminosity of LMXBs in a galaxy and the LK
luminosity of the host galaxy: Lx(LMXB)/LK ~ 1e29 erg s-1 LK-1 with 50% 1sigma
rms; moreover, we also obtain a tighter LX(LMXB)/LK - SN relation than
previously published. We revisit the relations between hot gas content and
other galaxy parameters. finding a steeper LX(gas)-LK relation with larger
scatter than reported in the literature. We find a positive correlation between
the luminosity and temperature of the hot ISM, significantly tighter than
reported by earlier studies.[abridged] | Source: | arXiv, 1011.2529 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |