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26 April 2024 |
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Article overview
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A census of ultraluminous X-ray sources in the local Universe | | Konstantinos Kovlakas
; Andreas Zezas
; Jeff J. Andrews
; Antara Basu-Zych
; Tassos Fragos
; Ann Hornschemeier
; Bret Lehmer
; Andrew Ptak
; | | Date: |
24 Aug 2020 | | Abstract: | Using the Chandra Source Catalog 2.0 and a newly compiled catalogue of
galaxies in the local Universe, we deliver a census of ultraluminous X-ray
source (ULX) populations in nearby galaxies. We find 629 ULX candidates in 309
galaxies with distance smaller than 40,Mpc. The foreground/background
contamination is ${sim}20\%$. The ULX populations in bona-fide star-forming
galaxies scale on average with star-formation rate (SFR) and stellar mass
($M_star$) such that the number of ULXs per galaxy is
$0.45^{+0.06}_{-0.09} imesfrac{
m SFR}{
m
M_odot,yr^{-1}}{+}3.3^{+3.8}_{-3.2} imesfrac{M_star}{
m M_odot}$. The
scaling depends strongly on the morphological type. This analysis shows that
early spiral galaxies contain an additional population of ULXs that scales with
$M_star$. We also confirm the strong anti-correlation of the ULX rate with the
host galaxy’s metallicity. In the case of early-type galaxies we find that
there is a non-linear dependence of the number of ULXs with $M_star$, which is
interpreted as the result of star-formation history differences. Taking into
account age and metallicity effects, we find that the predictions from X-ray
binary population synthesis models are consistent with the observed ULX rates
in early-type galaxies, as well as, spiral/irregular galaxies. | | Source: | arXiv, 2008.10572 | | Services: | Forum | Review | PDF | Favorites | |
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