The University of Southampton
University of Southampton Institutional Repository

# The observed vs total population of ULXs

Wiktorowicz, Grzegorz, Lasota, Jean-Pierre, Middleton, Matthew and Belczynski, Krzysztof (2019) The observed vs total population of ULXs. The Astronomical Journal, 875 (1), [53].

Record type: Article

## Abstract

We have analyzed how anisotropic emission of radiation affects the observed sample of ultraluminous X-ray sources (ULXs) by performing simulations of the evolution of stellar populations, employing recent developments in stellar and binary physics, and by utilizing a geometrical beaming model motivated by theory and observation. While ULXs harboring black hole accretors (BH ULXs) are typically emitting isotropically, the majority of ULXs with neutron star accretors (NS ULXs) are found to be beamed. These findings confirm previous assertions that a significant fraction of ULXs are hidden from view due to a substantial misalignment of the emission beam and the line of sight. We find the total number of NS ULXs in regions with constant star formation (SF), solar metallicity, and ages above $\sim 1\,\mathrm{Gyr}$ to be higher than the BH ULXs, although observationally both populations are comparable. For lower metallicities, BH ULX dominate both the total and observed ULX populations. As far as burst SF is concerned, young ULX populations are dominated by BH ULXs, but this changes as the population ages and, post SF, NS ULXs dominate both the observed and total ULX populations. We also compare our simulation output to a previous analytical prediction for the relative ratio of BH to NS ULXs in idealized flux-limited observations and find broad agreement for all but the lowest metallicities. In so doing, we find that in such surveys the observed ULX population should be heavily dominated by black hole systems rather than by systems containing neutron stars.

Text
The Observed versus Total Population of ULXs - Accepted Manuscript

Accepted/In Press date: 11 March 2019
e-pub ahead of print date: 16 April 2019
Published date: 16 April 2019
Additional Information: arXiv document is AM

## Identifiers

Local EPrints ID: 430986
URI: http://eprints.soton.ac.uk/id/eprint/430986
ISSN: 1538-3881

## Catalogue record

Date deposited: 21 May 2019 16:30

## Contributors

Author: Grzegorz Wiktorowicz
Author: Jean-Pierre Lasota
Author: Krzysztof Belczynski