Bret D. Lehmer
X-Ray Binary Luminosity Function Scaling Relations in Elliptical Galaxies: Evidence for Globular Cluster Seeding of Low-mass X-Ray Binaries in Galactic Fields
Lehmer, Bret D.; Ferrell, Andrew P.; Doore, Keith; Eufrasio, Rafael T.; Monson, Erik B.; Alexander, David M.; Basu-Zych, Antara; Brandt, William N.; Sivakoff, Gregory R.; Tzanavaris, Panayiotis; Yukita, Mihoko; Fragos, Tassos; Ptak, Andrew
Authors
Andrew P. Ferrell
Keith Doore
Rafael T. Eufrasio
Erik B. Monson
Professor David Alexander d.m.alexander@durham.ac.uk
Professor
Antara Basu-Zych
William N. Brandt
Gregory R. Sivakoff
Panayiotis Tzanavaris
Mihoko Yukita
Tassos Fragos
Andrew Ptak
Abstract
We investigate X-ray binary (XRB) luminosity function (XLF) scaling relations for Chandra-detected populations of low-mass XRBs (LMXBs) within the footprints of 24 early-type galaxies. Our sample includes Chandra and Hubble Space Telescope observed galaxies at $D\lesssim 25$ Mpc that have estimates of the globular cluster (GC) specific frequency (S N ) reported in the literature. As such, we are able to directly classify X-ray-detected sources as being coincident with unrelated background/foreground objects, GCs, or sources that are within the fields of the galaxy targets. We model the GC and field LMXB population XLFs for all galaxies separately and then construct global models characterizing how the LMXB XLFs vary with galaxy stellar mass and S N . We find that our field LMXB XLF models require a component that scales with S N and has a shape consistent with that found for the GC LMXB XLF. We take this to indicate that GCs are "seeding" the galactic field LMXB population, through the ejection of GC LMXBs and/or the diffusion of the GCs in the galactic fields themselves. However, we also find that an important LMXB XLF component is required for all galaxies that scales with stellar mass, implying that a substantial population of LMXBs are formed "in situ," which dominates the LMXB population emission for galaxies with S N lesssim 2. For the first time, we provide a framework quantifying how directly associated GC LMXBs, GC-seeded LMXBs, and in situ LMXBs contribute to LMXB XLFs in the broader early-type galaxy population.
Citation
Lehmer, B. D., Ferrell, A. P., Doore, K., Eufrasio, R. T., Monson, E. B., Alexander, D. M., …Ptak, A. (2020). X-Ray Binary Luminosity Function Scaling Relations in Elliptical Galaxies: Evidence for Globular Cluster Seeding of Low-mass X-Ray Binaries in Galactic Fields. Astrophysical Journal Supplement, 248(2), Article 31. https://doi.org/10.3847/1538-4365/ab9175
Journal Article Type | Article |
---|---|
Acceptance Date | Apr 20, 2020 |
Online Publication Date | Jun 10, 2020 |
Publication Date | 2020-06 |
Deposit Date | Jul 8, 2020 |
Publicly Available Date | Mar 28, 2024 |
Journal | Astrophysical Journal Supplement |
Print ISSN | 0067-0049 |
Electronic ISSN | 1538-4365 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 248 |
Issue | 2 |
Article Number | 31 |
DOI | https://doi.org/10.3847/1538-4365/ab9175 |
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Copyright Statement
© 2020. The American Astronomical Society. All rights reserved.
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