X-ray Binary Luminosity Function Scaling Relations in Elliptical Galaxies: Evidence for Globular Cluster Seeding of Low-Mass X-ray Binaries in Galactic Fields

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dc.contributor.authorLehmer, Bret D.
dc.contributor.authorFerrell, Andrew P.
dc.contributor.authorDoore, Keith
dc.contributor.authorEufrasio, Rafael T.
dc.contributor.authorMonson, Erik B.
dc.contributor.authorAlexander, David M.
dc.contributor.authorBasu-Zych, Antara
dc.contributor.authorBrandt, William N.
dc.contributor.authorSivakoff, Greg
dc.contributor.authorTzanavaris, Panayiotis
dc.contributor.authorYukita, Mihoko
dc.contributor.authorFragos, Tassos
dc.contributor.authorPtak, Andrew
dc.date.accessioned2020-06-09T17:03:36Z
dc.date.available2020-06-09T17:03:36Z
dc.date.issued2020-04-27
dc.description.abstractWe 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 HST observed galaxies at D < 25 Mpc that have estimates of the globular cluster (GC) specific frequency (SN) reported in the literature. As such, we are able to directly classify X-ray-detected sources as being either 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 SN. We find that our field LMXB XLF models require a component that scales with SN, 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 SN < 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.en_US
dc.description.sponsorshipWe thank the anonymous referee for their thoughtful and helpful comments on the paper. These comments led to notable improvements in the quality and presentation of this work. We gratefully acknowledge support from the National Aeronautics and Space Administration (NASA) Astrophysics Data Analysis Program(ADAP) grant NNX16AG06G (B.D.L., A.F., K.D., R.T.E.), Chandra X-ray Center grant GO7-18077X (B.D.L. and A.F.), and Space Telescope Science Institute grant HST-GO-14852.001-A (B.D.L. and A.F.). W.N.B. thanks NASA ADAP grant 80NSSC18K0878 and the V.M. Willaman Endowment. G.R.S. acknowledges support from NSERC Discovery Grant RGPIN2016-06569. We made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Our work includes observations made with the NASA Galaxy Evolution Explorer (GALEX ). GALEX is operated for NASA by the California Institute of Technology under NASA contract NAS5-98034. This publication makes use of data products from the Two Micron All Sky Survey (2MASS), which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by NASA and the National Science Foundation (NSF). This work is based on observations made with the Spitzer Space Telescope, obtained from the NASA/IPAC Infrared Science Archive, both of which are operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. We acknowledge the use of public data from the Swift data archive.en_US
dc.description.urihttps://arxiv.org/abs/2004.13045en_US
dc.format.extent34 pagesen_US
dc.genrejournal articles preprintsen_US
dc.identifierdoi:10.13016/m2xvkd-mkqy
dc.identifier.citationBret D. Lehmer et al., X-ray Binary Luminosity Function Scaling Relations in Elliptical Galaxies: Evidence for Globular Cluster Seeding of Low-Mass X-ray Binaries in Galactic Fields, ApJS, https://arxiv.org/abs/2004.13045en_US
dc.identifier.urihttp://hdl.handle.net/11603/18849
dc.language.isoen_USen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Space Sciences and Technology
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Physics Department
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.titleX-ray Binary Luminosity Function Scaling Relations in Elliptical Galaxies: Evidence for Globular Cluster Seeding of Low-Mass X-ray Binaries in Galactic Fieldsen_US
dc.typeTexten_US

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