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    X-Ray Binary Luminosity Function Scaling Relations for Local Galaxies Based on Subgalactic Modeling

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    Lehmer_2019_ApJS_243_3.pdf (4.904Mb)
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    https://iopscience.iop.org/article/10.3847/1538-4365/ab22a8
    Permanent Link
    https://doi.org/10.5281/zenodo.2875827
    http://hdl.handle.net/11603/14970
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    • UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
    • UMBC Faculty Collection
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    Author/Creator
    Lehmer, Bret D.
    Eufrasio, Rafael T.
    Tzanavaris, Panayiotis
    Basu-Zych, Antara
    Fragos, Tassos
    Prestwich, Andrea
    Yukita, Mihoko
    Zezas, Andreas
    Hornschemeier, Ann E.
    Ptak, Andrew
    Date
    2019-06-26
    Type of Work
    29 pages
    Text
    journal articles
    Citation of Original Publication
    Bret D. Lehmer, et.al, X-Ray Binary Luminosity Function Scaling Relations for Local Galaxies Based on Subgalactic Modeling, The Astrophysical Journal Supplement Series, Volume 243, Number 1, https://doi.org/10.5281/zenodo.2875827
    Rights
    This 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.
    ©2019 IOP Science
    Subjects
    galaxies: evolution
    stars: formation
    X-rays: binaries
    X-rays: galaxies
    Abstract
    We present new Chandra constraints on the X-ray luminosity functions (XLFs) of X-ray binary (XRB) populations, as well as their scaling relations, for a sample of 38 nearby galaxies (D = 3.4–29 Mpc). Our galaxy sample is drawn primarily from the Spitzer Infrared Nearby Galaxies Survey (SINGS) and contains a wealth of Chandra (5.8 Ms total) and multiwavelength data, allowing for star formation rates (SFRs) and stellar masses (Må) to be measured on subgalactic scales. We divided the 2478 X-ray-detected sources into 21 subsamples in bins of specific SFR (sSFR ≡ SFR/Må) and constructed XLFs. To model the XLF dependence on sSFR, we fit a global XLF model, containing contributions from high-mass XRBs (HMXBs), low-mass XRBs (LMXBs), and background sources from the cosmic X-ray background that respectively scale with SFR, Må, and sky area. We find an HMXB XLF that is more complex in shape than previously reported and an LMXB XLF that likely varies with sSFR, potentially due to an age dependence. When applying our global model to XLF data for each individual galaxy, we discover a few galaxy XLFs that significantly deviate from our model beyond statistical scatter. Most notably, relatively low-metallicity galaxies have an excess of HMXBs above ≈10³⁸ erg s⁻¹ , and elliptical galaxies that have relatively rich populations of globular clusters (GCs) show excesses of LMXBs compared to the global model. Additional modeling of how the XRB XLF depends on stellar age, metallicity, and GC specific frequency is required to sufficiently characterize the XLFs of galaxies.


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    Albin O. Kuhn Library & Gallery
    University of Maryland, Baltimore County
    1000 Hilltop Circle
    Baltimore, MD 21250
    www.umbc.edu/scholarworks

    Contact information:
    Email: scholarworks-group@umbc.edu
    Phone: 410-455-3544


    If you wish to submit a copyright complaint or withdrawal request, please email mdsoar-help@umd.edu.