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        Transient Low-mass X-ray Binary Populations in Elliptical Galaxies NGC 3379 and NGC 4278

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        904648.pdf (PDF, 226Kb)
        Author
        Fragos, T.
        Kalogera, V.
        Willems, B.
        Belczynski, K.
        Fabbiano, G.
        Kim, D.-W.
        Brassington, Nicola
        Angelini, L.
        Davies, R. L.
        Gallagher, J.S.
        King, A.R.
        Pellegrini, S.
        Trinchieri, G.
        Zepf, S.E.
        Zezas, A.
        Attention
        2299/8153
        Abstract
        We propose a physically motivated and self-consistent prescription for the modeling of transient neutron star low-mass X-ray binary (LMXB) properties, such as duty cycle (DC), outburst duration, and recurrence time. We apply this prescription to the population synthesis models of field LMXBs presented by Fragos et al., and compare the transient LMXB population to the Chandra X-ray survey of the two elliptical galaxies NGC 3379 and NGC 4278, which revealed several transient sources. We are able to exclude models with a constant DC for all transient systems, while models with a variable DC based on the properties of each system are consistent with the observed transient populations. We predict that the majority of the observed transient sources in these two galaxies are LMXBs with red giant donors. Finally, our comparison suggests that transient LMXBs are very rare in globular clusters (GCs), and thus the number of identified transient LMXBs may be used as a tracer of the relative contribution of field and GC LMXB populations.
        Publication date
        2009-09-01
        Published in
        Astrophysical Journal Letters
        Published version
        https://doi.org/10.1088/0004-637X/702/2/L143
        Other links
        http://hdl.handle.net/2299/8153
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