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- W3100150179 abstract "The X-ray emissivity (i.e., luminosity per unit stellar mass) of globular clusters are an important indicator of their dynamical evolution history. Based on deep archival textit{Chandra} observations, we report a stacking analysis of 44 globular clusters (GCs) with 0.5-8 keV luminosities $L_{rm X} lesssim 10^{35} {rm~erg~s^{-1}}$ in the M,31 bulge, which are supposed to be dominated by cataclysmic variables (CVs) and coronally active binaries (ABs). We obtain a significant detection at $5sigma$ level in 0.5-8 keV band. The average X-ray luminosity per GC and the average X-ray emissivity are determined to be $5.3 pm 1.6times10^{33}rm~erg~s^{-1}$ and $13.2pm4.3times10^{27}rm~erg~{rm s^{-1}~M^{-1}_{odot}}$, respectively. Both of these values are consistent with those of MW GCs. What's more, the measured emissivity of M31 GCs is also consistent with that of the MW field stars. Massive GCs have X-ray luminosities which are marginally higher with less massive ones. Massive GCs also show a lower emissivity ($4.5pm 2.4times10^{27}{rm~erg~s^{-1}~M^{-1}_{odot}}$) than less massive ones ($15.0pm 7.8times10^{27}{rm~erg~s^{-1}~M^{-1}_{odot}}$), which is consistent with the scenario that the (progenitors of) CVs and ABs were more efficiently destructed via stellar encounters in the more massive GCs. No dependence of the X-ray emissivity on GC color or on the projected galactocentric distance of GCs were found." @default.
- W3100150179 created "2020-11-23" @default.
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- W3100150179 date "2018-03-27" @default.
- W3100150179 modified "2023-09-23" @default.
- W3100150179 title "A<i>Chandra</i>Study of the Stellar X-Ray Emissivity of Globular Clusters in the M31 Bulge" @default.
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- W3100150179 doi "https://doi.org/10.3847/1538-4357/aab352" @default.
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