期刊
ASTROPHYSICAL JOURNAL
卷 862, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/aacb2b
关键词
galaxies: individual (NGC 4472); galaxies: star clusters: individual (RZ 2109); globular clusters: general; X-rays: binaries; X-rays: galaxies: clusters
资金
- Chandra grant [GO4-15089A]
- NASA ADAP grant [NNX15AI71G]
- ESA Member States
- NASA
- NASA [NNX15AI71G, 806016] Funding Source: Federal RePORTER
We present the results of long-term monitoring of the X-ray emission from the ultraluminous X-ray source XMMU J122939.9+075333 in the extragalactic globular cluster RZ2109. The combination of the high X-ray luminosity, short-term X-ray variability, X-ray spectrum, and optical emission suggests that this system is likely an accreting black hole in a globular cluster. To study the long-term behavior of the X-ray emission from this source, we analyze both new and archival Chandra and XIVIM-Newton observations, covering 16 years from 2000 to 2016. For all of these observations, we fit extracted spectra of RZ2109 with XSPEC models. The spectra are all dominated by a soft component, which is very soft with typical fit temperatures of T similar or equal to 0.15 keV. The resulting X-ray fluxes show strong variability on short and long timescales. We also find that the X-ray spectrum often shows no significant change even with luminosity changes as large as a factor of five.
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