TY - JOUR
T1 - X-Ray Variability from the Ultraluminous Black Hole Candidate X-Ray Binary in the Globular Cluster RZ 2109
AU - Dage, Kristen C.
AU - Zepf, Stephen E.
AU - Bahramian, Arash
AU - Kundu, Arunav
AU - Maccarone, Thomas J.
AU - Peacock, Mark B.
N1 - Funding Information:
K.C.D., S.E.Z., and M.B.P. acknowledge support from Chandra grant GO4-15089A. S.E.Z. and M.B.P. also acknowledge support from the NASA ADAP grant NNX15AI71G. This research has made use of data obtained from the Chandra Data Archive and the Chandra Source Catalog, and is based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA. We also acknowledge use of NASA’s Astrophysics Data System and Arxiv.
Publisher Copyright:
© 2018. The American Astronomical Society. All rights reserved.
PY - 2018/8/1
Y1 - 2018/8/1
N2 - 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 XMM-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 ≃ 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.
AB - 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 XMM-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 ≃ 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.
KW - X-rays: binaries
KW - X-rays: galaxies: clusters
KW - galaxies: individual (NGC 4472)
KW - galaxies: star clusters: individual (RZ 2109)
KW - globular clusters: general
UR - http://www.scopus.com/inward/record.url?scp=85051537922&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/aacb2b
DO - 10.3847/1538-4357/aacb2b
M3 - Article
AN - SCOPUS:85051537922
VL - 862
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 108
ER -