352 citations · 5.2k across the 127 of their papers we have counts for
30 papers · 1 filter
Do Ultraluminous X-Ray Sources Exist in Dwarf Galaxies?
Douglas A. Swartz, Roberto Soria, Allyn F. Tennant
A thorough search for Ultraluminous X-ray source candidates within the Local Volume is made. The search spatially matches potential ULXs detected in X-ray images or cataloged in th…
Optical Spectroscopy of the environment of a ULX in NGC 7331
Pavel K. Abolmasov, Douglas A. Swartz, S. Fabrika +3
Optical photometric and spectroscopic data are presented that show an association of an ultraluminous X-ray source in NGC 7331 with a young star cluster of mass 1.1e5 solar masses…
Discovery of a Transient X-ray Source in the Compact Stellar Nucleus of NGC 2403
Mihoko Yukita, Douglas A. Swartz, Roberto Soria +1
We report the discovery of an X-ray source coincident with the nuclear star cluster at the dynamical center of the nearby late-type spiral galaxy NGC 2403. The X-ray luminosity of…
A search for a counterpart of the unidentified gamma-ray source 3EG J2020+4017 (2CG078+2)
Martin C. Weisskopf, Douglas A. Swartz, Alberto Carraminana +7
We report observations with the Chandra X-ray Observatory of a field in the gamma$-Cygni supernova remnant (SNR78.2+2.1) centered on the cataloged location of the unidentified, bri…
Discovery of a 3.6-hr Eclipsing Luminous X-Ray Binary in the Galaxy NGC 4214
Kajal K. Ghosh, Saul Rappaport, Allyn F. Tennant +3
We report the discovery of an eclipsing X-ray binary with a 3.62-hr period within 24" of the center of the dwarf starburst galaxy NGC 4214. The orbital period places interesting co…
On the nature of the ultraluminous X-ray transient in Cen~A (NGC 5128)
Kajal K. Ghosh, Mark H. Finger, Douglas A. Swartz +2
We combine 9 ROSAT, 9 Chandra, and 2 XMM-Newton observations of the Cen~A galaxy to obtain the X-ray light curve of 1RXH J132519.8-430312 (=CXOU J132519.9430317) spanning 1990 t…