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Swift XRT Observations of the Possible Dark Galaxy VIRGOHI 21
Massimiliano Bonamente, Douglas Swartz, Martin Weisskopf +1
\swift \xrt observations of the \hi line source \VV were performed on April 22 and April 26, 2008 for a total exposure time of 9.2ks. This is the first pointed X-ray observation of…
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…
X-ray Fluorescent Fe Kalpha Lines from Stellar Photospheres
Jeremy J. Drake, Barbara Ercolano, Douglas A. Swartz
X-ray spectra from stellar coronae are reprocessed by the underlying photosphere through scattering and photoionization events. While reprocessed X-ray spectra reaching a distant o…
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…