Optical Sources Near the Bright X-Ray Source in NGC 1073

Details Optical Sources Near the Bright X-Ray Source in NGC 1073 Optical Sources Near the Bright X-Ray Source in NGC 1073

2005-05-02

arxiv.org/abs/astro-ph/0505031v1

Astrophys.J. 629 (2005) 233-238

Astronomy and Astrophysics

Astrophysics

to appear in ApJ, 12 pages, several color figures

Scientific paper

10.1086/431471

New HST observations show that the bright X-ray source in the face-on spiral galaxy NGC 1073 is located near a ring of recent star formation with an age of 8-16 Myr. This strengthens the association of X-ray sources in spiral galaxies emitting near or above the Eddington limit for a 20 solar mass black hole with recent star formation events. Two candidate optical counterparts of the X-ray source are found. The X-ray to optical flux ratios of both are consistent with those of low-mass X-ray binaries and higher than most high-mass X-ray binaries, suggesting that reprocessing of X-rays contributes to the optical light. The optical magnitude and color of one candidate is consistent with that predicted for an X-ray binary with an initial donor mass of 6-8 solar masses. However, the same X-ray binary evolution model underestimates the X-ray luminosity. An X-ray source list for the field is presented which includes detections of the nucleus of NGC 1073, three quasars, and an M3e brown dwarf star with high proper motion.

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