The Optical Counterpart of M101 ULX-1

Details The Optical Counterpart of M101 ULX-1 The Optical Counterpart of M101 ULX-1

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...620l..31k&link_type=abstract

The Astrophysical Journal, Volume 620, Issue 1, pp. L31-L34.

Astronomy and Astrophysics

Astronomy

36

X-Rays: Binaries, X-Rays: Individual: Alphanumeric: M101 Ulx-1

Scientific paper

We have identified the optical counterpart of the ultraluminous X-ray source M101 ULX-1 (CXOKM101 J140332.37+542102), by comparing Hubble Space Telescope Advanced Camera for Surveys images with Chandra ACIS-S images. The optical counterpart has V=23.75 and colors consistent with those for a mid-B supergiant. Archival Wide Field Planetary Camera 2 observations show that the source brightness is constant to within ~0.1 mag. The physical association of this source with the ULX is confirmed by Gemini Multi-Object Spectrograph observations that show spatially unresolved He II λ4686 and He I λ5876 emission. These results suggest that M101 ULX-1 is a high-mass X-ray binary, but deep spectroscopic monitoring observations are needed to determine the detailed properties of this system.

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