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- W2000567939 abstract "Using archival Hubble Space Telescope (HST) imaging data, we report the multiband photometric properties of 13 ultraluminous X-ray sources (ULXs) that have a unique compact optical counterpart. Both magnitude and color variation are detected at time scales of days to years. The optical color, variability, and X-ray to optical flux ratio indicate that the optical emission of most ULXs is dominated by X-ray reprocessing on the disk, similar to that of low mass X-ray binaries. For most sources, the optical spectrum is a power-law, $F_{nu} propto nu^{alpha}$ with $alpha$ in the range 1.0 to 2.0 and the optically emitting region has a size on the order of 1e12 cm. Exceptions are NGC 2403 X-1 and M83 IXO 82, which show optical spectra consistent with direct emission from a standard thin disk, M101 ULX-1 and M81 ULS1, which have X-ray to optical flux ratios more similar to high-mass X-ray binaries, and IC 342 X-1, in which the optical light may be dominated by the companion star. Inconsistent extinction between the optical counterpart of NGC 5204 X-1 and the nearby optical nebulae suggests that they may be unrelated." @default.
- W2000567939 created "2016-06-24" @default.
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- W2000567939 date "2011-08-08" @default.
- W2000567939 modified "2023-10-13" @default.
- W2000567939 title "COMPACT OPTICAL COUNTERPARTS OF ULTRALUMINOUS X-RAY SOURCES" @default.
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- W2000567939 doi "https://doi.org/10.1088/0004-637x/737/2/81" @default.
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