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96196 |
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|a Homan, Jeroen
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|a MIT Kavli Institute for Astrophysics and Space Research
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|a Homan, Jeroen
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|a Kaplan, David L.
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|a Kaplan, David L.
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|a van den Berg, Maureen
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|a Young, Andrew J.
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|a A VARIABLE NEAR-INFRARED COUNTERPART TO THE NEUTRON-STAR LOW-MASS X-RAY BINARY 4U 1705 - 440
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|b Institute of Physics/American Astronomical Society,
|c 2015-03-26T14:23:21Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/96196
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|a We report the discovery of a near-infrared (NIR) counterpart to the persistent neutron-star low-mass X-ray binary 4U 1705 - 440, at a location consistent with its recently determined Chandra X-ray position. The NIR source is highly variable, with Ks -band magnitudes varying between 15.2 and 17.3 and additional J- and H-band observations revealing color variations. A comparison with contemporaneous X-ray monitoring observations shows that the NIR brightness correlates well with X-ray flux and X-ray spectral state. We also find possible indications of a change in the slope of the NIR/X-ray flux relation among different X-ray states. We discuss and test various proposed mechanisms for the NIR emission from neutron-star low-mass X-ray binaries and conclude that the NIR emission in 4U 1705 - 440 is most likely dominated by X-ray heating of the outer accretion disk and the secondary star.
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|a United States. National Aeronautics and Space Administration (Hubble Fellowship grant #01207.01-A, Space Telescope Science Institute)
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|a Article
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|t Astrophysical Journal
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