A VARIABLE NEAR-INFRARED COUNTERPART TO THE NEUTRON-STAR LOW-MASS X-RAY BINARY 4U 1705 – 440
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...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | en_US |
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Institute of Physics/American Astronomical Society
2015
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| Online Access: | http://hdl.handle.net/1721.1/96196 |
| _version_ | 1811075106412167168 |
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| author | Homan, Jeroen Kaplan, David L. van den Berg, Maureen Young, Andrew J. |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Homan, Jeroen Kaplan, David L. van den Berg, Maureen Young, Andrew J. |
| author_sort | Homan, Jeroen |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T10:00:55Z |
| format | Article |
| id | mit-1721.1/96196 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:00:55Z |
| publishDate | 2015 |
| publisher | Institute of Physics/American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/961962022-09-26T15:08:23Z A VARIABLE NEAR-INFRARED COUNTERPART TO THE NEUTRON-STAR LOW-MASS X-RAY BINARY 4U 1705 – 440 Homan, Jeroen Kaplan, David L. van den Berg, Maureen Young, Andrew J. MIT Kavli Institute for Astrophysics and Space Research Homan, Jeroen Kaplan, David L. 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. United States. National Aeronautics and Space Administration (Hubble Fellowship grant #01207.01-A, Space Telescope Science Institute) 2015-03-26T14:23:21Z 2015-03-26T14:23:21Z 2009-02 2008-04 Article http://purl.org/eprint/type/JournalArticle 0004-637X 1538-4357 http://hdl.handle.net/1721.1/96196 Homan, Jeroen, David L. Kaplan, Maureen van den Berg, and Andrew J. Young. “A VARIABLE NEAR-INFRARED COUNTERPART TO THE NEUTRON-STAR LOW-MASS X-RAY BINARY 4U 1705 – 440.” The Astrophysical Journal 692, no. 1 (February 10, 2009): 73–80. © 2009 American Astronomical Society. en_US http://dx.doi.org/10.1088/0004-637x/692/1/73 Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf Institute of Physics/American Astronomical Society American Astronomical Society |
| spellingShingle | Homan, Jeroen Kaplan, David L. van den Berg, Maureen Young, Andrew J. A VARIABLE NEAR-INFRARED COUNTERPART TO THE NEUTRON-STAR LOW-MASS X-RAY BINARY 4U 1705 – 440 |
| title | A VARIABLE NEAR-INFRARED COUNTERPART TO THE NEUTRON-STAR LOW-MASS X-RAY BINARY 4U 1705 – 440 |
| title_full | A VARIABLE NEAR-INFRARED COUNTERPART TO THE NEUTRON-STAR LOW-MASS X-RAY BINARY 4U 1705 – 440 |
| title_fullStr | A VARIABLE NEAR-INFRARED COUNTERPART TO THE NEUTRON-STAR LOW-MASS X-RAY BINARY 4U 1705 – 440 |
| title_full_unstemmed | A VARIABLE NEAR-INFRARED COUNTERPART TO THE NEUTRON-STAR LOW-MASS X-RAY BINARY 4U 1705 – 440 |
| title_short | A VARIABLE NEAR-INFRARED COUNTERPART TO THE NEUTRON-STAR LOW-MASS X-RAY BINARY 4U 1705 – 440 |
| title_sort | variable near infrared counterpart to the neutron star low mass x ray binary 4u 1705 440 |
| url | http://hdl.handle.net/1721.1/96196 |
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