Lost and Found: A New Position and Infrared Counterpart for the X-Ray Binary Scutum X-1
Abstract
Using archival X-ray data, we find that the catalog location of the X-ray binary Scutum X-1 (Sct X-1) is incorrect and that the correct location is that of the X-ray source AX J183528-0737, which is 15' to the west. Our identification is made on the basis of the 112 s pulse period for this object detected in an XMM-Newton observation, as well as spatial coincidence between AX J183528-0737 and previous X-ray observations. Based on the XMM-Newton data and archival RXTE data, we confirm secular spin-down over 17 yr with period derivative P ≈ 3.9 × 10^(-9) s s^(-1), but do not detect a previously reported X-ray iron fluorescence line. We identify a bright (K_s = 6.55) red (J - K_s = 5.51) optical and infrared counterpart to AX J183528-0737 from 2MASS, a number of mid-IR surveys, and deep optical observations, which we use to constrain the extinction to and distance of Sct X-1. From these data, as well as limited near-IR spectroscopy, we conclude that Sct X-1 is most likely a binary system composed of a late-type giant or supergiant and a neutron star.
Additional Information
© 2007 The American Astronomical Society. Received 2006 December 21; accepted 2007 February 5. We thank A. Burgasser for conducting the Magellan observations and helpful discussion and C. Steidel for assistance with the near-IR spectroscopy. The Digitized Sky Surveys were produced at the Space Telescope Science Institute under US government grant NAG W-2166. The images of these surveys are based on photographic data obtained using the Oschin Schmidt Telescope on Palomar Mountain and the UK Schmidt Telescope. The plates were processed into the present compressed digital form with the permission of these institutions. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center, California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This research made use of data products from the Midcourse Space Experiment. Processing of the data was funded by the Ballistic Missile Defense Organization, with additional support from NASA Office of Space Science. This research has also made use of the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. The DENIS project has been partly funded by the SCIENCE and the HCM plans of the European Commission under grants CT920791 and CT940627. It is supported by INSU, MEN, and CNRS in France, by the State of Baden-Wurttemberg in Germany, by DGICYT in Spain, by CNR in Italy, by FFwFBWF in Austria, by FAPESP in Brazil, by OTKA grants F-4239 and F-013990 in Hungary, and by the ESO C&EE grant A-04-046. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. This research has made use of data obtained from the High Energy Astrophysics Science Archive Research Center (HEASARC), provided by NASA's Goddard Space Flight Center. This research hasmade use of SAOImageDS9, developed by the Smithsonian Astrophysical Observatory. Finally, we wish to extend special thanks to those of Hawaiian ancestry on whose sacred mountain we are privileged to be guests. Without their generous hospitality, some of the observations presented herein would not have been possible. Facilities: Magellan:Baade (MagIC), XMM (EPIC), RXTE (PCA).Attached Files
Published - KAPapj07.pdf
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Additional details
- Eprint ID
- 17405
- Resolver ID
- CaltechAUTHORS:20100205-142240974
- NAG W-2166
- NASA
- Ballistic Missile Defense Organization
- Space Telescope Science Institute
- CT920791
- European Commission
- CT940627
- European Commission
- Created
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2010-02-09Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field