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The X-ray position and optical counterpart of the accretion-powered millisecond pulsar XTE J1814−338

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Krauss, Miriam I., Wang, Zhongxiang, Dullighan, Allyn, Juett, Adrienne M., Kaplan, David L., Chakrabarty, Deepto, van Kerkwijk, Marten H., Steeghs, D., Jonker, P. G. and Markwardt, C. B.. (2005) The X-ray position and optical counterpart of the accretion-powered millisecond pulsar XTE J1814−338. The Astrophysical Journal, Vol.627 (No.2). pp. 910-914. ISSN 0004-637X

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Official URL: http://dx.doi.org/10.1086/430595

Abstract

We report the precise optical and X-ray localization of the 3.2 ms accretion-powered X-ray pulsar XTE J1814-338 with data from the Chandra X-Ray Observatory as well as optical observations conducted during the 2003 June discovery outburst. Optical imaging of the field during the outburst of this soft X-ray transient reveals an R = 18 star at the X-ray position. This star is absent (R > 20) from an archival 1989 image of the field and brightened during the 2003 outburst, and we therefore identify it as the optical counterpart of XTE J1814-338. The best source position derived from optical astrometry is R.A. = 18h13m39.s04, decl. = -33°46'223 (J2000). The featureless X-ray spectrum of the pulsar in outburst is best fit by an absorbed power law (with photon index γ = 1.41 ± 0.06) plus blackbody (with kT = 0.95 ± 0.13 keV) model, where the blackbody component contributes approximately 10% of the source flux. The optical broadband spectrum shows evidence for an excess of infrared emission with respect to an X-ray heated accretion disk model, suggesting a significant contribution from the secondary or from a synchrotron-emitting region. A follow-up observation performed when XTE J1814-338 was in quiescence reveals no counterpart to a limiting magnitude of R = 23.3. This suggests that the secondary is an M3 V or later-type star and therefore very unlikely to be responsible for the soft excess, making synchrotron emission a more reasonable candidate.

Item Type:

Journal Article

Subjects:

Q Science > QB Astronomy

Divisions:

Faculty of Science > Physics

Library of Congress Subject Headings (LCSH):

Pulsars, X-ray binaries

Journal or Publication Title:

The Astrophysical Journal

Publisher:

Institute of Physics Publishing, Inc.

ISSN:

0004-637X

Official Date:

2005

Dates:

Date	Event
2005	Published

Volume:

Vol.627

Number:

No.2

Page Range:

pp. 910-914

Identification Number:

10.1086/430595

Status:

Peer Reviewed

Publication Status:

Published

Access rights to Published version:

Open Access

Funder:

Smithsonian Astrophysical Observatory, United States. National Aeronautics and Space Administration (NASA)

Grant number:

PF3–40027 (NASA), NAS 8-01129 (NASA)

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