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The isolated neutron star X-ray pulsars RX J0420.0–5022 and RX J0806.4–4123 : new X-ray and optical observations

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Haberl, F., Motch, C., Zavlin, V. E., Reinsch, K. (Klaus), Gaensicke, B. T. (Boris T.), Cropper, Mark, Schwope, A. D. (Axel D.), Turolla, R. and Zane, S.. (2004) The isolated neutron star X-ray pulsars RX J0420.0–5022 and RX J0806.4–4123 : new X-ray and optical observations. Astronomy & Astrophysics, Vol.424 (No.2). pp. 635-645. ISSN 0004-6361

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Abstract

We report on the analysis of new X-ray data obtained with XMM-Newton and Chandra from two ROSAT-discovered X-ray dim isolated neutron stars (XDINs). RX J0806.4−4123 was observed with XMM-Newton in April 2003, 2.5 years after
the first observation. The EPIC-pn data confirm that this object is an X-ray pulsar with 11.371 s neutron star spin period. The X-ray spectrum is consistent with absorbed black-body emission with a temperature kT = 96 eV and N H = 4 × 10 19 cm −2 without significant changes between the two observations. Four XMM-Newton observations of RX
J0420.0−5022 between December 2002 and July 2003 did not confirm the 22.7 s pulsations originally indicated in ROSAT data, but clearly reveal a 3.453 s period. A fit to the X-ray spectrum using an absorbed black-body model yields kT = 45 eV, the lowest value found from the small group of XDINs and N H = 1.0 × 10 20 cm −2. Including a broad absorption line improves the quality of the spectral fits considerably for both objects and may indicate the presence of absorption features similar to those reported from RBS1223, RX J1605.3+3249 and RX J0720.4−3125. For both targets we derive accurate X-ray positions from the Chandra data and present an optical counterpart candidate for RX J0420.0−5022 with B = 26.6 ± 0.3 mag from VLT imaging.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Neutron stars, X-ray sources, Galactic, Stars -- Magnetic fields, Pulsars
Journal or Publication Title: Astronomy & Astrophysics
Publisher: EDP Sciences
ISSN: 0004-6361
Official Date: September 2004
Volume: Vol.424
Number: No.2
Page Range: pp. 635-645
Identification Number: 10.1051/0004-6361:20040440
Status: Peer Reviewed
Access rights to Published version: Open Access
Funder: Germany. Bundesministerium für Bildung und Forschung (BMBF), Deutsche Forschungsanstalt für Luft- und Raumfahrt (DLR), Max-Planck-Gesellschaft zur Förderung der Wissenschaften [Max Planck Society for the Advancement of Science], Heidenhain-Stiftung
References:

Aldcroft, T. L., Karovska, M., Cresitello-Dittmar, M. L., Cameron,
R. A., & Markevitch, M. L. 2000, in Proc. SPIE, X-ray Optics,
Instruments, and Missions III, ed. J. E. Trümper, & B. Aschenbach,
4012, 650
Aschenbach, B., Briel, U. G., Haberl, F., et al. 2000, in Proc. SPIE,
X-ray Optics, Instruments, and Missions III, ed. J. E. Trümper, &
B. Aschenbach, 4012, 731
Biggs, J. D. 1990, MNRAS, 245, 514
Bignami, G. F., Caraveo, P. A., Luca, A. D., & Mereghetti, S. 2003,
Nature, 423, 725
Buccheri, R., Bennett, K., Bignami, G. F., et al. 1983, A&A, 128, 245
Burwitz, V., Haberl, F., Neuhäuser, R., et al. 2003, A&A, 399, 1109
Cropper, M., Zane, S., Ramsay, G., Haberl, F., & Motch, C. 2001,
A&A, 365, L302
Cropper, M., Haberl, F., Zane, S.,& Zavlin, V. E. 2004, MNRAS, 351,
1099
De Luca, A., Mereghetti, S., Caraveo, P. A., et al. 2004, A&A, 418,
625
de Vries, C. P., Vink, J., Méndez, M., & Verbunt, F. 2004, A&A, 415,
L31
den Herder, J. W., Brinkman, A. C., Kahn, S. M., et al. 2001, A&A,
365, L7
Gänsicke, B. T., Braje, T. M., & Romani, R.W. 2002, A&A, 386, 1001
Gregory, P. C., & Loredo, T. J. 1996, ApJ, 473, 1059
Haberl, F. 2004, Adv. Space Res., 33, 638
Haberl, F., & Zavlin, V. E. 2002, A&A, 391, 571
Haberl, F., Motch, C., Buckley, D. A. H., Zickgraf, F. J., & Pietsch,
W. 1997, A&A, 326, 662
Haberl, F., Motch, C., & Pietsch, W. 1998, Astron. Nachr., 319, 97
Haberl, F., Pietsch, W., & Motch, C. 1999, A&A, 351, L53
Haberl, F., Schwope, A. D., Hambaryan, V., Hasinger, G., & Motch,
C. 2003, A&A, 403, L19
Haberl, F., Zavlin, V. E., Trümper, J., & Burwitz, V. 2004, A&A, 419,
1077
Hailey, C. J., & Mori, K. 2002, ApJ, 578, L133
Ho,W. C. G., Lai, D., Potekhin, A. Y., & Chabrier, G. 2003, ApJ, 599,
1293
Jansen, F., Lumb, D., Altieri, B., et al. 2001, A&A, 365, L1
Kaplan, D. L., Kulkarni, S. R.,& van Kerkwijk,M. H. 2002, ApJ, 579,
L29
Kaplan, D. L., Kulkarni, S. R., & van Kerkwijk, M. H. 2003a, ApJ,
588, L33
Kaplan, D. L., van Kerkwijk,M. H., Marshall, H. L., et al. 2003b, ApJ,
590, 1008
Motch, C. 2001, in X-ray Astronomy, Stellar Endpoints, AGN, and
the Diffuse X-ray Background, AIP Conf. Proc., 244
Paerels, F., Mori, K., Motch, C., et al. 2001, A&A, 365, L298
Page, D. 1995, ApJ, 442, 273
Page, D., & Sarmiento, A. 1996, ApJ, 473, 1067
Pavlov, G. G., Zavlin, V. E., Trümper, J., & Neuhäuser, R. 1996, ApJ,
472, L33
Strüder, L., Briel, U., Dennerl, K., et al. 2001, A&A, 365, L18
Treves, A., Turolla, R., Zane, S., & Colpi, M. 2000, PASP, 112, 297
Turner, M. J. L., Abbey, A., Arnaud, M., et al. 2001, A&A, 365, L27
Turolla, R., Zane, S., & Drake, J. J. 2004, ApJ, 603, 265
van Kerkwijk, M. H., Kaplan, D. L., Durant, M., Kulkarni, S., &
Paerels, F. 2004, ApJ, 608, 432
Walter, F. M., & Matthews, L. D. 1997, Nature, 389, 358
Zane, S., Turolla, R., & Drake, J. J. 2004, Adv. Space Res., 33, 531
Zavlin, V. E., & Pavlov, G. G. 1998, A&A, 329, 583
Zavlin, V. E., & Pavlov, G. G. 2002, in Neutron Stars, Pulsars, and
Supernova Remnants, ed. W. Becker, H. Lesch, & J. Trümper,
MPE-Report, 278, 263
Zavlin, V. E., Pavlov, G. G., & Sanwal, D. 2004, ApJ, 606, 444
URI: http://wrap.warwick.ac.uk/id/eprint/3595

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