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Title:
The isolated neutron star X-ray pulsars RX J0420.0-5022 and RX J0806.4-4123: New X-ray and optical observations
Authors:
Haberl, F.; Motch, C.; Zavlin, V. E.; Reinsch, K.; Gänsicke, B. T.; Cropper, M.; Schwope, A. D.; Turolla, R.; Zane, S.
Affiliation:
AA(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, 85748 Garching, Germany ), AB(Observatoire Astronomique, CNRS UMR 7550, 11 rue de l'Université, 67000 Strasbourg, France), AC(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, 85748 Garching, Germany; Observatoire Astronomique, CNRS UMR 7550, 11 rue de l'Université, 67000 Strasbourg, France), AD(Universitäts-Sternwarte, Geismarlandstr. 11, 37083 Göttingen, Germany), AE(Department of Physics, University of Warwick, Coventry CV4 7AL, UK), AF(Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK), AG(Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany), AH(Dipartimento di Fisica, Universitá di Padova, via Marzolo 8, 35131 Padova, Italy), AI(Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK)
Publication:
Astronomy and Astrophysics, v.424, p.635-645 (2004) (A&A Homepage)
Publication Date:
09/2004
Origin:
A&A
A&A Keywords:
X-rays: stars, stars: neutron, stars: magnetic fields, stars: individual: RX J0420.0-5022, RX J0806.4-4123
DOI:
10.1051/0004-6361:20040440
Bibliographic Code:
2004A&A...424..635H

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 NH = 4\hcm{19} 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 NH = 1.0\hcm{20}. 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.

Based on observations with XMM-Newton, an ESA Science Mission with instruments and contributions directly funded by ESA Member states and the USA (NASA). Optical observations were performed at the European Southern Observatory, ESO programme 66.D-0128(A).

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