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

Article English OPEN
Haberl, F. ; Motch, C. ; Zavlin, V. E. ; Reinsch, K. (Klaus) ; Gaensicke, B. T. (Boris T.) ; Cropper, Mark ; Schwope, A. D. (Axel D.) ; Turolla, R. ; Zane, S. (2004)

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\ud 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\ud 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.\ud
  • References (30)
    30 references, page 1 of 3

    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

  • Metrics
    0
    views in OpenAIRE
    0
    views in local repository
    54
    downloads in local repository

    The information is available from the following content providers:

    From Number Of Views Number Of Downloads
    Warwick Research Archives Portal Repository - IRUS-UK 0 54
Share - Bookmark