SIMBAD references

2004A&A...424..635H - Astronomy and Astrophysics, volume 424, 635-645 (2004/9-3)

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

HABERL F., MOTCH C., ZAVLIN V.E., REINSCH K., GAENSICKE B.T., CROPPER M., SCHWOPE A.D., TUROLLA R. and ZANE S.

Abstract (from CDS):

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 11.371s neutron star spin period. The X-ray spectrum is consistent with absorbed black-body emission with a temperature kT=96eV and NH=4x1019cm–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 22.7s pulsations originally indicated in ROSAT data, but clearly reveal a 3.453s period. A fit to the X-ray spectrum using an absorbed black-body model yields kT=45eV, the lowest value found from the small group of XDINs and NH=1.0x1020cm–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±0.3mag from VLT imaging.

Abstract Copyright:

Journal keyword(s): X-rays: stars - stars: neutron - stars: magnetic fields - stars: individual: RX J0420.0-5022, RX J0806.4-4123

Nomenclature: Fig.7, Table 6: [HPM99] A (No. I) added.

Simbad objects: 14

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2021.06.13-03:57:08

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