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Is RX J1856.5−3754 a Quark Star?

Authors :
Fabrizio Nicastro
Herman L. Marshall
Antonella Fruscione
Jeremy J. Drake
Deron O. Pease
Vinay L. Kashyap
Klaus Werner
Michael Juda
Brad Wargelin
Stefan Dreizler
Peter E. Freeman
Source :
The Astrophysical Journal. 572:996-1001
Publication Year :
2002
Publisher :
American Astronomical Society, 2002.

Abstract

Deep Chandra LETG+HRC-S observations of the isolated neutron star candidate RX J1856.5-3754 have been analysed to search for metallic and resonance cyclotron spectral features and for pulsation behaviour. As found from earlier observations, the X-ray spectrum is well-represented by a ~ 60 eV (7e5 K) blackbody. No unequivocal evidence of spectral line or edge features has been found, arguing against metal-dominated models. The data contain no evidence for pulsation and we place a 99% confidence upper limit of 2.7% on the unaccelerated pulse fraction over a wide frequency range from 1e-4 to 100 Hz. We argue that the derived interstellar medium neutral hydrogen column density of 8e19

Details

ISSN :
15384357 and 0004637X
Volume :
572
Database :
OpenAIRE
Journal :
The Astrophysical Journal
Accession number :
edsair.doi...........195583a7242c64c2fdd1af739ee20176