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Title:
Discovery of X-Ray Emission from G328.4+0.2, a Crab-like Supernova Remnant
Authors:
Hughes, John P.; Slane, Patrick O.; Plucinsky, Paul P.
Affiliation:
AA(Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019), AB(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138), AC(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138)
Publication:
The Astrophysical Journal, Volume 542, Issue 1, pp. 386-391. (ApJ Homepage)
Publication Date:
10/2000
Origin:
UCP
ApJ Keywords:
ISM: individual (G328.4+0.2, MSH 15-57), Stars: Pulsars: General, ISM: Supernova Remnants, X-Rays: ISM
DOI:
10.1086/309532
Bibliographic Code:
2000ApJ...542..386H

Abstract

G328.4+0.2 is a moderately small (5'×5') Galactic radio supernova remnant (SNR) at a distance of at least 17 kpc that has been long suggested to be Crab-like. Here we report on the detection with ASCA of the X-ray emission from the SNR. The X-ray source is faint with an observed flux of (6.0+/-0.8)×10-13 ergs s-1 cm-2 over the 2-10 keV band. The emission is heavily cut off at low energies and no flux is detected below 2 keV. Spectral analysis confirms that the column density to the source is indeed large, NH~1023 atoms cm-2, and consistent with the total column density of hydrogen through the Galaxy at this position. Good fits to the spectrum can be obtained for either thermal plasma or nonthermal power-law models, although the lack of detected line emission as well as other evidence argues against the former interpretation. The power-law index we find, αP=2.9+0.9-0.8, is consistent with other Crab-like SNRs. In the radio band, G328.4+0.2 is nearly as luminous as the Crab Nebula, yet in the X-ray band, it is some 70 times fainter. Nevertheless, its inferred soft X-ray band luminosity is greater than all but the brightest pulsar-powered synchrotron nebulae and implies that G328.4+0.2 contains a rapidly spinning, as yet undetected, pulsar that is losing energy at a rate of ~1038 ergs s-1.
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