SIMBAD references

2000ApJ...542..386H - Astrophys. J., 542, 386-391 (2000/October-2)

Discovery of X-ray emission from G328.4+0.2, a crab-like supernova remnant.


Abstract (from CDS):

G328.4+0.2 is a moderately small (5'x5') 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)x10–13 ergs.s––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∼1023–2, 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.

Abstract Copyright:

Journal keyword(s): ISM: individual (G328.4+0.2, MSH 15-57) - Stars: Pulsars: General - ISM: Supernova Remnants - X-Rays: ISM

Simbad objects: 15

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