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Title:
An X-ray study of five supernova remnants in the Carina spiral arm
Authors:
Hwang, Una; Markert, Thomas H.
Affiliation:
AA(MIT, Cambridge, MA, US), AB(MIT, Cambridge, MA, US)
Publication:
The Astrophysical Journal, vol. 431, no. 2, pt. 1, p. 819-825 (ApJ Homepage)
Publication Date:
08/1994
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
INTERSTELLAR MATTER, PLASMA DENSITY, RADIO EMISSION, STELLAR MASS, SUPERNOVA REMNANTS, THERMAL PLASMAS, X RAY SPECTRA, COSMOLOGY, NEBULAE, PLASMA TEMPERATURE, PROPORTIONAL COUNTERS, RADIO SPECTRA, SPECTRUM ANALYSIS
DOI:
10.1086/174532
Bibliographic Code:
1994ApJ...431..819H

Abstract

The ROSAT Position Sensitive Proportional Counter (PSPC) is used to perform an exploratory study of four fields in the Carina spiral arm containing five radio supernova remnants, only one of which has previously been studied in X-rays. We present upper limits for the detection in X-rays of G298.5 - 0.3, G298.6 - 0.0, and G299.0+0.2, and report a 4 sigma detection of G296.8-0.3. In addition, we present detailed spatial and spectral analysis of the bright X-ray remnant G296.1-0.7, which has previously been studied by both the Einstein IPC and EXOSAT LE/CMA. We detect relatively slight, but statistically significant, variations in the spectrum across the remnant via spatially resolved spectral fits and a study of the spatial variation of hardness ratios. In general, the spectrum is characteristic of a thermal plasma with kT about 0.2 keV and NH about 1.5 x 1021/sq. cm. The total X-ray emitting mass is estimated to be about 250 solar mass for an optically estimated distance of 4 kpc to the remnant. At this distance, the linear dimensions of the remnant are roughly 35 - 50 pc, implying an age on the order of 20,000 yr. Assuming that X-ray and radio brightnesses are related by SIGMAR proportional to SIGMA0.69X and that the four radio remnants have X-ray spectral characteristics similar to G296.1-0.7, we find that the column densities to these sources must be several times 1022/sq cm in order to explain their low X-ray count rates. This column density is considerably in excess of the X-ray fitted column density to G296.1-0.7, but is comparable to the total column densities in H I measured via the 21 cm line in the directions to all five remnants. This implies that G296.1 - 0.7 is at a significantly smaller distance than the other remnants.

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