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Title:
An X-Ray Study of the Supernova Remnant G290.1-0.8
Authors:
Slane, Patrick; Smith, Randall K.; Hughes, John P.; Petre, Robert
Affiliation:
AA(; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AB(; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AC(; Department of Physics and Astronomy, Rutgers, The State University of New Jersey, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019.), AD(; NASA/GSFC.)
Publication:
The Astrophysical Journal, Volume 564, Issue 1, pp. 284-290. (ApJ Homepage)
Publication Date:
01/2002
Origin:
UCP
ApJ Keywords:
ISM: individual (G290.1-0.8, MSH 11-61A), ISM: Supernova Remnants, X-Rays: ISM
DOI:
10.1086/324155
Bibliographic Code:
2002ApJ...564..284S

Abstract

G290.1-0.8 (MSH 11-61A) is a supernova remnant (SNR) whose X-ray morphology is centrally bright. However, unlike the class of X-ray composite SNRs whose centers are dominated by nonthermal emission presumably driven by a central pulsar, we show that the X-ray emission from G290.1-0.8 is thermal in nature, placing the remnant in an emerging class which includes such remnants as W44, W28, 3C391, and others. The evolutionary sequence which leads to such X-ray properties is not well understood. Here we investigate two scenarios for such emission: evolution in a cloudy interstellar medium, and early-stage evolution of a remnant into the radiative phase, including the effects of thermal conduction. We construct models for these scenarios in an attempt to reproduce the observed center-filled X-ray properties of G290.1-0.8, and we derive the associated age, energy, and ambient density conditions implied by the models. We find that for reasonable values of the explosion energy, the remnant age is of order (1-2)×104 yr. This places a fairly strong constraint on any association between G290.1-0.8 and PSR J1105-610, which would require an anomalously large velocity for the pulsar.
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