DISCOVERY OF X-RAY EMISSION FROM AND DISTANCE TO THE SUPERNOVA REMNANT G84.2-0.8

We analyze X-ray and radio observations of the supernova remnant G84.2-0.8. 1420 MHz atomic hydrogen (HI) line and radio continuum data yield HI absorption spectra and a new HI absorption distance of 5.8-6.2 kpc. Archival X-ray observations from ROSAT and Chandra which cover the area including G84.2...

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Bibliographic Details
Published in:The Astrophysical journal 2012-11, Vol.760 (1), p.1-6
Main Authors: LEAHY, Denis A, GREEN, Kaylie S
Format: Article
Language:English
Subjects:
ABSORPTION SPECTRA
Astronomy
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Atomic absorption analysis
Continuums
COSMIC X-RAY SOURCES
DENSITY
DISTANCE
Earth, ocean, space
Emission
Exact sciences and technology
Explosions
GAMMA ASTRONOMY
HYDROGEN
Interstellar matter
INTERSTELLAR SPACE
MHZ RANGE
PHOTON EMISSION
RADIOASTRONOMY
Spectra
SUPERNOVA REMNANTS
X RADIATION
X-RAY SPECTRA
X-rays
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Summary:We analyze X-ray and radio observations of the supernova remnant G84.2-0.8. 1420 MHz atomic hydrogen (HI) line and radio continuum data yield HI absorption spectra and a new HI absorption distance of 5.8-6.2 kpc. Archival X-ray observations from ROSAT and Chandra which cover the area including G84.2-0.8 are analyzed to show extended X-ray emission from G84.2-0.8. Fits to X-ray spectra from Chandra, with the new HI distance of 5.8-6.2 kpc, are used to determine the Sedov parameters of the supernova remnant. G84.2-0.8 is large (16-18 pc radius), middle aged (~9000 yr), expanding in low-density interstellar medium (0.02 cm super(-3)), and consistent with a low explosion energy (0.8-6.5 x 10 super(50) erg).
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/760/1/25