Issue |
A&A
Volume 431, Number 2, February IV 2005
|
|
---|---|---|
Page(s) | L9 - L12 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361:200400136 | |
Published online | 04 February 2005 |
Letter to the Editor
G337.2+0.1: A new X-ray supernova remnant?
1
Departamento de Física (EPS), Universidad de Jaén, Campus Las Lagunillas s/n, 23071 Jaén, Spain e-mail: jcombi@ujaen.es
2
Instituto Argentino de Radioastronomía, C.C.5, (1894) Villa Elisa, Buenos Aires, Argentina
3
Facultad de Ciencias Astronómicas y Geofísicas UNLP, Paseo del Bosque, B1900FWA La Plata, Argentina
4
Stanford Linear Accelerator Center, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
Received:
9
December
2004
Accepted:
23
December
2004
We present evidence supporting a SNR origin for the
radio source G337.2+0.1, which was discovered along the
line of sight to the Norma spiral arm in the MOST 843-MHz radio
survey. The radio source is spatially superposed to the
unidentified ASCA source AX J1635.9-4719. An
analysis of this latter source reveals that its X-ray spectrum,
extended nature, and non-variable flux are consistent with what is
expected for a SNR. In addition, we have used HI-line observations
of the region to look for any effect of the presumed remnant on
the ISM. We have found a well-defined minimum centered at the
position of the radio source in the velocity range of ~
to -19 km s-1. This feature appears as a sharp absorption
dip in the spectrum that might be produced when the continuum
emission from the SNR candidate is absorbed by foreground gas.
Hence we have used it to constrain the distance to the source,
which seems to be a young (age ~ a few 103 yr) and distant
(
kpc) SNR.
G337.2+0.1 and
AX J1635.9-4719 would be the radio/X-ray manifestations
of this remnant.
Key words: X-ray: individuals: AX J1635.9-4719 / radio continuum: ISM / ISM: supernova remnants / ISM: cosmic rays / X-rays: ISM / radiative mechanism: non-thermal
© ESO, 2005
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