Issue |
A&A
Volume 459, Number 2, November IV 2006
|
|
---|---|---|
Page(s) | 535 - 544 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20065061 | |
Published online | 12 September 2006 |
New VLA observations of the SNR Puppis A: the radio properties and the correlation with the X-ray emission
1
Instituto de Astronomía y Física del Espacio (IAFE), CC 67, Suc. 28, 1428 Buenos Aires, Argentina e-mail: gcastell@iafe.uba.ar
2
National Radio Astronomy Observatory (NRAO), New Mexico, USA
Received:
21
February
2006
Accepted:
29
June
2006
Context.High-resolution, high-sensitivity multifrequency radio images of supernova remnants (SNRs) are essential in advancing the understanding of both the global SNR dynamics and particle acceleration mechanisms.
Aims.In this paper we report on a new study of the SNR Puppis A based on VLA observations at 1425 MHz; the improvement represents a factor of two in angular resolution and almost ten times in sensitivity compared to the best previous image of Puppis A. This new image is used to compare with re-processed 327 MHz data and ROSAT and Chandra images to investigate morphological and spectral characteristics.
Methods. The observations were carried out with the VLA in the
DnC and CnB configurations in 2004.
After combining
with single-dish data from Parkes, an angular resolution of
34 and an rms noise of 0.5 mJy beam-1, were achieved. Archival VLA data at 327 MHz were also
processed.
The spectral index distribution was then determined by a
direct comparison of the homogenized data at both 327 and 1425 MHz. In
addition, to identify different spectral components, tomographic spectral
analysis was performed.
Results.The new 1425 MHz radio image reveals a highly structured border
encircling a diffuse, featureless interior.
In particular, the
northern half of Puppis A displays a complex structure along
the
periphery, consisting of short arcs resembling “wave-like”
features.
These are oriented essentially
perpendicular to the shock front on the NE side, but are tangential to the
shock on the NW side. A remarkable
correspondence between such “wave-like” features and spectral changes
is observed. On the other hand, the brightest radio features
(located to the E of the SNR and also detected in X-rays)
have no counterpart in the spectral index
distribution. Based on a uniform compilation of
integrated flux densities
between 19 and 8400 MHz,
a global spectral index (
) has been determined.
The new 1425 MHz image of
Puppis A
was compared with the ROSAT X-ray image of the entire SNR and
with the resolved arcsec Chandra image of the bright E
region. There is good overall agreement between the radio
and high resolution X-ray images. At the arcsec level,
however, the
agreement
of the radio and X-ray images is less striking.
A noticeable similarity is found between Puppis A, with its E and W extensions, and analogous morphological features observed in the SNR W50. This suggests that Puppis A could be another
case of a SNR shaped by the action of energetic jets.
Key words: ISM: individual objects: Puppis A / ISM: supernova remnants / radio continuum: ISM
© ESO, 2006
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