2006A&A...459..535C


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.13CET06:10:35

2006A&A...459..535C - Astronomy and Astrophysics, volume 459, 535-544 (2006/11-4)

New VLA observations of the SNR Puppis A: the radio properties and the correlation with the X-ray emission.

CASTELLETTI G., DUBNER G., GOLAP K. and GOSS W.M.

Abstract (from CDS):

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. In this paper we report on a new study of the SNR Puppis A based on VLA observations at 1425MHz; 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 327MHz data and ROSAT and Chandra images to investigate morphological and spectral characteristics. 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''x16'' and an rms noise of 0.5mJy/beam, were achieved. Archival VLA data at 327MHz were also processed. The spectral index distribution was then determined by a direct comparison of the homogenized data at both 327 and 1425MHz. In addition, to identify different spectral components, tomographic spectral analysis was performed. The new 1425MHz 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 8400MHz, a global spectral index α=-0.52±0.03 (S∝να) 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.

Abstract Copyright:

Journal keyword(s): ISM: individual objects: Puppis A - ISM: supernova remnants - radio continuum: ISM

Simbad objects: 14

goto Full paper

goto View the reference in ADS

Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 SN 1572A SN* 00 25 21.5 +64 08 27           B8 1047 1
2 7C 022118.10+273638.00 Sy1 02 24 12.2882485914 +27 50 11.569481672   19.502 18 18.263   ~ 203 1
3 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1236 1
4 3C 190 QSO 08 01 33.5526629491 +14 14 42.815302770   21.07 20.26 18.972   ~ 212 2
5 PSR J0821-4300 Psr 08 21 58.2 -43 00 22           ~ 111 2
6 NAME Pup A SNR 08 24 07 -42 59.8           ~ 507 1
7 QSO B0826-373 QSO 08 28 04.78022012 -37 31 06.2809892   16       ~ 39 0
8 SNR G292.0+01.8 SNR 11 24 59 -59 19.1           ~ 280 1
9 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3628 1
10 NAME Kepler SNR Rad 17 30 35.976 -21 28 56.23           SNIa 698 4
11 SS 433 HXB 19 11 49.5645897701 +04 58 57.824087535   16.3 13.0     A7Ib: 1901 3
12 SNR G039.7-02.0 SNR 19 12 20 +04 55.0           ~ 306 1
13 UGC 12064 AGN 22 31 20.625 +39 21 29.81   14.6       ~ 415 1
14 NAME Cas A SNR 23 23 24.000 +58 48 54.00           ~ 2340 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2006A&A...459..535C and select 'bookmark this link' or equivalent in the popup menu


2019.12.13-06:10:35

© Université de Strasbourg/CNRS

    • Contact