A Steradian of the Southern Sky at 151.5 MHz using the Mauritius Radio Telescope

Details A Steradian of the Southern Sky at 151.5 MHz using the Mauritius Radio Telescope A Steradian of the Southern Sky at 151.5 MHz using the Mauritius Radio Telescope

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..12e..15p&link_type=abstract

Long Wavelength Astrophysics, 26th meeting of the IAU, Joint Discussion 12, 21 August 2006, Prague, Czech Republic, JD12, #15

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present a few results of a low frequency southern sky survey carried out using the Mauritius Radio Telescope (MRT). We present and discuss wide field images covering ~1.25 Steradian (18h≤RA≤24h,-75°≤δ≤-10°) of the sky at 151.5 MHz with an angular resolution of 4'x4'.6 and an rms noise of 260 mJy beam^-1. A source catalog of ~2,800 radio sources and its comparative study including cross identification with the Molonglo Reference Catalogue at 408 MHz and Culgoora catalogue at 160 MHz is described. The comparison reveals that there are no systematics in the final source list and the positional accuracies agree typically to about 0.07 times the MRT beam width. The procedures developed for flux calibration which involves scaling different images to a common level, estimation of the primary beam shape of the helix and recovery of the amplitude information of the signal lost in a 2-bit 3-level correlator with an AGC are discussed. Our true flux density estimates agree to within 6.3% with the known flux densities of 55 unresolved sources in the MS 4Jy sample. Due to low frequency and availability of short spacings, our images (surface brightness sensitivity ~2.1x10^-21 Wm^-2Hz^-1Sr^-1(σ)) are sensitive to extended sources like giant radio sources, relics and supernova remnants (SNRs). Recently observed sub-structures in X-ray temperature maps support the existence of extended shock waves at locations of several known cluster relics. We show a specific example of such extended radio emission from these proposed shocks around the X-ray cluster Abell3667 in the MRT image. These are steep spectrum sources and we expect to detect quite a few such sources in the MRT survey. An additional 0.5 Steradian of the sky (15h≤RA≤18h, -75°≤δ≤-10°) has also been imaged and its comparison with existing low frequency images to search for new SNR candidates is under progress. As an example of interesting sources in the images, we briefly discuss a few steep spectrum sources, giant radio sources, double sources, fossil galaxies and report the structure of a few resolved SNRs.

Affiliated with

Also associated with

No associations

Rating

A Steradian of the Southern Sky at 151.5 MHz using the Mauritius Radio Telescope does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A Steradian of the Southern Sky at 151.5 MHz using the Mauritius Radio Telescope, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Steradian of the Southern Sky at 151.5 MHz using the Mauritius Radio Telescope will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1785284