An elusive radio halo in the merging cluster Abell 781?

Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

5 pages, 4 figures, 1 table - Accepted for publication on Monthly Notices of the Royal Astronomical Society Letters

Scientific paper

Deep radio observations of the galaxy cluster Abell 781 have been carried out using the Giant Metrewave Radio Telescope at 325 MHz and have been compared to previous 610 MHz observations and to archival VLA 1.4 GHz data. The radio emission from the cluster is dominated by a diffuse source located at the outskirts of the X-ray emission, which we tentatively classify as a radio relic. We detected residual diffuse emission at the cluster centre at the level of S(325 MHz)~15-20 mJy. Our analysis disagrees with Govoni et al. (2011), and on the basis of simple spectral considerations we do not support their claim of a radio halo with flux density of 20-30 mJy at 1.4 GHz. Abell 781, a massive and merging cluster, is an intriguing case. Assuming that the residual emission is indicative of the presence of a radio halo barely detectable at our sensitivity level, it could be a very steep spectrum source.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

An elusive radio halo in the merging cluster Abell 781? 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 An elusive radio halo in the merging cluster Abell 781?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An elusive radio halo in the merging cluster Abell 781? will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-317535

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.