Spectral Ages of Giant Radio Sources

Details Spectral Ages of Giant Radio Sources Spectral Ages of Giant Radio Sources

2009-05-04

arxiv.org/abs/0905.0449v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

To appear in ASP Conference Series, Vol. 407, The Low-Frequency Radio Universe, eds D. J. Saikia, D. A. Green, Y. Gupta and T.

Scientific paper

Multifrequency observations with the GMRT and the VLA are used to determine the spectral breaks in consecutive strips along the lobes of a sample of selected giant radio sources (GRSs) in order to estimate their spectral ages. The maximum spectral ages estimated for the detected radio emission in the lobes of our sample of ten sources has a median value of $\sim$20 Myr. The spectral ages of these GRSs are significantly older than smaller sources. In all but one source (J1313+6937) the spectral age gradually increases with distance from the hotspot regions, confirming that acceleration of the particles mainly occurs in the hotspots. Most of the GRSs do not exhibit zero spectral ages in the hotspots. This is likely to be largely due to contamination by more extended emission due to relatively modest resolutions. The injection spectral indices range from $\sim$0.55 to 0.88 with a median value of $\sim$0.6. We show that the injection spectral index appears to be correlated with luminosity and/or redshift as well as with linear size.

Affiliated with

Also associated with

No associations

Rating

Spectral Ages of Giant Radio Sources 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 Spectral Ages of Giant Radio Sources, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectral Ages of Giant Radio Sources will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-200039