Search for the Sunyaev-Zel'dovich Effect in a Giant Radio Galaxy B1358+305
Abstract
We present results of an imaging observation of the central region of a giant radio galaxy B1358+305. The classical, standard scenario of Fanaroff-Riley II radio galaxies suggests that shock-produced hot electrons contained in a radio galaxy are a good reservoir of the jet-supplied energy from active nuclei. The aim of our observation is to search for the Sunyaev-Zel'dovich effect (SZE) induced by these hot electrons. The observation was performed at 21 GHz with the Nobeyama 45 m telescope. Deep imaging observation of a wide region of size 6farcm7 × 6farcm7 with the beam size θHPBW = 81farcs2 enables the most detailed examination of the possible thermal energy of electrons contained in a radio galaxy. The resultant intensity fluctuation is 0.56 mJy beam-1 (in terms of the Compton y-parameter, y = 1.04 × 10-4) at a 95% confidence level. The intensity fluctuation obtained with imaging analysis sets the most stringent upper limit on the fluctuations in the central region of a giant radio galaxy obtained so far, and our results will be a toehold for future plans of SZE observation in a radio galaxy.
- Publication:
-
The Astronomical Journal
- Pub Date:
- June 2010
- DOI:
- 10.1088/0004-6256/139/6/2494
- arXiv:
- arXiv:1004.2335
- Bibcode:
- 2010AJ....139.2494Y
- Keywords:
-
- cosmic background radiation;
- cosmology: observations;
- galaxies: active;
- galaxies: individual: B1358+305;
- radio continuum: galaxies;
- Astrophysics - Astrophysics of Galaxies;
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- 25 pages, 5 figures