|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'502'364
Articles rated: 2609
23 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
The 2dF Galaxy Redshift Survey: The population of nearby radio galaxies at the 1 mJy level | | M. Magliocchetti
; S.J. Maddox
; C.A. Jackson
; J. Bland-Hawthorn
; T. Bridges
; R. Cannon
; S. Cole
; M. Colless
; C. Collins
; W. Couch
; G. Dalton
; R. de Propris
; S.P. Driver
; G. Efstathiou
; R.S. Ellis
; C.S. Frenk
; K. Glazebrook
; O. Lahav
; I. Lewis
; S. Lumsden
; J.A. Peacock
; B. A. Peterson
; W. Sutherland
; K. Taylor
; | | Date: |
23 Jun 2001 | | Journal: | Mon.Not.Roy.Astron.Soc. 333 (2002) 100 | | Subject: | astro-ph | | Abstract: | We use redshift determinations and spectral analysis of galaxies in the 2dF Galaxy Redshift Survey to study the properties of local radio sources with $Sge 1$ mJy. 557 objects drawn from the FIRST survey, corresponding to 2.3 per cent of the total radio sample, are found in the 2dFGRS cataloge within the area $9^h 48^m simlt {
m RA}({
m 2000}) simlt 14^h 32^m$ and $-2.77^circ simlt {
m dec}({
m 2000}) simlt 2.25^circ$, down to a magnitude limit $b_J= 19.45$. The excellent quality of 2dF spectra allows us to divide these sources into classes, according to their optical spectra. Radio galaxies (i.e. absorption systems, mainly belonging to the class of FR I sources, whose spectra may or may not show emission lines due to AGN activity) make up 63 per cent of the spectroscopic sample; they are characterized by relatively high radio-to-optical ratios, red colours and luminosities $10^{21}simlt P_{1.4{
m GHz}} W Hz^${-1}$ sr$^{-1}$ simlt 10^{24}$. Actively star-forming galaxies instead contribute with 30 per cent to the total sample. These objects -- principally found at low redshifts ($z simlt 0.1$) -- in general show low radio-to-optical ratios, blue colours and low radio luminosities. We also found 18 Seyfert 2 galaxies and 4 Seyfert 1’s. Analysis of the local radio luminosity function shows that radio galaxies are well described by models that assume pure luminosity evolution, at least down to radio powers $P_{1.4{
m GHz}}simlt 10^{20.5} W Hz$^{-1}$ sr$^{-1}$ Late-type galaxies, whose relative contribution to the RLF is found to be lower than was predicted by previous work, present a luminosity function which is compatible with the IRAS galaxy LF, and therefore plausibly constitute the radio counterpart of the dusty spirals and starbursts that dominate the counts at 60 $mu$m. | | Source: | arXiv, astro-ph/0106430 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER