Science-advisor
REGISTER info/FAQ
Login
username
password
     
forgot password?
register here
 
Research articles
  search articles
  reviews guidelines
  reviews
  articles index
My Pages
my alerts
  my messages
  my reviews
  my favorites
 
 
Stat
Members: 3643
Articles: 2'488'730
Articles rated: 2609

29 March 2024
 
  » arxiv » astro-ph/9807136

 Article overview


The PDS starburst galaxies
R. Coziol ; C. A. O. Torres ; G. R. Quast ; T. Contini ; E. Davoust ;
Date 14 Jul 1998
Subject astro-ph
AffiliationON), C. A. O. Torres (LNA/CNPq), G. R. Quast (LNA/CNPq), T. Contini (School of Physics & Astronomy, Tel Aviv Univ.), E. Davoust (Observatoire Midi-Pyrenees
Abstract(Abridged) We discuss the nature of the galaxies found in the Pico dos Dias Survey (PDS) for young stellar objects. The PDS galaxies were selected from the IRAS Point Source catalog. They have flux density of moderate or high quality at 12, 25 and 60 $mu$m and spectral indices in the ranges $-3.00 leq alpha(25,12) leq +0.35$ and $-2.50 leq alpha(60,25) leq +0.85$. These criteria allowed the detection of 382 galaxies, which are a mixture of starburst and Seyfert galaxies. The starburst galaxies show an excess of FIR luminosity and their IRAS colors are significantly different from those of Seyfert galaxies -- 99% of the starburst galaxies in our sample have a spectral index $alpha(60,25) < -1.9$. As opposed to Seyfert galaxies, very few PDS starbursts are detected in X-rays. In the infrared, the starburst galaxies form a continuous sequence with normal galaxies. But they generally can be distinguished from normal galaxies by their spectral index $alpha(60,25) > -2.5$. This color cut--off also marks a change in the dominant morphologies of the galaxies: the normal IRAS galaxies are preferentially late--type spirals (Sb and later), while the starbursts are more numerous among early--type spirals (earlier than Sbc). No difference is found between the starbursts detected in the FIR and those detected on the basis of UV excess. The PDS starburst galaxies represent the FIR luminous branch of the UV-bright starburst nucleus galaxies, with mean FIR luminosity $log({ m L}_{ m IR}/{ m L}_odot) = 10.3 pm 0.5$ and redshifts smaller than 0.1. They form a complete sample limited in flux in the FIR at $2 imes10^{-10}$ erg cm$^{-2}$ s$^{-1}$.
Source arXiv, astro-ph/9807136
Services Forum | Review | PDF | Favorites   
 
Visitor rating: did you like this article? no 1   2   3   4   5   yes

No review found.
 Did you like this article?

This article or document is ...
important:
of broad interest:
readable:
new:
correct:
Global appreciation:

  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 claudebot






ScienXe.org
» my Online CV
» Free


News, job offers and information for researchers and scientists:
home  |  contact  |  terms of use  |  sitemap
Copyright © 2005-2024 - Scimetrica