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19 March 2024
 
  » arxiv » astro-ph/0305046

 Article overview


Nascent starbursts in synchrotron-deficient galaxies with hot dust
H. Roussel ; G. Helou ; R. Beck ; J.J. Condon ; A. Bosma ; K. Matthews ; T.H. Jarrett ;
Date 4 May 2003
Journal Astrophys.J. 593 (2003) 733-759; Erratum-ibid. 601 (2004) 1160
Subject astro-ph
Affiliation1 and 5), R. Beck , J.J. Condon , A. Bosma , K. Matthews and T.H. Jarrett ( Caltech, MPIfR, NRAO, Obs. Marseille, IPAC
AbstractThree nearby galaxies which have abnormally high infrared to radio continuum ratios, NGC 1377, IC 1953 and NGC 4491, are investigated with a view to understanding the physical origin of their peculiarity. We review the existing data and present new radio continuum measurements along with near-infrared integral-field spectroscopy and molecular gas observations. The three galaxies have low luminosities but starburst-like infrared colors; in NGC 1377, no synchrotron emission is detected at any wavelength; in IC 1953, the observed synchrotron component is attributable to the spiral disk alone, and is lacking in the central regions; the radio spectrum of NGC 4491 is unusually flat. We also compare and contrast them with NGC 4418, a heavily extinguished galaxy which shares some attributes with them. After examining various scenarios, we conclude that these galaxies are most likely observed within a few Myr of the onset of an intense star formation episode after being quiescent for at least ~ 100 Myr. This starburst, while heating the dust, has not produced optical signatures nor a normal amount of cosmic rays yet. We briefly discuss the statistics of such galaxies and what they imply for star formation surveys.
Source arXiv, astro-ph/0305046
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