| | |
| | |
Stat |
Members: 3643 Articles: 2'479'597 Articles rated: 2609
19 March 2024 |
|
| | | |
|
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 | Affiliation: | 1 and 5), R. Beck , J.J. Condon , A. Bosma , K. Matthews and T.H. Jarrett ( Caltech, MPIfR, NRAO, Obs. Marseille, IPAC | Abstract: | Three 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 | 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 claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |