A starburst origin of the OH-megamaser emission from the galaxy Arp220

C. J. Skinner, H. A. Smith, E. Sturm, M. J. Barlow, R. J. Cohen and G. J. Stacey
Additional contact information
C. J. Skinner: Space Telescope Science Institute
H. A. Smith: National Air and Space Museum
E. Sturm: Max-Planck-Institut für Extraterrestrische Physik
M. J. Barlow: University College London
R. J. Cohen: Jodrell Bank
G. J. Stacey: Cornell University, Department of Astronomy

Nature, 1997, vol. 386, issue 6624, 472-474

Abstract: Abstract Ultraluminous infrared galaxies have been known for more than a decade, but the source of their very large far-infrared luminosities remains controversial. It may reflect a quasar-like active nucleus surrounded by a torus of dense gas and dust, the latter absorbing the energetic photons from the nuclear region and re-emitting at infrared wavelengths1, or a huge burst of massive-star formation in dense dusty clouds of molecular gas close to the nucleus2, which heats the surrounding dust. A number of ultraluminous galaxies are also a source of OH-megamaser emissions (intense laser-like spectral lines at microwave frequencies), an observation that may hold important clues as to the main power source in these galaxies. A general feature of many models3,4 is that the masers are pumped radiatively by the absorption of infrared photons. Identifying the source of the maser pump may therefore indicate whether the ultimate energy source is a burst of star formation, or an active nucleus. Here we report the detection of a strong mid-infrared OH absorption line in the prototypical megamaser and ultraluminous galaxy5, Arp220. We find that the power absorbed in this line alone is sufficient to pump the megamaser emission seen at radio wavelengths. Moreover, the warm, extended nature of the pumping region is suggestive of a starburst origin for the ultraluminous infrared emissions.

Date: 1997
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/386472a0 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:386:y:1997:i:6624:d:10.1038_386472a0

Ordering information: This journal article can be ordered from
https://www.nature.com/

DOI: 10.1038/386472a0

Access Statistics for this article

Nature is currently edited by Magdalena Skipper

More articles in Nature from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().