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Densitometry and Thermometry of Starburst Galaxies

J. G. Mangum ; J. Darling ; K. M. Menten ; C. Henkel ; Susanne Aalto (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik ; Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; M. Spaans ; P. van der Werf ; A. Ginsburg ; E. Fomalont ; B. Cotton ; B. Kent
EAS Publications Series: 6th Zermatt Symposium on Conditions and Impact of Star Formation: From Lab to Space 2015; 3m-KOSMA Telescope on GornergratZermatt; Switzerland; 7 September 2015 through 11 September 2015 (1633-4760). Vol. 75-76 (2016), p. 61-65.
[Konferensbidrag, refereegranskat]

With a goal toward deriving the physical conditions in external galaxies, we have conducted a survey and subsequent high spatial resolution imaging of formaldehyde (H2CO) and ammonia (NH3) emission and absorption in a sample of starburst galaxies. In this article we present the results from a subset of this survey which focuses on high spatial resolution measurements of volume density-and kinetic temperature-sensitive transitions of the H2CO molecule. The volume density structure toward the nuclear region of NGC 253 has been derived from ? ≠4 arcsec NRAO Very Large Array (VLA) measurements of the 110-111 and 211-212 K-doublet transitions of H2CO. The kinetic temperature structure toward NGC 253 and NGC 4945 has been derived from ? ≠0.5-1.0 arcsec measurements of the H2CO 3K-1K+1-2K-1K+1 (near 218 GHz) and 5K-1K+1-4K-1K+1 (near 365 GHz) transitions acquired using the Atacama Large Millimeter/submillimeter Array (ALMA). These measurements have allowed us to characterize the dense gas and kinetic temperature structure within these star forming galaxies, which is a first step toward associating dense star-forming gas and the heating processes at work within galaxies.



Denna post skapades 2016-07-06. Senast ändrad 2016-08-12.
CPL Pubid: 239072

 

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