Arp 220 - IC 4553/4: understanding the system and diagnosing the ISM
W. A. Baan
TL;DR
This paper reviews radio and mm-wave observations of Arp 220 to understand its dense interstellar medium and the ongoing star formation in its merging nuclei.
Contribution
It provides an integrated analysis of multi-wavelength data to diagnose the ISM in Arp 220, enhancing understanding of galaxy merger processes.
Findings
Detection of HI absorption and OH Megamaser emission.
Recognition as the nearest ultra-luminous infrared galaxy.
Insights into the dense ISM fueling star formation.
Abstract
Arp220 is a nearby system in final stages of galaxy merger with powerful ongoing star-formation at and surrounding the two nuclei. Arp 220 was detected in HI absorption and OH Megamaser emission and later recognized as the nearest ultra-luminous infrared galaxy also showing powerful molecular and X-ray emissions. In this paper we review the available radio and mm-wave observational data of Arp 220 in order to obtain an integrated picture of the dense interstellar medium that forms the location of the powerful star-formation at the two nuclei.
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