Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 700, Issue 2, Pages L104-L108Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/700/2/L104
Keywords
galaxies: active; galaxies: evolution; galaxies: individual (Arp 220)
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Funding
- Smithsonian Institution
- Academia Sinica
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We report similar to 100 pc (0 ''.3) resolution observations of (sub) millimeter HCO(+) and CO lines in the ultraluminous infrared galaxy Arp 220. The lines peak at two merger nuclei, with HCO(+) being more spatially concentrated than CO. Asymmetric line profiles with blueshifted absorption and redshifted emission are discovered in HCO(+)(3-2) and (4-3) toward the two nuclei and in CO(3-2) toward one nucleus. We suggest that these P Cygni profiles are due to similar to 100 km s(-1) outward motion of molecular gas from the nuclei. This gas is most likely outflowing from the inner regions of the two nuclear disks rotating around individual nuclei, clearing the shroud around the luminosity sources there.
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