P-Cygni Profiles of Molecular Lines toward Arp 220 Nuclei

Details P-Cygni Profiles of Molecular Lines toward Arp 220 Nuclei P-Cygni Profiles of Molecular Lines toward Arp 220 Nuclei

2009-06-29

arxiv.org/abs/0906.5197v1

Astrophys.J.700:L104-L108,2009

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

ApJL in press, 6 pages

Scientific paper

10.1088/0004-637X/700/2/L104

We report ~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 ~100 km/s 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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