P CYGNI PROFILES OF MOLECULAR LINES TOWARD ARP 220 NUCLEI
- Academia Sinica, Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 10617, Taiwan (China)
- Department of Radio and Space Science, Chalmers University of Technology, Onsala Space Observatory, SE-439 92 Onsala (Sweden)
- Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
- Joint ALMA Observatory, Av. El Golf 40 - Piso 18, Las Condes, Santiago 7550108 (Chile)
- Kapteyn Astronomical Institute, P.O. Box 800, NL-9700 AV Groningen (Netherlands)
- Department of Astronomy, Nanjing University, 22 Hankou Road, Nanjing 210093 (China)
We report {approx}100 pc (0.''3) resolution observations of (sub)millimeter HCO{sup +} and CO lines in the ultraluminous infrared galaxy Arp 220. The lines peak at two merger nuclei, with HCO{sup +} being more spatially concentrated than CO. Asymmetric line profiles with blueshifted absorption and redshifted emission are discovered in HCO{sup +}(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 {approx}100 km s{sup -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.
- OSTI ID:
- 21313765
- Journal Information:
- Astrophysical Journal (Online), Vol. 700, Issue 2; Other Information: DOI: 10.1088/0004-637X/700/2/L104; Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-4357
- Country of Publication:
- United States
- Language:
- English
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