A New Water Vapor Megamaser

We report on the detection of a new megamaser, the 31, 3–22, 0 H2O line ( GHz) in Arp 220, using n p 183.310 0 the Institut de Radioastronomie Millimétrique (IRAM) 30 m telescope. The line is about 350 km s 1 wide with a total luminosity of ∼2.5 # 10 K km s 1 pc. Although OH megamasers were first discovered in this source, no emission is seen in the 61, 6–52, 3 H2O transition ( GHz), a line otherwise detected as a megamaser n p 22.235 0 in about 50 sources to date. This fact puts interesting constraints on the physical conditions of the central region of Arp 220 that are further strengthened by the HCN and HNC and luminosities [in the range J p 3–2 J p 1–0 (1.5–10) # 10 K km s 1 pc]. A scenario with ∼106 star-forming cores similar to those found in Sgr B2 in the central kiloparsec of Arp 220 would be compatible with these data and would explain the lack of 22 GHz H2O emission. This result opens up the possibility of using the 183 GHz H2O line as an additional tool to explore the physical conditions in luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs, respectively) and their starburst or active galactic nucleus (AGN) nature, with a potential interest for high angular resolution observations with the Atacama Large Millimeter Array (ALMA). Subject headings: galaxies: individual (Arp 220) — galaxies: ISM — galaxies: starburst — ISM: abundances — radio lines: ISM