5 CM OH absorption toward the megamaser galaxy IC 4553

Details 5 CM OH absorption toward the megamaser galaxy IC 4553 5 CM OH absorption toward the megamaser galaxy IC 4553

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...168l..13h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 168, no. 1-2, Nov. 1986, p. L13-L15.

Astronomy and Astrophysics

Astrophysics

21

Absorption Spectra, Centimeter Waves, Galactic Structure, Hydroxyl Emission, Interstellar Masers, Radio Spectra, Energy Levels, Far Infrared Radiation, Photons

Scientific paper

Absorption in the 2Π3/2 J = 5/2 main line of OH at 6035 MHz, 120K above the ground state, is reported from the OH megamaser galaxy IC 4553 (Arp 220). An upper limit is given for Mrk 231. For IC 4553, the authors derive an OH rotation temperature Trot ≡ 45K between the 2Π3/2 J = 5/2 and 3/2 ground levels, that is ≡30% below the dust temperature. Potential pumping mechanisms for the inversion of the ground state doublet are discussed and it is argued that the most likely OH excitation scenario involves pumping by FIR photons (79, 119 μm) and centimeter wave photons (5, 6 cm).

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