A search for OH absorption in NGC 1275

Details A search for OH absorption in NGC 1275 A search for OH absorption in NGC 1275

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94.1476o&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 94, Dec. 1987, p. 1476-1479.

Astronomy and Astrophysics

Astronomy

7

Absorption Spectra, Galactic Clusters, Galactic Nuclei, Hydroxyl Emission, Very Large Array (Vla), Astronomical Spectroscopy, Mass Distribution, Molecular Gases, Optical Thickness

Scientific paper

The authors report a VLA search for OH absorption at 1665 and 1667 MHz against the nucleus of NGC 1275 (3C 84), the dominant galaxy in the Perseus cluster. They find no absorption in the low-velocity system (heliocentric velocity 5320 km/s) within a 2200 km/s bandpass. The upper limit to the apparent optical depth of any absorption feature is τ < 8×10-4 in the low-velocity system. The authors place a model-dependent upper limit to the mass of molecular gas in NGC 1275 of M(H2) < 6.2×108M_sun;. They also searched for OH in the high-velocity system (heliocentric velocity 8115 km/s) within a 281 km/s bandpass and obtained an upper limit to the apparent optical depth of τ < 10-2.

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