Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-25
Mon.Not.Roy.Astron.Soc.364:99-106,2005
Astronomy and Astrophysics
Astrophysics
8 pages, 3 figures, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2005.09541.x
We present Chandra snapshot observations for a sample of 7 sources selected from the Arecibo OH megamaser (OHM) survey at z~0.13-0.22 and with far-infrared luminosities in excess of 10^{11} L_sun. In contrast with the known H2O megamasers, which are mostly associated with powerful Active Galactic Nuclei (AGN), the situation is far less clear for OHMs, which have been poorly studied in the X-ray band thus far. All of the observed sources are X-ray weak, with only one OHM, IRAS FSC 03521+0028 (z=0.15), being detected by Chandra (with 5 counts). The results from this pilot program indicate that the X-ray emission, with luminosities of less than ~10^{42} erg/s, is consistent with that from star formation (as also suggested in some cases by the optical spectra) and low-luminosity AGN emission. If an AGN is present, its contribution to the broad-band emission of OHM galaxies is likely modest. Under reasonable assumptions about the intrinsic X-ray spectral shape, the observed count distribution from stacking analysis suggests absorption of ~10^{22} cm^{-2}.
Brandt Wiliam N.
Comastri Andrea
Darling Jeremy
Vignali Christian
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