Astrophys. J., 892, 18-18 (2020/March-3)
A more efficient search for H2O megamaser galaxies: the power of X-ray and mid-infrared photometry.
KUO C.Y., HSIANG J.Y., CHUNG H.H., CONSTANTIN A., CHANG Y.-Y., DA CUNHA E., PESCE D., CHIEN W.T., CHEN B.Y., BRAATZ J.A., ZAW I., MATSUSHITA S. and LIN J.C.
Abstract (from CDS):
We present an investigation of the dependence of H2O maser detection rates and properties on the mid-IR active galactic nucleus (AGN) luminosity, LAGN, and the obscuring column density, NH, based on mid-IR and hard X-ray photometry. Based on spectral energy distribution fitting that allows for decomposition of the black hole accretion and star formation components in the mid-infrared, we show that the megamaser (disk maser) detection rate increases sharply for galaxies with 12 µm AGN luminosity L_12µm_AGN greater than 1042 erg s–1, from <=3% (<=2%) to ∼12% (∼5%). By using the ratio of the observed X-ray to mid-IR AGN luminosity as an indicator of NH, we also find that megamaser (disk maser) detection rates are boosted to 15% (7%) and 20% (9%) for galaxies with NH >= 1023 cm–2 and NH >= 1024 cm–2, respectively. Combining these column density cuts with a constraint for high L_12µm_AGN (>=1042 erg s–1) predicts further increases in the megamaser (disk maser) detection rates to 19% (8%) and 27% (14%), revealing unprecedented potential increases of the megamaser and disk maser detection rates by a factor of 7-15 relative to the current rates, depending on the chosen sample selection criteria. A noteworthy aspect of these new predictions is that the completeness rates are only compromised mildly, with the rates remaining at the level of ∼95%(∼50%) for sources with NH >= 1023 cm–2 (NH >= 1024 cm–2). Applying these selection methods to current X-ray AGN surveys predicts the detection of >=15 new megamaser disks.
© 2020. The American Astronomical Society. All rights reserved.
Megamasers - Astrophysical masers - Active galactic nuclei - Active galaxies - X-ray active galactic nuclei - X-ray surveys - Surveys - Broad band photometry - Infrared photometry
VizieR on-line data:
<Available at CDS (J/ApJ/892/18): table2.dat table3.dat>
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