2013ApJ...768L..38H -
Astrophys. J., 768, L38 (2013/May-2)
Submillimeter H2 O maser in Circinus galaxy–a new probe for the circumnuclear region of active galactic nuclei.
HAGIWARA Y., MIYOSHI M., DOI A. and HORIUCHI S.
Abstract (from CDS):
We present the first detection of extragalactic submillimeter H2O maser in the 321 GHz transition toward the center of Circinus galaxy, the nearby Type 2 Seyfert using the Atacama Large Millimeter/Submillimeter Array. We find that Doppler features of the detected 321 GHz H2 O maser straddle the systemic velocity of the galaxy as seen in the spectrum of the known 22 GHz H2 O maser in the galaxy. By comparing the velocities of the maser features in both transitions, it can be deduced that the 321 GHz maser occurs in a region similar to that of the 22 GHz maser, where the sub-parsec-scale distribution of the 22 GHz maser was revealed by earlier very long baseline interferometry observations. The detected maser features remain unresolved at the synthesized beam of ∼0.''66 (∼15 pc) and coincide with the 321 GHz continuum peak within small uncertainties. We also present a tentative detection of the highest velocity feature (redshifts up to ∼635 km/s) in the galaxy. If this high-velocity feature arises from a Keplerian rotating disk well established in this galaxy, it is located at a radius of ∼0.018 pc (∼1.2 x105 Schwarzschild radii), which might probe molecular material closest to the central engine.
Abstract Copyright:
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Journal keyword(s):
galaxies: active - galaxies: individual: Circinus - galaxies: ISM - galaxies: nuclei - masers - submillimeter: galaxies
Simbad objects:
7
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