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Probing AGN with Water Masers

Published online by Cambridge University Press:  25 May 2016

J. M. Moran ,
L. J. Greenhill ,
J. R. Herrnstein ,
P. J. Diamond ,
M. Miyoshi ,
N. Nakai  and
M. Inoue
J. M. Moran
Affiliation:
Harvard–Smithsonian Center for Astrophyusics 60 Garden St., Cambridge MA 02138 National Radio Astronomy Observatory Socorro NM 86801 National Astronomical Observatory Minamisaku, Minamimaki, Nagano, 384–13, Japan
L. J. Greenhill
Affiliation:
Harvard–Smithsonian Center for Astrophyusics 60 Garden St., Cambridge MA 02138 National Radio Astronomy Observatory Socorro NM 86801 National Astronomical Observatory Minamisaku, Minamimaki, Nagano, 384–13, Japan
J. R. Herrnstein
Affiliation:
Harvard–Smithsonian Center for Astrophyusics 60 Garden St., Cambridge MA 02138 National Radio Astronomy Observatory Socorro NM 86801 National Astronomical Observatory Minamisaku, Minamimaki, Nagano, 384–13, Japan
P. J. Diamond
Affiliation:
Harvard–Smithsonian Center for Astrophyusics 60 Garden St., Cambridge MA 02138 National Radio Astronomy Observatory Socorro NM 86801 National Astronomical Observatory Minamisaku, Minamimaki, Nagano, 384–13, Japan
M. Miyoshi
Affiliation:
Harvard–Smithsonian Center for Astrophyusics 60 Garden St., Cambridge MA 02138 National Radio Astronomy Observatory Socorro NM 86801 National Astronomical Observatory Minamisaku, Minamimaki, Nagano, 384–13, Japan
N. Nakai
Affiliation:
Harvard–Smithsonian Center for Astrophyusics 60 Garden St., Cambridge MA 02138 National Radio Astronomy Observatory Socorro NM 86801 National Astronomical Observatory Minamisaku, Minamimaki, Nagano, 384–13, Japan
M. Inoue
Affiliation:
Harvard–Smithsonian Center for Astrophyusics 60 Garden St., Cambridge MA 02138 National Radio Astronomy Observatory Socorro NM 86801 National Astronomical Observatory Minamisaku, Minamimaki, Nagano, 384–13, Japan

Extract

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Observations of the angular distribution of the water masers in the nucleus of NGC4258 reveal the presence of a thin molecular disk in nearly perfect Keplerian orbit (Miyoshi et al., 1995; Moran et al., 1995). About 300 galaxies have been searched for nuclear water masers to a limiting sensitivity of about 0.1 Jy (e.g., Braatz, 1996); and 16 masers have been detected. The maser imaged by Miyoshi et al. (1995) offers the best example of disk structure. VLA data of NGC1068 shows evidence of disk structure (Gallimore et al., 1996; Greenhill & Gwinn, 1996) and NGC2639 has drifting features, which may be due to centripetal acceleration (Wilson et al., 1995).

Type
Relation between Radio and Other Wavelenghts
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 211 - 214
Copyright
Copyright © Kluwer 1996 

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