منابع مشابه
Extragalactic H2O masers and X-ray absorbing column densities
Having conducted a search for the λ∼1.3 cm (22GHz) water vapor line towards galaxies with nuclear activity, large nuclear column densities or high infrared luminosities, we present H2O spectra for NGC2273, UGC5101, and NGC3393 with isotropic luminosities of 7, 1500, and 400 L⊙. The H2O maser in UGC5101 is by far the most luminous yet found in an ultraluminous infrared galaxy. NGC3393 reveals th...
متن کاملObservations of extragalactic H2O masers in bright IRAS sources
We report the first results of an ongoing survey at 22GHz with the 100-m Effelsberg telescope to search for water maser emission in bright IRAS sources. We have detected water vapor emission in IC 342. The maser, associated with a star forming region ∼10–15 west of the nucleus, consists of a single 0.5 km s wide feature and reaches an isotropic luminosity of 10 L⊙ (D=1.8Mpc). Our detection rais...
متن کاملTheory and Extragalactic Masers
Theoretical research on extragalactic masers (and hence this review) is almost entirely directed toward 22 GHz water masers in circumnuclear disks with the focus being the near ideal masing disk at the nucleus of the galaxy NGC4258. The discussion here is organized around (1) the excitation and conditions for the masers, (2) the spatial and spectral appearance of the maser emission, and (3) the...
متن کامل**title** Asp Conference Series, Vol. **volume**, **publication Year** **editors** Extragalactic H2o Masers
Study of extragalactic H 2 O masers has progressed significantly in the 25 years since their discovery. Existing in star forming regions and in the accretion disks supermassive black holes, they are familiar and unfamiliar at the same time. A review of how our understanding has grown, up to the present day, is followed by comments on future prospects. Galactic water maser emission in regions of...
متن کاملExtragalactic water masers in bright IRAS sources
We report the results of a search for 22GHz water maser emission in IRAS-bright galaxies, using the 100-m Effelsberg telescope. In particular, we present the details of four new maser detections (IC 342, NGC 2146, NGC 3556, and Arp 299) and follow-up interferometric studies. A comparison between water maser detection rates derived in the present study and those in previous similar surveys is al...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 2002
ISSN: 0074-1809
DOI: 10.1017/s0074180900222754