Theory and Extragalactic Masers
arXiv:astro-ph/0107572
Abstract
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 mass accretion rate and structure of the disk. In addition, a summary is given of the basic physics (spectral linebeadths and maser polarization) that underlies certain interpretations of these and other astrophysical masers.
to appear in the proceedings of IAU Symposium #206: Cosmic Masers (Mangaratiba, Brazil; March 2001); 16 pages; 5 figures; uses newpasp.sty
References in corpus (12)
- The Formation and Structure of a Strongly Magnetized Corona above Weakly Magnetized Accretion Disks
- Is the Accretion Flow in NGC 4258 Advection-dominated?
- What is the Accretion Rate in NGC 4258?
- Megamaser Disks in Active Galactic Nuclei
- Doppler-Shift Asymmetry in High-Velocity Maser Emission from Shocks in Circumnuclear Disks
- A Non-Zeeman Interpretation for Polarized Maser Radiation and the Magnetic Field at the Atmospheres of Late-Type Giants
- High Resolution Infrared Imaging of the Compact Nuclear Source in NGC4258
- Accelerations of Water Masers in NGC4258
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- Polarimetric Observations of the Masers in NGC 4258: An Upper Limit on the Large-Scale Magnetic Field 0.2 pc from the Central Engine
- Response of circumnuclear water masers to luminosity changes in an active galactic nucleus
- Stimulated Raman scattering of water maser lines in astrophysical plasmas