ar X iv : a st ro - p h / 07 02 67 8 v 1 2 6 Fe b 20 07 Low - Luminosity Extragalactic Water Masers toward M 82 , M 51 , and NGC 4051
نویسنده
چکیده
Sub-arcsecond observations using the Very Large Array (VLA) are presented of low-luminosity H2O maser emission in M82, M51, and NGC4051. New maser features have been detected within the M82 starburst complex. They are largely associated with star-forming activity such as optically-identified starburst-driven winds, H ii regions, or the early phase of star-formation in the galaxy. H2O maser in M51 consists of blueand red-shifted features relative to the systemic velocity of the galaxy. The red-shifted features are measured at the northwest of the nuclear radio source, while the location of the blue-shifted counterpart is displaced by ∼2” from the radio source. A small velocity gradient closely aligned with the radio jet is detected from the red-shifted features. The red-shifted maser most likely amplifies the background radio continuum jet, while the blue-shifted counterpart marks off-nuclear star-formation in the galaxy. All of the detected maser features in the narrow-line Seyfert 1 galaxy NGC4051 remain unresolved by new VLA observations. Due to the low luminosity of the maser, the maser excitation is not directly related to the active galactic nucleus. Subject headings: galaxies: active — galaxies: ISM — galaxies: individual: M82, M51, NGC4051
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تاریخ انتشار 2007