2005ApJ...620..145K -
Astrophys. J., 620, 145-150 (2005/February-2)
Emergence of a narrow H2O maser feature in NGC 1052.
KAMENO S., NAKAI N., SAWADA-SATOH S., SATO N. and HABA A.
Abstract (from CDS):
We report the emergence of a narrow H2O maser feature with an FWHM of 21 km/s in the LINER NGC 1052, which has been known to show only a broad (FWHM>100 km/s) maser line profile with relatively bright continuum radio emission. The new narrow maser feature with a peak flux density of 47 mJy at VLSR=1787 km/s is redshifted by 328 km/s with respect to the systemic velocity. Broad features with peak velocities of 1510 and 1704 km/s, more redward than ever observed before, are also detected. The profile of the new narrow feature possibly shows brightening by 16%±9% and narrowing by 30%±12% between 2003 May 30 and June 2. During the same time, the continuum flux density has increased by 21%. Synchronous variation of maser and continuum flux densities on a timescale of days resembles that in Mrk 348, which is also a broad megamaser source with a bright radio continuum. Continuum and maser brightening and narrowing indicate that an increase of the background seed photon and an increase of maser gain have occurred simultaneously. A jet component running behind a mixture of ionized regions and X-ray dissociation regions at a subrelativistic velocity can produce such short-time variation. Another explanation is an interaction between the jet and molecular clouds.
Abstract Copyright:
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Journal keyword(s):
Galaxies: Active - Galaxies: Individual: Alphanumeric: J0241-0815 - Galaxies: Individual: NGC Number: NGC 1052 - Galaxies: Individual: Alphanumeric: PKS B0238-084 - Galaxies: Nuclei - Masers - Radio Lines: Galaxies - Techniques: Spectroscopic
Simbad objects:
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