Emergence of a Narrow H2O Maser Feature in NGC 1052

Details Emergence of a Narrow H2O Maser Feature in NGC 1052 Emergence of a Narrow H2O Maser Feature in NGC 1052

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...620..145k&link_type=abstract

The Astrophysical Journal, Volume 620, Issue 1, pp. 145-150.

Astronomy and Astrophysics

Astronomy

7

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

Scientific paper

We report the emergence of a narrow H2O maser feature with an FWHM of 21 km s-1 in the LINER NGC 1052, which has been known to show only a broad (FWHM>100 km s-1) 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-1 is redshifted by 328 km s-1 with respect to the systemic velocity. Broad features with peak velocities of 1510 and 1704 km s-1, 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.

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