Peck, Falcke, Henkel et al. 2000: Megamaser in Mrk 348
A Flaring Megamaser in Mrk 348
Alison Peck1, Heino Falcke1, Christian Henkel1, Karl M. Menten1, Yoshiaki Hagiwara1, Jack F. Gallimore2, James S. Ulvestad3
1Max-Planck-Institut für Radioastronomie, Auf den Hüugel 69, D-53121 Bonn, Germany
2Bucknell University, Lewisburg, PA 17837, USA
3NRAO, P.O. Box 0, Socorro, NM 87801, USA
to appear in: IAU Symp. 206, Cosmic Masers: From Protostars to
Black Holes, eds. V. Migenes et al., ASP Conf. Ser.
We report new observations of the H2O megamaser in the Seyfert 2
galaxy Mrk 348. Following our initial detection in 2000 March using
the Effelsberg 100 m telescope, re-analysis of previous data on this
source indicates that the maser was present but only marginally
detectable in late 1997. Monitoring through late 2000 shows that the
maser has again decreased to its original level. The H2O line is
redshifted by ~130 km s-1 with respect to the systemic
velocity, is extremely broad, with a FWHM of 130 km s-1, and has
no detectable high velocity components within 1500 km s-1 on
either side of the strong line. Followup VLBA observations show that
the maser emission emanates entirely from a region <=0.25 pc in
extent, toward the base of the radio jet.
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