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A flaring megamaser in Mrk 348

Published online by Cambridge University Press:  03 August 2017

Alison B. Peck ,
Heino Falcke ,
Christian Henkel ,
Karl M. Menten ,
Yoshiaki Hagiwara ,
Jack F. Gallimore  and
James S. Ulvestad
Alison B. Peck
Affiliation:
MPIfR, Auf dem Hügel 69, D-53121 Bonn, Germany
Heino Falcke
Affiliation:
MPIfR, Auf dem Hügel 69, D-53121 Bonn, Germany
Christian Henkel
Affiliation:
MPIfR, Auf dem Hügel 69, D-53121 Bonn, Germany
Karl M. Menten
Affiliation:
MPIfR, Auf dem Hügel 69, D-53121 Bonn, Germany
Yoshiaki Hagiwara
Affiliation:
MPIfR, Auf dem Hügel 69, D-53121 Bonn, Germany
Jack F. Gallimore
Affiliation:
Bucknell Univ., Lewisburg, PA 17837
James S. Ulvestad
Affiliation:
NRAO, P.O. Box 0, Socorro, NM 87801

Abstract

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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, a 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.

Type
Part 5. Extragalactic Nuclear Masers
Information
Symposium - International Astronomical Union , Volume 206: Cosmic Masers: From Protostars to Blackholes , 2002 , pp. 434 - 437
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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