The association between water kilomasers and compact radio sources in the starburst galaxy NGC 2146

Free access article

Issue		A&A Volume 389, Number 1, July I 2002


Page(s)		L39 - L42
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:20020719

A&A 389, L39-L42 (2002)
DOI: 10.1051/0004-6361:20020719

Letter

The association between water kilomasers and compact radio sources in the starburst galaxy NGC 2146

A. Tarchi^{1, 2}, C. Henkel¹, A. B. Peck^{1, 3} and K. M. Menten¹

¹ Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
² Istituto di Radioastronomia, CNR, via Gobetti 101, 40129 Bologna, Italy
³ Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge MA 02138, USA

(Received 26 March 2002 / Accepted 16 May 2002 )

Abstract
We report the detection of 22 GHz water vapor emission toward the starburst galaxy NGC 2146, made using the Effelsberg 100-m telescope. Interferometric observations with the Very Large Array (VLA) show that a part of the emission originates from two prominent sites of star formation that are associated with compact radio continuum sources, likely ultra-compact HII regions. It is concluded that the emission arises from the most luminous and distant H ₂O "kilomasers" detected so far. Our data increase the number of water maser detections in northern galaxies ( ${\rm Dec} >-30^{\circ}$ ) with IRAS point source fluxes $S_{\rm 100\mu m}$ > 50 Jy to 18%.

Key words: galaxies: individual: NGC 2146 -- galaxies: starburst -- galaxies: ISM -- masers -- radio lines: ISM -- radio lines: galaxies

Offprint request: A. Tarchi, atarchi@ira.bo.cnr.it

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