Barred CO emission in HE 1029-1831^*

¹ I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
² Harvard-Smithsonian Center for Astrophysics, SMA project, 645 North A`ohoku Place, Hilo, HI 96720, USA e-mail: mkrips@cfa.harvard.edu
³ Institut de Radio Astronomie Millimetrique (IRAM), 300 rue de la Piscine, 38406 Saint Martin d'Hères, France
⁴ NASA/Goddard Space Flight Center, Code 665, Building 21, Greenbelt, MD 20771, USA
⁵ University of Maryland, College Park, MD 20742, USA

Received: 14 June 2006
Accepted: 29 November 2006

Abstract

We present CO(1–0) and CO(2–1) line emission maps of the barred spiral active galaxy HE 1029-1831 () obtained with the IRAM Plateau de Bure Interferometer (PdBI) and in part by the Berkeley-Illinois-Maryland Association (BIMA) observatory. The CO emission is well associated with the optical bar and extended along it. The FWHM of the CO emission is estimated to be ~() kpc. The CO emission shows a strong velocity gradient along the minor axis of the bar (). The molecular gas mass is estimated to be ~, which indicates a very gas rich host galaxy. Most of the molecular gas appears to be subthermally excited and cold but we also find weak evidence for a warmer and/or denser gas component at the southern part of the bar emission, about ~4 kpc from the galactic nucleus.