Outflow and accretion detections in the young stellar object IRAS 04579+4703

¹ National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China
e-mail: xujl@bao.ac.cn
² Graduate University of the Chinese Academy of Sciences, 100080 Beijing, PR China
³ I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany

Received: 16 December 2011
Accepted: 16 March 2012

Abstract

We present Submillimeter Array observations of the young stellar object IRAS 04579+4703 in the 1.3 mm continuum and in the ¹²CO(2−1), ¹³CO(2−1), and C¹⁸O(2−1) lines. The 1.3 mm continuum image reveals a flattened structure with a mass of 13 M_⊙. The ¹²CO(2−1) line map and position-velocity diagram, together with the broad wing (full width = 30 km s^-1) of the ¹²CO(2−1) line, clearly show that there is an outflow motion, which originates from an embedded massive YSO in this region. The lengths of the blue-shifted and red-shifted lobes are 0.14 pc and 0.13 pc, respectively. The total gas mass, average dynamical timescale, and mass entrainment rate of the outflow are 1.8 M_⊙, 1.7 × 10⁴ yr and 1.1 × 10^-4M_⊙  yr^-1, respectively. The flattened morphology of the continuum source perpendicular to the outflow direction, and the velocity gradient seen in the spectra of C¹⁸O(2−1) taken from different locations along the major axis of the continuum source, suggest that there is an accretion disk in this region.