Radio Continuum and Methanol Observations of DR21(OH)

Abstract

We report high sensitivity sub-arcsecond angular resolution observations of the massive star forming region DR21(OH) at 3.6, 1.3, and 0.7 cm obtained with the Very Large Array. In addition, we conducted observations of CH3OH 44 GHz masers. We detected more than 30 new maser components in the DR21(OH) region. Most of the masers appear to trace a sequence of bow-shocks in a bipolar outflow. The cm continuum observations reveal a cluster of radio sources; the strongest emission is found toward the molecular core MM1. The radio sources in MM1 are located about 5" north of the symmetry center of the CH3OH outflow, and therefore, they are unlikely to be associated with the outflow. Instead, the driving source of the outflow is likely located in the MM2 core. Although based on circumstantial evidence, the radio continuum from MM1 appears to trace free-free emission from shock-ionized gas in a jet. The orientation of the putative jet in MM1 is approximately parallel to the CH3OH outflow and almost perpendicular to the large scale molecular filament that connects DR21 and DR21(OH). This suggests that the (accretion) disks associated with the outflows/jets in the DR21 - DR21(OH) region have symmetry axes mostly perpendicular to the filament.

26 pages, 6 figures. Accepted for publication in the Astrophysical Journal

References in corpus (13)

• A Catalog of Extended Green Objects (EGOs) in the GLIMPSE Survey: A new sample of massive young stellar object outflow candidates
• The earliest phases of high-mass star formation: a 3 square degree millimeter continuum mapping of Cygnus X
• Methanol masers : Reliable tracers of the early stages of high-mass star formation
• WFCAM, Spitzer-IRAC and SCUBA observations of the massive star forming region DR21/W75: I. The collimated molecular jets
• Interferometric Mapping of Magnetic Fields in Star-forming Regions III. Dust and CO polarization in DR21(OH)
• Full-Polarization Observations of OH Masers in Massive Star-Forming Regions: I. Data
• Outflows from Massive YSOs as Seen with the Infrared Array Camera
• Water masers in the massive protostar IRAS 20126+4104: ejection and deceleration
• WFCAM, Spitzer-IRAC and SCUBA observations of the massive star forming region DR21/W75: II. Stellar content and star formation
• A Cluster of 1.3 cm Continuum Sources in OMC1 South
• Free-Free Spectral Energy Distributions of Hierarchically Clumped HII Regions
• First images of 6.7-GHz methanol masers in DR21(OH) and DR21(OH)N
• European VLBI Network observations of 6.7-GHz methanol masers in a candidate circumstellar disc

Cited by in corpus (29)

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• First Interferometric Images of the 36 GHz Methanol Masers in the DR21 Complex
• Millimeter multiplicity in DR21(OH): outflows, molecular cores and envelopes
• A Catalog of Methanol Masers in Massive Star-forming Regions. III. The Molecular Outflow Sample
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• X-ray embedded stars as driving sources of outflow-driven turbulence in OMC1-S
• The Zeeman Effect in the 44 GHz Class I Methanol Maser Line toward DR21(OH)
• The Herschel-HIFI view of mid-IR quiet massive protostellar objects
• A Catalog of CH_3OH 7_0-6_1 A^+ Maser Sources in Massive Star-Forming Regions. II. Masers in NGC 6334F, G8.67-0.36, and M17
• Uniform Silicon Isotope Ratios Across the Milky Way Galaxy
• New Maser Emission from Nonmetastable Ammonia in NGC 7538
• Surveys of Clumps, Cores, and Condensations in the Cygnus X: II. Radio Properties of the Massive Dense Cores
• First Interstellar HCO${}^{+}$ Maser
• SMA line observations of the CH${}_3$OH-maser outflow in DR21(OH)
• Long-term variability of Class I methanol masers in the high mass star forming region DR21(OH)
• Modelling carbon chain and complex organic molecules in the DR21(OH) clump
• Broadband VLA Spectral Line Survey of a Sample of Ionized Jet Candidates