CO J=2-1 and CO J=3-2 observations toward the high-mass protostellar candidate IRAS 20188+3928

Abstract

We have carried out 12CO J=2-1 and 12CO J=3-2 observations toward the high-mass protostellar candidate IRAS 20188+3928. Compared with previous observations, the 12CO J=2-1 and 12CO J=3-2 lines both have asymmetric profiles with an absorption dip. The velocity of the absorption dip is 1.0 km/s. The spectral shape may be caused by rotation. The velocity-integrated intensity map and position-velocity diagram of the 12CO J=2-1 line present an obvious bipolar component, further verifying that this region has an outflow motion. This region is also associated with an HII region, an IRAS source, and an H2O maser. The H2O maser has the velocity of 1.1 km/s. Compared with the components of the outflow, we find that the H2O maser is not associated with the outflow. Using the large velocity gradient model, we concluded that possible averaged gas densities of the blueshifted lobe and redshifted lobe are 1.0*10^{5}$c{m}^{-3}and2.0\ast 10$^{4} cm^{-3}, while kinetic temperatures are 26.9 K and 52.9 K, respectively. Additionally, the outflow has {a} higher integrated intensity ratio (I_{CO J=3-2}/I_{CO J=2-1}).

8 pages, 5 figures, Accepted by Research in Astronomy and Astrophysics

References in corpus (5)

• Massive molecular outflows associated with UCHII/HII regions
• Infall and Outflow of Molecular Gas in Sgr B2
• Star Formation Associated With the SNR IC443
• Submillimeter/millimeter observations of the molecular clouds associated with the Tycho' Supernova Remnant
• The open cluster NGC6823 and possible triggered star formation associated with SNR G59.5+0.1

Cited by in corpus (1)

• Methanol Maser Associated Outflows: Detection statistics and properties