Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-01-21
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Scientific paper
We mapped the MSX dark cloud G084.81-01.09 in the NH3 (1,1) - (4,4) lines and in the J = 1-0 transitions of 12CO, 13CO, C18O and HCO+ in order to study the physical properties of infrared dark clouds, and to better understand the initial conditions for massive star formation. Six ammonia cores are identified with masses ranging from 60 to 250 M_sun, a kinetic temperature of 12 K, and a molecular hydrogen number density n(H2) ~ 10^5 cm^-3. In our high mass cores, the ammonia line width of 1 km/s is larger than those found in lower mass cores but narrower than the more evolved massive ones. We detected self-reversed profiles in HCO+ across the northern part of our cloud and velocity gradients in different molecules. These indicate an expanding motion in the outer layer and more complex motions of the clumps more inside our cloud. We also discuss the millimeter wave continuum from the dust. These properties indicate that our cloud is a potential site of massive star formation but is still in a very early evolutionary stage.
Henkel Carsten
Menten Karl. M.
Pandian Jagadheep D.
Xu Yadong
Yang Jaek-Jin
No associations
LandOfFree
Early phase of massive star formation: A case study of Infrared dark cloud G084.81-01.09 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Early phase of massive star formation: A case study of Infrared dark cloud G084.81-01.09, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Early phase of massive star formation: A case study of Infrared dark cloud G084.81-01.09 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-18704