Revising the kinematics of 12GHz CH3OH masers in W3(OH)

Details Revising the kinematics of 12GHz CH3OH masers in W3(OH) Revising the kinematics of 12GHz CH3OH masers in W3(OH)

2010-04-28

arxiv.org/abs/1004.5033v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

32 pages, 10 figures; accepted in ApJ (Main Journal)

Scientific paper

We derive accurate proper motions of the CH3OH 12 GHz masers towards the W3(OH) UCHII region, employing seven epochs of VLBA observations spanning a time interval of about 10 yr. The achieved velocity accuracy is of the order of 0.1 km/s, adequate to precisely measure the relative velocities of most of the 12 GHz masers in W3(OH), with amplitude varying in the range 0.3 - 3 km/s. Towards W3(OH), the most intense 12 GHz masers concentrate in a small area towards the north (the northern clump) of the UCHII region. We have compared the proper motions of the CH3OH 12 GHz masers with those (derived from literature data) of the OH 6035 MHz masers, emitting from the same region of the methanol masers. In the northern clump, the two maser emissions emerge from nearby (but likely distinct) cloudlets of masing gas with, in general, a rather smooth variation of line-of-sight and sky-projected velocities, which suggests some connection of the environments and kinematics traced by both maser types. The conical outflow model, previously proposed to account for the 12 GHz maser kinematics in the northern clump, does not reproduce the new, accurate measurements of 12 GHz maser proper motions and has to be rejected. We focus on the subset of 12 GHz masers of the northern clump belonging to the "linear structure at P.A. = 130-140 degree", whose regular variation of LSR velocities with position presents evidence for some ordered motion. We show that the 3-dimensional velocities of this "linear distribution" of 12GHz masers can be well fitted considering a flat, rotating disk, seen almost edge-on.

Affiliated with

Also associated with

No associations

Rating

Revising the kinematics of 12GHz CH3OH masers in W3(OH) 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 Revising the kinematics of 12GHz CH3OH masers in W3(OH), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Revising the kinematics of 12GHz CH3OH masers in W3(OH) will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-68954