EVIDENCE OF A CLOUD-CLOUD COLLISION FROM OVERSHOOTING GAS IN THE GALACTIC CENTER
Publisher
The University of Arizona.Rights
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.Abstract
We observed a cloud near the Galactic Center at (𝓁, b) = (+5.4, −0.4) with the ALMA/ACA. We took measurements of the spectral lines 12CO J = 2 → 1 , 13CO J = 2 → 1 , C18O J = 2 →_ 1, H2CO J = 303 → 202 , H2CO J = 322 → 221 , CH3OH J = 422 → 312 , OCS J = 18 → 17 and SiO J = 5 → 4. We observed a velocity bridge, evidence of a cloud-cloud collision, between two clouds at ~50 km s−1 and ~150 km s−1 in our position-velocity diagram. We found evidence of strong shocks due to the presence of SiO and weak shocks due to enhanced abundances of CH −1 3OH. We believe that the ~50 km s cloud came from gas which overshot the CMZ as it flowed in and that the cloud is colliding with the ~150 km s −1 cloud on the opposite side of the galaxy’s dust lane.Type
Electronic thesistext
Degree Name
B.S.Degree Level
bachelorsDegree Program
AstronomyHonors College