Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/31459
Title: | An Ordered Envelope-Disk Transition in the Massive Protostellar Source G339.88-1.26 | Authors: | Zhang, Yichen Tan, Jonathan C. Sakai, Nami Tanaka, Kei E. I. De Buizer, James M. Liu, Mengyao BELTRAN SOROLLA, MARIA TERESA Kratter, Kaitlin Mardones, Diego Garay, Guido |
Issue Date: | 2019 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 873 | Issue: | 1 | First Page: | 73 | Abstract: | We report molecular line observations of the massive protostellar source G339.88-1.26 with the Atacama Large Millimeter/Submillimeter Array. The observations reveal a highly collimated SiO jet extending from the 1.3 mm continuum source, which connects to a slightly wider but still highly collimated CO outflow. Rotational features perpendicular to the outflow axis are detected in various molecular emissions, including SiO, SO<SUB>2</SUB>, H<SUB>2</SUB>S, CH<SUB>3</SUB>OH, and H<SUB>2</SUB>CO emissions. Based on their spatial distributions and kinematics, we find that they trace different parts of the envelope-disk system. The SiO emission traces the disk and inner envelope in addition to the jet. The CH<SUB>3</SUB>OH and H<SUB>2</SUB>CO emissions mostly trace the infalling-rotating envelope and are enhanced around the transition region between envelope and disk, i.e., the centrifugal barrier. The SO<SUB>2</SUB> and H<SUB>2</SUB>S emissions are enhanced around the centrifugal barrier and also trace the outer part of the disk. Envelope kinematics are consistent with rotating-infalling motion, while those of the disk are consistent with Keplerian rotation. The radius and velocity of the centrifugal barrier are estimated to be about 530 au and 6 {km} {{{s}}}<SUP>-1</SUP>, respectively, leading to a central mass of about 11 M <SUB>☉</SUB>, consistent with estimates based on spectral energy distribution fitting. These results indicate that an ordered transition from an infalling-rotating envelope to a Keplerian disk through a centrifugal barrier, accompanied by changes of types of molecular line emissions, is a valid description of this massive protostellar source. This implies that at least some massive stars form in a similar way to low-mass stars via core accretion. | URI: | http://hdl.handle.net/20.500.12386/31459 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/ab0553 | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/ab0553 | Bibcode ADS: | 2019ApJ...873...73Z | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Zhang_2019_ApJ_873_73-compr.pdf | Pdf editoriale | 8.79 MB | Adobe PDF | View/Open |
Page view(s)
24
checked on Sep 11, 2024
Download(s)
10
checked on Sep 11, 2024
Google ScholarTM
Check
Altmetric
Altmetric
Items in DSpace are published in Open Access, unless otherwise indicated.