English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Velocity-coherent filaments in NGC 1333: Evidence for accretion flow?

Chen, M.-C.-Y., Francesco, J. D., Rosolowsky, E., Keown, J., Pineda, J. E., Friesen, R. K., et al. (2020). Velocity-coherent filaments in NGC 1333: Evidence for accretion flow? The Astrophysical Journal, 831(1): 84. doi:10.3847/1538-4357/ab7378.

Item is

Files

show Files
hide Files
:
Velocity-coherent Filaments in NGC 1333 Evidence for Accretion Flow.pdf (Any fulltext), 2MB
 
File Permalink:
-
Name:
Velocity-coherent Filaments in NGC 1333 Evidence for Accretion Flow.pdf
Description:
-
OA-Status:
Visibility:
Private
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Chen, Michael Chun-Yuan, Author
Francesco, James Di, Author
Rosolowsky, Erik, Author
Keown, Jared, Author
Pineda, Jaime E.1, Author           
Friesen, Rachel K., Author
Caselli, Paola1, Author           
Chen, How-Huan, Author
Matzner, Christopher D., Author
Offner, Stella S., Author
Punanova, Anna, Author
Redaelli, Elena1, Author           
Scibelli, Samantha, Author
Shirley, Yancy, Author
Affiliations:
1Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society, ou_1950287              

Content

show
hide
Free keywords: -
 Abstract: Recent observations of global velocity gradients across and along molecular filaments have been interpreted as signs of gas accreting onto and along these filaments, potentially feeding star-forming cores and protoclusters. The behavior of velocity gradients in filaments, however, has not been studied in detail, particularly on small scales (<0.1 pc). In this paper, we present MUFASA, an efficient, robust, and automatic method to fit ammonia lines with multiple velocity components, generalizable to other molecular species. We also present CRISPy, a Python package to identify filament spines in 3D images (e.g., position–position–velocity cubes), along with a complementary technique to sort fitted velocity components into velocity-coherent filaments. In NGC 1333, we find a wealth of velocity gradient structures on a beam-resolved scale of ~0.05 pc. Interestingly, these local velocity gradients are not randomly oriented with respect to filament spines and their perpendicular, i.e., radial, component decreases in magnitude toward the spine for many filaments. Together with remarkably constant velocity gradients on larger scales along many filaments, these results suggest a scenario in which gas falling onto filaments is progressively damped and redirected to flow along these filaments.

Details

show
hide
Language(s):
 Dates: 2020-03-06
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.3847/1538-4357/ab7378
Other: LOCALID: 3223875
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: The Astrophysical Journal
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 831 (1) Sequence Number: 84 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3