ALMA Observations of Starless Core Substructure in Ophiuchus

H. Kirk, M. M. Dunham, J. Di Francesco, D. Johnstone, S. S.R. Offner, S. I. Sadavoy, J. J. Tobin, H. G. Arce, T. L. Bourke, S. Mairs, P. C. Myers, J. E. Pineda, S. Schnee, Y. L. Shirley

Research output: Research - peer-reviewArticle

Abstract

Compact substructure is expected to arise in a starless core as mass becomes concentrated in the central region likely to form a protostar. Additionally, multiple peaks may form if fragmentation occurs. We present Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 2 observations of 60 starless and protostellar cores in the Ophiuchus molecular cloud. We detect eight compact substructures which are from the nearest Spitzer young stellar object. Only one of these has strong evidence for being truly starless after considering ancillary data, e.g., from Herschel and X-ray telescopes. An additional extended emission structure has tentative evidence for starlessness. The number of our detections is consistent with estimates from a combination of synthetic observations of numerical simulations and analytical arguments. This result suggests that a similar ALMA study in the Chamaeleon I cloud, which detected no compact substructure in starless cores, may be due to the peculiar evolutionary state of cores in that cloud.

LanguageEnglish (US)
Article number114
JournalAstrophysical Journal
Volume838
Issue number2
DOIs
StatePublished - Apr 1 2017

Fingerprint

substructures
fragmentation
simulation
young
detection
protostars
molecular clouds
telescopes
cycles
estimates
x rays

Keywords

  • Stars: formation
  • submillimeter: ISM

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Kirk, H., Dunham, M. M., Francesco, J. D., Johnstone, D., Offner, S. S. R., Sadavoy, S. I., ... Shirley, Y. L. (2017). ALMA Observations of Starless Core Substructure in Ophiuchus. Astrophysical Journal, 838(2), [114]. DOI: 10.3847/1538-4357/aa63f8

ALMA Observations of Starless Core Substructure in Ophiuchus. / Kirk, H.; Dunham, M. M.; Francesco, J. Di; Johnstone, D.; Offner, S. S.R.; Sadavoy, S. I.; Tobin, J. J.; Arce, H. G.; Bourke, T. L.; Mairs, S.; Myers, P. C.; Pineda, J. E.; Schnee, S.; Shirley, Y. L.

In: Astrophysical Journal, Vol. 838, No. 2, 114, 01.04.2017.

Research output: Research - peer-reviewArticle

Kirk, H, Dunham, MM, Francesco, JD, Johnstone, D, Offner, SSR, Sadavoy, SI, Tobin, JJ, Arce, HG, Bourke, TL, Mairs, S, Myers, PC, Pineda, JE, Schnee, S & Shirley, YL 2017, 'ALMA Observations of Starless Core Substructure in Ophiuchus' Astrophysical Journal, vol 838, no. 2, 114. DOI: 10.3847/1538-4357/aa63f8
Kirk H, Dunham MM, Francesco JD, Johnstone D, Offner SSR, Sadavoy SI et al. ALMA Observations of Starless Core Substructure in Ophiuchus. Astrophysical Journal. 2017 Apr 1;838(2). 114. Available from, DOI: 10.3847/1538-4357/aa63f8
Kirk, H. ; Dunham, M. M. ; Francesco, J. Di ; Johnstone, D. ; Offner, S. S.R. ; Sadavoy, S. I. ; Tobin, J. J. ; Arce, H. G. ; Bourke, T. L. ; Mairs, S. ; Myers, P. C. ; Pineda, J. E. ; Schnee, S. ; Shirley, Y. L./ ALMA Observations of Starless Core Substructure in Ophiuchus. In: Astrophysical Journal. 2017 ; Vol. 838, No. 2.
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