Universität zu Köln

Schmiedeke, Anika ORCID: 0000-0002-1730-8832, Pineda, Jaime E., Caselli, Paola, Arce, Hector G., Fuller, Gary A., Goodman, Alyssa A., Maureira, Maria Jose ORCID: 0000-0002-7026-8163, Offner, Stella S. R., Segura-Cox, Dominique ORCID: 0000-0003-3172-6763 and Seifried, Daniel (2021). Dissecting the Supercritical Filaments Embedded in the 0.5 pc Subsonic Region of Barnard 5. Astrophys. J., 909 (1). BRISTOL: IOP Publishing Ltd. ISSN 1538-4357

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Abstract

We characterize in detail the two similar to 0.3 pc long filamentary structures found within the subsonic region of Barnard 5. We use combined Robert C. Byrd Green Bank Telescope and Very Large Array observations of the molecular lines NH3(1,1) and (2,2) at a resolution of 1800 au, as well as James Clerk Maxwell Telescope continuum observations at 850 and 450 mu m at a resolution of 4400 and 3000 au, respectively. We find that both filaments are highly supercritical with a mean mass per unit length, M/L, of similar to 80 M pc(-1) after background subtraction, with local increases reaching values of similar to 150 M pc(-1). This would require a magnetic field strength of similar to 500 mu G to be stable against radial collapse. We extract equidistant cuts perpendicular to the spine of the filament and fit a modified Plummer profile as well as a Gaussian to each of the cuts. The filament widths (deconvolved FWHM) range between 6500 and 7000 au (similar to 0.03 pc) along the filaments. This equals similar to twice the radius of the flat inner region. We find an anticorrelation between the central density and this flattening radius, suggestive of contraction. Further, we also find a strong correlation between the power-law exponent at large radii and the flattening radius. We note that the measurements of these three parameters fall in a plane and derive their empirical relation. Our high-resolution observations provide direct constraints on the distribution of the dense gas within supercritical filaments showing pre- and protostellar activity.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schmiedeke, Anika UNSPECIFIED orcid.org/0000-0002-1730-8832 UNSPECIFIED Pineda, Jaime E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Caselli, Paola UNSPECIFIED UNSPECIFIED UNSPECIFIED Arce, Hector G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fuller, Gary A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Goodman, Alyssa A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Maureira, Maria Jose UNSPECIFIED orcid.org/0000-0002-7026-8163 UNSPECIFIED Offner, Stella S. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Segura-Cox, Dominique UNSPECIFIED orcid.org/0000-0003-3172-6763 UNSPECIFIED Seifried, Daniel UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-598585
DOI:	10.3847/1538-4357/abd6ef
Journal or Publication Title:	Astrophys. J.
Volume:	909
Number:	1
Date:	2021
Publisher:	IOP Publishing Ltd
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language VELOCITY-COHERENT FILAMENTS; STAR-FORMING FILAMENTS; JCMT BISTRO SURVEY; DENSE CORES; MOLECULAR CLOUDS; MAGNETIC-FIELD; DARK CLOUDS; INITIAL CONDITIONS; HELICAL FIELDS; PYTHON PACKAGE Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59858