Universität zu Köln

Zhang, Tianwei, Wu, Yuefang, Liu, Tie ORCID: 0000-0002-5286-2564 and Meng, Fanyi (2016). GAS OF 96 PLANCK COLD CLUMPS IN THE SECOND QUADRANT. Astrophys. J. Suppl. Ser., 224 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4365

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Abstract

Ninety-six Planck cold dust clumps in the second quadrant were mapped with (CO)-C-12 (1-0), (CO)-C-13 (1-0), and (CO)-O-18 (1-0) lines at the 13.7 m telescope of Purple Mountain Observatory. (CO)-C-12 (1-0) and (CO)-C-13 (1-0) emissions were detected for all 96 clumps, while (CO)-O-18. (1-0) emissions were detected in 81 of them. Fifteen clumps have more than one velocity component. In the 115 mapped velocity components, 225 cores were obtained. We found that 23.1% of the cores have non-Gaussian profiles. We acquired the V-lsr, FWHM, and T-A of the lines. Distances, T-ex, velocity dispersions, N-H2, and masses were also derived. Generally, turbulence may dominant the cores because sigma(NT)/sigma(Therm) > 1 in almost all of the cores and Larson's relationship is not apparent in our massive cores. Virial parameters are adopted to test the gravitational stability of cores and 51% of the cores are likely collapsing. The core mass function of the cores in the range 0-1 kpc suggests a low core-to-star conversional efficiency (0.62%). Only 14 of 225 cores (6.2%) have associated stellar objects at their centers, while the others are starless. The morphologies of clumps are mainly filamentary structures. Seven clumps may be located on an extension of the new spiral arm in the second quadrant while three are on the known outer arm.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Zhang, Tianwei UNSPECIFIED UNSPECIFIED UNSPECIFIED Wu, Yuefang UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Tie UNSPECIFIED orcid.org/0000-0002-5286-2564 UNSPECIFIED Meng, Fanyi UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-274283
DOI:	10.3847/0067-0049/224/2/43
Journal or Publication Title:	Astrophys. J. Suppl. Ser.
Volume:	224
Number:	2
Date:	2016
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4365
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INITIAL MASS FUNCTION; MOLECULAR CLOUDS; STAR-FORMATION; MILKY-WAY; SOLAR NEIGHBORHOOD; DENSE CORES; DARK CLOUDS; SPIRAL ARM; ORION; REGIONS Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/27428