Universität zu Köln

Juvela, Mika ORCID: 0000-0002-5809-4834, He, Jinhua, Pattle, Katherine, Liu, Tie ORCID: 0000-0002-5286-2564, Bendo, George, Eden, David J., Feher, Orsolya, Fich, Michel, Fuller, Gary ORCID: 0000-0001-8509-1818, Hirano, Naomi ORCID: 0000-0001-9304-7884, Kim, Kee-Tae, Li, Di ORCID: 0000-0003-3010-7661, Liu, Sheng-Yuan ORCID: 0000-0003-4603-7119, Malinen, Johanna, Marshall, Douglas J., Paradis, Deborah, Parsons, Harriet, Pelkonen, Veli-Matti ORCID: 0000-0002-8898-1047, Rawlings, Mark G., Ristorcelli, Isabelle, Samal, Manash R., Tatematsu, Ken'ichi, Thompson, Mark, Traficante, Alessio ORCID: 0000-0003-1665-6402, Wang, Ke, Ward-Thompson, Derek ORCID: 0000-0003-1140-2761, Wu, Yuefang, Yi, Hee-Weon and Yoo, Hyunju (2018). Herschel and SCUBA-2 observations of dust emission in a sample of Planck cold clumps. Astron. Astrophys., 612. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Context. Analysis of all-sky Planck submillimetre observations and the IRAS 100 mu m data has led to the detection of a population of Galactic cold clumps. The clumps can be used to study star formation and dust properties in a wide range of Galactic environments. Aims. Our aim is to measure dust spectral energy distribution ( SED) variations as a function of the spatial scale and the wavelength. Methods. We examined the SEDs at large scales using IRAS, Planck, and Herschel data. At smaller scales, we compared JCMT/SCUBA-2 850 mu m maps with Herschel data that were filtered using the SCUBA-2 pipeline. Clumps were extracted using the Fellwalker method, and their spectra were modelled as modified blackbody functions. Results. According to IRAS and Planck data, most fields have dust colour temperatures T-C similar to 14-18K and opacity spectral index values of beta = 1.5-1.9. The clumps and cores identified in SCUBA-2 maps have T similar to 13K and similar beta values. There are some indications of the dust emission spectrum becoming flatter at wavelengths longer than 500 mu m. In fits involving Planck data, the significance is limited by the uncertainty of the corrections for CO line contamination. The fits to the SPIRE data give a median beta value that is slightly above 1.8. In the joint SPIRE and SCUBA-2 850 mu m fits, the value decreases to beta similar to 1.6. Most of the observed T-beta anticorrelation can be explained by noise. Conclusions. The typical submillimetre opacity spectral index fi of cold clumps is found to be similar to 1.7. This is above the values of diffuse clouds, but lower than in some previous studies of dense clumps. There is only tentative evidence of a T-beta anticorrelation and beta decreasing at millimetre wavelengths.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Juvela, Mika UNSPECIFIED orcid.org/0000-0002-5809-4834 UNSPECIFIED He, Jinhua UNSPECIFIED UNSPECIFIED UNSPECIFIED Pattle, Katherine UNSPECIFIED UNSPECIFIED UNSPECIFIED Liu, Tie UNSPECIFIED orcid.org/0000-0002-5286-2564 UNSPECIFIED Bendo, George UNSPECIFIED UNSPECIFIED UNSPECIFIED Eden, David J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Feher, Orsolya UNSPECIFIED UNSPECIFIED UNSPECIFIED Fich, Michel UNSPECIFIED UNSPECIFIED UNSPECIFIED Fuller, Gary UNSPECIFIED orcid.org/0000-0001-8509-1818 UNSPECIFIED Hirano, Naomi UNSPECIFIED orcid.org/0000-0001-9304-7884 UNSPECIFIED Kim, Kee-Tae UNSPECIFIED UNSPECIFIED UNSPECIFIED Li, Di UNSPECIFIED orcid.org/0000-0003-3010-7661 UNSPECIFIED Liu, Sheng-Yuan UNSPECIFIED orcid.org/0000-0003-4603-7119 UNSPECIFIED Malinen, Johanna UNSPECIFIED UNSPECIFIED UNSPECIFIED Marshall, Douglas J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Paradis, Deborah UNSPECIFIED UNSPECIFIED UNSPECIFIED Parsons, Harriet UNSPECIFIED UNSPECIFIED UNSPECIFIED Pelkonen, Veli-Matti UNSPECIFIED orcid.org/0000-0002-8898-1047 UNSPECIFIED Rawlings, Mark G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ristorcelli, Isabelle UNSPECIFIED UNSPECIFIED UNSPECIFIED Samal, Manash R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tatematsu, Ken'ichi UNSPECIFIED UNSPECIFIED UNSPECIFIED Thompson, Mark UNSPECIFIED UNSPECIFIED UNSPECIFIED Traficante, Alessio UNSPECIFIED orcid.org/0000-0003-1665-6402 UNSPECIFIED Wang, Ke UNSPECIFIED UNSPECIFIED UNSPECIFIED Ward-Thompson, Derek UNSPECIFIED orcid.org/0000-0003-1140-2761 UNSPECIFIED Wu, Yuefang UNSPECIFIED UNSPECIFIED UNSPECIFIED Yi, Hee-Weon UNSPECIFIED UNSPECIFIED UNSPECIFIED Yoo, Hyunju UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-188965
DOI:	10.1051/0004-6361/201731921
Journal or Publication Title:	Astron. Astrophys.
Volume:	612
Date:	2018
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TEMPERATURE-DEPENDENCE; SPECTRAL INDEX; DARK CLOUDS; DENSE CORES; JCMT; CATALOG; MASSES; NOISE; FIELD Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/18896