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Galactic cold cores. III. General cloud properties

Juvela, M. and Ristorcelli, I. and Pagani, L. and Doi, Y. and Pelkonen, V.-M. and Marshall, D. J. and Bernard, J.-P. and Falgarone, E. and Malinen, J. and Marton, G. and McGehee, P. and Montier, L. A. and Motte, F. and Paladini, R. and Tóth, L. V. and Ysard, N. and Zahorecz, S. and Zavagno, A. (2012) Galactic cold cores. III. General cloud properties. Astronomy and Astrophysics, 541 . Art. No. A12. ISSN 0004-6361. doi:10.1051/0004-6361/201118640.

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Context. In the project galactic cold cores we are carrying out Herschel photometric observations of cold regions of the interstellar clouds as previously identified with the Planck satellite. The aim of the project is to derive the physical properties of the population of cold clumps and to study its connection to ongoing and future star formation. Aims. We examine the cloud structure around the Planck detections in 71 fields observed with the Herschel SPIRE instrument by the summer of 2011. We wish to determine the general physical characteristics of the fields and to examine the morphology of the clouds where the cold high column density clumps are found. Methods. Using the Herschel SPIRE data, we derive colour temperature and column density maps of the fields. Together with ancillary data, we examine the infrared spectral energy distributions of the main clumps. The clouds are categorised according to their large scale morphology. With the help of recently released WISE satellite data, we look for signs of enhanced mid-infrared scattering (“coreshine”), an indication of growth of the dust grains, and have a first look at the star formation activity associated with the cold clumps. Results. The mapped clouds have distances ranging from ∼100 pc to several kiloparsecs and cover a range of sizes and masses from cores of less than 10 M_⊙ to clouds with masses in excess of 10 000 M_⊙. Most fields contain some filamentary structures and in about half of the cases a filament or a few filaments dominate the morphology. In one case out of ten, the clouds show a cometary shape or have sharp boundaries indicative of compression by an external force. The width of the filaments is typically ∼0.2–0.3 pc. However, there is significant variation from 0.1 pc to 1 pc and the estimates are sensitive to the methods used and the very definition of a filament. Enhanced mid-infrared scattering, coreshine, was detected in four clouds with six additional tentative detections. The cloud LDN183 is included in our sample and remains the best example of this phenomenon. About half of the fields are associated with active star formation as indicated by the presence of mid-infrared point sources. The mid-infrared sources often coincide with structures whose sub-millimetre spectra are still dominated by the cold dust.

Item Type:Article
Related URLs:
URLURL TypeDescription
Pelkonen, V.-M.0000-0002-8898-1047
McGehee, P.0000-0003-0948-6716
Paladini, R.0000-0002-5158-243X
Additional Information:© 2012 ESO. Received 14 December 2011; Accepted 7 February 2012; Published 19 April 2012. Planck ( is a project of the European Space Agency – ESA – with instruments provided by two scientific consortia funded by ESA member states (in particular the lead countries: France and Italy) with contributions from NASA (USA), and telescope reflectors provided in a collaboration between ESA and a scientific consortium led and funded by Denmark. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. M.J., J.M. and N.Y. acknowledge the support of the Academy of Finland Grants Nos. 127015 and 250741. N.Y. acknowledges the support of a CNES post-doctoral research grant. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This research is based in part on observations with AKARI, a JAXA project with the participation of ESA.
Funding AgencyGrant Number
Academy of Finland127015
Academy of Finland250741
Centre National d'Études Spatiales (CNES) (France)UNSPECIFIED
Subject Keywords:ISM: clouds; infrared: ISM; submillimeter: ISM; dust, extinction; stars: formation; stars: protostars
Record Number:CaltechAUTHORS:20120625-162151474
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Official Citation:Galactic cold cores - III. General cloud properties M. Juvela, I. Ristorcelli, L. Pagani, Y. Doi, V.-M. Pelkonen, D. J. Marshall, J.-P. Bernard, E. Falgarone, J. Malinen, G. Marton, P. McGehee, L. A. Montier, F. Motte, R. Paladini, L. V. Tóth, N. Ysard, S. Zahorecz and A. Zavagno A&A 541 A12 (2012) DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32073
Deposited By: Aucoeur Ngo
Deposited On:26 Jun 2012 14:52
Last Modified:09 Nov 2021 20:03

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