Herschel and SCUBA-2 observations of dust emission in a sample of Planck cold clumps - Archive ouverte HAL Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2018

Herschel and SCUBA-2 observations of dust emission in a sample of Planck cold clumps

, , , , , , , , , , , , , , (1) , (2) , , , , (2) , , , , , , , , ,
1
2
Mika Juvela
  • Function : Author
Jinhua He
  • Function : Author
Katherine Pattle
  • Function : Author
Tie Liu
  • Function : Author
George Bendo
  • Function : Author
David J. Eden
  • Function : Author
Orsolya Fehér
  • Function : Author
Fich Michel
  • Function : Author
Gary Fuller
  • Function : Author
Naomi Hirano
  • Function : Author
Kee-Tae Kim
  • Function : Author
Di Li
  • Function : Author
Sheng-Yuan Liu
  • Function : Author
Johanna Malinen
  • Function : Author
Harriet Parsons
  • Function : Author
Veli-Matti Pelkonen
  • Function : Author
Mark G. Rawlings
  • Function : Author
Manash R. Samal
  • Function : Author
Ken'Ichi Tatematsu
  • Function : Author
Mark Thompson
  • Function : Author
Alessio Traficante
  • Function : Author
Ke Wang
  • Function : Author
Derek Ward-Thompson
  • Function : Author
Yuefang Wu
  • Function : Author
Hee-Weon Yi
  • Function : Author
Hyunju Yoo
  • Function : Author

Abstract

Context. Analysis of all-sky Planck submillimetre observations and the IRAS 100 μm 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 μm 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 TC 14-18 K and opacity spectral index values of β = 1.5-1.9. The clumps and cores identified in SCUBA-2 maps have T 13 K and similar β values. There are some indications of the dust emission spectrum becoming flatter at wavelengths longer than 500 μm. 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 β value that is slightly above 1.8. In the joint SPIRE and SCUBA-2 850 μm fits, the value decreases to β 1.6. Most of the observed T-β anticorrelation can be explained by noise.
Conclusions: The typical submillimetre opacity spectral index β of cold clumps is found to be 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-β anticorrelation and β decreasing at millimetre wavelengths.

Planck (http://www.esa.int/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.

Fichier principal
Vignette du fichier
aa31921-17.pdf (13.51 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03746205 , version 1 (05-08-2022)

Identifiers

Cite

Mika Juvela, Jinhua He, Katherine Pattle, Tie Liu, George Bendo, et al.. Herschel and SCUBA-2 observations of dust emission in a sample of Planck cold clumps. Astronomy and Astrophysics - A&A, 2018, 612, ⟨10.1051/0004-6361/201731921⟩. ⟨insu-03746205⟩
8 View
1 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More