Herschel and SCUBA-2 observations of dust emission in a sample of Planck cold clumps - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2018

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

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

Résumé

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
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

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

Identifiants

Citer

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⟩
18 Consultations
4 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More