Planck intermediate results
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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2015-10
Department
Cardiff University
University of Cambridge
International School for Advanced Studies
Université de Toulouse
Universidad de Cantabria
Istituto Nazionale di Fisica Nucleare (INFN)
University of Granada
University of Manchester
Pierre and Marie Curie University
Istituto Nazionale di Astrofisica (INAF)
University of Toronto
University of California Berkeley
University of Oxford
Telecom ParisTech
Université Grenoble Alpes
University of Paris Diderot
California Institute of Technology
Princeton University
Niels Bohr Institute, University of Copenhagen
Imperial College London
Observatoire de Paris
Sapienza University of Rome
Department of Radio Science and Engineering
University of Cambridge
International School for Advanced Studies
Université de Toulouse
Universidad de Cantabria
Istituto Nazionale di Fisica Nucleare (INFN)
University of Granada
University of Manchester
Pierre and Marie Curie University
Istituto Nazionale di Astrofisica (INAF)
University of Toronto
University of California Berkeley
University of Oxford
Telecom ParisTech
Université Grenoble Alpes
University of Paris Diderot
California Institute of Technology
Princeton University
Niels Bohr Institute, University of Copenhagen
Imperial College London
Observatoire de Paris
Sapienza University of Rome
Department of Radio Science and Engineering
Major/Subject
Mcode
Degree programme
Language
en
Pages
23
p. A28
p. A28
Series
ASTRONOMY AND ASTROPHYSICS, Volume 582, issue 1
Abstract
The Andromeda galaxy (M 31) is one of a few galaxies that has sufficient angular size on the sky to be resolved by the Planck satellite. Planck has detected M 31 in all of its frequency bands, and has mapped out the dust emission with the High Frequency Instrument, clearly resolving multiple spiral arms and sub-features. We examine the morphology of this long-wavelength dust emission as seen by Planck, including a study of its outermost spiral arms, and investigate the dust heating mechanism across M 31. We find that dust dominating the longer wavelength emission (greater than or similar to 0.3 mm) is heated by the diffuse stellar population (as traced by 3.6 mu m emission), with the dust dominating the shorter wavelength emission heated by a mix of the old stellar population and star-forming regions (as traced by 24 mu m emission). We also fit spectral energy distributions for individual 5' pixels and quantify the dust properties across the galaxy, taking into account these different heating mechanisms, finding that there is a linear decrease in temperature with galactocentric distance for dust heated by the old stellar population, as would be expected, with temperatures ranging from around 22 K in the nucleus to 14 K outside of the 10 kpc ring. Finally, we measure the integrated spectrum of the whole galaxy, which we find to be well-fitted with a global dust temperature of (18.2 +/- 1.0) K with a spectral index of 1.62 +/- 0.11 (assuming a single modified blackbody), and a significant amount of free-free emission at intermediate frequencies of 20-60 GHz, which corresponds to a star formation rate of around 0.12 M-circle dot yr(-1). We find a 2.3 sigma detection of the presence of spinning dust emission, with a 30 GHz amplitude of 0.7 +/- 0.3 Jy, which is in line with expectations from our Galaxy.Description
VK: BIBCODE: 2015A&A...582A..28P; DOI: 10.1051/0004-6361/201424643; eprintid: arXiv:1407.5452
Keywords
galaxies: individual: Messier 31, galaxies: structure, galaxies: ISM, submillimeter: galaxies, radio continuum: galaxies, MULTIBAND IMAGING PHOTOMETER, RADIO-CONTINUUM SURVEY, PRE-LAUNCH STATUS, SPITZER-SPACE-TELESCOPE, FAR-INFRARED LUMINOSITY, SPINNING DUST EMISSION, RESOLUTION IRAS MAPS, STAR-FORMATION RATES, LOCAL GROUP GALAXIES, COMPLETE CO SURVEY
Other note
Citation
Ade , P A R , Aghanim , N , Arnaud , M , Ashdown , M , Aumont , J , Baccigalupi , C , Banday , A J , Barreiro , R B , Bartolo , N , Battaner , E , Battye , R , Benabed , K , Bendo , G J , Benoit-Levy , A , Bernard , J -P , Bersanelli , M , Bielewicz , P , Bonaldi , A , Bonavera , L , Bond , J R , Borrill , J , Bouchet , F R , Burigana , C , Butler , R C , Calabrese , E , Cardoso , J -F , Catalano , A , Chamballu , A , Chary , R -R , Chen , X , Chiang , H C , Christensen , P R , Clements , D L , Colombo , L P L , Combet , C , Couchot , F , Coulais , A , Crill , B P , Curto , A , Cuttaia , F , Danese , L , Davies , R D , Davis , R J , de Bernardis , P , de Rosa , A , de Zotti , G , Delabrouille , J , Dickinson , C , Diego , J M , Lähteenmäki , A & Planck Collaboration 2015 , ' Planck intermediate results : XXV. The Andromeda galaxy as seen by Planck ' , Astronomy and Astrophysics , vol. 582 , no. 1 , 28 , pp. p. A28 . https://doi.org/10.1051/0004-6361/201424643