Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:1105.6336)
· References in the article
· Citations to the Article (5) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (9)
· NED Objects (3)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Radio to infrared spectra of late-type galaxies with Planck and Wilkinson Microwave Anisotropy Probe data
Authors:
Peel, M. W.; Dickinson, C.; Davies, R. D.; Clements, D. L.; Beswick, R. J.
Affiliation:
AA(Jodrell Bank Centre for Astrophysics, Alan Turing Building, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL), AB(Jodrell Bank Centre for Astrophysics, Alan Turing Building, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL), AC(Jodrell Bank Centre for Astrophysics, Alan Turing Building, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL), AD(Imperial College London, Astrophysics Group, Blackett Laboratory, Prince Consort Road, London SW7 2AZ), AE(Jodrell Bank Centre for Astrophysics, Alan Turing Building, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL)
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 416, Issue 1, pp. L99-L103. (MNRAS Homepage)
Publication Date:
09/2011
Origin:
WILEY
Astronomy Keywords:
galaxies: individual: M82, galaxies: individual: NGC 253, galaxies: individual: NGC 4945, galaxies: starburst, radio continuum: galaxies, submillimetre: galaxies
Abstract Copyright:
© 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS
DOI:
10.1111/j.1745-3933.2011.01108.x
Bibliographic Code:
2011MNRAS.416L..99P

Abstract

We use the Planck Early Release Compact Source Catalogue combined with Wilkinson Microwave Anisotropy Probe (WMAP) and other archival measurements to construct continuum spectra of three nearby dusty star-forming galaxies: Messier 82, NGC 253 and NGC 4945. We carry out a least-squares fit to the spectra using a combination of simple synchrotron, free-free and thermal dust models, and look for evidence of anomalous microwave emission (AME). We find that the radio spectra of all three galaxies are consistent with steep spectrum synchrotron emission, with a significant amount of free-free emission required to explain the Planck and WMAP data points in the frequency range 30-150 GHz. This brings the star formation rate based on free-free emission into better agreement with that from the non-thermal emission. We place limits on the presence of AME in these galaxies, finding that it is lower than expectations based on the ratio of far-infrared to AME from the Galaxy. Nevertheless, the shape of the spectrum of NGC 4945 hints at the presence of AME with a peak around 30 GHz. Future Planck data will let us look more closely at these galaxies, as well as to extend the analysis to many more galaxies.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
  New!

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints