Planck intermediate results XXIII : Galactic plane emission components derived from Planck with ancillary data

Show simple item record Ade, P. A. R. Keihänen, E. Kurki-Suonio, H. Lähteenmäki, A. Suur-Uski, A-S. Valiviita, J. Planck Collaboration 2018-03-12T08:25:01Z 2018-03-12T08:25:01Z 2015-08
dc.identifier.citation Ade , P A R , Keihänen , E , Kurki-Suonio , H , Lähteenmäki , A , Suur-Uski , A-S , Valiviita , J & Planck Collaboration 2015 , ' Planck intermediate results XXIII : Galactic plane emission components derived from Planck with ancillary data ' , Astronomy & Astrophysics , vol. 580 , A13 .
dc.identifier.other PURE: 53926464
dc.identifier.other PURE UUID: b5732e83-740f-44d9-93e6-01a98ce5c0d5
dc.identifier.other WOS: 000360020200013
dc.identifier.other Scopus: 84937874975
dc.identifier.other ORCID: /0000-0002-4618-3063/work/29504370
dc.identifier.other ORCID: /0000-0001-5029-2863/work/40858140
dc.identifier.other ORCID: /0000-0001-6225-3693/work/28985571
dc.identifier.other ORCID: /0000-0003-1804-7715/work/38542618
dc.description.abstract Planck data when combined with ancillary data provide a unique opportunity to separate the diffuse emission components of the inner Galaxy. The purpose of the paper is to elucidate the morphology of the various emission components in the strong star-formation region lying inside the solar radius and to clarify the relationship between the various components. The region of the Galactic plane covered is 1 = 300 degrees -> 0 degrees -> 60 degrees where star-formation is highest and the emission is strong enough to make meaningful component separation. The latitude widths in this longitude range lie between 1 and 2, which correspond to FWHM z-widths of 100-200 pc at a typical distance of 6 kpc. The four emission components studied here are synchrotron, free-free, anomalous microwave emission (AME), and thermal (vibrational) dust emission. These components are identified by constructing spectral energy distributions (SEDs) at positions along the Galactic plane using the wide frequency coverage of Planck (28.4-857 GHz) in combination with low-frequency radio data at 0.408-2.3 GHz plus WMAP data at 23-94 GHz, along with far-infrared (FIR) data from COBE-DIRBE and IRAS. The free-free component is determined from radio recombination line (RRL) data. AME is found to be comparable in brightness to the free-free emission on the Galactic plane in the frequency range 20-40 GHz with a width in latitude similar to that of the thermal dust; it comprises 45 +/- 1% of the total 28.4 GHz emission in the longitude range 1 = 300 degrees -> 0 degrees -> 60 degrees. The free-free component is the narrowest, reflecting the fact that it is produced by current star-formation as traced by the narrow distribution of OB stars. It is the dominant emission on the plane between 60 and 100 GHz. RRLs from this ionized gas are used to assess its distance, leading to a free-free z-width of FWHM approximate to 100 pc. The narrow synchrotron component has a low-frequency brightness spectral index beta(synch) approximate to -2.7 that is similar to the broad synchrotron component indicating that they are both populated by the cosmic ray electrons of the same spectral index. The width of this narrow synchrotron component is significantly larger than that of the other three components, suggesting that it is generated in an assembly of older supernova remnants that have expanded to sizes of order 150 pc in 3 x 10(5) yr; pulsars of a similar age have a similar spread in latitude. The thermal dust is identified in the SEDs with average parameters of T-dust = 20.4 +/- 0.4 K, beta(FIR) = 1.94 +/- 0.03 (>353 GHz), and beta(mm) = 1.67 +/- 0.02 ( en
dc.format.extent 27
dc.language.iso eng
dc.relation.ispartof Astronomy & Astrophysics
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject ISM: general
dc.subject Galaxy: general
dc.subject radiation mechanisms: general
dc.subject radio continuum: ISM
dc.subject submillimeter: ISM
dc.subject Galaxy: disk
dc.subject MILKY-WAY
dc.subject 115 Astronomy, Space science
dc.title Planck intermediate results XXIII : Galactic plane emission components derived from Planck with ancillary data en
dc.type Article
dc.contributor.organization Department of Physics
dc.contributor.organization Helsinki Institute of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.issn 0004-6361
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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