The Effect of Star Formation on the Far-Infrared-Radio Correlation within Galaxies | Zendy

E. J. Murphy | Zendy; G. Hélou | Zendy; Róbert Braun | Zendy; Jeffrey D. P. Kenney | Zendy; L. Armus | Zendy; Daniela Calzetti | Zendy; B. T. Draine | Zendy; R. C. Kennicutt | Zendy; H. Roussel | Zendy; Fabian Walter | Zendy; G. J. Bendo | Zendy; B. Buckalew | Zendy; Daniel A. Dale | Zendy; C. W. Engelbracht | Zendy; J. D. Smith | Zendy; M. D. Thornley | Zendy

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The Effect of Star Formation on the Far-Infrared-Radio Correlation within Galaxies

Author(s) -

E. J. Murphy,

G. Hélou,

Róbert Braun,

Jeffrey D. P. Kenney,

L. Armus,

Daniela Calzetti,

B. T. Draine,

R. C. Kennicutt,

H. Roussel,

Fabian Walter,

G. J. Bendo,

B. Buckalew,

Daniel A. Dale,

C. W. Engelbracht,

J. D. Smith,

M. D. Thornley

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/509722

Subject(s) - physics , astrophysics , radio galaxy , astronomy , galaxy , luminous infrared galaxy , surface brightness , star formation , infrared , far infrared , supernova

Using data obtained for twelve galaxies as part of the {\it Spitzer} InfraredNearby Galaxies Survey (SINGS) and the Westerbork Synthesis Radio Telescope(WSRT)-SINGS radio continuum survey, we study how star formation activityaffects the far-infrared (FIR)--radio correlation {\it within} galaxies bytesting a phenomenological model, which describes the radio image as a smearedversion of the FIR image. The physical basis of this description is thatcosmic-ray (CR) electrons will diffuse measurably farther than the mean freepath of dust-heating photons before decaying by synchrotron radiation. Thisdescription works well in general. Galaxies with higher infrared surfacebrightnesses have best-fit smoothing scale-lengths of a few hundred parsecs,substantially shorter than those for lower surface brightness galaxies. Weinterpret this result to suggest that galaxies with higher disk averaged starformation rates have had a recent episode of enhanced star formation and arecharacterized by a higher fraction of young CR electrons that have traveledonly a few hundred parsecs from their acceleration sites in supernova remnantscompared to galaxies with lower star formation activity.Comment: 5 pages, 3 figures; Accepted for publication in ApJ Letter

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