Infrared Spectral Energy Distributions of Nearby Galaxies | Zendy

Daniel A. Dale | Zendy; G. J. Bendo | Zendy; C. W. Engelbracht | Zendy; Karl D. Gordon | Zendy; Michael W. Regan | Zendy; L. Armus | Zendy; John M. Can | Zendy; Daniela Calzetti | Zendy; B. T. Draine | Zendy; G. Hélou | Zendy; R. D. Joseph | Zendy; Robert C. Kennicutt | Zendy; Aigen Li | Zendy; E. J. Murphy | Zendy; H. Roussel | Zendy; Fabian Walter | Zendy; Heather Hanson | Zendy; D. J. Hollenbach | Zendy; T. H. Jarrett | Zendy; Lisa J. Kewley | Zendy; Christine Lamanna | Zendy; Claus Leitherer | Zendy; M. Meyer | Zendy; G. H. Rieke | Zendy; Marcia Rieke | Zendy; Kartik Sheth | Zendy; J. D. Smith | Zendy; M. D. Thornley | Zendy

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Infrared Spectral Energy Distributions of Nearby Galaxies

Author(s) -

Daniel A. Dale,

G. J. Bendo,

C. W. Engelbracht,

Karl D. Gordon,

Michael W. Regan,

L. Armus,

John M. Can,

Daniela Calzetti,

B. T. Draine,

G. Hélou,

R. D. Joseph,

Robert C. Kennicutt,

Aigen Li,

E. J. Murphy,

H. Roussel,

Fabian Walter,

Heather Hanson,

D. J. Hollenbach,

T. H. Jarrett,

Lisa J. Kewley,

Christine Lamanna,

Claus Leitherer,

M. Meyer,

G. H. Rieke,

Marcia Rieke,

Kartik Sheth,

J. D. Smith,

M. D. Thornley

Publication year - 2005

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 - 10.1086/491642

Subject(s) - physics , astrophysics , galaxy , star formation , astronomy , redshift , active galactic nucleus , infrared , luminous infrared galaxy , hubble sequence

The Spitzer Infrared Nearby Galaxies Survey (SINGS) is carrying out acomprehensive multi-wavelength survey on a sample of 75 nearby galaxies. The1-850um spectral energy distributions are presented using broadband imagingdata from Spitzer, 2MASS, ISO, IRAS, and SCUBA. The infrared colors derivedfrom the globally-integrated Spitzer data are generally consistent with theprevious generation of models that were developed based on global data fornormal star-forming galaxies, though significant deviations are observed.Spitzer's excellent sensitivity and resolution also allow a detailedinvestigation of the infrared spectral energy distributions for variouslocations within the three large, nearby galaxies NGC3031 (M81), NGC5194 (M51),and NGC7331. Strong correlations exist between the local star formation rateand the infrared colors f_nu(70um)/f_nu(160um) and f_nu(24um)/f_nu(160um),suggesting that the 24 and 70um emission are useful tracers of the local starformation activity level. Preliminary evidence indicates that variations in the24um emission, and not variations in the emission from polycyclic aromatichydrocarbons at 8um, drive the variations in the f_nu(8.0um)/f_nu(24um) colorswithin NGC3031, NGC5194, and NGC7331. If the galaxy-to-galaxy variations inspectral energy distributions seen in our sample are representative of therange present at high redshift then extrapolations of total infraredluminosities and star formation rates from the observed 24um flux will beuncertain at the factor-of-five level (total range). The correspondinguncertainties using the redshifted 8.0um flux (e.g. observed 24um flux for az=2 source) are factors of 10-20. Considerable caution should be used wheninterpreting such extrapolated infrared luminosities.Comment: 32 pages including 16 figures; accepted for publication in the Astrophysical Journa

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