J/ApJ/646/161 Classification of IR galaxies (Dale+, 2006)
Mid-infrared spectral diagnostics of nuclear and extranuclear regions in nearby
galaxies.
Dale D.A., Smith J.D.T., Armus L., Buckalew B.A., Helou G.,
Kennicutt R.C.Jr, Moustakas J., Roussel H., Sheth K., Bendo G.J.,
Calzetti D., Draine B.T., Engelbracht C.W., Gordon K.D., Hollenbach D.J.,
Jarrett T.H., Kewley L.J., Leitherer C., Li A., Malhotra S., Murphy E.J.,
Walter F.
<Astrophys. J., 646, 161-173 (2006)>
=2006ApJ...646..161D 2006ApJ...646..161D
ADC_Keywords: Galaxies, IR ; Active gal. nuclei ; H II regions
Keywords: galaxies: active - galaxies: nuclei - H II regions -
infrared: galaxies - infrared: ISM
Abstract:
Mid-infrared diagnostics are presented for a large portion of the
Spitzer Infrared Nearby Galaxies Survey (SINGS) sample plus archival
data from ISO and Spitzer. The SINGS data set includes low- and
high-resolution spectral maps and broadband imaging in the infrared
for over 160 nuclear and extranuclear regions within 75 nearby
galaxies spanning a wide range of morphologies, metallicities,
luminosities, and star formation rates. Our main result is that these
mid-infrared diagnostics effectively constrain a targets dominant
power source. The combination of a high-ionization line index and PAH
strength serves as an efficient discriminant between AGNs and
star-forming nuclei, confirming progress made with ISO spectroscopy on
starbursting and ultraluminous infrared galaxies. The sensitivity of
Spitzer allows us to probe fainter nuclear and star-forming regions
within galaxy disks.
Description:
The full SINGS observing program and the data processing are described
by Kennicutt et al. (2003PASP..115..928K 2003PASP..115..928K), Smith et al.
(2004ApJS..154..199S 2004ApJS..154..199S), and Dale et al. (2005ApJ...633..857D 2005ApJ...633..857D).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 02-May-2008