Astrophys. J., 730, 19 (2011/March-3)
Infrared spectra and spectral energy distributions for dusty starbursts and active galactic nuclei.
SARGSYAN L., WEEDMAN D., LEBOUTEILLER V., HOUCK J., BARRY D., HOVHANNISYAN A. and MICKAELIAN A.
Abstract (from CDS):
We present spectroscopic results for all galaxies observed with the Spitzer Infrared Spectrograph (IRS) that also have total infrared fluxes fIR measured with the Infrared Astronomical Satellite (IRAS), also using AKARI photometry when available. Infrared luminosities and spectral energy distributions (SEDs) from 8 µm to 160 µm are compared to polycyclic aromatic hydrocarbon emission from starburst galaxies or mid-infrared dust continuum from active galactic nuclei (AGNs) at rest-frame wavelengths ∼8 µm. A total of 301 spectra are analyzed for which IRS and IRAS include the same unresolved source, as measured by the ratio fν(IRAS 25 µm)/f ν(IRS 25 µm). Sources have 0.004 < z < 0.34 and 42.5 < log LIR < 46.8 (erg/s) and cover the full range of starburst galaxy and AGN classifications. Individual spectra are provided electronically, but averages and dispersions are presented. We find that log [LIR/νLν(7.7 µm)] = 0.74 ± 0.18 in starbursts, log [LIR/νLν(7.7 µm)] = 0.96±0.26 in composite sources (starburst plus AGN), log [LIR/νLν(7.9 µm)] = 0.80±0.25 in AGNs with silicate absorption, and that log [LIR/νL ν(7.9 µm)] = 0.51±0.21 in AGNs with silicate emission. LIRfor the most luminous absorption and emission AGNs are similar and 2.5 times larger than for the most luminous starbursts. AGNs have systematically flatter SEDs than starbursts or composites, but their dispersion in SEDs overlaps starbursts. Sources with the strongest far-infrared luminosity from cool dust components are composite sources, indicating that these sources may contain the most obscured starbursts.
galaxies: active - galaxies: distances and redshifts - galaxies: evolution - galaxies: starburst - infrared: galaxies
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<Available at CDS (J/ApJ/730/19): table1.dat table2.dat table3.dat table4.dat table5.dat table6.dat>
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