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J/ApJ/723/895 IR luminosities and aromatic features of 5MUSES (Wu+, 2010)
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Beginning of ReadMe :J/ApJ/723/895 IR luminosities and aromatic features of 5MUSES (Wu+, 2010)
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Infrared luminosities and aromatic features in the 24 mum flux-limited sample
of 5MUSES.
Wu Y., Helou G., Armus L., Cormier D., Shi Y., Dale D., Dasyra K.,
Smith J.D., Papovich C., Draine B., Rahman N., Stierwalt S., Fadda D.,
Lagache G., Wright E.L.
<Astrophys. J., 723, 895-914 (2010)>
=2010ApJ...723..895W
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ADC_Keywords: Active gal. nuclei ; Galaxies, IR ; Spectra, infrared ; Surveys
Keywords: galaxies: active - galaxies: starburst - infrared: galaxies - surveys
Abstract:
We study a 24um selected sample of 330 galaxies observed with the
infrared spectrograph for the 5mJy Unbiased Spitzer Extragalactic
Survey (5MUSES). We estimate accurate total infrared luminosities by
combining mid-IR spectroscopy and mid-to-far infrared photometry, and
by utilizing new empirical spectral templates from Spitzer data. The
infrared luminosities of this sample range mostly from 10^9^L_sun_
to 10^13.5^L_sun_, with 83% in the range
10^10^L_sun_<L_IR_<10^12^L_sun_. The redshifts range from 0.008 to
4.27, with a median of 0.144. The equivalent widths of the 6.2um
aromatic feature have a bimodal distribution, probably related to
selection effects. We use the 6.2um polycyclic aromatic hydrocarbon
equivalent width (PAH EW) to classify our objects as starburst
(SB)-dominated (44%), SB-AGN composite (22%), and active galactic
nucleus (AGN)-dominated (34%). The high EW objects (SB-dominated) tend
to have steeper mid-IR to far-IR spectral slopes and lower LIR and
redshifts.
Description:
5MUSES is a mid-IR spectroscopic survey of a 24um flux-limited
(f_24um_>5mJy) representative sample of 330 galaxies. The galaxies are
selected from the SWIRE fields including Elais-N1 (9.5deg^2^),
Elais-N2 (5.3deg^2^), Lockman Hole (11.6deg^2^), and XMM (9.2deg^2^),
in addition to the Spitzer Extragalactic First Look Survey (XFLS;
5.0deg^2^) field (Fadda et al., 2006, Cat. J/AJ/131/2859). The full
details of the sample, including selection criteria and observation
strategy are covered in G. Helou et al. (2010, in preparation).
IRAC 3.6-8.0um photometry is available for the entire 5MUSES sample.
In addition to the Multiband Imaging Photometer for Spitzer (MIPS)
24um photometry used to select this sample, 90% of our sources have
also been detected at 70um and 54% have been detected at 160um.
Low-resolution spectra (R=64-128) of all 330 galaxies in 5MUSES have
been obtained with the short-low (SL: 5.5-14.5um and long-low (LL:
14-35um) modules of the IRS using the staring mode observations.