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J/A+A/597/A51       Physical properties of Spitzer/IRS galaxies    (Vika+, 2017)

The physical properties of Spitzer/IRS galaxies derived from their UV to 22 mum spectral energy distribution. Vika M., Ciesla L., Charmandaris V. Xilouris E.M., Lebouteiller V. <Astron. Astrophys. 597, A51 (2017)> =2017A&A...597A..51V (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Galaxies, photometry Keywords: galaxies: photometry - galaxies: fundamental parameters - catalogs - galaxies: star formation Abstract: We provide the basic integrated physical properties of all the galaxies contained in the full Cornell Atlas of Spitzer/IRS Sources (CASSIS) with available broad-band photometry from UV to 22 microns. We have collected broad-band photometric measurements in 14 wavelengths from available public surveys in order to study the spectral energy distribution (SED) of each galaxy in CASSIS, thus constructing a final sample of 1146 galaxies in the redshift range 0<z<2.5. The SEDs are modelled with the CIGALE code which relies on the energy balance between the absorbed stellar and the dust emission while taking into account the possible contribution due to the presence of an active galactic nucleus (AGN). We split the galaxies in three groups, a low-redshift (z<0.1), a mid-redshift (0.1=<z<0.5) and a high-redshift (z≥0.5) sub-sample and find that the vast majority of the Spitzer/IRS galaxies are star-forming and lie on or above the star-forming main sequence of the corresponding redshift. Moreover, the emission of Spitzer/IRS galaxies with z<0.1 is mostly dominated by star-formation, galaxies in the mid-redshift bin are a mixture of star forming and AGN galaxies, while half of the galaxies with z≥0.5 show moderate or high AGN activity. Additionally, using rest-frame NUV-r colour, Sersic indices, optical [OIII] and [NII] emission lines we explore the nature of these galaxies by investigating further their structure as well as their star-formation and AGN activity. Using a colour magnitude diagram we confirm that 97% of the galaxies with redshift smaller than 0.5 have experienced a recent star-formation episode. For a sub-sample of galaxies with available structural information and redshift smaller than 0.3 we find that early-type galaxies are placed below the main sequence, while late-type galaxies are found on the main- sequence as expected. Finally, for all the galaxies with redshift smaller than 0.5 and available optical spectral line measurements we compare the ability of CIGALE to detect the presence of an AGN in contrast to the optical spectra classification. We find that galaxies with high AGN luminosity, as calculated by CIGALE, are most likely to be classified as composite or AGNs by optical spectral lines. Description: Physical parameters for 1146 galaxies that also have IRS/Spitzer spectra are presented. The physical parameters were derived with the use of the CIGALE code. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file cassis.dat 220 1145 IDs, physical parameters for 1146 of the CASSIS sample
Byte-by-byte Description of file: cassis.dat
Bytes Format Units Label Explanations
1- 8 I8 --- AORkey Spitzer/IRS identification key 10- 16 F7.3 deg RAdeg Right ascension of the Spitzer/IRS source (J2000) 18- 24 F7.3 deg DEdeg Declination of the Spitzer/IRS source (J2000) 26- 29 F4.2 --- z Redshift from NED 31- 51 F21.6 Msun M* Stellar mass as measured by CIGALE 53- 73 F21.6 Msun e_M* Uncertainty of stellar mass as measured by CIGALE 75- 85 F11.5 Msun/yr SFR Star-formation rate as measured by CIGALE 87- 97 F11.5 Msun/yr e_SFR Uncertainty of star- formation rate as measured by CIGALE 99-103 I5 Myr Age Stellar age as measured by CIGALE 105-108 I4 Myr e_Age Uncertainty of stellar age as measured by CIGALE 110-115 F6.4 --- AE(B-V) Attenuation of young stellar populations as measured by CIGALE 117-122 F6.4 --- e_AE(B-V) Uncertainty of E(B-V) attenuation of young stellar populations as measured by CIGALE 124-128 F5.3 --- fAGN Contribution of an AGN to the total IR luminosity as measured by CIGALE 130-134 F5.3 --- e_fAGN Uncertainty of contribution of an AGN to the total IR luminosity as measured by CIGALE 136-143 E8.2 W LAGN AGN luminosity as measured by CIGALE 145-152 E8.2 W e_LAGN Uncertainty of AGN luminosity as measured by CIGALE 154-161 E8.2 W Ldust Dust luminosity as measured by CIGALE 163-170 E8.2 W e_Ldust Uncertainty of dust luminosity as measured by CIGALE 172-177 F6.4 mag AFUV The attenuation in the FUV as measured by CIGALE 179-183 F5.3 --- chi2r Minimised chi square of the fit 185-214 A30 --- NEDname Galaxy name from NED 216 I1 --- A [0/4] Classification (1) 218 I1 --- B [0/3] Classification (2) 220 I1 --- f [0/1] Flag where 1 indicates saturation flag in SDSS data
Note (1): Classification a as follows: 1 = late-galaxy 2 = blue & high-n galaxy 3 = red & low-n galaxy 4 = early-type galaxy 0 = not available classification Note (2): Classificaiton B as follows: 1 = AGN 2 = composite 3 = star-forming galaxy 0 = not available classification
Acknowledgements: Marina Vika, mvika (at) astro.noa.gr
(End) Marina Vika [NOA, Greece], Patricia Vannier [CDS] 18-Oct-2016
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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