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J/A+A/551/A100      Panchromatic SED of Herschel sources     (Berta+, 2013)

Panchromatic spectral energy distributions of Herschel sources. Berta S., Lutz D., Santini P., Wuyts S., Rosario D., Brisbin D., Cooray A., Franceschini A., Gruppioni C., Hatziminaoglou E., Hwang H.S., Le Floc'h E., Magnelli B., Nordon R., Oliver S., Page M.J., Popesso P., Pozzetti L., Pozzi F., Riguccini L., Rodighiero G., Roseboom I., Scott D., Symeonidis M., Valtchanov I., Viero M., Wang L. <Astron. Astrophys. 551, A100 (2013)> =2013A&A...551A.100B
ADC_Keywords: Galaxies, IR ; Galaxies, optical ; Galaxies, Seyfert ; Active gal. nuclei ; Energy distributions Keywords: infrared: galaxies - galaxies: statistics - galaxies: star formation - galaxies: active - galaxies: evolution Abstract: Combining far-infrared Herschel photometry from the PACS Evolutionary Probe (PEP) and Herschel Multi-tiered Extragalactic Survey (HerMES) guaranteed time programs with ancillary datasets in the GOODS-N, GOODS-S and COSMOS fields, it is possible to sample the 8-500 micron spectral energy distributions of galaxies with at least 7-10 bands. Extending to the UV, optical, and near- infrared, the number of bands increases up to 43. We reproduce the distribution of galaxies in a carefully selected 10 restframe color space, based on this rich data-set, using a superposition of multi-variate Gaussian modes. We use this model to classify galaxies and build median spectral energy distributions (SEDs) of each class, which are then fitted with a modified version of the MAGPHYS code that combines stellar light, emission from dust heated by stars and a possible warm dust contribution heated by an Active Galactic Nucleus (AGN). The color distribution of galaxies in each of the considered fields can be well described with the combination of 6-9 classes, spanning a large range of far- to near-IR luminosity ratios, as well as different strength of the AGN contribution to bolometric luminosities. The defined Gaussian grouping is used to identify rare or odd sources. The zoology of outliers includes Herschel-detected ellipticals, very blue z∼1 Lyα-break galaxies, quiescent spirals, and torus-dominated AGN with star formation. Out of these groups and outliers, a new template library is assembled, consisting of 32 SEDs describing the intrinsic scatter in the restframe UV-to-submm colors of infrared galaxies. This library is tested against L(IR) estimates with and without Herschel data included, and compared to eight other popular methods often adopted in the literature. When implementing Herschel photometry, these approaches produce L(IR) values consistent with each other within a median absolute deviation of 10-20%, the scatter being dominated more by fine tuning of the codes, rather than by the choice of SED templates. Finally, the library is used to classify 24 micron detected sources in PEP GOODS fields on the basis of AGN content, L(60)/L(100) color and L(160)/L(1.6) luminosity ratio. AGN appear to be distributed in M*-SFR along with all other galaxies, regardless of the amount of infrared luminosity they are powering, with the tendency to lie on the high SFR side of the "main sequence". The incidence of warmer star-forming sources grows for objects with higher specific star formation rates, and they tend to populate the "off-sequence" region of the M*-SFR-z space. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file list.dat 69 32 List of available files temp1p6/* 30 32 Templates of galaxies normalised to 1.6um tempLIR/* 30 32 Templates of galaxies normalised at L(IR)=1L☉ tempM/* 30 32 Templates of galaxies normalised at M*=10+10M☉
Byte-by-byte Description of file: list.dat
Bytes Format Units Label Explanations
1- 17 A17 --- FileName Generic name of the file 19- 59 A41 --- Mod Type of galaxy 61- 63 A3 --- 1p6 Spectrum normalized to 1.6um 65- 67 A3 --- LIR Spectrum normalized to LIR=1L☉ 69 A1 --- M Spectrum normalized to M*=10+10M☉
Byte-by-byte Description of file: temp*/*
Bytes Format Units Label Explanations
1- 15 F15.5 0.1nm lambda [90/1949e+04] Wavelength 16- 30 E15.7 --- Flux Flux density S(lambda), normalized
Acknowledgements: Stefano Berta, berta(at) History: * 01-Mar-2013: First on-line version * 13-Jun-2016: Corrected spectra, from author
(End) Stefano Berta [MPE, Germany], Patricia Vannier [CDS] 13-Jun-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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