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J/ApJ/703/1778     Spitzer sources in SWIRE/XMM/ELAIS-S1 field   (Sacchi+, 2009)

Spectroscopic identifications of Spitzer sources in the SWIRE/XMM-Newton/ELAIS-S1 field: a large fraction of active galactic nucleus with high F(24µm)/F(R) ratio. Sacchi N., La Franca F., Feruglio C., Fiore F., Puccetti S., Cocchia F., Berta S., Brusa M., Cimatti A., Comastri A., Franceschini A., Gruppioni C., Maiolino R., Matute I., Polletta M., Pozzetti L., Pozzi F., Vignali C., Zamorani G., Oliver S., Rowan-Robinson M., Smith G., Lonsdale C. <Astrophys. J., 703, 1778-1790 (2009)> =2009ApJ...703.1778S
ADC_Keywords: Surveys ; Galaxies, IR ; Active gal. nuclei ; Redshifts Keywords: galaxies: active - infrared: galaxies - surveys Abstract: We present a catalog of optical spectroscopic identifications of sources detected by Spitzer at 3.6 or 24um down to ∼10 and ∼280uJy, respectively, in the SWIRE/XMM-Newton/ELAIS-S1 field and classified via line width analysis and diagnostic diagrams. A total of 1376 sources down to R∼24.2mag have been identified (1362 detected at 3.6um, 419 at 24um, and 405 at both) by low-resolution optical spectroscopy carried out with FORS2, VIMOS, and EFOSC2 at the Very Large Telescope and 3.6m ESO telescope. The spectroscopic campaigns have been carried out over the central 0.6deg2 area of ELAIS-S1 which, in particular, has also been observed by XMM-Newton and Chandra. We find the first direct optical spectroscopic evidence that the fraction of active galactic nuclei (AGNs; mostly AGN2) increases with increasing F(24um)/F(R) ratio, reaching values of 70(±20)% in the range 316<F(24um)/F(R)<1000. We present an Infrared Array Camera-Multiband Imaging Photometer color-color diagram able to separate AGN1 from obscured AGN2 candidates. After having corrected for the spectroscopic incompleteness of our sample, the result is that the AGN fraction at F(24um)∼0.8mJy is ∼22(±7)% and decreases slowly to ∼19(±5)% down to F(24um)∼0.3mJy. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 108 1376 The spectroscopic catalog
See also: J/A+A/451/881 : ESIS BVR catalog, ELAIS-S1 (Berta+, 2006) J/A+A/457/501 : XMM-Newton survey of the ELAIS-S1 field. I. (Puccetti+, 2006) J/A+A/488/417 : XMM-Newton survey of the ELAIS-S1 field. II. (Feruglio+, 2008) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq Running identification number 6- 25 A20 --- ESIS ESIS identification from Berta et al., 2006, Cat. J/A+A/451/881 27- 33 F7.5 deg RAdeg Right Ascension in decimal degrees (J2000) 35- 43 F9.5 deg DEdeg Declination in decimal degrees (J2000) 45- 49 F5.2 mag Rmag R band Vega magnitude 51- 55 F5.3 --- z Redshift (spectroscopic) 57- 59 F3.1 --- q_z Quality code for z (2=reliable) (1) 61 I1 --- Class [1/5] Spectroscopic classification code (2) 63- 88 A26 --- SWIRE SWIRE identification name, (3) 90- 96 F7.4 [uJy] S3.6um ? Log of 3.6 micron band flux density 98-104 F7.4 [uJy] S24um ? Log of 24 micron band flux density 106-108 I3 --- XMMES1 ? XMM source name (4)
Note (1): Quality code is numbered as: 2.0 = reliable, based on >2 confirmed lines 1.5 = very plausible, based on 2 lines 1.0 = uncertain Note (2): Spectroscopic classification code as follows: 1 = type-1 AGN 2 = type-2 AGN 3 = Emission-Line Galaxy (ELG) 4 = normal galaxy 5 = star Note (3): Of the most probable corresponding Spitzer source. Contains in a few cases a number in place of the SWIRE identification, not explained in the paper. Note (4): see Feruglio et al., 2008, Cat. J/A+A/488/417.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 26-Jan-2010
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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