We present a catalog of optical spectroscopic identifications of sources detected by Spitzer at 3.6 or 24 μm down to ∼10 and ∼280 μJy, 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 ∼ 24.2 mag have been identified (1362 detected at 3.6 μm, 419 at 24 μm, and 405 at both) by low-resolution optical spectroscopy carried out with FORS2, VIMOS, and EFOSC2 at the Very Large Telescope and 3.6 m ESO telescope. The spectroscopic campaigns have been carried out over the central 0.6 deg2 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(24 μm)/F(R) ratio, reaching values of 70(±20)% in the range 316 < F(24 μm)/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(24 μm) ∼0.8 mJy is ∼22(±7)% and decreases slowly to ∼19(±5)% down to F(24 μm) ∼ 0.3 mJy.

N. Sacchi, F. La Franca, C. Feruglio, F. Fiore, S. Puccetti, F. Cocchia, et al. (2009). SPECTROSCOPIC IDENTIFICATIONS OF SPITZER SOURCES IN THE SWIRE/XMM-NEWTON/ELAIS-S1 FIELD: A LARGE FRACTION OF ACTIVE GALACTIC NUCLEI WITH HIGH F(24 μm)/F(R) RATIO. THE ASTROPHYSICAL JOURNAL, 703, 1778-1790 [10.1088/0004-637X/703/2/1778].

SPECTROSCOPIC IDENTIFICATIONS OF SPITZER SOURCES IN THE SWIRE/XMM-NEWTON/ELAIS-S1 FIELD: A LARGE FRACTION OF ACTIVE GALACTIC NUCLEI WITH HIGH F(24 μm)/F(R) RATIO

BRUSA, MARCELLA;CIMATTI, ANDREA;POZZI, FRANCESCA;VIGNALI, CRISTIAN;
2009

Abstract

We present a catalog of optical spectroscopic identifications of sources detected by Spitzer at 3.6 or 24 μm down to ∼10 and ∼280 μJy, 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 ∼ 24.2 mag have been identified (1362 detected at 3.6 μm, 419 at 24 μm, and 405 at both) by low-resolution optical spectroscopy carried out with FORS2, VIMOS, and EFOSC2 at the Very Large Telescope and 3.6 m ESO telescope. The spectroscopic campaigns have been carried out over the central 0.6 deg2 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(24 μm)/F(R) ratio, reaching values of 70(±20)% in the range 316 < F(24 μm)/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(24 μm) ∼0.8 mJy is ∼22(±7)% and decreases slowly to ∼19(±5)% down to F(24 μm) ∼ 0.3 mJy.
2009
N. Sacchi, F. La Franca, C. Feruglio, F. Fiore, S. Puccetti, F. Cocchia, et al. (2009). SPECTROSCOPIC IDENTIFICATIONS OF SPITZER SOURCES IN THE SWIRE/XMM-NEWTON/ELAIS-S1 FIELD: A LARGE FRACTION OF ACTIVE GALACTIC NUCLEI WITH HIGH F(24 μm)/F(R) RATIO. THE ASTROPHYSICAL JOURNAL, 703, 1778-1790 [10.1088/0004-637X/703/2/1778].
N. Sacchi; F. La Franca; C. Feruglio; F. Fiore; S. Puccetti; F. Cocchia; S. Berta; M. Brusa; A. Cimatti; A. Comastri; A. Franceschini; C. Gruppioni; R...espandi
File in questo prodotto:
Eventuali allegati, non sono esposti

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/77431
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 18
  • ???jsp.display-item.citation.isi??? 18
social impact