Abstract
We report the final optical identifications of the medium-depth (∼60ks), contiguous (2deg2) XMM-Newton survey of the COSMOS field. XMM-Newton has detected ∼1800 X-ray sources down to limiting fluxes of ∼5 × 10-16, ∼3 × 10-15, and ∼7 × 10-15ergcm-2s-1 in the 0.5-2keV, 2-10keV, and 5-10keV bands, respectively (∼1 × 10-15, 6 × 10-15, and 1 × 10-14ergcm-2s -1, in the three bands, respectively, over 50% of the area). The work is complemented by an extensive collection of multiwavelength data from 24 μm to UV, available from the COSMOS survey, for each of the X-ray sources, including spectroscopic redshifts for ≳50% of the sample, and high-quality photometric redshifts for the rest. The XMM and multiwavelength flux limits are well matched: 1760 (98%) of the X-ray sources have optical counterparts, 1711 (95%) have IRAC counterparts, and 1394 (78%) have MIPS 24μm detections. Thanks to the redshift completeness (almost 100%) we were able to constrain the high-luminosity tail of the X-ray luminosity function confirming that the peak of the number density of log LX > 44.5 active galactic nuclei (AGNs) is at z ∼ 2. Spectroscopically identified obscured and unobscured AGNs, as well as normal and star-forming galaxies, present well-defined optical and infrared properties. We devised a robust method to identify a sample of ∼150 high-redshift (z > 1), obscured AGN candidates for which optical spectroscopy is not available. We were able to determine that the fraction of the obscured AGN population at the highest (LX > 10 44ergs-1) X-ray luminosity is ∼15%-30% when selection effects are taken into account, providing an important observational constraint for X-ray background synthesis. We studied in detail the optical spectrum and the overall spectral energy distribution of a prototypical Type 2 QSO, caught in a stage transitioning from being starburst dominated to AGN dominated, which was possible to isolate only thanks to the combination of X-ray and infrared observations.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 348-369 |
| Number of pages | 22 |
| Journal | Astrophysical Journal |
| Volume | 716 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 1 2010 |
| Externally published | Yes |
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Keywords
- Galaxies: active
- Surveys
- X-rays: diffuse background
- X-rays: galaxies
- X-rays: general
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
Cite this
The XMM-newton wide-field survey in the cosmos field (XMM-COSMOS) : Demography and multiwavelength properties of obscured and unobscured luminous active galactic nuclei. / Brusa, M.; Civano, F.; Comastri, A.; Miyaji, T.; Salvato, M.; Zamorani, G.; Cappelluti, Nico; Fiore, F.; Hasinger, G.; Mainieri, V.; Merloni, A.; Bongiorno, A.; Capak, P.; Elvis, M.; Gilli, R.; Hao, H.; Jahnke, K.; Koekemoer, A. M.; Ilbert, O.; Le Floc'H, E.; Lusso, E.; Mignoli, M.; Schinnerer, E.; Silverman, J. D.; Treister, E.; Trump, J. D.; Vignali, C.; Zamojski, M.; Aldcroft, T.; Aussel, H.; Bardelli, S.; Bolzonella, M.; Cappi, A.; Caputi, K.; Contini, T.; Finoguenov, A.; Fruscione, A.; Garilli, B.; Impey, C. D.; Iovino, A.; Iwasawa, K.; Kampczyk, P.; Kartaltepe, J.; Kneib, J. P.; Knobel, C.; Kovac, K.; Lamareille, F.; Leborgne, J. F.; Le Brun, V.; Le Fevre, O.; Lilly, S. J.; Maier, C.; McCracken, H. J.; Pello, R.; Peng, Y. J.; Perez-Montero, E.; De Ravel, L.; Sanders, D.; Scodeggio, M.; Scoville, N. Z.; Tanaka, M.; Taniguchi, Y.; Tasca, L.; De La Torre, S.; Tresse, L.; Vergani, D.; Zucca, E.
In: Astrophysical Journal, Vol. 716, No. 1, 01.01.2010, p. 348-369.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The XMM-newton wide-field survey in the cosmos field (XMM-COSMOS)
T2 - Demography and multiwavelength properties of obscured and unobscured luminous active galactic nuclei
AU - Brusa, M.
AU - Civano, F.
AU - Comastri, A.
AU - Miyaji, T.
AU - Salvato, M.
AU - Zamorani, G.
AU - Cappelluti, Nico
AU - Fiore, F.
AU - Hasinger, G.
AU - Mainieri, V.
AU - Merloni, A.
AU - Bongiorno, A.
AU - Capak, P.
AU - Elvis, M.
AU - Gilli, R.
AU - Hao, H.
AU - Jahnke, K.
AU - Koekemoer, A. M.
AU - Ilbert, O.
AU - Le Floc'H, E.
AU - Lusso, E.
AU - Mignoli, M.
AU - Schinnerer, E.
AU - Silverman, J. D.
AU - Treister, E.
AU - Trump, J. D.
AU - Vignali, C.
AU - Zamojski, M.
AU - Aldcroft, T.
AU - Aussel, H.
AU - Bardelli, S.
AU - Bolzonella, M.
AU - Cappi, A.
AU - Caputi, K.
AU - Contini, T.
AU - Finoguenov, A.
AU - Fruscione, A.
AU - Garilli, B.
AU - Impey, C. D.
AU - Iovino, A.
AU - Iwasawa, K.
AU - Kampczyk, P.
AU - Kartaltepe, J.
AU - Kneib, J. P.
AU - Knobel, C.
AU - Kovac, K.
AU - Lamareille, F.
AU - Leborgne, J. F.
AU - Le Brun, V.
AU - Le Fevre, O.
AU - Lilly, S. J.
AU - Maier, C.
AU - McCracken, H. J.
AU - Pello, R.
AU - Peng, Y. J.
AU - Perez-Montero, E.
AU - De Ravel, L.
AU - Sanders, D.
AU - Scodeggio, M.
AU - Scoville, N. Z.
AU - Tanaka, M.
AU - Taniguchi, Y.
AU - Tasca, L.
AU - De La Torre, S.
AU - Tresse, L.
AU - Vergani, D.
AU - Zucca, E.
PY - 2010/1/1
Y1 - 2010/1/1
N2 - We report the final optical identifications of the medium-depth (∼60ks), contiguous (2deg2) XMM-Newton survey of the COSMOS field. XMM-Newton has detected ∼1800 X-ray sources down to limiting fluxes of ∼5 × 10-16, ∼3 × 10-15, and ∼7 × 10-15ergcm-2s-1 in the 0.5-2keV, 2-10keV, and 5-10keV bands, respectively (∼1 × 10-15, 6 × 10-15, and 1 × 10-14ergcm-2s -1, in the three bands, respectively, over 50% of the area). The work is complemented by an extensive collection of multiwavelength data from 24 μm to UV, available from the COSMOS survey, for each of the X-ray sources, including spectroscopic redshifts for ≳50% of the sample, and high-quality photometric redshifts for the rest. The XMM and multiwavelength flux limits are well matched: 1760 (98%) of the X-ray sources have optical counterparts, 1711 (95%) have IRAC counterparts, and 1394 (78%) have MIPS 24μm detections. Thanks to the redshift completeness (almost 100%) we were able to constrain the high-luminosity tail of the X-ray luminosity function confirming that the peak of the number density of log LX > 44.5 active galactic nuclei (AGNs) is at z ∼ 2. Spectroscopically identified obscured and unobscured AGNs, as well as normal and star-forming galaxies, present well-defined optical and infrared properties. We devised a robust method to identify a sample of ∼150 high-redshift (z > 1), obscured AGN candidates for which optical spectroscopy is not available. We were able to determine that the fraction of the obscured AGN population at the highest (LX > 10 44ergs-1) X-ray luminosity is ∼15%-30% when selection effects are taken into account, providing an important observational constraint for X-ray background synthesis. We studied in detail the optical spectrum and the overall spectral energy distribution of a prototypical Type 2 QSO, caught in a stage transitioning from being starburst dominated to AGN dominated, which was possible to isolate only thanks to the combination of X-ray and infrared observations.
AB - We report the final optical identifications of the medium-depth (∼60ks), contiguous (2deg2) XMM-Newton survey of the COSMOS field. XMM-Newton has detected ∼1800 X-ray sources down to limiting fluxes of ∼5 × 10-16, ∼3 × 10-15, and ∼7 × 10-15ergcm-2s-1 in the 0.5-2keV, 2-10keV, and 5-10keV bands, respectively (∼1 × 10-15, 6 × 10-15, and 1 × 10-14ergcm-2s -1, in the three bands, respectively, over 50% of the area). The work is complemented by an extensive collection of multiwavelength data from 24 μm to UV, available from the COSMOS survey, for each of the X-ray sources, including spectroscopic redshifts for ≳50% of the sample, and high-quality photometric redshifts for the rest. The XMM and multiwavelength flux limits are well matched: 1760 (98%) of the X-ray sources have optical counterparts, 1711 (95%) have IRAC counterparts, and 1394 (78%) have MIPS 24μm detections. Thanks to the redshift completeness (almost 100%) we were able to constrain the high-luminosity tail of the X-ray luminosity function confirming that the peak of the number density of log LX > 44.5 active galactic nuclei (AGNs) is at z ∼ 2. Spectroscopically identified obscured and unobscured AGNs, as well as normal and star-forming galaxies, present well-defined optical and infrared properties. We devised a robust method to identify a sample of ∼150 high-redshift (z > 1), obscured AGN candidates for which optical spectroscopy is not available. We were able to determine that the fraction of the obscured AGN population at the highest (LX > 10 44ergs-1) X-ray luminosity is ∼15%-30% when selection effects are taken into account, providing an important observational constraint for X-ray background synthesis. We studied in detail the optical spectrum and the overall spectral energy distribution of a prototypical Type 2 QSO, caught in a stage transitioning from being starburst dominated to AGN dominated, which was possible to isolate only thanks to the combination of X-ray and infrared observations.
KW - Galaxies: active
KW - Surveys
KW - X-rays: diffuse background
KW - X-rays: galaxies
KW - X-rays: general
UR - http://www.scopus.com/inward/record.url?scp=77952911396&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77952911396&partnerID=8YFLogxK
U2 - 10.1088/0004-637X/716/1/348
DO - 10.1088/0004-637X/716/1/348
M3 - Article
VL - 716
SP - 348
EP - 369
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
ER -