The authors thank http://arxiv.org/abs/astro-ph/0703255 for their preprint deposit authorization. The original publication can be found in the Astrophysical Journal.
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Infrared: Galaxies; Galaxies: Quasars: General; X-Rays: Galaxies; Galaxies: Active
Abstract :
[en] We present the SEDs of a hard X-ray selected sample containing 136 sources with F[SUB]2-10keV[/SUB]>10[SUP]-14[/SUP] erg cm[SUP]-2[/SUP] s[SUP]-1[/SUP] 132 are AGNs. The sources are detected in a 1 deg[SUP]2[/SUP] area of the XMM-Newton Medium Deep Survey where optical data from the VVDS and CFHTLS and infrared data from the SWIRE survey are available. Based on a SED fitting technique we derive photometric redshifts with sigma(1+z)=0.11 and 6% of outliers and identify AGN signatures in 83% of the objects. This fraction is higher than derived when a spectroscopic classification is available. The remaining 17[SUP]+9[/SUP][SUB]-6[/SUB]% of AGNs show star-forming galaxy SEDs (SF class). The sources with AGN signatures are divided in two classes, AGN1 (33[SUP]+6[/SUP][SUB]-1[/SUB]%) and AGN2 (50[SUP]+6[/SUP][SUB]-11[/SUB]%). The AGN1 and AGN2 classes include sources whose SEDs are fitted by type 1 and type 2 AGN templates, respectively. On average, AGN1s show soft X-ray spectra, consistent with being unabsorbed, while AGN2s and SFs show hard X-ray spectra, consistent with being absorbed. The analysis of the average SEDs as a function of X-ray luminosity shows a reddening of the infrared SEDs, consistent with a decreasing contribution from the host galaxy at higher luminosities. The AGNs in the SF classes are likely obscured in the mid-infrared, as suggested by their low L[SUB]3-20mum[/SUB]/L[SUP]corr[/SUP][SUB]0.5-10keV[/SUB] ratios. We confirm the previously found correlation for AGNs between the radio luminosity and the X-ray and the mid-infrared luminosities. The X-ray-radio correlation can be used to identify heavily absorbed AGNs. However, the estimated radio fluxes for the missing AGN population responsible for the bulk of the background at E>10 keV are too faint to be detected even in the deepest current radio surveys.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Polletta, M.; Center for Astrophysics and Space Sciences, University of California, San Diego, La Jolla, CA 92093-0424.
Tajer, M.; INAF-Osservatorio di Brera, via Brera 28, 20121 Milano, Italy. ; Università degli studi di Milano-Bicocca, Dipartimento di fisica, Piazza della Scienza 3, 20126 Milano, Italy.
Maraschi, L.; INAF-Osservatorio di Brera, via Brera 28, 20121 Milano, Italy.
Trinchieri, G.; INAF-Osservatorio di Brera, via Brera 28, 20121 Milano, Italy.
Lonsdale, C. J.; Center for Astrophysics and Space Sciences, University of California, San Diego, La Jolla, CA 92093-0424.
Chiappetti, L.; INAF-IASF Milano, via Bassini 15, I-20133 Milano, Italy.
Andreon, S.; INAF-Osservatorio di Brera, via Brera 28, 20121 Milano, Italy.
Pierre, M.; CEA Saclay, DSM/DAPNIA, Service d'Astrophysique, 91191 Gif-sur-Yvette, France.
Le Fèvre, O.; Laboratoire d'Astrophysique de Marseille, UMR 6110 CNRS-Université de Provence, Traverse du Siphon, BP 8, 13012 Marseille, France.
Zamorani, G.; INAF-Osservatorio di Bologna, via Ranzani 1, 40127 Bologna, Italy.
Maccagni, D.; INAF-IASF Milano, via Bassini 15, I-20133 Milano, Italy.
Garcet, Olivier ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Surdej, Jean ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Franceschini, A.; Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 2, I-35122, Padova, Italy.
Alloin, D.; CEA Saclay, DSM/DAPNIA, Service d'Astrophysique, 91191 Gif-sur-Yvette, France.
Shupe, D. L.; Spitzer Science Center, California Institute of Technology, 100-22, Pasadena, CA 91125.
Surace, J. A.; Spitzer Science Center, California Institute of Technology, 100-22, Pasadena, CA 91125.
Fang, F.; Spitzer Science Center, California Institute of Technology, 100-22, Pasadena, CA 91125.
Rowan-Robinson, M.; Astrophysics Group, Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2BW, UK.
Smith, H. E.; Center for Astrophysics and Space Sciences, University of California, San Diego, La Jolla, CA 92093-0424.
Tresse, L.; Laboratoire d'Astrophysique de Marseille, UMR 6110 CNRS-Université de Provence, Traverse du Siphon, BP 8, 13012 Marseille, France.
Akiyama, M., Ueda, Y., Ohta, K., Takahashi, T., & Yamada, T. 2003, ApJS, 148, 275
Akylas, A., Georgantopoulos, I., Georgakakis, A., Kitsionas, S., & Hatziminaoglou. E. 2006, A&A, 459, 693
Alexander, D. M., Aussel, H., Bauer, F. E., Brandt, W. N., Hornschemeier, A. E., Vignali, C., Garmire, G. P., & Schneider, D. P. 2002, ApJ, 568, L85
Alexander, D. M., Bauer, F. E., Chapman, S. C. Smail, I., Blain, A. W., Brandt, W. N., & Ivison, R. J. 2005a, ApJ, 632, 736
Alexander, D. M., Brandt, W. N., Hornschemeier, A. E., Garmire, G. P., Schneider, D. M., Bauer, F. E., & Griffiths, R. E. 2001a, AJ, 122, 2156
Alexander, D. M., Smail, I., Bauer, F. E., Chapman, S. C., Blain, A. W., Brandt, W. N., & Ivison, R. J. 2005b, Nature, 434, 738
Alexander, D. M., et al. 2001b, ApJ, 554, 18
Alonso-Herrero, A., Ward, M. J., & Kotilainen, J. K. 1997, MNRAS, 288, 977
Appleton, P. N., et al. 2004, ApJS, 154, 147
Arnaud, K. A. 1996, in ASP Conf. Ser. 101, Astronomical Data Analysis Software and Systems V, ed. G. H. Jacoby & J. Barnes (San Francisco: ASP), 17
Babbedge, T. S. R., et al. 2004, MNRAS, 353, 654
Ballantyne, D. R., Shi, Y., Rieke, G. H., Donley, J. L., Papovich, C., & Rigby, J. R. 2006, ApJ, 653, 1070
Barger, A. J., Cowie, L. L., Brandt, W. N., Capak, P., Garmire, G. P., Hornschemeier, A. E., Steffen, A. T., & Wehner, E. H. 2002, AJ, 124, 1839
Barger, A. J., Cowie, L. L., Mushotzky, R. F., & Richards, E. A. 2001, AJ, 121, 662
Barger, A. J., Cowie, L. L., & Wang, W. 2007, ApJ, 654, 764
Barmby, P., et al. 2006, ApJ, 642, 126
Bassani, L., Dadina, M., Maiolino, R., Salvati, M., Risaliti, G., della Ceca, R., Matt, G., & Zamorani, G. 1999, ApJS, 121, 473
Bassani, L., et al. 2006, ApJ, 636, L65
Beckmann, V., Gehrels, N., Shrader, C. R., & Soldi, S. 2006, ApJ, 638, 642
Berta, S. 2005, Ph.D. thesis, Univ. Padua
Berta, S., Fritz, J., Franceschini, A., Bressan, A., & Pernechele, C. 2003, A&A, 403, 119
Bolzonella, M., Miralles, J.-M., & Pelló, R. 2000, A&A, 363, 476
Bondi, M., et al. 2003, A&A, 403, 857
Borys, C., Smail, I., Chapman, S. C., Blain, A. W., Alexander, D. M., & Ivison, R. J. 2005, ApJ, 635, 853
Brandl, B. R., et al. 2006, ApJ, 653, 1129
Brandt, W. N., et al. 2001, AJ, 122, 2810
Brinkmann, W., Laurent-Muehleisen, S. A., Voges, W., Siebert, J., Becker, R. H., Brotherton, M. S., White, R. L., & Gregg, M. D. 2000, A&A, 356, 445
Brodwin, M., et al. 2006, ApJ, 651, 791
Bruzual, A. G., & Charlot, S. 2003, MNRAS, 344, 1000
Calzetti, D., Armus, L., Bohlin, R. C., Kinney, A. L., Koomneef, J., & Storchi-Bergmann, T. 2000, ApJ, 533, 682
Chiappetti, L., et al. 2005, A&A, 439, 413 (Paper I)
Ciliegi, P., et al. 2005, A&A, 441, 879
Colbert, E. J. M., Heckman, T. M., Ptak, A. F., Strickland, D. K., & Weaver, K. A. 2004, ApJ, 602, 231
Coleman, G. D., Wu, C.-C., & Weedman, D. W. 1980, ApJS, 43, 393
Comastri, A., et al. 2002, preprint (astro-ph/0203019)
Condon, J. J., & Broderick, J. J. 1988, AJ, 96, 30
de Jong, T., Klein, U., Wielebinski, R., & Wunderlich, E. 1985, A&A, 147, L6
Devriendt, J. E. G., Guiderdoni, B., & Sadat, R. 1999, A&A, 350, 381
Dickey, J. M., & Salpeter, E. E. 1984, ApJ, 284, 461
Donley, J. L., Koribalski, B. S., Staveley-Smith, L., Kraan-Korteweg, R. C., Schröder, A., & Henning, P. A. 2006, MNRAS, 369, 1741
Donley, J. L., Rieke, G. H., Rigby, J. R., & Pérez- González, P. G. 2005, ApJ, 634, 169
Dudley, C. C., & Wynn-Williams, C. G. 1997, ApJ, 488, 720
Dye, S., et al. 2006, ApJ, 644, 769
Eckart, M. E., Stem, D., Helfand, D. J., Harrison, F. A., Mao, P. H., & Yost, S. A. 2006, ApJS, 165, 19
Elvis, M., Schreier, E. J., Tonry, J., Davis, M., & Huchra, J. P. 1981, ApJ, 246, 20
Elvis, M., et al. 1994, ApJS, 95, 1
Fabian, A. C. 2004, in Coevolution of Black Holes and Galaxies, ed. L. C. Ho (Cambridge: Cambridge Univ. Press), 446
Fadda, D., Flores, H., Hasinger, G., Franceschini, A., Altieri, B., Cesarsky, C. J., Elbaz, D., & Ferrando, Ph. 2002, A&A, 383, 838
Fioc, M., & Rocca-Volmerange, B. 1997, A&A, 326, 950
Franceschini, A., et al. 2005, AJ, 129, 2074
Garcet O., et al. 2007, A&A, submitted
Gavignaud, I., et al. 2006, A&A, 457, 79
Giacconi, R., et al. 2002, ApJS, 139, 369
Gilli, R., Comastri, A., & Hasinger, G. 2007, A&A, 463, 79
Glikman, E., Gregg, M. D., Lacy, M., Helfand, D. J., Becker, R. H., & White, R. L. 2004, ApJ, 607, 60
Granato, G. L., & Danese, L. 1994, MNRAS, 268, 235
Granato, G. L., Danese, L., & Franceschini, A. 1997, ApJ, 486, 147
Gregg, M. D., Lacy, M., White, R. L., Glikman, E., Helfand, D., Becker, R. H., & Brotherton, M. S. 2002, ApJ, 564, 133
Hasinger, G. 2002, Rev. Mod. Astron., 15, 71
Hatziminaoglou, E., et al. 2005, AJ, 129, 1198
Higdon, J. L., et al. 2005, ApJ, 626, 58
Horst, H., Smette, A., Gandhi, P., & Duschl, W. J. 2006, A&A, 457, L17
Ilbert, O., et al. 2006, A&A, 457, 841
Jarrett, T. H., et al. 2006, AJ, 131, 261
Kim, D.-W., Fabbiano, G., & Trinchieri, G. 1992a, ApJS, 80, 645
_. 1992b, ApJ, 393, 134
Kitsionas, S., Hatziminaoglou, E., Georgakakis, A., & Georgantopoulos, I. 2005, A&A, 434, 475
Lacy, M., Petric, A. O., Sajina, A., Canalizo, G., Storrie-Lombardi, L. J., Armus, L., Fadda, D., & Marleau, F. R. 2007, AJ, 133, 186
Lacy, M., et al. 2004, ApJS, 154, 166
Lawrence, A. 1991, MNRAS, 252, 586
Lawrence, J. F., Shearer, P. M., & Masters, G. 2006, Geophys. Res. Lett., 33, L07315
Le Fèvre, O., et al. 2004, A&A, 417, 839
_. 2005, A&A, 439, 845
Leipski, C., et al. 2007, A&A, 464, 895
Lonsdale, C., et al. 2004, ApJS, 154, 54
Lonsdale, C. J., et al. 2003, PASP, 115, 897
Lutz, D., Maiolino, R., Spoon, H. W. W., & Moorwood, A. F. M. 2004, A&A, 418, 465
Maiolino, R., Salvati, M., Bassani, L., Dadina, M., della Ceca, R., Matt, G., Risaliti, G., & Zamorani, G. 1998, A&A, 338, 781
Maiolino, R., et al. 2003, MNRAS, 344, L59
Marconi, A., Oliva, E., van der Werf, P. P., Maiolino, R., Schreier, E. J., Macchetto, F., & Moorwood, A. F. M. 2000, A&A, 357, 24
Martínez-Sansigre, A., Rawlings, S., Lacy, M., Fadda, D., Jarvis, M. J., Marleau, F. R., Simpson, C., & Willott, C. J. 2006, MNRAS, 370, 1479
McCracken, H. J., et al. 2003, A&A, 410, 17
Moran, E. C., Filippenko, A. V., & Chornock, R. 2002, ApJ, 579, L71
Morrison, G., et al. 2007, in ASP Conf. Ser., The Spitzer Science Center 2005 Conference: Infrared Diagnostics of Galaxy Evolution, ed. R.-R. Chary (San Francisco: ASP), in press (astro-ph/0603412)
Mulchaey, J. S., Koratkar, A., Ward, M. J., Wilson, A. S., Whittle, M., Antonucci, R. R. J., Kinney, A. L., & Hurt, T. 1994, ApJ, 436, 586
Page, M. J., et al. 2003, Astron. Nachr., 324, 101
Perola, G. C., et al. 2004, A&A, 421, 491
Persic, M., Rephaeli, Y., Braito, V., Cappi, M., Della Ceca, R., & Franceschini, A., & Gruber, D. E. 2004, A&A, 419, 849
Pierre, M., et al. 2004, J. Cosmol. Astropart. Phys., 9, 11
_. 2007, MNRAS, submitted
Polletta, M., et al. 2006, ApJ, 642, 673
Ranalli, P., Comastri, A., & Setti, G. 2003, A&A, 399, 39
Rigby, J. R., Rieke, G. H., Donley, J. L., Alonso-Herrero, A., & Pérez-González, P. G. 2006, ApJ, 645, 115
Rigby, J. R., Rieke, G. H., Pérez-González, P. G., Donley, J. L., Alonso-Herrero, A., Huang, J.-S., Barmby, P., & Fazio, G. G. 2005, ApJ, 627, 134
Risaliti, G., Maiolino, R., & Salvati, M. 1999, ApJ, 522, 157
Rosati, P., et al. 2002, ApJ, 566, 667
Rowan-Robinson, M., et al. 2005, AJ, 129, 1183
Roy, A. L., Norris, R. P., Kesteven, M. J., Troup, E. R., & Reynolds, J. E. 1998, MNRAS, 301, 1019
Sanders, D. B., Phinney, E. S., Neugebauer, G., Soifer, B. T., & Matthews, K. 1989, ApJ, 347, 29
Schmidt, M., & Green, R. F. 1983, ApJ, 269, 352
Severgnini, P., et al. 2003, A&A, 406, 483
Silva, L., Granato, G. L., Bressan, A., & Danese, L. 1998, ApJ, 509, 103
Silva, L., Maiolino, R., & Granato, G. L. 2004, MNRAS, 355, 973
