Search for gamma-ray emission from X-ray-selected Seyfert galaxies with Fermi-lat

M. Ackermann; M. Ajello; A. Allafort; L. Baldini; J. Ballet; G. Barbiellini; D. Bastieri; K. Bechtol; R. Bellazzini; B. Berenji; E. D. Bloom; E. Bonamente; A. W. Borgland; J. Bregeon; M. Brigida; P. Bruel; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; J. M. Casandjian; E. Cavazzuti; C. Cecchi; E. Charles; A. Chekhtman; C. C. Cheung; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; J. Conrad; S. Cutini; F. D'Ammando; A. De Angelis; F. De Palma; C. D. Dermer; E. Do Couto E Silva; P. S. Drell; A. Drlica-Wagner; T. Enoto; C. Favuzzi; S. J. Fegan; E. C. Ferrara; P. Fortin; Y. Fukazawa; P. Fusco; F. Gargano; D. Gasparrini; N. Gehrels; S. Germani; N. Giglietto; P. Giommi; F. Giordano; M. Giroletti; G. Godfrey; J. E. Grove; S. Guiriec; D. Hadasch; M. Hayashida; E. Hays; R. E. Hughes; G. Jóhannesson; A. S. Johnson; T. Kamae; H. Katagiri; J. Kataoka; J. Knödlseder; M. Kuss; J. Lande; M. Llena Garde; F. Longo; F. Loparco; B. Lott; M. N. Lovellette; P. Lubrano; G. M. Madejski; M. N. Mazziotta; P. F. Michelson; T. Mizuno; C. Monte; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; S. Nishino; J. P. Norris; E. Nuss; M. Ohno; T. Ohsugi; A. Okumura; E. Orlando; M. Ozaki; D. Paneque; M. Pesce-Rollins; M. Pierbattista; F. Piron; G. Pivato; T. A. Porter; S. Rainò; R. Rando; M. Razzano; A. Reimer; O. Reimer; S. Ritz; M. Roth; D. A. Sanchez; C. Sbarra; C. Sgrò; E. J. Siskind; G. Spandre; P. Spinelli; Stawarz; A. W. Strong; H. Takahashi; T. Takahashi; T. Tanaka; J. B. Thayer; D. J. Thompson; L. Tibaldo; M. Tinivella; D. F. Torres; G. Tosti; E. Troja; Y. Uchiyama; T. L. Usher; J. Vandenbroucke; V. Vasileiou; G. Vianello; V. Vitale; A. P. Waite; B. L. Winer; K. S. Wood; M. Wood; Z. Yang; S. Zimmer

doi:10.1088/0004-637X/747/2/104

Search for gamma-ray emission from X-ray-selected Seyfert galaxies with Fermi-lat

M. Ackermann
, M. Ajello
, A. Allafort
, L. Baldini
, J. Ballet
, G. Barbiellini
, D. Bastieri
, K. Bechtol
, R. Bellazzini
, B. Berenji
, E. D. Bloom
, E. Bonamente
, A. W. Borgland
, J. Bregeon
, M. Brigida
, P. Bruel
, R. Buehler
, S. Buson
, G. A. Caliandro
, R. A. Cameron

P. A. Caraveo, J. M. Casandjian, E. Cavazzuti, C. Cecchi, E. Charles, A. Chekhtman, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, S. Cutini, F. D'Ammando, A. De Angelis, F. De Palma, C. D. Dermer, E. Do Couto E Silva, P. S. Drell, A. Drlica-Wagner, T. Enoto, C. Favuzzi, S. J. Fegan, E. C. Ferrara, P. Fortin, Y. Fukazawa, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, G. Godfrey, J. E. Grove, S. Guiriec, D. Hadasch, M. Hayashida, E. Hays, R. E. Hughes, G. Jóhannesson, A. S. Johnson, T. Kamae, H. Katagiri, J. Kataoka, J. Knödlseder, M. Kuss, J. Lande, M. Llena Garde, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, G. M. Madejski, M. N. Mazziotta, P. F. Michelson, T. Mizuno, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, S. Nishino, J. P. Norris, E. Nuss, M. Ohno, T. Ohsugi, A. Okumura, E. Orlando, M. Ozaki, D. Paneque, M. Pesce-Rollins, M. Pierbattista, F. Piron, G. Pivato, T. A. Porter, S. Rainò, R. Rando, M. Razzano, A. Reimer, O. Reimer, S. Ritz, M. Roth, D. A. Sanchez, C. Sbarra, C. Sgrò, E. J. Siskind, G. Spandre, P. Spinelli, Stawarz, A. W. Strong, H. Takahashi, T. Takahashi, T. Tanaka, J. B. Thayer, D. J. Thompson, L. Tibaldo, M. Tinivella, D. F. Torres, G. Tosti, E. Troja, Y. Uchiyama, T. L. Usher, J. Vandenbroucke, V. Vasileiou, G. Vianello, V. Vitale, A. P. Waite, B. L. Winer, K. S. Wood, M. Wood, Z. Yang, S. Zimmer

Stanford University
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Universite Paris-Saclay
INFN Sezione di Trieste
University of Trieste
INFN
University of Padova
INFN Sezione di Perugia
University of Perugia
Politecnico di Bari
INFN Sezione di Bari
University of Sheffield
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
Science and Research Directorate
Artep Inc.
Naval Research Laboratory
National Research Council
ASI Science Data Center
Laboratoire Univers et Particules de Montpellier
Stockholm University
Oskar Klein Centre
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo
INAF-IASF
and Physics University of Udine
NASA Goddard Space Flight Center
Hiroshima University
INAF Istituto di Radioastronomia
Center for Space Plasma and Aeronomic Research
Kyoto University
The Ohio State University
University of Iceland
Ibaraki University
Waseda University
IRAP/CNRS
UMR 5797
Sezione di Roma
Boise State University
ISAS/JAXA
Max Planck Institut für Extraterrestrische Physik
Max-Planck-Institut für Physik
University of California at Santa Cruz
Medical University of Innsbruck
University of Washington
Max-Planck-Institut für Kernphysik
NYCB Real-Time Computing Inc.
Jagiellonian University
Pompeu Fabra University (UPF)
Consorzio Interuniversitario per la Fisica Spaziale (CIFS)
University of Rome “Tor Vergata”

Résultats de recherche: Contribution à un journal › Article › Revue par des pairs

Résumé

We report on a systematic investigation of the γ-ray properties of 120 hard X-ray-selected Seyfert galaxies classified as "radio-quiet" objects, utilizing the three-year accumulation of Fermi Large Area Telescope (LAT) data. Our sample of Seyfert galaxies is selected using the Swift Burst Alert Telescope 58 month catalog, restricting the analysis to the bright sources with average hard X-ray fluxes F_{14 - 195 keV} ≥ 2.5 × 10^-11erg cm^-2 s^-1at high Galactic latitudes (|b| > 10°). In order to remove "radio-loud" objects from the sample, we use the "hard X-ray radio loudness parameter," R _rX, defined as the ratio of the total 1.4 GHz radio to 14-195 keV hard X-ray energy fluxes. Among 120 X-ray bright Seyfert galaxies with R _rX <10^-4, we did not find a statistically significant γ-ray excess (TS > 25) positionally coincident with any target Seyferts, with possible exceptions of ESO 323-G077 and NGC6814. The mean value of the 95% confidence level γ-ray upper limit for the integrated photon flux above 100MeV from the analyzed Seyferts is ≃ 4 × 10 ^-9photons cm^-2 s^-1, and the upper limits derived for several objects reach ≃ 1 × 10^-9photons cm^-2 s^-1. Our results indicate that no prominent γ-ray emission component related to active galactic nucleus activity is present in the spectra of Seyferts around GeV energies. The Fermi-LAT upper limits derived for our sample probe the ratio of γ-ray to X-ray luminosities L_γ/L_X < 0.1, and even <0.01 in some cases. The obtained results impose novel constraints on the models for high-energy radiation of "radio-quiet" Seyfert galaxies.

langue originale	Anglais
Numéro d'article	104
journal	Astrophysical Journal
Volume	747
Numéro de publication	2
Les DOIs	https://doi.org/10.1088/0004-637X/747/2/104
état	Publié - 10 mars 2012

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10.1088/0004-637X/747/2/104

Contient cette citation

Ackermann, M., Ajello, M., Allafort, A., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Berenji, B., Bloom, E. D., Bonamente, E., Borgland, A. W., Bregeon, J., Brigida, M., Bruel, P., Buehler, R., Buson, S., Caliandro, G. A., ... Zimmer, S. (2012). Search for gamma-ray emission from X-ray-selected Seyfert galaxies with Fermi-lat. Astrophysical Journal, 747(2), Article 104. https://doi.org/10.1088/0004-637X/747/2/104

@article{876cfaa4fb76448591feb35f638305ef,

title = "Search for gamma-ray emission from X-ray-selected Seyfert galaxies with Fermi-lat",

abstract = "We report on a systematic investigation of the γ-ray properties of 120 hard X-ray-selected Seyfert galaxies classified as {"}radio-quiet{"} objects, utilizing the three-year accumulation of Fermi Large Area Telescope (LAT) data. Our sample of Seyfert galaxies is selected using the Swift Burst Alert Telescope 58 month catalog, restricting the analysis to the bright sources with average hard X-ray fluxes F14 - 195 keV ≥ 2.5 × 10-11erg cm-2 s-1at high Galactic latitudes (|b| > 10°). In order to remove {"}radio-loud{"} objects from the sample, we use the {"}hard X-ray radio loudness parameter,{"} R rX, defined as the ratio of the total 1.4 GHz radio to 14-195 keV hard X-ray energy fluxes. Among 120 X-ray bright Seyfert galaxies with R rX <10-4, we did not find a statistically significant γ-ray excess (TS > 25) positionally coincident with any target Seyferts, with possible exceptions of ESO 323-G077 and NGC6814. The mean value of the 95\% confidence level γ-ray upper limit for the integrated photon flux above 100MeV from the analyzed Seyferts is ≃ 4 × 10 -9photons cm-2 s-1, and the upper limits derived for several objects reach ≃ 1 × 10-9photons cm-2 s-1. Our results indicate that no prominent γ-ray emission component related to active galactic nucleus activity is present in the spectra of Seyferts around GeV energies. The Fermi-LAT upper limits derived for our sample probe the ratio of γ-ray to X-ray luminosities Lγ/LX < 0.1, and even <0.01 in some cases. The obtained results impose novel constraints on the models for high-energy radiation of {"}radio-quiet{"} Seyfert galaxies.",

keywords = "X-rays: galaxies, accretion, accretion disks, galaxies: Seyfert, galaxies: active, gamma rays: galaxies",

author = "M. Ackermann and M. Ajello and A. Allafort and L. Baldini and J. Ballet and G. Barbiellini and D. Bastieri and K. Bechtol and R. Bellazzini and B. Berenji and Bloom, \{E. D.\} and E. Bonamente and Borgland, \{A. W.\} and J. Bregeon and M. Brigida and P. Bruel and R. Buehler and S. Buson and Caliandro, \{G. A.\} and Cameron, \{R. A.\} and Caraveo, \{P. A.\} and Casandjian, \{J. M.\} and E. Cavazzuti and C. Cecchi and E. Charles and A. Chekhtman and Cheung, \{C. C.\} and J. Chiang and S. Ciprini and R. Claus and J. Cohen-Tanugi and J. Conrad and S. Cutini and F. D'Ammando and \{De Angelis\}, A. and \{De Palma\}, F. and Dermer, \{C. D.\} and \{Do Couto E Silva\}, E. and Drell, \{P. S.\} and A. Drlica-Wagner and T. Enoto and C. Favuzzi and Fegan, \{S. J.\} and Ferrara, \{E. C.\} and P. Fortin and Y. Fukazawa and P. Fusco and F. Gargano and D. Gasparrini and N. Gehrels and S. Germani and N. Giglietto and P. Giommi and F. Giordano and M. Giroletti and G. Godfrey and Grove, \{J. E.\} and S. Guiriec and D. Hadasch and M. Hayashida and E. Hays and Hughes, \{R. E.\} and G. J{\'o}hannesson and Johnson, \{A. S.\} and T. Kamae and H. Katagiri and J. Kataoka and J. Kn{\"o}dlseder and M. Kuss and J. Lande and Garde, \{M. Llena\} and F. Longo and F. Loparco and B. Lott and Lovellette, \{M. N.\} and P. Lubrano and Madejski, \{G. M.\} and Mazziotta, \{M. N.\} and Michelson, \{P. F.\} and T. Mizuno and C. Monte and Monzani, \{M. E.\} and A. Morselli and Moskalenko, \{I. V.\} and S. Murgia and S. Nishino and Norris, \{J. P.\} and E. Nuss and M. Ohno and T. Ohsugi and A. Okumura and E. Orlando and M. Ozaki and D. Paneque and M. Pesce-Rollins and M. Pierbattista and F. Piron and G. Pivato and Porter, \{T. A.\} and S. Rain{\`o} and R. Rando and M. Razzano and A. Reimer and O. Reimer and S. Ritz and M. Roth and Sanchez, \{D. A.\} and C. Sbarra and C. Sgr{\`o} and Siskind, \{E. J.\} and G. Spandre and P. Spinelli and Stawarz and Strong, \{A. W.\} and H. Takahashi and T. Takahashi and T. Tanaka and Thayer, \{J. B.\} and Thompson, \{D. J.\} and L. Tibaldo and M. Tinivella and Torres, \{D. F.\} and G. Tosti and E. Troja and Y. Uchiyama and Usher, \{T. L.\} and J. Vandenbroucke and V. Vasileiou and G. Vianello and V. Vitale and Waite, \{A. P.\} and Winer, \{B. L.\} and Wood, \{K. S.\} and M. Wood and Z. Yang and S. Zimmer",

year = "2012",

month = mar,

day = "10",

doi = "10.1088/0004-637X/747/2/104",

language = "English",

volume = "747",

journal = "Astrophysical Journal",

issn = "0004-637X",

number = "2",

}

Ackermann, M, Ajello, M, Allafort, A, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Berenji, B, Bloom, ED, Bonamente, E, Borgland, AW, Bregeon, J, Brigida, M, Bruel, P, Buehler, R, Buson, S, Caliandro, GA, Cameron, RA, Caraveo, PA, Casandjian, JM, Cavazzuti, E, Cecchi, C, Charles, E, Chekhtman, A, Cheung, CC, Chiang, J, Ciprini, S, Claus, R, Cohen-Tanugi, J, Conrad, J, Cutini, S, D'Ammando, F, De Angelis, A, De Palma, F, Dermer, CD, Do Couto E Silva, E, Drell, PS, Drlica-Wagner, A, Enoto, T, Favuzzi, C, Fegan, SJ, Ferrara, EC, Fortin, P, Fukazawa, Y, Fusco, P, Gargano, F, Gasparrini, D, Gehrels, N, Germani, S, Giglietto, N, Giommi, P, Giordano, F, Giroletti, M, Godfrey, G, Grove, JE, Guiriec, S, Hadasch, D, Hayashida, M, Hays, E, Hughes, RE, Jóhannesson, G, Johnson, AS, Kamae, T, Katagiri, H, Kataoka, J, Knödlseder, J, Kuss, M, Lande, J, Garde, ML, Longo, F, Loparco, F, Lott, B, Lovellette, MN, Lubrano, P, Madejski, GM, Mazziotta, MN, Michelson, PF, Mizuno, T, Monte, C, Monzani, ME, Morselli, A, Moskalenko, IV, Murgia, S, Nishino, S, Norris, JP, Nuss, E, Ohno, M, Ohsugi, T, Okumura, A, Orlando, E, Ozaki, M, Paneque, D, Pesce-Rollins, M, Pierbattista, M, Piron, F, Pivato, G, Porter, TA, Rainò, S, Rando, R, Razzano, M, Reimer, A, Reimer, O, Ritz, S, Roth, M, Sanchez, DA, Sbarra, C, Sgrò, C, Siskind, EJ, Spandre, G, Spinelli, P, Stawarz, Strong, AW, Takahashi, H, Takahashi, T, Tanaka, T, Thayer, JB, Thompson, DJ, Tibaldo, L, Tinivella, M, Torres, DF, Tosti, G, Troja, E, Uchiyama, Y, Usher, TL, Vandenbroucke, J, Vasileiou, V, Vianello, G, Vitale, V, Waite, AP, Winer, BL, Wood, KS, Wood, M, Yang, Z & Zimmer, S 2012, 'Search for gamma-ray emission from X-ray-selected Seyfert galaxies with Fermi-lat', Astrophysical Journal, VOL. 747, Numéro 2, 104. https://doi.org/10.1088/0004-637X/747/2/104

TY - JOUR

T1 - Search for gamma-ray emission from X-ray-selected Seyfert galaxies with Fermi-lat

AU - Ackermann, M.

AU - Ajello, M.

AU - Allafort, A.

AU - Baldini, L.

AU - Ballet, J.

AU - Barbiellini, G.

AU - Bastieri, D.

AU - Bechtol, K.

AU - Bellazzini, R.

AU - Berenji, B.

AU - Bloom, E. D.

AU - Bonamente, E.

AU - Borgland, A. W.

AU - Bregeon, J.

AU - Brigida, M.

AU - Bruel, P.

AU - Buehler, R.

AU - Buson, S.

AU - Caliandro, G. A.

AU - Cameron, R. A.

AU - Caraveo, P. A.

AU - Casandjian, J. M.

AU - Cavazzuti, E.

AU - Cecchi, C.

AU - Charles, E.

AU - Chekhtman, A.

AU - Cheung, C. C.

AU - Chiang, J.

AU - Ciprini, S.

AU - Claus, R.

AU - Cohen-Tanugi, J.

AU - Conrad, J.

AU - Cutini, S.

AU - D'Ammando, F.

AU - De Angelis, A.

AU - De Palma, F.

AU - Dermer, C. D.

AU - Do Couto E Silva, E.

AU - Drell, P. S.

AU - Drlica-Wagner, A.

AU - Enoto, T.

AU - Favuzzi, C.

AU - Fegan, S. J.

AU - Ferrara, E. C.

AU - Fortin, P.

AU - Fukazawa, Y.

AU - Fusco, P.

AU - Gargano, F.

AU - Gasparrini, D.

AU - Gehrels, N.

AU - Germani, S.

AU - Giglietto, N.

AU - Giommi, P.

AU - Giordano, F.

AU - Giroletti, M.

AU - Godfrey, G.

AU - Grove, J. E.

AU - Guiriec, S.

AU - Hadasch, D.

AU - Hayashida, M.

AU - Hays, E.

AU - Hughes, R. E.

AU - Jóhannesson, G.

AU - Johnson, A. S.

AU - Kamae, T.

AU - Katagiri, H.

AU - Kataoka, J.

AU - Knödlseder, J.

AU - Kuss, M.

AU - Lande, J.

AU - Garde, M. Llena

AU - Longo, F.

AU - Loparco, F.

AU - Lott, B.

AU - Lovellette, M. N.

AU - Lubrano, P.

AU - Madejski, G. M.

AU - Mazziotta, M. N.

AU - Michelson, P. F.

AU - Mizuno, T.

AU - Monte, C.

AU - Monzani, M. E.

AU - Morselli, A.

AU - Moskalenko, I. V.

AU - Murgia, S.

AU - Nishino, S.

AU - Norris, J. P.

AU - Nuss, E.

AU - Ohno, M.

AU - Ohsugi, T.

AU - Okumura, A.

AU - Orlando, E.

AU - Ozaki, M.

AU - Paneque, D.

AU - Pesce-Rollins, M.

AU - Pierbattista, M.

AU - Piron, F.

AU - Pivato, G.

AU - Porter, T. A.

AU - Rainò, S.

AU - Rando, R.

AU - Razzano, M.

AU - Reimer, A.

AU - Reimer, O.

AU - Ritz, S.

AU - Roth, M.

AU - Sanchez, D. A.

AU - Sbarra, C.

AU - Sgrò, C.

AU - Siskind, E. J.

AU - Spandre, G.

AU - Spinelli, P.

AU - Stawarz,

AU - Strong, A. W.

AU - Takahashi, H.

AU - Takahashi, T.

AU - Tanaka, T.

AU - Thayer, J. B.

AU - Thompson, D. J.

AU - Tibaldo, L.

AU - Tinivella, M.

AU - Torres, D. F.

AU - Tosti, G.

AU - Troja, E.

AU - Uchiyama, Y.

AU - Usher, T. L.

AU - Vandenbroucke, J.

AU - Vasileiou, V.

AU - Vianello, G.

AU - Vitale, V.

AU - Waite, A. P.

AU - Winer, B. L.

AU - Wood, K. S.

AU - Wood, M.

AU - Yang, Z.

AU - Zimmer, S.

PY - 2012/3/10

Y1 - 2012/3/10

N2 - We report on a systematic investigation of the γ-ray properties of 120 hard X-ray-selected Seyfert galaxies classified as "radio-quiet" objects, utilizing the three-year accumulation of Fermi Large Area Telescope (LAT) data. Our sample of Seyfert galaxies is selected using the Swift Burst Alert Telescope 58 month catalog, restricting the analysis to the bright sources with average hard X-ray fluxes F14 - 195 keV ≥ 2.5 × 10-11erg cm-2 s-1at high Galactic latitudes (|b| > 10°). In order to remove "radio-loud" objects from the sample, we use the "hard X-ray radio loudness parameter," R rX, defined as the ratio of the total 1.4 GHz radio to 14-195 keV hard X-ray energy fluxes. Among 120 X-ray bright Seyfert galaxies with R rX <10-4, we did not find a statistically significant γ-ray excess (TS > 25) positionally coincident with any target Seyferts, with possible exceptions of ESO 323-G077 and NGC6814. The mean value of the 95% confidence level γ-ray upper limit for the integrated photon flux above 100MeV from the analyzed Seyferts is ≃ 4 × 10 -9photons cm-2 s-1, and the upper limits derived for several objects reach ≃ 1 × 10-9photons cm-2 s-1. Our results indicate that no prominent γ-ray emission component related to active galactic nucleus activity is present in the spectra of Seyferts around GeV energies. The Fermi-LAT upper limits derived for our sample probe the ratio of γ-ray to X-ray luminosities Lγ/LX < 0.1, and even <0.01 in some cases. The obtained results impose novel constraints on the models for high-energy radiation of "radio-quiet" Seyfert galaxies.

AB - We report on a systematic investigation of the γ-ray properties of 120 hard X-ray-selected Seyfert galaxies classified as "radio-quiet" objects, utilizing the three-year accumulation of Fermi Large Area Telescope (LAT) data. Our sample of Seyfert galaxies is selected using the Swift Burst Alert Telescope 58 month catalog, restricting the analysis to the bright sources with average hard X-ray fluxes F14 - 195 keV ≥ 2.5 × 10-11erg cm-2 s-1at high Galactic latitudes (|b| > 10°). In order to remove "radio-loud" objects from the sample, we use the "hard X-ray radio loudness parameter," R rX, defined as the ratio of the total 1.4 GHz radio to 14-195 keV hard X-ray energy fluxes. Among 120 X-ray bright Seyfert galaxies with R rX <10-4, we did not find a statistically significant γ-ray excess (TS > 25) positionally coincident with any target Seyferts, with possible exceptions of ESO 323-G077 and NGC6814. The mean value of the 95% confidence level γ-ray upper limit for the integrated photon flux above 100MeV from the analyzed Seyferts is ≃ 4 × 10 -9photons cm-2 s-1, and the upper limits derived for several objects reach ≃ 1 × 10-9photons cm-2 s-1. Our results indicate that no prominent γ-ray emission component related to active galactic nucleus activity is present in the spectra of Seyferts around GeV energies. The Fermi-LAT upper limits derived for our sample probe the ratio of γ-ray to X-ray luminosities Lγ/LX < 0.1, and even <0.01 in some cases. The obtained results impose novel constraints on the models for high-energy radiation of "radio-quiet" Seyfert galaxies.

KW - X-rays: galaxies

KW - accretion, accretion disks

KW - galaxies: Seyfert

KW - galaxies: active

KW - gamma rays: galaxies

U2 - 10.1088/0004-637X/747/2/104

DO - 10.1088/0004-637X/747/2/104

M3 - Article

AN - SCOPUS:84859731298

SN - 0004-637X

VL - 747

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 104

ER -

Search for gamma-ray emission from X-ray-selected Seyfert galaxies with Fermi-lat

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