Results 11 to 20 of about 71 (64)

The Search for Very High Energy γ-rays from Misaligned AGN [PDF]

, 2013
The aim of this work is to study the potential for emission at very high energies (100 GeV) by misaligned active galactic nuclei (AGN) and the future prospects for observations of these objects with the next generation imaging atmospheric Cherenkov ...
CHEESEBROUGH, ALISTAIR
core  

VHE gamma-ray emission of PKS 2155-304 : spectral and temporal variability

, 2010
Context. Observations of very high-energy.-rays from blazars provide information about acceleration mechanisms occurring in their innermost regions. Studies of variability in these objects lead to a better understanding of the mechanisms in play.
Ryde, Felix,, Abramowski, A., HESS Collaboration, et. al.   +3 more
core   +1 more source

Luminous and high-frequency peaked blazars: the origin of the γ-ray emission from PKS 1424+240

, 2017
International audienceContext. The current generation of ground-based Cherenkov telescopes, together with the LAT instrument on-board the Fermi satellite, have greatly increased our knowledge of γ-ray blazars.
K. Shahinyan, L. F. Fortson, Fortson, L. F., Cerruti, M., Fortson, L.F., W. Benbow, Chen, X., Dumm, J.P., Shahinyan, K., Chen, Xu, Chen, Xuhui, Dumm, Jonathan P.,, Benbow, W., M. Cerruti, J. P. Dumm, Dumm, J. P., X. Chen   +16 more
core   +1 more source

Variability study of the Hβ emission line in the blazar PKS 1510-089 [PDF]

, 2023
Blazars are a type of active galactic nucleus (AGN) characterized by their intense and variable emissions across the electromagnetic spec- trum, from radio to -rays.
Alfredo Amador-Portes
core  

On the Connection Between the Gamma-ray and (Sub-)mm Emission in Active Galactic Nuclei [PDF]

, 2016
This research investigates the connection between the submillimetre (sub-mm), millimetre (mm) and gamma-ray emission in a sample eight blazars (consisting of high- and intermediate-frequency peaked BL Lacertae Objects (HBLs and IBLs respectively) as well
BALENDERAN, SHANGKARI
core  

THE SECOND CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE

, 2011
The second catalog of active galactic nuclei (AGNs) detected by the Fermi Large Area Telescope (LAT) in two years of scientific operation is presented. The second LAT AGN catalog (2LAC) includes 1017 γ-ray sources located at high Galactic latitudes (|b| &
Bonamente, E., Uchiyama Y, Bellazzini R., Fortin, P., Torres DF, W. Mitthumsiri, Grove JE, Scargle JD, do Couto e. Silva E, F. Ormes, J., Bechtol, K., Cohen-Tanugi J, LOPARCO, FRANCESCO, Schalk T. L., Takahashi, H., Lande J., Caliandro GA, J. B. Thayer, P. S. Drell, Mcconville, W., RAINO', SILVIA, Drell P. S., Wood, K. S., D. Bloom, E., Vitale V., T. Tanaka, W. McConville, A. . Angelis, Strong AW, Rando, R., Cavazzuti E, Fukazawa, Y., Omodei, N., J. Cohen Tanugi, Waite, A., Katagiri H., Baldini, Luca, F. . Palma, E. Cavazzuti, G. Iafrate, Blandford, R. D., Parent, D., Godfrey G., Vasileiou, V., C. Ferrara, E., BASTIERI, DENIS, J. Kn\odlseder, Rochester L. S., Razzano M, A. Allafort, D. Gasparrini, Berenji B., Nuss E., Germani S., Rochester, L. S., Bastieri D., Ohsugi T., Siskind, E. J., Kataoka, J., J. Ballet, Johnson A. S., Bechtol K, Rochester LS, Blandford, R., Silva, E. do Couto e., M. Naumann-Godo, Hayashida M, Larsson, S., D. Scargle, J., Giommi, P., J. Thompson, D., Madejski GM, Allafort, A., Horan D., Pesce-Rollins M, Hou X, Focke W. B., M. Naumann Godo, Murgia, S., Murgia S., Fegan, S. J., M. Brigida, S. J. Fegan, Grenier, I., E. Moretti, Giroletti M, E. do Couto e. Silva, Healey S. E., Piron, F., Naumann-Godo M, Kamae, T., Kataoka J, Baldini L, L. Baldini, Spinelli P, Gehrels N, Borgland, A., Guiriec, S., Porter TA, T. Kamae, E. Bonamente, P. A. Caraveo, Caraveo, P., Cutini S., Dermer, C., Finke J, Tosti G, Vianello G., Loparco F, A. Caliandro, G., Pesce Rollins M, Wood K. S., K. Bechtol, Hou X., B. Berenji, Burnett T. H., F. de Palma, O. Reimer, Hadasch D, Madejski G. M., A. Cameron, R., Torres, D., Hays E, de Palma F., Omodei N, Chiang J., Thayer J. B., Michelson PF, Morselli, A., G. Godfrey, P. Waite, A., L. Costamante, V. Vasileiou, I. A. Grenier, G. Tosti, E. Hays, McEnery, J., Allafort A., Troja, E., Uchiyama, Y., Drell PS, R. A. Cameron, GIORDANO, FRANCESCO, Ackermann M., Casandjian JM, Okumura A, Caraveo, P. A., Dubois R., Knödlseder, Jürgen, C. Cheung, C., F. Torres, D., Lande J, M. Ackermann, Hayashida M., Schalk, T. L., Schalk TL, P. Norris, J., M. Madejski, G., Healey, S. E., Ormes J. F., M. Giroletti, Orlando E., Nakamori, T., Bloom, E. D., Grenier, I. A., Drell, P., Pierbattista, M., Lott, B., Ritz S., Glanzman, T., Wallace E., Fukazawa Y, Tibaldo, L., Brigida, M., Ormes JF, Thayer J. G., Hughes R. E., D. L. Wood, L. Escande, LONGO, FRANCESCO, Nakamori T., Winer B. L., Johnson AS, S. Shaw, M., Rochester, L., T. Glanzman, Kuss M, Mcenery, J. E., Winer, B., T. H. Burnett, Lovellette, M., Hadasch, D., Moskalenko I. V., G. Pivato, Gehrels N., Spandre G., Buehler, R., Kamae T., Bottacini, E., H. Burnett, T., Bouvier, A., Jóhannesson, G., RANDO, RICCARDO, J. D. Scargle, D. J. Thompson, Vandenbroucke, J., Borgland, A. W., Strong, A., Thompson, D., Knödlseder, J., L. S. Rochester, Guiriec S., Takahashi H., Paneque, D., Fukazawa Y., Gargano F., D. Blandford, R., Ritz S, Pierbattista M., J. Suson, D., Focke, W., Hays, E., Sanchez DA, J. Knodlseder, Razzano, M., Nakamori T, Ballet J, Porter T. A., Caraveo P. A., Cavazzuti, E., Germani S, J. Chiang, B. L. Winer, S. Drell, P., Bruel P, Omodei N., Thompson DJ, Frailis M, Monzani, M. E., G. M. Madejski, Nolan, P., Thayer, J. B., Suson D. J., Norris JP, Bruel, P., Latronico, L., Casandjian, J. M., Lubrano P., Moretti, E., Digel, S. W., J. Conrad, W. B. Focke, Monzani M. E., Lubrano, P., Hughes, R. E., Latronico L, Conrad, Jan,, Pierbattista M, Spinelli, P., Paneque D., L. Schalk, T., Barbiellini G, A. Grenier, I., Baldini, L., Ajello M, Larsson S., P. Fusco, Wood KS, Ballet, J., Shaw, M. S., S. Cutini, S. Guiriec, S. Wood, K., A. Morselli, Chiang, J., Reimer O, Atwood, W., Norris, J., D. J. Suson, Tajima H., Thayer, J. G., E. do Couto e Silva, Bloom, E., Mitthumsiri, W., Reimer A, Naumann-Godo, M., Scargle, J., Piron F, Kamae T, W. N. Johnson, R. Bellazzini, Reimer, A., Wallace E, Winer, B. L., Moiseev AA, Ormes, J., Giglietto N., Digel S. W., Norris J. P., Lott B, C. Sgro, N. Mazziotta, M., Katagiri H, Longo F., C. Sbarra, Romani RW, Morselli A., Tinivella M, Focke, W. B., J'Ohannesson, G., Troja E., BOTTACINI, EUGENIO ALESSIO, Johnson W. N., Siskind EJ, Wang P., S. Johnson, A., de Palma, F., Mazziotta, M. N., Giebels, B., Naumann Godo M, Winer BL, Bonamente E., R. Rando, M. Orienti, Claus, R., Iafrate G, Moskalenko IV, do Couto e. Silva E., B. Giebels, Horan D, Ohno M., Johannesson G., Monzani, M., Tibaldo L., Hayashida, M., D. Paneque, Nuss E, D. Dermer, C., Ackermann M, Thayer, J., Mazziotta M. N., Morselli A, Strong A. W., Godfrey, G., E. Monzani, M., Roth M, Nolan, P. L., S. Rochester, L., Okumura, A., Wood DL, Johnson, W., Reimer, O., Cheung CC, Sbarra C, Vandenbroucke J, P. L. Nolan, Ferrara EC, R. W. Romani, Sanchez, D., Suson, D. J., S. Zimmer, Tinivella M., Giroletti, M., Bonamente E, C. Cecchi, Michelson, P. F., F. Michelson, P., R. Claus, B. Atwood, W., M. Ozaki, FUSCO, Piergiorgio, Fegan SJ, FAVUZZI, Cecilia, Paneque D, N. Johnson, W., Ajello, Marco, T. L. Schalk, Cavazzuti E., E. Antolini, Lande, J., G. Spandre, Barbiellini, Guido, Giordano F, Y. Uchiyama, W. Borgland, A., Okumura A., Siskind, E., Grove, J. E., Antolini E, G. A. Caliandro, Cameron R. A., Gustafsson M, Glanzman T, Orienti M, Cheung, C., Bechtol K., Moskalenko, I. V., Bastieri, D., P. Lubrano, M. Casandjian, J., A. de Angelis, J. Fegan, S., Frailis, M., Roth M., S. Buson, Mizuno T, Pivato G, Dermer CD, L. Wood, D., J. G. Thayer, Hadasch D., Favuzzi C., Orienti M., Mazziotta, M., E. Wallace, M. N. Lovellette, Porter, T. A., Orlando E, Giglietto, N., M. Gustafsson, Atwood W. B., Gustafsson, M., Orlando, E., Gustafsson M., Siskind E. J., Fusco, P., Sgro C, Gargano, F., Grenier IA, Fusco P, Bloom E. D., Burnett, T., Palma F, Charles, E., Porter, T.A., Gasparrini D, Grove J. E., Cheung, C. C., Antolini, E., Moskalenko, I., McEnery JE, M. Hayashida, F. Longo, Burnett, T. H., M. Pesce Rollins, Escande, L., Tosti, G., Monte C., J. E. Grove, A. P. Waite, Naumann Godo M., Giommi P, Healey SE, Ormes, J. F., Razzaque, S., Pesce-Rollins, M., Vitale V, Nolan P. L., Sgrò, C., Berenji B, Wood D. L., Cheung C. C., de Palma F, N. Giglietto, Bellazzini R, S. Germani, Axelsson M., TIBALDO, LUIGI, S. Piranomonte, Ferrara, E., Piranomonte S., Kuss, M., Buehler R, Zimmer S, Sgr'O, C., Focke WB, de Angelis, A., Thompson, D. J., Grenier I. A., Brigida M, Tosti G., Dubois, R., Finke, J., D. Hadasch, Charles E., E. Troja, Tajima H, Cutini, S., Moretti E., Latronico L., Waite, A. P., Ciprini, S., Longo F, W. Digel, S., Wang, P., Baldini L., H. Tajima, E. d. C., Troja E, Gasparrini, D., Sanchez, D. A., Tinivella, M., Vasileiou V., Hou, X., Favuzzi, C., E. Orlando, Waite A. P., J. Siskind, E., G. Vianello, Ackermann, M., McConville W., Borgland A. W., J. Kataoka, Pesce Rollins M., Hays E., L. Latronico, M. Pesce-Rollins, Blandford RD, Antolini E., Buehler R., S. Razzaque, Giordano, F., B. Focke, W., M. S. Shaw, J. F. Ormes, Cecchi C., C. Sgr\`o, M. Kuss, B. Thayer, J., Cecchi C, Caliandro, G. A., Piron F., B. Lott, Larsson, Stefan,, Gargano F, G. Thayer, J., M. Ohno, M. Axelsson, de Angelis A., Bruel, Pascal, Monte, C., Borgland AW, M. N. Mazziotta, I. V. Moskalenko, Tanaka T., F. Loparco, Porter, T., D. A. Sanchez, H. Takahashi, Buson S, Drell, P. S., Gehrels, N., J. E. McEnery, de Angelis A, Wood, D. L., Mitthumsiri W., P. F. Michelson, Johnson, A. S., F. Giordano, Parent D., Atwood, W. B., Bellazzini, R., Healey, S., Giroletti M., Scargle, J. D., Escande L., A. Okumura, Ferrara, E. C., E. Healey, S., T. Mizuno, Ajello M., Orienti, M., Wood, D., DE ANGELIS, Alessandro, Kataoka J., M. Roth, J. Cohen-Tanugi, Larsson S, Ciprini S, Ferrara E. C., Bottacini E., Pivato, G., Ozaki, M., D. Horan, J. M. Casandjian, Strong, A. W., Cohen Tanugi J., M. Tinivella, L. Tibaldo, A. Bouvier, Casandjian J. M., Axelsson, M., do Couto e Silva E, P. Fortin, Ballet, Jean, Torres, D. F., Spandre, G., Piranomonte S, Moretti E, Frailis M., E. Nuss, Favuzzi C, E. Charles, Hughes RE, Shaw MS, Takahashi T, S. Rain\`o, Bottacini E, Bregeon J., Claus R., Takahashi H, C. Favuzzi, Caliandro G. A., Funk, S., Buson, S., Wallace, E., Knodlseder J., Raino S, M. Frailis, Razzaque S, Madejski, G. M., Moiseev, A., Caliandro, G., Ritz, S., Ozaki M, Funk S, Brigida M., Dubois R, Giglietto N, C. Monte, Cohen-Tanugi, J., Godfrey G, Mizuno T., Caraveo PA, Bregeon J, Costamante, L., McEnery J. E., Tanaka, T., S. Murgia, Romani, R. W., Giebels B, Vianello G, W. Romani, R., Thayer JG, RI Thompson David/D 2939 2012 Gehrels Neil/D 2971 2012 Hays Elizabeth/D 3257 2012 McEnery Julie/D 6612 2012 Baldini Luca/E 5396 2012 lubrano pasquale/F 7269 2012 Kuss Michael/H 8959 2012, Ackermann, Markus, Cameron, R., Digel, S., R. E. Hughes, Dermer C. D., Schalk, T., T. A. Porter, D. Parent, Germani, S., Sanchez D. A., Moiseev A. A., Ozaki M., V. Moskalenko, I., Johannesson G, Sanchez, D.A., Reimer O., Mizuno, T., N. Gehrels, Ballet J., Shaw, M., Claus R, Lott B., Kuss M., Thayer JB, BUSON, SARA, Moiseev, A. A., Berenji, B., Romani, R., Wood, K., Waite AP, L. Nolan, P., Horan, D., Sbarra C., McConville W, M. E. Monzani, Buson S., Pivato G., A. Moiseev, A., V. Vitale, A. S. Johnson, Nuss, E., Loparco, F., Sbarra, C., P. Bruel, Casandjian, J., Cecchi, C., T. Nakamori, E. Grove, J., Murgia S, Piranomonte, S., P. Spinelli, Digel SW, Grove, J., M. Pierbattista, M. Razzano, Rainò, S., K. S. Wood, TINIVELLA, MARCO, Axelsson, Magnus, Roth, M., T. Ohsugi, Cameron, R. A., H. Katagiri, Mazziotta MN, S. Funk, Bouvier A, Takahashi, T., Conrad, J., Ajello, M., Escande L, Johnson WN, S. Larsson, Costamante L., Vianello, G., Scargle J. D., A. W. Borgland, J. Lande, D. Bastieri, Tibaldo L, Giommi P., Michelson, P., Rain'O, S., Costamante L, Bruel P., Vandenbroucke J., Monzani ME, T. Takahashi, S. Ritz, Johnson, A., E. C. Ferrara, A. W. Strong, S. Ciprini, J. Bregeon, J. Vandenbroucke, J. P. Norris, Bastieri D, Fortin P, F. Gargano, Lovellette MN, L. Winer, B., Lubrano P, Barbiellini G., Suson DJ, G. Johannesson, Zimmer, Stephan,, Fegan, S., Torres D. F., Giebels B., Lovellette, M. N., Bloom ED, E. J. Siskind, Vasileiou V, Axelsson M, Cutini S, Burnett TH, E. Hughes, R., X. Hou, E. Bottacini, Iafrate G., Iafrate, G., Guiriec S, Allafort A, Y. Fukazawa, Funk S., Conrad J, Norris, J. P., Dermer, C. D., Longo, F., R. Dubois, Charles E, Nolan PL, Ciprini S., R. Buehler, Cameron RA, Atwood WB, Thompson D. J., Barbiellini, G., Razzano M., A. A. Moiseev, Fegan S. J., Takahashi T., Tanaka T, Finke J., D. F. Torres, A. Reimer, Razzaque S., Hughes, R., Lovellette M. N., Fortin P., E. D. Bloom, C. C. Cheung, Tajima, H., Mitthumsiri W, S. W. Digel, M. Ajello, Bouvier A., Vitale, V., Conrad J., P. Wang, Norris, Jay P., Gasparrini D., Katagiri, H., F. Piron, Ohno, M., Cohen Tanugi J, R. D. Blandford, Zimmer S., Parent D, SPINELLI, Paolo, Spandre G, GIGLIETTO, Nicola, Axelsson, Magnus,, Wang P, J. Finke, Ohno M, Johnson, W. N., RAZZANO, MASSIMILIANO, N. Lovellette, M., Shaw M. S., S. E. Healey, W. Strong, A., N. Omodei, Chiang J, Monte C, Zimmer, S., Madejski, G., E. Mcenery, J., S. Raino, Suson, D., P. Giommi, Do Couto e Silva, E., W. B. Atwood, Knodlseder J, Ohsugi T, C. D. Dermer, Romani R. W., G. Barbiellini, Uchiyama Y., Bregeon, J., Glanzman T., Rando R., Sgro C., Ohsugi, T., Blandford R. D., Michelson P. F., Reimer A., Rando R   +851 more
core   +1 more source

Detection of the bl lacertae object h1426+428 at tev gamma‐ray energies

, 2018
A very high energy gamma-ray signal has been detected at the 5.5sigma level from H1426+ 428, an X-ray-selected BL Lacertae object at a redshift of 0.129.
de la Calle Perez, I., Hall, T. A., Das, D., Finley, J. P., Horan, D., Cui, W., Badran, H. M., D’Vali, M., Carson, M. J., Carter‐Lewis, D. A., Gaidos, J. A., Buckley, J. H., Gillanders, G. H., Gibbs, K., Dunlea, S., Bond, I. H., Catanese, M., Fegan, D. J., Bradbury, S. M., Fegan, S. J.   +19 more
core  

REM near-IR and optical multiband observations of PKS 2155-304 in 2005

, 2007
Context. Spectral variability is the main tool for constraining emission models of BL Lac objects. Aims. By means of systematic observations of the BL Lac prototype PKS 2155-304 in the infrared-optical band, we explore variability on scales of months ...
D'Alessio, F., F. Farfanelli, F. M. Zerbi, V. Testa, P. Conconi, E. Distefano, G. Cutispoto, Distefano, E., Fernández Soto, Alberto, E. Molinari, G. Malaspina, F. D'Alessio, Meurs, E., L. A. Antonelli, Vitali, F., Cutispoto, G., A. Fernandez-Soto, Chincarini, G., Danziger, J., Tosti, G., Ciprini, S., AND CO AUTHORS, Antonelli, L.A., F. Vitali, Conconi, P., E. Pian, Dolcini, A., Malaspina, G., G. Tagliaferri, S. Covino, G. Chincarini, G. Tosti, Nicastro, L., E. Palazzi, A. Treves, S. Vergani, B. Sbarufatti, Farfanelli, F., Zerbi, F.M., Palazzi, E., Molinari, E., DOLCINI A, Tagliaferri, G., TREVES, ALDO, A. Dolcini, Vergani, S., Covino, S., Testa, V., E. Meurs, Treves, A., J. Danziger, Pian, E., S. Ciprini, Sbarufatti, B., L. Nicastro   +54 more
core   +1 more source

X-ray overview of INTEGRAL Blazars [PDF]

, 2010
I quasars Radio Loud (RL) fanno parte di una piccola percentuale (~10%) di Nuclei Galattici Attivi (AGN) e sono caratterizzati da una forte emissione nella banda radio. Lo scopo del nostro lavoro e’ lo studio dell’emissione nella banda dell’X e dell’hard-
Giannì, S, Silvia Gianni, Giannì, Silvia, GIANNI', SILVIA   +3 more
core   +1 more source

Detection Of The Bl Lacertae Object H1426+428 At Tev Gamma-Ray Energies

, 2009
A very high energy γ-ray signal has been detected at the 5.5 σ level from H1426+428, an X-ray-selected BL Lacertae object at a redshift of 0.129. The object was monitored from 1995 to 1998 with the Whipple 10 m imaging atmospheric Cerenkov telescope as ...
al., Et., Reynolds, P. T.
core