MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21

Very high energy (VHE) gamma-ray emission from the flat spectrum radio quasar (FSRQ) PKS 1222+21 (4C 21.35, z = 0.432) was detected with the MAGIC Cherenkov telescopes during a short observation (~0.5 hr) performed on 2010 June 17. The MAGIC detection coincides with high-energy MeV/GeV gamma-ray act...

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Main Authors:	Aleksic, J., Antonelli, L., Antoranz, P., Backes, M., Barrio, J., Bastieri, D., Becerra, J., Bednarek, W., Berduygin, A., Berger, K., Bernardini, E., Biland, A., Blanch, O., Bock, R., Boller, A., Bonnoli, G., Borla Tridon, D., Braun, I., Bretz, T., Cãellas, A., Carmona, E., Carosi, A., Colin, P., Colombo, E., Contreras, J., Cortina, J., Cossio, L., Covino, S., Dazzi, F., de Angelis, A., De Cea Del Pozo, E., De Lotto, B., Delgado, C., Diago Ortega, A., Doert, M., Dominguez, A., Dominis Prester, D., Dorner, D., Doro, M., Elsaesser, D., Ferenc, D., Fonseca, M., Font, L., Fruck, C., Garcia López, R., Garczarczyk, M., Garrido Terrats, D., Giavitto, G., Godinovic, N., Hadasch, D., Häfner, D., Herrero, A., Hildebrand, D., Höhne-Mönch, D., Hose, J., Hrupec, D., Huber, B., Jogler, T., Klepser, S., Krähenbühl, T., Krause, J., La Barbera, A., Lelas, D., Leonardo, E., Lindfors, E., Lombardi, S., López, M., Lorenz, E., Makariev, M., Maneva, G., Mankuzhiyil, N., Mannheim, K., Maraschi, L., Mariotti, M., Martínez, M., Mazin, D., Meucci, M., Miranda, J., Mirzoyan, R., Miyamoto, H., Moldon, J., Moralejo, A., Nieto, D., Nilsson, K., Orito, R., Oya, I., Paneque, D., Paoletti, R., Pardo, S., Paredes, J., Partini, S., Pasanen, M., Paüss, F., Pérez-Torres, M., Persic, M., Peruzzo, L., Pilia, M., Pochon, J., Prada, F., Prada Moroni, P., Prandini, E., Puljak, I., Reichardt, I., Reinthal, R., Rhode, W., Ribo, M., Rico, J., Rugamer, S., Saggion, A., Saito, K., Saito, T., Salvati, M., Satalecka, K., Scalzotto, V., Scapin, V., Schultz, C., Schweizer, T., Shayduk, M., Shore, S., Sillanpää, A., Sitarek, J., Sobczynska, D., Spanier, F., Spiro, S., Stamerra, A., Steinke, B., Storz, J., Strah, N., Suric, T., Takalo, L., Tavecchio, F., Temnikov, P., Terzic, T., Tescaro, D., Teshima, M., Thom, M., Tibolla, Omar, Torres, D., Treves, A., Vankov, H., Vogler, P., Wagner, R., Weitzel, Q., Zabalza, V., Zandanel, F., Zanin, R., Tanaka, Y., Wood, D., Buson, S.
Format:	Journal Article
Published:	Institute of Physics Publishing Ltd. 2011
Online Access:	http://iopscience.iop.org/2041-8205/730/1/L8/pdf/apjl_730_1_8.pdf http://hdl.handle.net/20.500.11937/9569

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author	Aleksic, J. Antonelli, L. Antoranz, P. Backes, M. Barrio, J. Bastieri, D. Becerra, J. Bednarek, W. Berduygin, A. Berger, K. Bernardini, E. Biland, A. Blanch, O. Bock, R. Boller, A. Bonnoli, G. Borla Tridon, D. Braun, I. Bretz, T. Cãellas, A. Carmona, E. Carosi, A. Colin, P. Colombo, E. Contreras, J. Cortina, J. Cossio, L. Covino, S. Dazzi, F. de Angelis, A. De Cea Del Pozo, E. De Lotto, B. Delgado, C. Diago Ortega, A. Doert, M. Dominguez, A. Dominis Prester, D. Dorner, D. Doro, M. Elsaesser, D. Ferenc, D. Fonseca, M. Font, L. Fruck, C. Garcia López, R. Garczarczyk, M. Garrido Terrats, D. Giavitto, G. Godinovic, N. Hadasch, D. Häfner, D. Herrero, A. Hildebrand, D. Höhne-Mönch, D. Hose, J. Hrupec, D. Huber, B. Jogler, T. Klepser, S. Krähenbühl, T. Krause, J. La Barbera, A. Lelas, D. Leonardo, E. Lindfors, E. Lombardi, S. López, M. Lorenz, E. Makariev, M. Maneva, G. Mankuzhiyil, N. Mannheim, K. Maraschi, L. Mariotti, M. Martínez, M. Mazin, D. Meucci, M. Miranda, J. Mirzoyan, R. Miyamoto, H. Moldon, J. Moralejo, A. Nieto, D. Nilsson, K. Orito, R. Oya, I. Paneque, D. Paoletti, R. Pardo, S. Paredes, J. Partini, S. Pasanen, M. Paüss, F. Pérez-Torres, M. Persic, M. Peruzzo, L. Pilia, M. Pochon, J. Prada, F. Prada Moroni, P. Prandini, E. Puljak, I. Reichardt, I. Reinthal, R. Rhode, W. Ribo, M. Rico, J. Rugamer, S. Saggion, A. Saito, K. Saito, T. Salvati, M. Satalecka, K. Scalzotto, V. Scapin, V. Schultz, C. Schweizer, T. Shayduk, M. Shore, S. Sillanpää, A. Sitarek, J. Sobczynska, D. Spanier, F. Spiro, S. Stamerra, A. Steinke, B. Storz, J. Strah, N. Suric, T. Takalo, L. Tavecchio, F. Temnikov, P. Terzic, T. Tescaro, D. Teshima, M. Thom, M. Tibolla, Omar Torres, D. Treves, A. Vankov, H. Vogler, P. Wagner, R. Weitzel, Q. Zabalza, V. Zandanel, F. Zanin, R. Tanaka, Y. Wood, D. Buson, S.
author_facet	Aleksic, J. Antonelli, L. Antoranz, P. Backes, M. Barrio, J. Bastieri, D. Becerra, J. Bednarek, W. Berduygin, A. Berger, K. Bernardini, E. Biland, A. Blanch, O. Bock, R. Boller, A. Bonnoli, G. Borla Tridon, D. Braun, I. Bretz, T. Cãellas, A. Carmona, E. Carosi, A. Colin, P. Colombo, E. Contreras, J. Cortina, J. Cossio, L. Covino, S. Dazzi, F. de Angelis, A. De Cea Del Pozo, E. De Lotto, B. Delgado, C. Diago Ortega, A. Doert, M. Dominguez, A. Dominis Prester, D. Dorner, D. Doro, M. Elsaesser, D. Ferenc, D. Fonseca, M. Font, L. Fruck, C. Garcia López, R. Garczarczyk, M. Garrido Terrats, D. Giavitto, G. Godinovic, N. Hadasch, D. Häfner, D. Herrero, A. Hildebrand, D. Höhne-Mönch, D. Hose, J. Hrupec, D. Huber, B. Jogler, T. Klepser, S. Krähenbühl, T. Krause, J. La Barbera, A. Lelas, D. Leonardo, E. Lindfors, E. Lombardi, S. López, M. Lorenz, E. Makariev, M. Maneva, G. Mankuzhiyil, N. Mannheim, K. Maraschi, L. Mariotti, M. Martínez, M. Mazin, D. Meucci, M. Miranda, J. Mirzoyan, R. Miyamoto, H. Moldon, J. Moralejo, A. Nieto, D. Nilsson, K. Orito, R. Oya, I. Paneque, D. Paoletti, R. Pardo, S. Paredes, J. Partini, S. Pasanen, M. Paüss, F. Pérez-Torres, M. Persic, M. Peruzzo, L. Pilia, M. Pochon, J. Prada, F. Prada Moroni, P. Prandini, E. Puljak, I. Reichardt, I. Reinthal, R. Rhode, W. Ribo, M. Rico, J. Rugamer, S. Saggion, A. Saito, K. Saito, T. Salvati, M. Satalecka, K. Scalzotto, V. Scapin, V. Schultz, C. Schweizer, T. Shayduk, M. Shore, S. Sillanpää, A. Sitarek, J. Sobczynska, D. Spanier, F. Spiro, S. Stamerra, A. Steinke, B. Storz, J. Strah, N. Suric, T. Takalo, L. Tavecchio, F. Temnikov, P. Terzic, T. Tescaro, D. Teshima, M. Thom, M. Tibolla, Omar Torres, D. Treves, A. Vankov, H. Vogler, P. Wagner, R. Weitzel, Q. Zabalza, V. Zandanel, F. Zanin, R. Tanaka, Y. Wood, D. Buson, S.
author_sort	Aleksic, J.
building	Curtin Institutional Repository
collection	Online Access
description	Very high energy (VHE) gamma-ray emission from the flat spectrum radio quasar (FSRQ) PKS 1222+21 (4C 21.35, z = 0.432) was detected with the MAGIC Cherenkov telescopes during a short observation (~0.5 hr) performed on 2010 June 17. The MAGIC detection coincides with high-energy MeV/GeV gamma-ray activity measured by the Large Area Telescope (LAT) on board the Fermi satellite. The VHE spectrum measured by MAGIC extends from about 70 GeV up to at least 400 GeV and can be well described by a power-law dN/dE vprop E -Gamma with a photon index Gamma = 3.75 ± 0.27stat ± 0.2syst. The averaged integral flux above 100 GeV is (4.6 ± 0.5) × 10-10 cm-2 s-1 (~1 Crab Nebula flux). The VHE flux measured by MAGIC varies significantly within the 30 minute exposure implying a flux doubling time of about 10 minutes. The VHE and MeV/GeV spectra, corrected for the absorption by the extragalactic background light (EBL), can be described by a single power law with photon index 2.72 ± 0.34 between 3 GeV and 400 GeV, and is consistent with emission belonging to a single component in the jet. The absence of a spectral cutoff constrains the gamma-ray emission region to lie outside the broad-line region, which would otherwise absorb the VHE gamma-rays. Together with the detected fast variability, this challenges present emission models from jets in FSRQs. Moreover, the combined Fermi/LAT and MAGIC spectral data yield constraints on the density of the EBL in the UV-optical to near-infrared range that are compatible with recent models.
first_indexed	2025-11-14T06:26:06Z
format	Journal Article
id	curtin-20.500.11937-9569
institution	Curtin University Malaysia
institution_category	Local University
last_indexed	2025-11-14T06:26:06Z
publishDate	2011
publisher	Institute of Physics Publishing Ltd.
recordtype	eprints
repository_type	Digital Repository
spelling	curtin-20.500.11937-95692017-02-28T01:32:40Z MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21 Aleksic, J. Antonelli, L. Antoranz, P. Backes, M. Barrio, J. Bastieri, D. Becerra, J. Bednarek, W. Berduygin, A. Berger, K. Bernardini, E. Biland, A. Blanch, O. Bock, R. Boller, A. Bonnoli, G. Borla Tridon, D. Braun, I. Bretz, T. Cãellas, A. Carmona, E. Carosi, A. Colin, P. Colombo, E. Contreras, J. Cortina, J. Cossio, L. Covino, S. Dazzi, F. de Angelis, A. De Cea Del Pozo, E. De Lotto, B. Delgado, C. Diago Ortega, A. Doert, M. Dominguez, A. Dominis Prester, D. Dorner, D. Doro, M. Elsaesser, D. Ferenc, D. Fonseca, M. Font, L. Fruck, C. Garcia López, R. Garczarczyk, M. Garrido Terrats, D. Giavitto, G. Godinovic, N. Hadasch, D. Häfner, D. Herrero, A. Hildebrand, D. Höhne-Mönch, D. Hose, J. Hrupec, D. Huber, B. Jogler, T. Klepser, S. Krähenbühl, T. Krause, J. La Barbera, A. Lelas, D. Leonardo, E. Lindfors, E. Lombardi, S. López, M. Lorenz, E. Makariev, M. Maneva, G. Mankuzhiyil, N. Mannheim, K. Maraschi, L. Mariotti, M. Martínez, M. Mazin, D. Meucci, M. Miranda, J. Mirzoyan, R. Miyamoto, H. Moldon, J. Moralejo, A. Nieto, D. Nilsson, K. Orito, R. Oya, I. Paneque, D. Paoletti, R. Pardo, S. Paredes, J. Partini, S. Pasanen, M. Paüss, F. Pérez-Torres, M. Persic, M. Peruzzo, L. Pilia, M. Pochon, J. Prada, F. Prada Moroni, P. Prandini, E. Puljak, I. Reichardt, I. Reinthal, R. Rhode, W. Ribo, M. Rico, J. Rugamer, S. Saggion, A. Saito, K. Saito, T. Salvati, M. Satalecka, K. Scalzotto, V. Scapin, V. Schultz, C. Schweizer, T. Shayduk, M. Shore, S. Sillanpää, A. Sitarek, J. Sobczynska, D. Spanier, F. Spiro, S. Stamerra, A. Steinke, B. Storz, J. Strah, N. Suric, T. Takalo, L. Tavecchio, F. Temnikov, P. Terzic, T. Tescaro, D. Teshima, M. Thom, M. Tibolla, Omar Torres, D. Treves, A. Vankov, H. Vogler, P. Wagner, R. Weitzel, Q. Zabalza, V. Zandanel, F. Zanin, R. Tanaka, Y. Wood, D. Buson, S. Very high energy (VHE) gamma-ray emission from the flat spectrum radio quasar (FSRQ) PKS 1222+21 (4C 21.35, z = 0.432) was detected with the MAGIC Cherenkov telescopes during a short observation (~0.5 hr) performed on 2010 June 17. The MAGIC detection coincides with high-energy MeV/GeV gamma-ray activity measured by the Large Area Telescope (LAT) on board the Fermi satellite. The VHE spectrum measured by MAGIC extends from about 70 GeV up to at least 400 GeV and can be well described by a power-law dN/dE vprop E -Gamma with a photon index Gamma = 3.75 ± 0.27stat ± 0.2syst. The averaged integral flux above 100 GeV is (4.6 ± 0.5) × 10-10 cm-2 s-1 (~1 Crab Nebula flux). The VHE flux measured by MAGIC varies significantly within the 30 minute exposure implying a flux doubling time of about 10 minutes. The VHE and MeV/GeV spectra, corrected for the absorption by the extragalactic background light (EBL), can be described by a single power law with photon index 2.72 ± 0.34 between 3 GeV and 400 GeV, and is consistent with emission belonging to a single component in the jet. The absence of a spectral cutoff constrains the gamma-ray emission region to lie outside the broad-line region, which would otherwise absorb the VHE gamma-rays. Together with the detected fast variability, this challenges present emission models from jets in FSRQs. Moreover, the combined Fermi/LAT and MAGIC spectral data yield constraints on the density of the EBL in the UV-optical to near-infrared range that are compatible with recent models. 2011 Journal Article http://hdl.handle.net/20.500.11937/9569 http://iopscience.iop.org/2041-8205/730/1/L8/pdf/apjl_730_1_8.pdf Institute of Physics Publishing Ltd. restricted
spellingShingle	Aleksic, J. Antonelli, L. Antoranz, P. Backes, M. Barrio, J. Bastieri, D. Becerra, J. Bednarek, W. Berduygin, A. Berger, K. Bernardini, E. Biland, A. Blanch, O. Bock, R. Boller, A. Bonnoli, G. Borla Tridon, D. Braun, I. Bretz, T. Cãellas, A. Carmona, E. Carosi, A. Colin, P. Colombo, E. Contreras, J. Cortina, J. Cossio, L. Covino, S. Dazzi, F. de Angelis, A. De Cea Del Pozo, E. De Lotto, B. Delgado, C. Diago Ortega, A. Doert, M. Dominguez, A. Dominis Prester, D. Dorner, D. Doro, M. Elsaesser, D. Ferenc, D. Fonseca, M. Font, L. Fruck, C. Garcia López, R. Garczarczyk, M. Garrido Terrats, D. Giavitto, G. Godinovic, N. Hadasch, D. Häfner, D. Herrero, A. Hildebrand, D. Höhne-Mönch, D. Hose, J. Hrupec, D. Huber, B. Jogler, T. Klepser, S. Krähenbühl, T. Krause, J. La Barbera, A. Lelas, D. Leonardo, E. Lindfors, E. Lombardi, S. López, M. Lorenz, E. Makariev, M. Maneva, G. Mankuzhiyil, N. Mannheim, K. Maraschi, L. Mariotti, M. Martínez, M. Mazin, D. Meucci, M. Miranda, J. Mirzoyan, R. Miyamoto, H. Moldon, J. Moralejo, A. Nieto, D. Nilsson, K. Orito, R. Oya, I. Paneque, D. Paoletti, R. Pardo, S. Paredes, J. Partini, S. Pasanen, M. Paüss, F. Pérez-Torres, M. Persic, M. Peruzzo, L. Pilia, M. Pochon, J. Prada, F. Prada Moroni, P. Prandini, E. Puljak, I. Reichardt, I. Reinthal, R. Rhode, W. Ribo, M. Rico, J. Rugamer, S. Saggion, A. Saito, K. Saito, T. Salvati, M. Satalecka, K. Scalzotto, V. Scapin, V. Schultz, C. Schweizer, T. Shayduk, M. Shore, S. Sillanpää, A. Sitarek, J. Sobczynska, D. Spanier, F. Spiro, S. Stamerra, A. Steinke, B. Storz, J. Strah, N. Suric, T. Takalo, L. Tavecchio, F. Temnikov, P. Terzic, T. Tescaro, D. Teshima, M. Thom, M. Tibolla, Omar Torres, D. Treves, A. Vankov, H. Vogler, P. Wagner, R. Weitzel, Q. Zabalza, V. Zandanel, F. Zanin, R. Tanaka, Y. Wood, D. Buson, S. MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21
title	MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21
title_full	MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21
title_fullStr	MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21
title_full_unstemmed	MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21
title_short	MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21
title_sort	magic discovery of very high energy emission from the fsrq pks 1222+21
url	http://iopscience.iop.org/2041-8205/730/1/L8/pdf/apjl_730_1_8.pdf http://hdl.handle.net/20.500.11937/9569

MAGIC Discovery of Very High Energy Emission from the FSRQ PKS 1222+21

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