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429 results on '"Barrio, J. A."'

1. Performance and first measurements of the MAGIC Stellar Intensity Interferometer

Author

MAGIC Collaboration, Abe, S., Abhir, J., Acciari, V. A., Aguasca-Cabot, A., Agudo, I., Aniello, T., Ansoldi, S., Antonelli, L. A., Engels, A. Arbet, Arcaro, C., Artero, M., Asano, K., Babić, A., Baquero, A., de Almeida, U. Barres, Barrio, J. A., Batković, I., Bautista, A., Baxter, J., González, J. Becerra, Bernardini, E., Bernardos, M., Bernete, J., Berti, A., Besenrieder, J., Bigongiari, C., Biland, A., Blanch, O., Bošnjak, Ž., Burelli, I., Busetto, G., Campoy-Ordaz, A., Carosi, A., Carosi, R., Carretero-Castrillo, M., Ceribella, G., Chai, Y., Cifuentes, A., Colombo, E., Contreras, J. L., Cortina, J., Covino, S., D'Amico, G., D'Elia, V., Da Vela, P., Dazzi, F., De Angelis, A., De Lotto, B., de Menezes, R., Del Popolo, A., Delfino, M., Delgado, J., Mendez, C. Delgado, Di Pierro, F., Di Venere, L., Prester, D. Dominis, Donini, A., Dorner, D., Doro, M., Elsaesser, D., Emery, G., Escudero, J., na, L. Fari, Fattorini, A., Foffano, L., Font, L., Fröse, S., Fukami, S., Fukazawa, Y., López, R. J. García, Garczarczyk, M., Gasparyan, S., Gaug, M., Paiva, J. G. Giesbrecht, Giglietto, N., Giordano, F., Gliwny, P., Gradetzke, T., Grau, R., Green, D., Green, J. G., Günther, P., Hadasch, D., Hahn, A., Hassan, T., Heckmann, L., Herrera, J., Hrupec, D., Hütten, M., Imazawa, R., Ishio, K., Martínez, I. Jiménez, Jormanainen, J., Kayanoki, T., Kerszberg, D., Kluge, G. W., Kobayashi, Y., Kouch, P. M., Kubo, H., Kushida, J., Láinez, M., Lamastra, A., Leone, F., Lindfors, E., Linhoff, L., Lombardi, S., Longo, F., López-Coto, R., López-Moya, M., López-Oramas, A., Loporchio, S., Lorini, A., Lyard, E., Fraga, B. Machado de Oliveira, Majumdar, P., Makariev, M., Maneva, G., Mang, N., Manganaro, M., Mangano, S., Mannheim, K., Mariotti, M., Martínez, M., Martínez-Chicharro, M., Mas-Aguilar, A., Mazin, D., Menchiari, S., Mender, S., Miceli, D., Miener, T., Miranda, J. M., Mirzoyan, R., González, M. Molero, Molina, E., Mondal, H. A., Moralejo, A., Morcuende, D., Nakamori, T., Nanci, C., Neustroev, V., Nickel, L., Rosillo, M. Nievas, Nigro, C., Nikolić, L., Nilsson, K., Nishijima, K., Ekoume, T. Njoh, Noda, K., Nozaki, S., Ohtani, Y., Okumura, A., Otero-Santos, J., Paiano, S., Palatiello, M., Paneque, D., Paoletti, R., Paredes, J. M., Peresano, M., Persic, M., Pihet, M., Pirola, G., Podobnik, F., Moroni, P. G. Prada, Prandini, E., Principe, G., Priyadarshi, C., Rhode, W., Ribó, M., Rico, J., Righi, C., Sahakyan, N., Saito, T., Satalecka, K., Saturni, F. G., Schleicher, B., Schmidt, K., Schmuckermaier, F., Schubert, J. L., Schweizer, T., Sciaccaluga, A., Silvestri, G., Sitarek, J., Sliusar, V., Sobczynska, D., Spolon, A., Stamerra, A., Strišković, J., Strom, D., Strzys, M., Suda, Y., Surić, T., Suutarinen, S., Tajima, H., Takahashi, M., Takeishi, R., Temnikov, P., Terauchi, K., Terzić, T., Truzzi, M. Teshima S., Tutone, A., Ubach, S., van Scherpenberg, J., Acosta, M. Vazquez, Ventura, S., Viale, I., Vigorito, C. F., Vitale, V., Walter, R., Will, M., Wunderlich, C., Yamamoto, T., Díaz, G. Chon C., Fiori, M., Lobo, M., Naletto, G., Polo, M., Rodríguez-Vázquez, J. J., Saha, P., and Zampieri, L.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Solar and Stellar Astrophysics
Abstract

In recent years, a new generation of optical intensity interferometers has emerged, leveraging the existing infrastructure of Imaging Atmospheric Cherenkov Telescopes (IACTs). The MAGIC telescopes host the MAGIC-SII system (Stellar Intensity Interferometer), implemented to investigate the feasibility and potential of this technique on IACTs. After the first successful measurements in 2019, the system was upgraded and now features a real-time, dead-time-free, 4-channel, GPU-based correlator. These hardware modifications allow seamless transitions between MAGIC's standard very-high-energy gamma-ray observations and optical interferometry measurements within seconds. We establish the feasibility and potential of employing IACTs as competitive optical Intensity Interferometers with minimal hardware adjustments. The measurement of a total of 22 stellar diameters are reported, 9 corresponding to reference stars with previous comparable measurements, and 13 with no prior measurements. A prospective implementation involving telescopes from the forthcoming Cherenkov Telescope Array Observatory's northern hemisphere array, such as the first prototype of its Large-Sized Telescopes, LST-1, is technically viable. This integration would significantly enhance the sensitivity of the current system and broaden the UV-plane coverage. This advancement would enable the system to achieve competitive sensitivity with the current generation of long-baseline optical interferometers over blue wavelengths., Comment: 18 pages, 13 figures, submitted to MNRAS

Published
2024
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2. Constraints on axion-like particles with the Perseus Galaxy Cluster with MAGIC

Author

MAGIC Collaboration, Abe, H., Abe, S., Abhir, J., Acciari, V. A., Agudo, I., Aniello, T., Ansoldi, S., Antonelli, L. A., Engels, A. Arbet, Arcaro, C., Artero, M., Asano, K., Baack, D., Babić, A., Baquero, A., de Almeida, U. Barres, Barrio, J. A., Batković, I., Baxter, J., González, J. Becerra, Bednarek, W., Bernardini, E., Bernete, J., Berti, A., Besenrieder, J., Bigongiari, C., Biland, A., Blanch, O., Bonnoli, G., Bošnjak, Ž., Burelli, I., Busetto, G., Campoy-Ordaz, A., Carosi, A., Carosi, R., Carretero-Castrillo, M., Castro-Tirado, A. J., Ceribella, G., Chai, Y., Cifuentes, A., Cikota, S., Colombo, E., Contreras, J. L., Cortina, J., Covino, S., D'Amico, G., D'Elia, V., Da Vela, P., Dazzi, F., De Angelis, A., De Lotto, B., Del Popolo, A., Delgado, J., Mendez, C. Delgado, Depaoli, D., Di Pierro, F., Di Venere, L., Donini, A., Dorner, D., Doro, M., Elsaesser, D., Emery, G., Escudero, J., Fariña, L., Fattorini, A., Foffano, L., Font, L., Fukami, S., Fukazawa, Y., López, R. J. García, Garczarczyk, M., Gasparyan, S., Gaug, M., Paiva, J. G. Giesbrecht, Giglietto, N., Giordano, F., Gliwny, P., Godinović, N., Grau, R., Green, D., Green, J. G., Hadasch, D., Hahn, A., Hassan, T., Heckmann, L., Herrera, J., Hrupec, D., Hütten, M., Imazawa, R., Inada, T., Iotov, R., Ishio, K., Martínez, I. Jiménez, Jormanainen, J., Kerszberg, D., Kluge, G. W., Kobayashi, Y., Kouch, P. M., Kubo, H., Kushida, J., Láinez, M., Lamastra, A., Leone, F., Lindfors, E., Linhoff, L., Lombardi, S., Longo, F., López-Coto, R., López-Moya, M., López-Oramas, A., Loporchio, S., Lorini, A., Fraga, B. Machado de Oliveira, Majumdar, P., Makariev, M., Maneva, G., Mang, N., Manganaro, M., Mangano, S., Mannheim, K., Mariotti, M., Martínez, M., Martínez-Chicharro, M., Mas-Aguilar, A., Mazin, D., Menchiari, S., Mender, S., Miceli, D., Miener, T., Miranda, J. M., Mirzoyan, R., González, M. Molero, Molina, E., Mondal, H. A., Moralejo, A., Morcuende, D., Nakamori, T., Nanci, C., Nava, L., Neustroev, V., Nickel, L., Rosillo, M. Nievas, Nigro, C., Nikolić, L., Nilsson, K., Nishijima, K., Ekoume, T. Njoh, Noda, K., Nozaki, S., Ohtani, Y., Okumura, A., Otero-Santos, J., Paiano, S., Palatiello, M., Paneque, D., Paoletti, R., Paredes, J. M., Pavlović, D., Persic, M., Pihet, M., Pirola, G., Podobnik, F., Moroni, P. G. Prada, Prandini, E., Principe, G., Priyadarshi, C., Rhode, W., Ribó, M., Rico, J., Righi, C., Sahakyan, N., Saito, T., Satalecka, K., Saturni, F. G., Schleicher, B., Schmidt, K., Schmuckermaier, F., Schubert, J. L., Schweizer, T., Sciaccaluga, A., Sitarek, J., Sliusar, V., Sobczynska, D., Spolon, A., Stamerra, A., Strišković, J., Strom, D., Strzys, M., Suda, Y., Suutarinen, S., Tajima, H., Takahashi, M., Takeishi, R., Tavecchio, F., Temnikov, P., Terauchi, K., Terzić, T., Teshima, M., Tosti, L., Truzzi, S., Tutone, A., Ubach, S., van Scherpenberg, J., Acosta, M. Vazquez, Ventura, S., Verguilov, V., Viale, I., Vigorito, C. F., Vitale, V., Vovk, I., Walter, R., Will, M., and Yamamoto, T.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology
Abstract

Axion-like particles (ALPs) are pseudo-Nambu-Goldstone bosons that emerge in various theories beyond the standard model. These particles can interact with high-energy photons in external magnetic fields, influencing the observed gamma-ray spectrum. This study analyzes 41.3 hrs of observational data from the Perseus Galaxy Cluster collected with the MAGIC telescopes. We focused on the spectra the radio galaxy in the center of the cluster: NGC 1275. By modeling the magnetic field surrounding this target, we searched for spectral indications of ALP presence. Despite finding no statistical evidence of ALP signatures, we were able to exclude ALP models in the sub-micro electronvolt range. Our analysis improved upon previous work by calculating the full likelihood and statistical coverage for all considered models across the parameter space. Consequently, we achieved the most stringent limits to date for ALP masses around 50 neV, with cross sections down to $g_{a\gamma} = 3 \times 10^{-12}$ GeV$^{-1}$., Comment: 25 pages, 10 figures, accepted for publication in Physics of the Dark Universe

Published
2024
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3. MAGIC detection of GRB 201216C at $z=1.1$

Author

Abe, H., Abe, S., Acciari, V. A., Agudo, I., Aniello, T., Ansoldi, S., Antonelli, L. A., Engels, A. Arbet, Arcaro, C., Artero, M., Asano, K., Baack, D., Babić, A., Baquero, A., de Almeida, U. Barres, Barrio, J. A., Batković, I., Baxter, J., González, J. Becerra, Bednarek, W., Bernardini, E., Bernete, J., Berti, A., Besenrieder, J., Bigongiari, C., Biland, A., Blanch, O., Bonnoli, G., Bošnjak, Ž., Burelli, I., Busetto, G., Campoy-Ordaz, A., Carosi, A., Carosi, R., Carretero-Castrillo, M., Castro-Tirado, A. J., Ceribella, G., Chai, Y., Cifuentes, A., Cikota, S., Colombo, E., Contreras, J. L., Cortina, J., Covino, S., D'Amico, G., D'Elia, V., Da Vela, P., Dazzi, F., De Angelis, A., De Lotto, B., Del Popolo, A., Delfino, M., Delgado, J., Mendez, C. Delgado, Depaoli, D., Di Pierro, F., Di Venere, L., Prester, D. Dominis, Donini, A., Dorner, D., Doro, M., Elsaesser, D., Emery, G., Escudero, J., Fariña, L., Fattorini, A., Foffano, L., Font, L., Fukami, S., Fukazawa, Y., López, R. J. García, Garczarczyk, M., Gasparyan, S., Gaug, M., Paiva, J. G. Giesbrecht, Giglietto, N., Giordano, F., Gliwny, P., Godinović, N., Grau, R., Green, D., Green, J. G., Hadasch, D., Hahn, A., Hassan, T., Heckmann, L., Herrera, J., Hrupec, D., Hütten, M., Imazawa, R., Inada, T., Iotov, R., Ishio, K., Martínez, I. Jiménez, Jormanainen, J., Kerszberg, D., Kluge, G. W., Kobayashi, Y., Kouch, P. M., Kubo, H., Kushida, J., Lezáun, M. Láinez, Lamastra, A., Leone, F., Lindfors, E., Linhoff, L., Lombardi, S., Longo, F., López-Coto, R., López-Moya, M., López-Oramas, A., Loporchio, S., Lorini, A., Lyard, E., Fraga, B. Machado de Oliveira, Majumdar, P., Makariev, M., Maneva, G., Mang, N., Manganaro, M., Mangano, S., Mannheim, K., Mariotti, M., Martínez, M., Mas-Aguilar, A., Mazin, D., Menchiari, S., Mender, S., Mićanović, S., Miceli, D., Miener, T., Miranda, J. M., Mirzoyan, R., González, M. Molero, Molina, E., Mondal, H. A., Moralejo, A., Morcuende, D., Nanci, C., Nava, L., Neustroev, V., Rosillo, M. Nievas, Nigro, C., Nikolić, L., Nilsson, K., Nishijima, K., Ekoume, T. Njoh, Noda, K., Nozaki, S., Ohtani, Y., Okumura, A., Otero-Santos, J., Paiano, S., Palatiello, M., Paneque, D., Paoletti, R., Paredes, J. M., Pavletić, L., Pavlović, D., Persic, M., Pihet, M., Pirola, G., Podobnik, F., Moroni, P. G. Prada, Prandini, E., Principe, G., Priyadarshi, C., Rhode, W., Ribó, M., Rico, J., Righi, C., Sahakyan, N., Saito, T., Satalecka, K., Saturni, F. G., Schleicher, B., Schmidt, K., Schmuckermaier, F., Schubert, J. L., Schweizer, T., Sciaccaluga, A., Sitarek, J., Sliusar, V., Sobczynska, D., Spolon, A., Stamerra, A., Strišković, J., Strom, D., Strzys, M., Suda, Y., Suutarinen, S., Tajima, H., Takahashi, M., Takeishi, R., Tavecchio, F., Temnikov, P., Terauchi, K., Terzić, T., Teshima, M., Tosti, L., Truzzi, S., Tutone, A., Ubach, S., van Scherpenberg, J., Acosta, M. Vazquez, Ventura, S., Verguilov, V., Viale, I., Vigorito, C. F., Vitale, V., Vovk, I., Walter, R., Will, M., Yamamoto, T., Gomboc, A., Jordana-Mitjans, N., Melandri, A., Mundell, C. G., Shrestha, M., and Steele, I. A.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Gamma-ray bursts (GRBs) are explosive transient events occurring at cosmological distances, releasing a large amount of energy as electromagnetic radiation over several energy bands. We report the detection of the long GRB~201216C by the MAGIC telescopes. The source is located at $z=1.1$ and thus it is the farthest one detected at very high energies. The emission above \SI{70}{\GeV} of GRB~201216C is modelled together with multi-wavelength data within a synchrotron and synchrotron-self Compton (SSC) scenario. We find that SSC can explain the broadband data well from the optical to the very-high-energy band. For the late-time radio data, a different component is needed to account for the observed emission. Differently from previous GRBs detected in the very-high-energy range, the model for GRB~201216C strongly favors a wind-like medium. The model parameters have values similar to those found in past studies of the afterglows of GRBs detected up to GeV energies., Comment: 13 pages, 6 figures, 2 tables. Accepted for publication in Monthly Notices of the Royal Astronomical Society

Published
2023
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6. Proton acceleration in thermonuclear nova explosions revealed by gamma rays

Author

Acciari, V. A., Ansoldi, S., Antonelli, L. A., Arbet Engels, A., Artero, M., Asano, K., Baack, D., Babić, A., Baquero, A., Barres de Almeida, U., Barrio, J. A., Batković, I., Becerra González, J., Bednarek, W., Bellizzi, L., Bernardini, E., Bernardos, M., Berti, A., Besenrieder, J., Bhattacharyya, W., Bigongiari, C., Biland, A., Blanch, O., Bökenkamp, H., Bonnoli, G., Bošnjak, Ž., Busetto, G., Carosi, R., Ceribella, G., Cerruti, M., Chai, Y., Chilingarian, A., Cikota, S., Colak, S. M., Colombo, E., Contreras, J. L., Cortina, J., Covino, S., D’Amico, G., D’Elia, V., Da Vela, P., Dazzi, F., De Angelis, A., De Lotto, B., Del Popolo, A., Delfino, M., Delgado, J., Delgado Mendez, C., Depaoli, D., Di Pierro, F., Di Venere, L., Do Souto Espiñeira, E., Prester, D. Dominis, Donini, A., Dorner, D., Doro, M., Elsaesser, D., Fallah Ramazani, V., Fariña Alonso, L., Fattorini, A., Fonseca, M. V., Font, L., Fruck, C., Fukami, S., Fukazawa, Y., García López, R. J., Garczarczyk, M., Gasparyan, S., Gaug, M., Giglietto, N., Giordano, F., Gliwny, P., Godinović, N., Green, J. G., Green, D., Hadasch, D., Hahn, A., Hassan, T., Heckmann, L., Herrera, J., Hoang, J., Hrupec, D., Hütten, M., Inada, T., Ishio, K., Iwamura, Y., Jiménez Martínez, I., Jormanainen, J., Jouvin, L., Kerszberg, D., Kobayashi, Y., Kubo, H., Kushida, J., Lamastra, A., Lelas, D., Leone, F., Lindfors, E., Linhoff, L., Lombardi, S., Longo, F., López-Coto, R., López-Moya, M., López-Oramas, A., Loporchio, S., Machado de Oliveira Fraga, B., Maggio, C., Majumdar, P., Makariev, M., Mallamaci, M., Maneva, G., Manganaro, M., Mannheim, K., Maraschi, L., Mariotti, M., Martínez, M., Mas Aguilar, A., Mazin, D., Menchiari, S., Mender, S., Mićanović, S., Miceli, D., Miener, T., Miranda, J. M., Mirzoyan, R., Molina, E., Moralejo, A., Morcuende, D., Moreno, V., Moretti, E., Nakamori, T., Nava, L., Neustroev, V., Nievas Rosillo, M., Nigro, C., Nilsson, K., Nishijima, K., Noda, K., Nozaki, S., Ohtani, Y., Oka, T., Otero-Santos, J., Paiano, S., Palatiello, M., Paneque, D., Paoletti, R., Paredes, J. M., Pavletić, L., Peñil, P., Persic, M., Pihet, M., Prada Moroni, P. G., Prandini, E., Priyadarshi, C., Puljak, I., Rhode, W., Ribó, M., Rico, J., Righi, C., Rugliancich, A., Sahakyan, N., Saito, T., Sakurai, S., Satalecka, K., Saturni, F. G., Schleicher, B., Schmidt, K., Schweizer, T., Sitarek, J., Šnidarić, I., Sobczynska, D., Spolon, A., Stamerra, A., Strišković, J., Strom, D., Strzys, M., Suda, Y., Surić, T., Takahashi, M., Takeishi, R., Tavecchio, F., Temnikov, P., Terzić, T., Teshima, M., Tosti, L., Truzzi, S., Tutone, A., Ubach, S., van Scherpenberg, J., Vanzo, G., Vazquez Acosta, M., Ventura, S., Verguilov, V., Vigorito, C. F., Vitale, V., Vovk, I., Will, M., Wunderlich, C., Yamamoto, T., Zarić, D., Ambrosino, F., Cecconi, M., Catanzaro, G., Ferrara, C., Frasca, A., Munari, M., Giustolisi, L., Alonso-Santiago, J., Giarrusso, M., Munari, U., and Valisa, P.

Published
2022
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7. Black hole lightning due to particle acceleration at subhorizon scales

Author

MAGIC Collaboration, Aleksić, J., Ansoldi, S., Antonelli, L. A., Antoranz, P., Babic, A., Bangale, P., Barrio, J. A., González, J. Becerra, Bednarek, W., Bernardini, E., Biasuzzi, B., Biland, A., Blanch, O., Bonnefoy, S., Bonnoli, G., Borracci, F., Bretz, T., Carmona, E., Carosi, A., Colin, P., Colombo, E., Contreras, J. L., Cortina, J., Covino, S., Da Vela, P., Dazzi, F., De Angelis, A., De Caneva, G., De Lotto, B., Wilhelmi, E. de Oña, Mendez, C. Delgado, Prester, D. Dominis, Dorner, D., Doro, M., Einecke, S., Eisenacher, D., Elsaesser, D., Fonseca, M. V., Font, L., Frantzen, K., Fruck, C., Galindo, D., López, R. J. García, Garczarczyk, M., Terrats, D. Garrido, Gaug, M., Godinović, N., Muñoz, A. González, Gozzini, S. R., Hadasch, D., Hanabata, Y., Hayashida, M., Herrera, J., Hildebrand, D., Hose, J., Hrupec, D., Idec, W., Kadenius, V., Kellermann, H., Kodani, K., Konno, Y., Krause, J., Kubo, H., Kushida, J., La Barbera, A., Lelas, D., Lewandowska, N., Lindfors, E., Lombardi, S., Longo, F., López, M., López-Coto, R., López-Oramas, A., Lorenz, E., Lozano, I., Makariev, M., Mallot, K., Maneva, G., Mankuzhiyil, N., Mannheim, K., Maraschi, L., Marcote, B., Mariotti, M., Martínez, M., Mazin, D., Menzel, U., Miranda, J. M., Mirzoyan, R., Moralejo, A., Munar-Adrover, P., Nakajima, D., Niedzwiecki, A., Nilsson, K., Nishijima, K., Noda, K., Orito, R., Overkemping, A., Paiano, S., Palatiello, M., Paneque, D., Paoletti, R., Paredes, J. M., Paredes-Fortuny, X., Persic, M., Poutanen, J., Moroni, P. G. Prada, Prandini, E., Puljak, I., Reinthal, R., Rhode, W., Ribó, M., Rico, J., Garcia, J. Rodriguez, Rügamer, S., Saito, T., Saito, K., Satalecka, K., Scalzotto, V., Scapin, V., Schultz, C., Schweizer, T., Shore, S. N., Sillanpää, A., Sitarek, J., Snidaric, I., Sobczynska, D., Spanier, F., Stamatescu, V., Stamerra, A., Steinbring, T., Storz, J., Strzys, M., Takalo, L., Takami, H., Tavecchio, F., Temnikov, P., Terzić, T., Tescaro, D., Teshima, M., Thaele, J., Tibolla, O., Torres, D. F., Toyama, T., Treves, A., Uellenbeck, M., Vogler, P., Zanin, R., Kadler, M., Schulz, R., Ros, E., Bach, U., Krauß, F., and Wilms, J.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Supermassive black holes with masses of millions to billions of solar masses are commonly found in the centers of galaxies. Astronomers seek to image jet formation using radio interferometry, but still suffer from insufficient angular resolution. An alternative method to resolve small structures is to measure the time variability of their emission. Here, we report on gamma-ray observations of the radio galaxy IC 310 obtained with the MAGIC telescopes revealing variability with doubling time scales faster than 4.8 min. Causality constrains the size of the emission region to be smaller than 20\% of the gravitational radius of its central black hole. We suggest that the emission is associated with pulsar-like particle acceleration by the electric field across a magnetospheric gap at the base of the radio jet., Comment: 19 pages, 10 figures, includes Supplementary Materials

Published
2014
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8. Insights into the broadband emission of the TeV blazar Mrk 501 during the first X-ray polarization measurements.

Author

MAGIC Collaboration, Abe, S., Abhir, J., Acciari, V. A., Aguasca-Cabot, A., Agudo, I., Aniello, T., Ansoldi, S., Antonelli, L. A., Arbet Engels, A., Arcaro, C., Asano, K., Babić, A., Baquero, A., Barres de Almeida, U., Barrio, J. A., Batković, I., Bautista, A., Baxter, J., and Becerra González, J.

Subjects
X-rays, CRAB Nebula, ELECTRON distribution, BREWSTER'S angle, GAMMA ray bursts, OPTICAL polarization, BL Lacertae objects, LINEAR polarization, SYNCHROTRONS
Abstract

Aims. We present the first multiwavelength study of Mrk 501 that contains simultaneous very-high-energy (VHE) γ-ray observations and X-ray polarization measurements from the Imaging X-ray Polarimetry Explorer (IXPE). Methods. We used radio-to-VHE data from a multiwavelength campaign carried out between March 1, 2022, and July 19, 2022 (MJD 59639 to MJD 59779). The observations were performed by MAGIC, Fermi-LAT, NuSTAR, Swift (XRT and UVOT), and several other instruments that cover the optical and radio bands to complement the IXPE pointings. We characterized the dynamics of the broadband emission around the X-ray polarization measurements through its multiband fractional variability and correlations, and compared changes observed in the polarization degree to changes seen in the broadband emission using a multi-zone leptonic scenario. Results. During the IXPE pointings, the VHE state is close to the average behavior, with a 0.2–1 TeV flux of 20%–50% of the emission of the Crab Nebula. Additionally, it shows low variability and a hint of correlation between VHE γ-rays and X-rays. Despite the average VHE activity, an extreme X-ray behavior is measured for the first two IXPE pointings, taken in March 2022 (MJD 59646 to 59648 and MJD 59665 to 59667), with a synchrotron peak frequency > 1 keV. For the third IXPE pointing, in July 2022 (MJD 59769 to 59772), the synchrotron peak shifts toward lower energies and the optical/X-ray polarization degrees drop. All three IXPE epochs show an atypically low Compton dominance in the γ-rays. The X-ray polarization is systematically higher than at lower energies, suggesting an energy stratification of the jet. While during the IXPE epochs the polarization angles in the X-ray, optical, and radio bands align well, we find a clear discrepancy in the optical and radio polarization angles in the middle of the campaign. Such results further support the hypothesis of an energy-stratified jet. We modeled broadband spectra taken simultaneous to the IXPE pointings, assuming a compact zone that dominates in the X-rays and the VHE band, and an extended zone stretching farther downstream in the jet that dominates the emission at lower energies. NuSTAR data allow us to precisely constrain the synchrotron peak and therefore the underlying electron distribution. The change between the different states observed in the three IXPE pointings can be explained by a change in the magnetization and/or the emission region size, which directly connects the shift in the synchrotron peak to lower energies with the drop in the polarization degree. [ABSTRACT FROM AUTHOR]

Published
2024
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14. Performance and first measurements of the MAGIC stellar intensity interferometer.

Author

Abe, S, Abhir, J, Acciari, V A, Aguasca-Cabot, A, Agudo, I, Aniello, T, Ansoldi, S, Antonelli, L A, Arbet Engels, A, Arcaro, C, Artero, M, Asano, K, Babić, A, Baquero, A, de Almeida, U Barres, Barrio, J A, Batković, I, Bautista, A, Baxter, J, and González, J Becerra

Subjects
OPTICAL measurements, MAGIC, OPTICAL interferometers, TELESCOPES, CORRELATORS, MEASUREMENT
Abstract

In recent years, a new generation of optical intensity interferometers has emerged, leveraging the existing infrastructure of Imaging Atmospheric Cherenkov Telescopes (IACTs). The MAGIC telescopes host the MAGIC-SII system (Stellar Intensity Interferometer), implemented to investigate the feasibility and potential of this technique on IACTs. After the first successful measurements in 2019, the system was upgraded and now features a real-time, dead-time-free, 4-channel, GPU-based correlator. These hardware modifications allow seamless transitions between MAGIC's standard very-high-energy gamma-ray observations and optical interferometry measurements within seconds. We establish the feasibility and potential of employing IACTs as competitive optical Intensity Interferometers with minimal hardware adjustments. The measurement of a total of 22 stellar diameters are reported, 9 corresponding to reference stars with previous comparable measurements, and 13 with no prior measurements. A prospective implementation involving telescopes from the forthcoming Cherenkov Telescope Array Observatory's Northern hemisphere array, such as the first prototype of its Large-Sized Telescopes, LST-1, is technically viable. This integration would significantly enhance the sensitivity of the current system and broaden the UV-plane coverage. This advancement would enable the system to achieve competitive sensitivity with the current generation of long-baseline optical interferometers over blue wavelengths. [ABSTRACT FROM AUTHOR]

Published
2024
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16. MAGIC detection of GRB 201216C at z = 1.1.

Author

Abe, H, Abe, S, Acciari, V A, Agudo, I, Aniello, T, Ansoldi, S, Antonelli, L A, Engels, A Arbet, Arcaro, C, Artero, M, Asano, K, Baack, D, Babić, A, Baquero, A, de Almeida, U Barres, Barrio, J A, Batković, I, Baxter, J, González, J Becerra, and Bednarek, W

Subjects
ELECTROMAGNETIC radiation, ELECTROMAGNETIC waves, GAMMA ray bursts, COSMOLOGICAL distances, ENERGY bands, MAGIC
Abstract

Gamma-ray bursts (GRBs) are explosive transient events occurring at cosmological distances, releasing a large amount of energy as electromagnetic radiation over several energy bands. We report the detection of the long GRB 201216C by the MAGIC telescopes. The source is located at z  = 1.1 and thus it is the farthest one detected at very high energies. The emission above 70 GeV of GRB 201216C is modelled together with multiwavelength data within a synchrotron and synchrotron self-Compton (SSC) scenario. We find that SSC can explain the broad-band data well from the optical to the very-high-energy band. For the late-time radio data, a different component is needed to account for the observed emission. Differently from previous GRBs detected in the very-high-energy range, the model for GRB 201216C strongly favours a wind-like medium. The model parameters have values similar to those found in past studies of the afterglows of GRBs detected up to GeV energies. [ABSTRACT FROM AUTHOR]

Published
2024
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20. Black hole lightning due to particle acceleration at subhorizon scales

Author

Aleksić, J., Ansoldi, S., Antonelli, L. A., Antoranz, P., Babic, A., Bangale, P., Barrio, J. A., González, J. Becerra, Bednarek, W., Bernardini, E., Biasuzzi, B., Biland, A., Blanch, O., Bonnefoy, S., Bonnoli, G., Borracci, F., Bretz, T., Carmona, E., Carosi, A., Colin, P., Colombo, E., Contreras, J. L., Cortina, J., Covino, S., Da Vela, P., Dazzi, F., De Angelis, A., De Caneva, G., De Lotto, B., de Oña Wilhelmi, E., Mendez, C. Delgado, Prester, D. Dominis, Dorner, D., Doro, M., Einecke, S., Eisenacher, D., Elsaesser, D., Fonseca, M. V., Font, L., Frantzen, K., Fruck, C., Galindo, D., López, R. J. García, Garczarczyk, M., Terrats, D. Garrido, Gaug, M., Godinović, N., Muñoz, A. González, Gozzini, S. R., Hadasch, D., Hanabata, Y., Hayashida, M., Herrera, J., Hildebrand, D., Hose, J., Hrupec, D., Idec, W., Kadenius, V., Kellermann, H., Kodani, K., Konno, Y., Krause, J., Kubo, H., Kushida, J., La Barbera, A., Lelas, D., Lewandowska, N., Lindfors, E., Lombardi, S., Longo, F., López, M., López-Coto, R., López-Oramas, A., Lorenz, E., Lozano, I., Makariev, M., Mallot, K., Maneva, G., Mankuzhiyil, N., Mannheim, K., Maraschi, L., Marcote, B., Mariotti, M., Martínez, M., Mazin, D., Menzel, U., Miranda, J. M., Mirzoyan, R., Moralejo, A., Munar-Adrover, P., Nakajima, D., Niedzwiecki, A., Nilsson, K., Nishijima, K., Noda, K., Orito, R., Overkemping, A., Paiano, S., Palatiello, M., Paneque, D., Paoletti, R., Paredes, J. M., Paredes-Fortuny, X., Persic, M., Poutanen, J., Moroni, P. G. Prada, Prandini, E., Puljak, I., Reinthal, R., Rhode, W., Ribó, M., Rico, J., Garcia, J. Rodriguez, Rügamer, S., Saito, T., Saito, K., Satalecka, K., Scalzotto, V., Scapin, V., Schultz, C., Schweizer, T., Shore, S. N., Sillanpää, A., Sitarek, J., Snidaric, I., Sobczynska, D., Spanier, F., Stamatescu, V., Stamerra, A., Steinbring, T., Storz, J., Strzys, M., Takalo, L., Takami, H., Tavecchio, F., Temnikov, P., Terzić, T., Tescaro, D., Teshima, M., Thaele, J., Tibolla, O., Torres, D. F., Toyama, T., Treves, A., Uellenbeck, M., Vogler, P., Zanin, R., Kadler, M., Schulz, R., Ros, E., Bach, U., Krauß, F., and Wilms, J.

Published
2014

21. Variable Very-High-Energy Gamma-Ray Emission from the Microquasar LS I +61 303

Author

Albert, J., Aliu, E., Anderhub, H., Antoranz, P., Armada, A., Asensio, M., Baixeras, C., Barrio, J. A., Bartelt, M., Bartko, H., Bastieri, D., Bavikadi, S. R., Bednarek, W., Berger, K., Bigongiari, C., Biland, A., Bisesi, E., Bock, R. K., Bordas, P., Bosch-Ramon, V., Bretz, T., Britvitch, I., Camara, M., Carmona, E., Chilingarian, A., Ciprini, S., Coarasa, J. A., Commkhau, S., Contreras, J. L., Cortina, J., Curtef, V., Danielyan, V., Dazzi, F., De Angelis, A., de los Reyes, R., De Lotto, B., Domingo-Santamaria, E., Dorner, D., Doro, M., Errando, M., Fagiolini, M., Ferenc, D., Fernandez, E., Firpo, R., Flix, J., Fonseca, M. V., Font, L., Fuchs, M., Galante, N., Garczarczyk, M., Gaug, M., Giller, M., Goebel, F., Hakobyan, D., Hayashida, M., Hengstebeck, T., Höhne, D., Hose, J., Hsu, C. C., Isar, P. G., Jacon, P., Kalekin, O., Kosyra, R., Kranich, D., Laatiaoui, M., Laille, A., Lenisa, T., Liebing, P., Lindfors, E., Lombardi, S., Longo, F., Lopez, J., López, M., Lorenz, E., Lucarelli, F., Majumdar, P., Maneva, G., Mannheim, K., Mansutti, O., Mariotti, M., Martínez, M., Mase, K., Mazin, D., Merck, C., Meucci, M., Meyer, M., Miranda, J. M., Mirzoyan, R., Mizobuchi, S., Moralejo, A., Nilsson, K., Oña-Wilhelmi, E., Orduña, R., Otte, N., Oya, I., Paneque, D., Paoletti, R., Paredes, J. M., Pasanen, M., Pascoli, D., Pauss, F., Pavel, N., Pegna, R., Persic, M., Peruzzo, L., Piccioli, A., Poller, M., Pooley, G., Prandini, E., Raymers, A., Rhode, W., Ribó, M., Rico, J., Riegel, B., Rissi, M., Robert, A., Romero, G. E., Rügamer, S., Saggion, A., Sánchez, A., Sartori, P., Scalzotto, V., Scapin, V., Schmitt, R., Schweizer, T., Shayduk, M., Shinozaki, K., Shore, S. N., Sidro, N., Sillanpää, A., Sobczynska, D., Stamerra, A., Stark, L. S., Takalo, L., Temnikov, P., Tescaro, D., Teshima, M., Tonello, N., Torres, A., Torres, D. F., Turini, N., Vankov, H., Vitale, V., Wagner, R. M., Wibig, T., Wittek, W., Zanin, R., and Zapatero, J.

Published
2006

25. MAGIC observations provide compelling evidence of hadronic multi-TeV emission from the putative PeVatron SNR G106.3+2.7.

Author

MAGIC Collaboration, Abe, H., Abe, S., Acciari, V. A., Agudo, I., Aniello, T., Ansoldi, S., Antonelli, L. A., Arbet Engels, A., Arcaro, C., Artero, M., Asano, K., Baack, D., Babić, A., Baquero, A., Barres de Almeida, U., Barrio, J. A., Batković, I., Baxter, J., and Becerra González, J.

Subjects
PARTICLE emissions, THRESHOLD energy, HADRONIC atoms, SUPERNOVA remnants, MAGIC, PARTICLE acceleration, COSMIC ray showers, COSMIC rays
Abstract

Context. Certain types of supernova remnants (SNRs) in our Galaxy are assumed to be PeVatrons, capable of accelerating cosmic rays (CRs) to ~ PeV energies. However, conclusive observational evidence for this has not yet been found. The SNR G106.3+2.7, detected at 1–100 TeV energies by different γ-ray facilities, is one of the most promising PeVatron candidates. This SNR has a cometary shape, which can be divided into a head and a tail region with different physical conditions. However, in which region the 100 TeV emission is produced has not yet been identified because of the limited position accuracy and/or angular resolution of existing observational data. Additionally, it remains unclear as to whether the origin of the γ-ray emission is leptonic or hadronic. Aims. With the better angular resolution provided by new MAGIC data compared to earlier γ-ray datasets, we aim to reveal the acceleration site of PeV particles and the emission mechanism by resolving the SNR G106.3+2.7 with 0.1° resolution at TeV energies. Methods. We observed the SNR G106.3+2.7 using the MAGIC telescopes for 121.7 h in total – after quality cuts – between May 2017 and August 2019. The analysis energy threshold is ~0.2 TeV, and the angular resolution is 0.07−0.1°. We examined the γ-ray spectra of different parts of the emission, whilst benefitting from the unprecedented statistics and angular resolution at these energies provided by our new data. We also used measurements at other wavelengths such as radio, X-rays, GeV γ-rays, and 10 TeV γ-rays to model the emission mechanism precisely. Results. We detect extended γ-ray emission spatially coincident with the radio continuum emission at the head and tail of SNR G106.3+2.7. The fact that we detect a significant γ-ray emission with energies above 6.0 TeV from only the tail region suggests that the emissions above 10 TeV detected with air shower experiments (Milagro, HAWC, Tibet ASγ and LHAASO) are emitted only from the SNR tail. Under this assumption, the multi-wavelength spectrum of the head region can be explained with either hadronic or leptonic models, while the leptonic model for the tail region is in contradiction with the emission above 10 TeV and X-rays. In contrast, the hadronic model could reproduce the observed spectrum at the tail by assuming a proton spectrum with a cutoff energy of ~1 PeV for that region. Such high-energy emission in this middle-aged SNR (4−10 kyr) can be explained by considering a scenario where protons escaping from the SNR in the past interact with surrounding dense gases at present. Conclusions. The γ-ray emission region detected with the MAGIC telescopes in the SNR G106.3+2.7 is extended and spatially coincident with the radio continuum morphology. The multi-wavelength spectrum of the emission from the tail region suggests proton acceleration up to ~PeV, while the emission mechanism of the head region could either be hadronic or leptonic. [ABSTRACT FROM AUTHOR]

Published
2023
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28. Third-Line Rescue Therapy with Bismuth-Containing Quadruple Regimen After Failure of Two Treatments (with Clarithromycin and Levofloxacin) for H. pylori Infection

Author

Gisbert, J. P., Perez-Aisa, A., Rodrigo, L., Molina-Infante, J., Modolell, I., Bermejo, F., Castro-Fernández, M., Antón, R., Sacristán, B., Cosme, A., Barrio, J., Harb, Y., Gonzalez-Barcenas, M., Fernandez-Bermejo, M., Algaba, A., Marín, A. C., McNicholl, A. G., and On behalf of the H. pylori Study Group of the Spanish Gastroenterology Association

Published
2014
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29. Gamma-ray observations of MAXI J1820+070 during the 2018 outburst.

Author

Abe, H, Abe, S, Acciari, V A, Aniello, T, Ansoldi, S, Antonelli, L A, Arbet Engels, A, Arcaro, C, Artero, M, Asano, K, Baack, D, Babić, A, Baquero, A, Barres de Almeida, U, Barrio, J A, Batković, I, Baxter, J, Becerra González, J, Bednarek, W, and Bernardini, E

Subjects
X-ray binaries, SOLAR radio emission, BINARY black holes, MAGNETIC fields
Abstract

MAXI J1820+070 is a low-mass X-ray binary with a black hole (BH) as a compact object. This binary underwent an exceptionally bright X-ray outburst from 2018 March to October, showing evidence of a non-thermal particle population through its radio emission during this whole period. The combined results of 59.5 h of observations of the MAXI J1820+070 outburst with the H.E.S.S. MAGIC and VERITAS experiments at energies above 200 GeV are presented, together with Fermi -LAT data between 0.1 and 500 GeV, and multiwavelength observations from radio to X-rays. Gamma-ray emission is not detected from MAXI J1820+070, but the obtained upper limits and the multiwavelength data allow us to put meaningful constraints on the source properties under reasonable assumptions regarding the non-thermal particle population and the jet synchrotron spectrum. In particular, it is possible to show that, if a high-energy (HE) gamma-ray emitting region is present during the hard state of the source, its predicted flux should be at most a factor of 20 below the obtained Fermi -LAT upper limits, and closer to them for magnetic fields significantly below equipartition. During the state transitions, under the plausible assumption that electrons are accelerated up to ∼500 GeV, the multiwavelength data and the gamma-ray upper limits lead consistently to the conclusion that a potential HE and very-HE gamma-ray emitting region should be located at a distance from the BH ranging between 1011 and 1013 cm. Similar outbursts from low-mass X-ray binaries might be detectable in the near future with upcoming instruments such as CTA. [ABSTRACT FROM AUTHOR]

Published
2022
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33. Helicobacter pylori second-line rescue therapy with levofloxacin- and bismuth-containing quadruple therapy, after failure of standard triple or non-bismuth quadruple treatments

Author

Gisbert, J. P., Romano, M., Gravina, A. G., Solís-Muñoz, P., Bermejo, F., Molina-Infante, J., Castro-Fernández, M., Ortuño, J., Lucendo, A. J., Herranz, M., Modolell, I., del Castillo, F., Gómez, J., Barrio, J., Velayos, B., Gómez, B., Domínguez, J. L., Miranda, A., Martorano, M., Algaba, A., Pabón, M., Angueira, T., Fernández-Salazar, L., Federico, A., Marín, A. C., and McNicholl, A. G.

Published
2015
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34. Optimised empiric triple and concomitant therapy for Helicobacter pylori eradication in clinical practice: the OPTRICON study

Author

Molina-Infante, J., Lucendo, A. J., Angueira, T., Rodriguez-Tellez, M., Perez-Aisa, A., Balboa, A., Barrio, J., Martin-Noguerol, E., Gomez-Rodriguez, B. J., Botargues-Bote, J. M., Gomez-Camarero, J., Huerta, A., Modolell, I., Ariño, I., Herranz-Bachiller, M. T., Bermejo, F., McNicholl, A. G., OʼMorain, C., Gisbert, J. P., Lima, A., Tejero-Bustos, M. A., Sans, M., Mearin, F., Perez-Lasala, J., Mañas-Gallardo, N., Millastre, J., Gracia, M., Rodriguez-Sanchez, J., Rancel-Medina, F. J., Lanas, A., and Prados, S.

Published
2015
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36. BLACK HOLE PHYSICS: Black hole lightning due to particle acceleration at subhorizon scales

Author

Aleksić, J., Ansoldi, S., Antonelli, L. A., Antoranz, P., Babic, A., Bangale, P., Barrio, J. A., González, Becerra J., Bednarek, W., Bernardini, E., Biasuzzi, B., Biland, A., Blanch, O., Bonnefoy, S., Bonnoli, G., Borracci, F., Bretz, T., Carmona, E., Carosi, A., Colin, P., Colombo, E., Contreras, J. L., Cortina, J., Covino, S., Da Vela, P., Dazzi, F., De Angelis, A., De Caneva, G., De Lotto, B., de Oña Wilhelmi, E., Mendez, Delgado C., Prester, Dominis D., Dorner, D., Doro, M., Einecke, S., Eisenacher, D., Elsaesser, D., Fonseca, M. V., Font, L., Frantzen, K., Fruck, C., Galindo, D., López, García R. J., Garczarczyk, M., Terrats, Garrido D., Gaug, M., Godinović, N., Muñoz, González A., Gozzini, S. R., Hadasch, D., Hanabata, Y., Hayashida, M., Herrera, J., Hildebrand, D., Hose, J., Hrupec, D., Idec, W., Kadenius, V., Kellermann, H., Kodani, K., Konno, Y., Krause, J., Kubo, H., Kushida, J., La Barbera, A., Lelas, D., Lewandowska, N., Lindfors, E., Lombardi, S., Longo, F., López, M., López-Coto, R., López-Oramas, A., Lorenz, E., Lozano, I., Makariev, M., Mallot, K., Maneva, G., Mankuzhiyil, N., Mannheim, K., Maraschi, L., Marcote, B., Mariotti, M., Martínez, M., Mazin, D., Menzel, U., Miranda, J. M., Mirzoyan, R., Moralejo, A., Munar-Adrover, P., Nakajima, D., Niedzwiecki, A., Nilsson, K., Nishijima, K., Noda, K., Orito, R., Overkemping, A., Paiano, S., Palatiello, M., Paneque, D., Paoletti, R., Paredes, J. M., Paredes-Fortuny, X., Persic, M., Poutanen, J., Moroni, Prada P. G., Prandini, E., Puljak, I., Reinthal, R., Rhode, W., Ribó, M., Rico, J., Garcia, Rodriguez J., Rügamer, S., Saito, T., Saito, K., Satalecka, K., Scalzotto, V., Scapin, V., Schultz, C., Schweizer, T., Shore, S. N., Sillanpää, A., Sitarek, J., Snidaric, I., Sobczynska, D., Spanier, F., Stamatescu, V., Stamerra, A., Steinbring, T., Storz, J., Strzys, M., Takalo, L., Takami, H., Tavecchio, F., Temnikov, P., Terzić, T., Tescaro, D., Teshima, M., Thaele, J., Tibolla, O., Torres, D. F., Toyama, T., Treves, A., Uellenbeck, M., Vogler, P., Zanin, R., Kadler, M., Schulz, R., Ros, E., Bach, U., Krau, F., and Wilms, J.

Published
2014
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37. Design concepts for the Cherenkov Telescope Array CTA: an advanced facility for ground-based high-energy gamma-ray astronomy

Author

Actis, M., Agnetta, G., Aharonian, F., Akhperjanian, A., Aleksić, J., Aliu, E., Allan, D., Allekotte, I., Antico, F., Antonelli, L. A., Antoranz, P., Aravantinos, A., Arlen, T., Arnaldi, H., Artmann, S., Asano, K., Asorey, H., Bähr, J., Bais, A., Baixeras, C., Bajtlik, S., Balis, D., Bamba, A., Barbier, C., Barceló, M., Barnacka, A., Barnstedt, J., Barres de Almeida, U., Barrio, J. A., Basso, S., Bastieri, D., Bauer, C., Becerra, J., Becherini, Y., Bechtol, K., Becker, J., Beckmann, V., Bednarek, W., Behera, B., Beilicke, M., Belluso, M., Benallou, M., Benbow, W., Berdugo, J., Berger, K., Bernardino, T., Bernlöhr, K., Biland, A., Billotta, S., Bird, T., Birsin, E., Bissaldi, E., Blake, S., Blanch, O., Bobkov, A. A., Bogacz, L., Bogdan, M., Boisson, C., Boix, J., Bolmont, J., Bonanno, G., Bonardi, A., Bonev, T., Borkowski, J., Botner, O., Bottani, A., Bourgeat, M., Boutonnet, C., Bouvier, A., Brau-Nogué, S., Braun, I., Bretz, T., Briggs, M. S., Brun, P., Brunetti, L., Buckley, J. H., Bugaev, V., Bühler, R., Bulik, T., Busetto, G., Buson, S., Byrum, K., Cailles, M., Cameron, R., Canestrari, R., Cantu, S., Carmona, E., Carosi, A., Carr, J., Carton, P. H., Casiraghi, M., Castarede, H., Catalano, O., Cavazzani, S., Cazaux, S., Cerruti, B., Cerruti, M., Chadwick, P. M., Chiang, J., Chikawa, M., Cieślar, M., Ciesielska, M., Cillis, A., Clerc, C., Colin, P., Colomé, J., Compin, M., Conconi, P., Connaughton, V., Conrad, J., Contreras, J. L., Coppi, P., Corlier, M., Corona, P., Corpace, O., Corti, D., Cortina, J., Costantini, H., Cotter, G., Courty, B., Couturier, S., Covino, S., Croston, J., Cusumano, G., Daniel, M. K., Dazzi, F., Angelis, A. de, de Cea del Pozo, E., de Gouveia Dal Pino, E. M., de Jager, O., de la Calle Pérez, I., De La Vega, G., De Lotto, B., de Naurois, M., de Oña Wilhelmi, E., de Souza, V., Decerprit, B., Deil, C., Delagnes, E., Deleglise, G., Delgado, C., Dettlaff, T., Di Paolo, A., Di Pierro, F., Díaz, C., Dick, J., Dickinson, H., Digel, S. W., Dimitrov, D., Disset, G., Djannati-Ataï, A., Doert, M., Domainko, W., Dorner, D., Doro, M., Dournaux, J.-L., Dravins, D., Drury, L., Dubois, F., Dubois, R., Dubus, G., Dufour, C., Durand, D., Dyks, J., Dyrda, M., Edy, E., Egberts, K., Eleftheriadis, C., Elles, S., Emmanoulopoulos, D., Enomoto, R., Ernenwein, J.-P., Errando, M., Etchegoyen, A., Falcone, A. D., Farakos, K., Farnier, C., Federici, S., Feinstein, F., Ferenc, D., Fillin-Martino, E., Fink, D., Finley, C., Finley, J. P., Firpo, R., Florin, D., Föhr, C., Fokitis, E., Font, Ll., Fontaine, G., Fontana, A., Förster, A., Fortson, L., Fouque, N., Fransson, C., Fraser, G. W., Fresnillo, L., Fruck, C., Fujita, Y., Fukazawa, Y., Funk, S., Gäbele, W., Gabici, S., Gadola, A., Galante, N., Gallant, Y., García, B., García López, R. J., Garrido, D., Garrido, L., Gascón, D., Gasq, C., Gaug, M., Gaweda, J., Geffroy, N., Ghag, C., Ghedina, A., Ghigo, M., Gianakaki, E., Giarrusso, S., Giavitto, G., Giebels, B., Giro, E., Giubilato, P., Glanzman, T., Glicenstein, J.-F., Gochna, M., Golev, V., Gómez Berisso, M., González, A., González, F., Grañena, F., Graciani, R., Granot, J., Gredig, R., Green, A., Greenshaw, T., Grimm, O., Grube, J., Grudzińska, M., Grygorczuk, J., Guarino, V., Guglielmi, L., Guilloux, F., Gunji, S., Gyuk, G., Hadasch, D., Haefner, D., Hagiwara, R., Hahn, J., Hallgren, A., Hara, S., Hardcastle, M. J., Hassan, T., Haubold, T., Hauser, M., Hayashida, M., Heller, R., Henri, G., Hermann, G., Herrero, A., Hinton, J. A., Hoffmann, D., Hofmann, W., Hofverberg, P., Horns, D., Hrupec, D., Huan, H., Huber, B., Huet, J.-M., Hughes, G., Hultquist, K., Humensky, T. B., Huppert, J.-F., Ibarra, A., Illa, J. M., Ingjald, J., Inoue, Y., Inoue, S., Ioka, K., Jablonski, C., Jacholkowska, A., Janiak, M., Jean, P., Jensen, H., Jogler, T., Jung, I., Kaaret, P., Kabuki, S., Kakuwa, J., Kalkuhl, C., Kankanyan, R., Kapala, M., Karastergiou, A., Karczewski, M., Karkar, S., Karlsson, N., Kasperek, J., Katagiri, H., Katarzyński, K., Kawanaka, N., Kȩdziora, B., Kendziorra, E., Khélifi, B., Kieda, D., Kifune, T., Kihm, T., Klepser, S., Kluźniak, W., Knapp, J., Knappy, A. R., Kneiske, T., Knödlseder, J., Köck, F., Kodani, K., Kohri, K., Kokkotas, K., Komin, N., Konopelko, A., Kosack, K., Kossakowski, R., Kostka, P., Kotuła, J., Kowal, G., Kozioł, J., Krähenbühl, T., Krause, J., Krawczynski, H., Krennrich, F., Kretzschmann, A., Kubo, H., Kudryavtsev, V. A., Kushida, J., La Barbera, N., La Parola, V., La Rosa, G., López, A., Lamanna, G., Laporte, P., Lavalley, C., Le Flour, T., Le Padellec, A., Lenain, J.-P., Lessio, L., Lieunard, B., Lindfors, E., Liolios, A., Lohse, T., Lombardi, S., Lopatin, A., Lorenz, E., Lubiński, P., Luz, O., Lyard, E., Maccarone, M. C., Maccarone, T., Maier, G., Majumdar, P., Maltezos, S., Małkiewicz, P., Mañá, C., Manalaysay, A., Maneva, G., Mangano, A., Manigot, P., Marín, J., Mariotti, M., Markoff, S., Martínez, G., Martínez, M., Mastichiadis, A., Matsumoto, H., Mattiazzo, S., Mazin, D., McComb, T. J. L., McCubbin, N., McHardy, I., Medina, C., Melkumyan, D., Mendes, A., Mertsch, P., Meucci, M., Michałowski, J., Micolon, P., Mineo, T., Mirabal, N., Mirabel, F., Miranda, J. M., Mirzoyan, R., Mizuno, T., Moal, B., Moderski, R., Molinari, E., Monteiro, I., Moralejo, A., Morello, C., Mori, K., Motta, G., Mottez, F., Moulin, E., Mukherjee, R., Munar, P., Muraishi, H., Murase, K., Murphy, A. StJ., Nagataki, S., Naito, T., Nakamori, T., Nakayama, K., Naumann, C., Naumann, D., Nayman, P., Nedbal, D., Niedźwiecki, A., Niemiec, J., Nikolaidis, A., Nishijima, K., Nolan, S. J., Nowak, N., O’Brien, P. T., Ochoa, I., Ohira, Y., Ohishi, M., Ohka, H., Okumura, A., Olivetto, C., Ong, R. A., Orito, R., Orr, M., Osborne, J. P., Ostrowski, M., Otero, L., Otte, A. N., Ovcharov, E., Oya, I., Oziȩbło, A., Paiano, S., Pallota, J., Panazol, J. L., Paneque, D., Panter, M., Paoletti, R., Papyan, G., Paredes, J. M., Pareschi, G., Parsons, R. D., Paz Arribas, M., Pedaletti, G., Pepato, A., Persic, M., Petrucci, P. O., Peyaud, B., Piechocki, W., Pita, S., Pivato, G., Płatos, Ł., Platzer, R., Pogosyan, L., Pohl, M., Pojmański, G., Ponz, J. D., Potter, W., Prandini, E., Preece, R., Prokoph, H., Pühlhofer, G., Punch, M., Quel, E., Quirrenbach, A., Rajda, P., Rando, R., Rataj, M., Raue, M., Reimann, C., Reimann, O., Reimer, A., Reimer, O., Renaud, M., Renner, S., Reymond, J.-M., Rhode, W., Ribó, M., Ribordy, M., Rico, J., Rieger, F., Ringegni, P., Ripken, J., Ristori, P., Rivoire, S., Rob, L., Rodriguez, S., Roeser, U., Romano, P., Romero, G. E., Rosier-Lees, S., Rovero, A. C., Roy, F., Royer, S., Rudak, B., Rulten, C. B., Ruppel, J., Russo, F., Ryde, F., Sacco, B., Saggion, A., Sahakian, V., Saito, K., Saito, T., Sakaki, N., Salazar, E., Salini, A., Sánchez, F., Sánchez Conde, M. Á., Santangelo, A., Santos, E. M., Sanuy, A., Sapozhnikov, L., Sarkar, S., Scalzotto, V., Scapin, V., Scarcioffolo, M., Schanz, T., Schlenstedt, S., Schlickeiser, R., Schmidt, T., Schmoll, J., Schroedter, M., Schultz, C., Schultze, J., Schulz, A., Schwanke, U., Schwarzburg, S., Schweizer, T., Seiradakis, J., Selmane, S., Seweryn, K., Shayduk, M., Shellard, R. C., Shibata, T., Sikora, M., Silk, J., Sillanpää, A., Sitarek, J., Skole, C., Smith, N., Sobczyńska, D., Sofo Haro, M., Sol, H., Spanier, F., Spiga, D., Spyrou, S., Stamatescu, V., Stamerra, A., Starling, R. L. C., Stawarz, Ł., Steenkamp, R., Stegmann, C., Steiner, S., Stergioulas, N., Sternberger, R., Stinzing, F., Stodulski, M., Straumann, U., Suárez, A., Suchenek, M., Sugawara, R., Sulanke, K. H., Sun, S., Supanitsky, A. D., Sutcliffe, P., Szanecki, M., Szepieniec, T., Szostek, A., Szymkowiak, A., Tagliaferri, G., Tajima, H., Takahashi, H., Takahashi, K., Takalo, L., Takami, H., Talbot, R. G., Tam, P. H., Tanaka, M., Tanimori, T., Tavani, M., Tavernet, J.-P., Tchernin, C., Tejedor, L. A., Telezhinsky, I., Temnikov, P., Tenzer, C., Terada, Y., Terrier, R., Teshima, M., Testa, V., Tibaldo, L., Tibolla, O., Tluczykont, M., Todero Peixoto, C. J., Tokanai, F., Tokarz, M., Toma, K., Torres, D. F., Tosti, G., Totani, T., Toussenel, F., Vallania, P., Vallejo, G., van der Walt, J., van Eldik, C., Vandenbroucke, J., Vankov, H., Vasileiadis, G., Vassiliev, V. V., Vegas, I., Venter, L., Vercellone, S., Veyssiere, C., Vialle, J. P., Videla, M., Vincent, P., Vink, J., Vlahakis, N., Vlahos, L., Vogler, P., Vollhardt, A., Volpe, F., von Gunten, H. P., Vorobiov, S., Wagner, S., Wagner, R. M., Wagner, B., Wakely, S. P., Walter, P., Walter, R., Warwick, R., Wawer, P., Wawrzaszek, R., Webb, N., Wegner, P., Weinstein, A., Weitzel, Q., Welsing, R., Wetteskind, H., White, R., Wierzcholska, A., Wilkinson, M. I., Williams, D. A., Winde, M., Wischnewski, R., Wiśniewski, Ł., Wolczko, A., Wood, M., Xiong, Q., Yamamoto, T., Yamaoka, K., Yamazaki, R., Yanagita, S., Yoffo, B., Yonetani, M., Yoshida, A., Yoshida, T., Yoshikoshi, T., Zabalza, V., Zagdański, A., Zajczyk, A., Zdziarski, A., Zech, A., Ziȩtara, K., Ziółkowski, P., Zitelli, V., Zychowski, P., and The CTA Consortium

Published
2011
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40. Liver dysfunction related to hepatitis B and C in patients with inflammatory bowel disease treated with immunosuppressive therapy

Author

Loras, C., Gisbert, J.P., Minguez, M., Merino, O., Bujanda, L., Saro, C., Domenech, E., Barrio, J., Andreu, M., Ordas, I., Vida, L., Bastida, G., Gonzalez-Huix, F., Piqueras, M., Ginard, D., Calvet, X., Gutierrez, A., Abad, A., Torres, M., Panes, J., Chaparro, M., Pascual, I., Rodriguez-Carballeira, M., Fernandez-Banares, F., Viver, J.M., and Esteve, M.

Subjects
Liver diseases -- Risk factors, Inflammatory bowel diseases -- Care and treatment, Inflammatory bowel diseases -- Patient outcomes, Immunosuppressive agents -- Usage, Immunosuppressive agents -- Health aspects, Hepatitis B -- Risk factors, Health
Published
2010

41. Long-term follow-up of the PROTDILAT study; LONG-PROTDILAT Prospective multicenter randomized comparative study of endoscopic treatment of strictures in Crohn's disease (CD): self-expandable metal stent (SEMS) vs endoscopic balloon dilatation (EBD).

Author

Ruiz- Ramírez, P., Loras, C., Gornals, J. B., Bosca-Watts, M. Maia, Brunet, E., Iglesias, E., Barrio, J., Sicilia, B., Dueñas, C., Foruny-Olcina, J. R., Martín-Arranz, M. J., Busquets, D., Cerrillo, E., García-Morales, N., Monfort, D., Pérez-Roldán, F., Pijoan, E., Gonzalez, B., Reyes, J., and Torres, G.

Subjects
CROHN'S disease, COMPARATIVE studies
Abstract

This article provides a long-term follow-up of the PROTDILAT study, which compared the efficacy of endoscopic balloon dilatation (EBD) and self-expandable metal stent (SEMS) for the treatment of strictures in Crohn's disease (CD). The study found that EBD was more effective than SEMS in the short term, but the long-term effectiveness was similar between the two treatments. The majority of patients treated with EBD were able to avoid surgery and required fewer endoscopic treatments in the long term. Factors associated with a higher risk of surgery included non-intensification of therapy, treatment with SEMS, and a greater number of stents. Complications were more common in surgical treatment compared to endoscopic treatment. [Extracted from the article]

Published
2024
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50. Dietary patterns among children aged 6-7y in four Spanish cities with widely differing cardiovascular mortality

Author

Rodriguez-Artalejo, F., Garces, C., Gorgojo, L., Garcia, E. Lopez, Martin-Moreno, J. M., Benavente, M., del Barrio, J. L., Rubio, R., Ortega, H., Fernandez, O., and de Oya, M.

Abstract

Objective: Classic cardiovascular risk factors, such as smoking, arterial hypertension and hypercholesterolaemia, cannot explain a substantial part of the geographic differences in cardiovascular mortality. Anthropometric and nutritional factors in early stages of life may contribute to adult cardiovascular disease. Therefore, this work examines certain anthropometric variables and diet among children aged 6-7y, living in four Spanish cities with widely differing ischaemic heart disease (IHD) mortality. Design and setting: Cross-sectional anthropometric and dietary survey in four cities in Spain. Subjects: A total of 1112 children (50.1% males, 49.9% females) attending public and private schools in Cadiz and Murcia, cities with a relatively high IHD mortality, and Madrid and Orense, cities with a relatively low IHD mortality. A standardized method was used to measure anthropometric variables, and a food-frequency questionnaire completed by subjects' mothers, to measure diet. Outcome measures: Body mass index (BMI), overweight (BMI > 17.6 kg/[m.sup.2]), obesity (BMI > 20.1 kg/[m.sup.2]) and intake of food and nutrients. Results: Children in the four cities showed a high prevalence of overweight (range across cities, 28.9-34.5%) and obesity (8.515.7%). They also had a moderately hypercaloric diet (range, 2078-2218 kcal/day), marked by an excessive intake of lipids (45.0-47.3% kcal), particularly saturated fats (16.6-16.9% kcal), proteins (17.0-17.3% kcal), sugars (20.0-21.9% kcal) and cholesterol (161.6-182.9 mg/1000 kcal/day), and a low intake of complex carbohydrates (117.5- 18.1% kcal) and fibre (19.619.9g/day). Compared with children in the two low-IHD-mortality cities, those in the two high-IHD-mortality cities had a greater BMI (mean difference, 0.61 kg/[m.sup.2]; P = 0.0001) and ponderal index (0.58 kg/[m.sup.3]; P = 0.0001) and a higher intake of energy (104 kcal/day; P = 0.007), cholesterol (16.00 mg/1000 kcal/day; P = 0.0001) and sodium (321 mg/day; P = 0.0001). Inter-city differences in anthropometric variables remained after adjustment for birthweight. Conclusions: Intake of fats, especially saturated fats, and cholesterol should be reduced among Spanish children. It could contribute to a needed reduction of the high prevalence of overweight and obesity in children. If the differences in anthropometric variables and diet between children from the cities with high and low coronary mortality are maintained in future or continue into adulthood, this could contribute to consolidate or even increase the IHD mortality gradient across cities. The finding that differences in anthropometric variables are independent of birthweight suggests that the childhood, rather than intrauterine environment, is involved in the development of such differences. Sponsorship: This study was partly funded by grants from the International Olive Oil Board (Consejo Oleicola Internacional), Comunidad Autonoma de Madrid, Fundacion Pedro Barrio de la Maza, and Fundacion Eugenio Rodriguez Pascual. DOI: 10.1038/sj/ejcn/1601296 Keywords: diet; obesity; cardiovascular disease; children, Introduction Classic cardiovascular risk factors, such as smoking, arterial hypertension and hypercholesterolaemia, cannot explain a substantial part of the geographic differences in cardiovascular mortality, within countries (Rodriguez Artalejo et al, [...]

Published
2002

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