Artículo
Chen, A.W.; Piano, G.; Tavani, M.; Trois, A.; Dubner, G.; Giacani, E.; Argan, A.; Barbiellini, G.; Bulgarelli, A.; Caraveo, P.; Cattaneo, P.W.; Costa, E.; D'Ammando, F.; De Paris, G.; DelMonte, E.; Di Cocco, G.; Donnarumma, I.; Evangelista, Y. (...) Salotti, L. "Study of the γ -ray source 1AGL J2022+4032 in the Cygnus region" (2011) Astronomy and Astrophysics. 525(13)
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Abstract:
Context. Identification of γ-ray-emitting Galactic sources is a long-standing problem in astrophysics. One such source, 1AGL J2022+4032, coincident with the interior of the radio shell of the supernova remnant Gamma Cygni (SNR G78.2+2.1) in the Cygnus region, has recently been identified by Fermi as a γ-ray pulsar, LAT PSR J2021+4026. Aims. We present long-term observations of 1AGL J2022+4032 with the AGILE γ-ray telescope, measuring its flux and light curve. Methods. We compare the light curve of 1AGL J2022+4032 with that of 1AGL J2021+3652 (PSR J2021+3651), showing that the flux variability of 1AGL J2022+4032 appears to be greater than the level predicted from statistical and systematic effects and producing detailed simulations to estimate the probability of the apparent observed variability. Results. We evaluate the possibility that the γ-ray emission may be due to the superposition of two or more point sources, some of which may be variable, considering a number of possible counterparts. Conclusions. We consider the possibility of a nearby X-ray quiet microquasar contributing to the flux of 1AGL J2022+4032 to be more likely than the hypotheses of a background blazar or intrinsic γ-ray variabilty of LAT PSR J2021+4026. © 2010 ESO.
Registro:
| Documento: | Artículo |
| Título: | Study of the γ -ray source 1AGL J2022+4032 in the Cygnus region |
| Autor: | Chen, A.W.; Piano, G.; Tavani, M.; Trois, A.; Dubner, G.; Giacani, E.; Argan, A.; Barbiellini, G.; Bulgarelli, A.; Caraveo, P.; Cattaneo, P.W.; Costa, E.; D'Ammando, F.; De Paris, G.; DelMonte, E.; Di Cocco, G.; Donnarumma, I.; Evangelista, Y.; Feroci, M.; Ferrari, A.; Fiorini, M.; Fuschino, F.; Galli, M.; Gianotti, F.; Giuliani, A.; Giusti, M.; Labanti, C.; Lazzarotto, F.; Lipari, P.; Longo, F.; Marisaldi, M.; Mereghetti, S.; Moretti, E.; Morselli, A.; Pacciani, L.; Pellizzoni, A.; Perotti, F.; Picozza, P.; Pilia, M.; Prest, M.; Pucella, G.; Rapisarda, M.; Rappoldi, A.; Sabatini, S.; Scalise, E.; Soffitta, P.; Striani, E.; Trifoglio, M.; Vallazza, E.; Vercellone, S.; Vittorini, V.; Zambra, A.; Zanello, D.; Pittori, C.; Giommi, P.; Verrecchia, F.; Lucarelli, F.; Santolamazza, P.; Colafrancesco, S.; Antonelli, L.A.; Salotti, L. |
| Filiación: | INAF, IASF-Roma, 00133 Roma, Italy Dip. di Fisica, Univ. Tor Vergata, 00133 Roma, Italy INAF, IASF-Milano, 20133 Milano, Italy CIFS-Torino, 10133 Torino, Italy INAF, IASF-Bologna, 40129 Bologna, Italy Dip. Fisica, INFN Trieste, 34127 Trieste, Italy INFN-Pavia, 27100 Pavia, Italy ENEA-Bologna, 40129 Bologna, Italy INFN-Roma la Sapienza, 00185 Roma, Italy CNR-IMIP, Roma, Italy INFN-Roma Tor Vergata, 00133 Roma, Italy Dip. di Fisica, Univ. dell'Insubria, 22100 Como, Italy ENEA Frascati, 00044 Frascati, Roma, Italy ASI Science Data Center, 00044 Frascati, Roma, Italy Agenzia Spaziale Italiana, 00198 Roma, Italy INAF-Osservatorio Astron. di Roma, Monte Porzio Catone, Italy INAF-IASF-Palermo, via U. La Malfa 15, 90146 Palermo, Italy Dip. Fisica, Universitá di Torino, Turin, Italy INAF-Osservatorio Astronomico di Cagliari, Localita' Poggio Dei Pini, strada 54, 09012 Capoterra, Italy Institute of Astronomy and Space Physics, University of Buenos Aires, Ciudad Universitariax, (1428), Ciudad de Buenos Aires, Argentina |
| Palabras clave: | gamma rays: stars; pulsars: individual: 1AGL J2022+4032; pulsars: individual: 1FGL J2021.5+4026; pulsars: individual: 3EG J2020+4017; pulsars: individual: LAT PSR J2021+4026; Flux variability; Gamma rays: stars; Light curves; Point sources; Pulsars: individuals; Standing problems; Supernova remnants; Systematic effects; Astrophysics; Stars; Gamma rays |
| Año: | 2011 |
| Volumen: | 525 |
| Número: | 13 |
| DOI: | http://dx.doi.org/10.1051/0004-6361/201015279 |
| Título revista: | Astronomy and Astrophysics |
| Título revista abreviado: | Astron. Astrophys. |
| ISSN: | 00046361 |
| CODEN: | AAEJA |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v525_n13_p_Chen |
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Citas:
---------- APA ----------
Chen, A.W., Piano, G., Tavani, M., Trois, A., Dubner, G., Giacani, E., Argan, A.,..., Salotti, L. (2011) . Study of the γ -ray source 1AGL J2022+4032 in the Cygnus region. Astronomy and Astrophysics, 525(13).http://dx.doi.org/10.1051/0004-6361/201015279
---------- CHICAGO ----------
Chen, A.W., Piano, G., Tavani, M., Trois, A., Dubner, G., Giacani, E., et al. "Study of the γ -ray source 1AGL J2022+4032 in the Cygnus region" . Astronomy and Astrophysics 525, no. 13 (2011).http://dx.doi.org/10.1051/0004-6361/201015279
---------- MLA ----------
Chen, A.W., Piano, G., Tavani, M., Trois, A., Dubner, G., Giacani, E., et al. "Study of the γ -ray source 1AGL J2022+4032 in the Cygnus region" . Astronomy and Astrophysics, vol. 525, no. 13, 2011.http://dx.doi.org/10.1051/0004-6361/201015279
---------- VANCOUVER ----------
Chen, A.W., Piano, G., Tavani, M., Trois, A., Dubner, G., Giacani, E., et al. Study of the γ -ray source 1AGL J2022+4032 in the Cygnus region. Astron. Astrophys. 2011;525(13).http://dx.doi.org/10.1051/0004-6361/201015279
