Study of the γ -ray source 1AGL J2022+4032 in the Cygnus region

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...

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Autores principales: 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.
Formato: JOUR
Materias:
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
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00046361_v525_n13_p_Chen
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00046361_v525_n13_p_Chen
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spelling todo:paper_00046361_v525_n13_p_Chen2023-10-03T14:00:33Z Study of the γ -ray source 1AGL J2022+4032 in the Cygnus region 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. 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 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00046361_v525_n13_p_Chen
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 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
spellingShingle 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
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.
Study of the γ -ray source 1AGL J2022+4032 in the Cygnus region
topic_facet 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
description 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.
format JOUR
author 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.
author_facet 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.
author_sort Chen, A.W.
title Study of the γ -ray source 1AGL J2022+4032 in the Cygnus region
title_short Study of the γ -ray source 1AGL J2022+4032 in the Cygnus region
title_full Study of the γ -ray source 1AGL J2022+4032 in the Cygnus region
title_fullStr Study of the γ -ray source 1AGL J2022+4032 in the Cygnus region
title_full_unstemmed Study of the γ -ray source 1AGL J2022+4032 in the Cygnus region
title_sort study of the γ -ray source 1agl j2022+4032 in the cygnus region
url http://hdl.handle.net/20.500.12110/paper_00046361_v525_n13_p_Chen
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