SEARCH FOR EARLY GAMMA-RAY PRODUCTION IN SUPERNOVAE LOCATED IN A DENSE CIRCUMSTELLAR MEDIUM WITH THE FERMI LAT

Ackermann, M.; Arcavi, I.; Baldini, L.; Ballet, J.; BARBIELLINI AMIDEI, GUIDO; Bastieri, D.; Bellazzini, R.; Bissaldi, E.; Blandford, R. D.; Bonino, R.; Bottacini, E.; Brandt, T. J.; Bregeon, J.; Bruel, P.; Buehler, R.; Buson, S.; Caliandro, G. A.; Cameron, R. A.; Caragiulo, M.; Caraveo, P. A.; Cavazzuti, E.; Cecchi, C.; Charles, E.; Chekhtman, A.; Chiang, J.; Chiaro, G.; Ciprini, S.; Claus, R.; Cohen Tanugi, J.; Cutini, S.; D’Ammando, F.; Angelis, A. de; Palma, F. de; Desiante, R.; Venere, L. Di; Drell, P. S.; Favuzzi, C.; Fegan, S. J.; Franckowiak, A.; Funk, S.; Fusco, P.; Gal Yam, A.; Gargano, F.; Gasparrini, D.; Giglietto, N.; Giordano, F.; Giroletti, M.; Glanzman, T.; Godfrey, G.; Grenier, I. A.; Grove, J. E.; Guiriec, S.; Harding, A. K.; Hayashi, K.; Hewitt, J. W.; Hill, A. B.; Horan, D.; Jogler, T.; Jóhannesson, G.; Kocevski, D.; Kuss, M.; Larsson, S.; Lashner, J.; Latronico, L.; Li, J.; Li, L.; LONGO, FRANCESCO; Loparco, F.; Lovellette, M. N.; Lubrano, P.; Malyshev, D.; Mayer, M.; Mazziotta, M. N.; Mcenery, J. E.; Michelson, P. F.; Mizuno, T.; Monzani, M. E.; Morselli, A.; Murase, K.; Nugent, P.; Nuss, E.; Ofek, E.; Ohsugi, T.; Orienti, M.; Orlando, E.; Ormes, J. F.; Paneque, D.; Pesce Rollins, M.; Piron, F.; Pivato, G.; Rainò, S.; Rando, R.; Razzano, M.; Reimer, A.; Reimer, O.; Schulz, A.; Sgrò, C.; Siskind, E. J.; Spada, F.; Spandre, G.; Spinelli, P.; Suson, D. J.; Takahashi, H.; Thayer, J. B.; Tibaldo, L.; Torres, D. F.; Troja, E.; Vianello, G.; Werner, M.; Wood, K. S.; Wood, M.

doi:10.1088/0004-637X/807/2/169

Supernovae (SNe) exploding in a dense circumstellar medium (CSM) are hypothesized to accelerate cosmic rays in collisionless shocks and emit GeV γ-rays and TeV neutrinos on a timescale of several months. We perform the first systematic search for γ-ray emission in Fermi Large Area Telescope data in the energy range from 100 {MeV} to 300 {GeV} from the ensemble of 147 SNe Type IIn exploding in a dense CSM. We search for a γ-ray excess at each SNe location in a one-year time window. In order to enhance a possible weak signal, we simultaneously study the closest and optically brightest sources of our sample in a joint-likelihood analysis in three different time windows (1 year, 6 months, and 3 months). For the most promising source of the sample, SN 2010jl (PTF 10aaxf), we repeat the analysis with an extended time window lasting 4.5 years. We do not find a significant excess in γ-rays for any individual source nor for the combined sources and provide model-independent flux upper limits for both cases. In addition, we derive limits on the γ-ray luminosity and the ratio of γ-ray-to-optical luminosity ratio as a function of the index of the proton injection spectrum assuming a generic γ-ray production model. Furthermore, we present detailed flux predictions based on multi-wavelength observations and the corresponding flux upper limit at a 95% confidence level (CL) for the source SN 2010jl (PTF 10aaxf).

Titolo:	SEARCH FOR EARLY GAMMA-RAY PRODUCTION IN SUPERNOVAE LOCATED IN A DENSE CIRCUMSTELLAR MEDIUM WITH THE FERMI LAT
Autori:	Ackermann, M. Arcavi, I. Baldini, L. Ballet, J. BARBIELLINI AMIDEI, GUIDO Bastieri, D. Bellazzini, R. Bissaldi, E. Blandford, R. D. Bonino, R. Bottacini, E. Brandt, T. J. Bregeon, J. Bruel, P. Buehler, R. Buson, S. Caliandro, G. A. Cameron, R. A. Caragiulo, M. Caraveo, P. A. Cavazzuti, E. Cecchi, C. Charles, E. Chekhtman, A. Chiang, J. Chiaro, G. Ciprini, S. Claus, R. Cohen Tanugi, J. Cutini, S. D’Ammando, F. Angelis, A. de Palma, F. de Desiante, R. Venere, L. Di Drell, P. S. Favuzzi, C. Fegan, S. J. Franckowiak, A. Funk, S. Fusco, P. Gal Yam, A. Gargano, F. Gasparrini, D. Giglietto, N. Giordano, F. Giroletti, M. Glanzman, T. Godfrey, G. Grenier, I. A. Grove, J. E. Guiriec, S. Harding, A. K. Hayashi, K. Hewitt, J. W. Hill, A. B. Horan, D. Jogler, T. Jóhannesson, G. Kocevski, D. Kuss, M. Larsson, S. Lashner, J. Latronico, L. Li, J. Li, L. LONGO, FRANCESCO Loparco, F. Lovellette, M. N. Lubrano, P. Malyshev, D. Mayer, M. Mazziotta, M. N. Mcenery, J. E. Michelson, P. F. Mizuno, T. Monzani, M. E. Morselli, A. Murase, K. Nugent, P. Nuss, E. Ofek, E. Ohsugi, T. Orienti, M. Orlando, E. Ormes, J. F. Paneque, D. Pesce Rollins, M. Piron, F. Pivato, G. Rainò, S. Rando, R. Razzano, M. Reimer, A. Reimer, O. Schulz, A. Sgrò, C. Siskind, E. J. Spada, F. Spandre, G. Spinelli, P. Suson, D. J. Takahashi, H. Thayer, J. B. Tibaldo, L. Torres, D. F. Troja, E. Vianello, G. Werner, M. Wood, K. S. Wood, M. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2015
Rivista:	THE ASTROPHYSICAL JOURNAL
Abstract:	Supernovae (SNe) exploding in a dense circumstellar medium (CSM) are hypothesized to accelerate cosmic rays in collisionless shocks and emit GeV γ-rays and TeV neutrinos on a timescale of several months. We perform the first systematic search for γ-ray emission in Fermi Large Area Telescope data in the energy range from 100 {MeV} to 300 {GeV} from the ensemble of 147 SNe Type IIn exploding in a dense CSM. We search for a γ-ray excess at each SNe location in a one-year time window. In order to enhance a possible weak signal, we simultaneously study the closest and optically brightest sources of our sample in a joint-likelihood analysis in three different time windows (1 year, 6 months, and 3 months). For the most promising source of the sample, SN 2010jl (PTF 10aaxf), we repeat the analysis with an extended time window lasting 4.5 years. We do not find a significant excess in γ-rays for any individual source nor for the combined sources and provide model-independent flux upper limits for both cases. In addition, we derive limits on the γ-ray luminosity and the ratio of γ-ray-to-optical luminosity ratio as a function of the index of the proton injection spectrum assuming a generic γ-ray production model. Furthermore, we present detailed flux predictions based on multi-wavelength observations and the corresponding flux upper limit at a 95% confidence level (CL) for the source SN 2010jl (PTF 10aaxf).
Handle:	http://hdl.handle.net/11368/2842850
Digital Object Identifier (DOI):	http://dx.doi.org/10.1088/0004-637X/807/2/169
URL:	http://iopscience.iop.org/article/10.1088/0004-637X/807/2/169/pdf
Appare nelle tipologie:	1.1 Articolo in Rivista

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