Gamma-Ray Emission Concurrent with the Nova in the Symbiotic Binary V407 Cygni

Abdo, A. A.; Ackermann, M.; Ajello, M.; Atwood, W. B.; Baldini, Luca; Ballet, J.; Barbiellini, G.; Bastieri, D.; Bechtol, K.; Bellazzini, R.; Berenji, B.; Blandford, R. D.; Bloom, E. D.; Bonamente, E.; Borgland, A. W.; Bouvier, A.; Brandt, T. J.; Bregeon, J.; Brez, A.; Brigida, M.; Bruel, Pascal; Buehler, R.; Burnett, T. H.; Buson, S.; Caliandro, G. A.; Cameron, R. A.; Caraveo, P. A.; Carrigan, S.; Casandjian, J. M.; Cecchi, C.; Çelik, Ö.; Charles, E.; Chaty, S.; Chekhtman, A.; Cheung, C. C.; Chiang, J.; Ciprini, S.; Claus, R.; Cohen-Tanugi, J.; Conrad, J.; Corbel, S.; Corbet, R. H. D.; DeCesar, Megan E.; Hartog, P. R. den; Dermer, C. D.; Palma, F. de; Digel, S. W.; Donato, D.; Silva, E. do Couto e; Drell, P. S.; Dubois, R.; Dubus, G.; Dumora, D.; Favuzzi, C.; Fegan, S. J.; Ferrara, E. C.; Fortin, P.; Frailis, M.; Fuhrmann, L.; Fukazawa, Y.; Funk, S.; Fusco, P.; Gargano, F.; Gasparrini, D.; Gehrels, N.; Germani, S.; Giglietto, N.; Giordano, F.; Giroletti, M.; Glanzman, T.; Godfrey, G.; Grenier, I. A.; Grondin, M.‐H.; Grove, J. E.; Guiriec, S.; Hadasch, D.; Harding, A. K.; Hayashida, M.; Hays, E.; Healey, S. E.; Hill, A. B.; Horan, D.; Hughes, R. E.; Itoh, R.; Jean, P.; Jóhannesson, G.; Johnson, A. S.; Johnson, R. P.; Johnson, T. J.; Johnson, W. N.; Kamae, T.; Katagiri, H.; Kataoka, J.; Kerr, M.; Knödlseder, J.; Koerding, E.; Kuss, M.; Landé, J.; Latronico, L.; Lee, S.-H.; Lemoine‐Goumard, M.; Garde, M. Llena; Longo, F.; Loparco, F.; Lott, B.; Lovellette, M. N.; Lubrano, P.; Makeev, A.; Mazziotta, M. N.; McConville, W.; McEnery, J. E.; Méhault, J.; Michelson, P. F.; Mizuno, T.; Моисеев, А. А.; Monte, C.; Monzani, M. E.; Morselli, A.; Moskalenko, I. V.; Murgia, S.; Nakamori, Takeshi; Naumann-Godó, M.; Nestoras, I.; Nolan, P. L.; Norris, J. P.; Nuss, E.; Ohno, Masahiro; Ohsugi, T.; Okumura, A.; Omodei, N.; Orlando, E.; Ormes, J. F.; Ozaki, Masanori; Paneque, D.; Panetta, J.; Parent, D.; Pelassa, V.; Pepé, M.; Pesce-Rollins, M.; Piron, F.; Porter, T. A.; Rainò, S.; Rando, R.; Ray, Paul S.; Razzano, M.; Razzaque, S.; Rea, N.; Reimer, A.; Reimer, O.; Reposeur, T.; Ripken, J.; Ritz, S.; Romani, Roger W.; Roth, M.; Sadrozinski, H. F-W.; Sander, A.; Parkinson, P. M. Saz; Scargle, Jeffrey D.; Schinzel, F. K.; Sgrò, C.; Shaw, M. S.; Siskind, E. J.; Smith, D. A.; Smith, P. D.; Sokolovsky, K. V.; Spandre, G.; Spinelli, P.; Stawarz, Ł.; Strickman, M. S.; Suson, D. J.; Takahashi, H.; Takahashi, Tadayuki; Tanaka, Takaaki; Tanaka, Yasuyuki; Thayer, J. B.; Thayer, J. G.; Thompson, D. J.; Tibaldo, L.; Torres, D. F.; Tosti, G.; Tramacere, A.; Uchiyama, Y.; Usher, T.; Vandenbroucke, J.; Vasileiou, V.; Vilchez, N.; Vitale, V.; Waite, A. P.; Wallace, E.; Wang, P.; Winer, B. L.; Wolff, M. T.; Wood, K. S.; Yang, Z.; Ylinen, T.; Ziegler, M.; Maehara, Hiroyuki; Nishiyama, K.; Kabashima, F.; Bach, U.; Bower, Geoffrey C.; Falcone, A.; Forster, J. R.; Henden, A.; Kawabata, Koji S.; Koubský, P.; Mukai, K.; Nelson, Thomas; Oates, S. R.; Sakimoto, K.; Sasada, Mahito; Шенаврин, В. И.; Shore, Steven N.; Skinner, G.; Sokoloski, J. L.; Stroh, M. C.; Татарников, А. М.; Uemura, Makoto; Wahlgren, G. M.; Yamanaka, Masahito

doi:10.1126/science.1192537

Cited by 195 publications

(153 citation statements)

References 22 publications

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“…Since the discovery of γ-rays from novae by the Fermi Gamma-ray Space Telescope (Fermi) in 2010 (Cheung et al 2010;Abdo et al 2010), the production of early, high-energy shocks in the ejecta of novae has become an increasingly important topic in the field of nova studies. These shocks can be caused by collisions with pre-existing circumstellar material (eg., V407 Cyg, V745 Sco, and RS Oph; Bode et al 2006;Das et al 2006; interactions between multiple flows from the same eruption (eg., V959 Mon, T Pyx, V382 Vel; Mukai & Ishida 2001;Nelson et al 2014;.…”

Section: Introductionmentioning

confidence: 99%

Shock-powered radio emission from V5589 Sagittarii (Nova Sgr 2012 #1)

Weston

Sokoloski

Chomiuk

et al. 2016

Mon. Not. R. Astron. Soc.

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Since the Fermi discovery of γ-rays from novae, one of the biggest questions in the field has been how novae generate such high-energy emission. Shocks must be a fundamental ingredient. Six months of radio observations of the 2012 nova V5589 Sgr with the VLA and 15 weeks of X-ray observations with Swift/XRT show that the radio emission consisted of: 1) a shock-powered, non-thermal flare; and 2) weak thermal emission from 10 −5 M of freely expanding, photoionized ejecta. Absorption features in the optical spectrum and the peak optical brightness suggest that V5589 Sgr lies 4 kpc away (3.2-4.6 kpc). The shock-powered flare dominated the radio light curve at low frequencies before day 100. The spectral evolution of the radio flare, its high radio brightness temperature, the presence of unusually hard (kT x > 33 keV) X-rays, and the ratio of radio to X-ray flux near radio maximum all support the conclusions that the flare was shock-powered and non-thermal. Unlike most other novae with strong shock-powered radio emission, V5589 Sgr is not embedded in the wind of a redgiant companion. Based on the similar inclinations and optical line profiles of V5589 Sgr and V959 Mon, we propose that shocks in V5589 Sgr formed from collisions between a slow flow with an equatorial density enhancement and a subsequent faster flow. We speculate that the relatively high speed and low mass of the ejecta led to the unusual radio emission from V5589 Sgr, and perhaps also to the non-detection of γ-rays.

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Section: Introductionmentioning

confidence: 99%

Shock-powered radio emission from V5589 Sagittarii (Nova Sgr 2012 #1)

Weston

Sokoloski

Chomiuk

et al. 2016

Mon. Not. R. Astron. Soc.

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“…Later on, they were essential to sketch the basic details of the emission processes [1]: the interaction between the nova shell and the dense ambient medium of the red giant seems able to accelerate protons, and ultimately produce γ rays through pp collisions and π 0 decay; alternatively, γ rays could be produced by inverse Compton scattering of the RG radiation.…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, subsequent analysis of the LAT data indicated the first gamma-ray detection on March 10th, the same day as the observed optical peak [10]. This marked the first γ-ray detection of any nova and more generally the first clear γ-ray detection of any source associated with a white dwarf [1].…”

Section: Introductionmentioning

confidence: 99%

E-EVN observations of the first gamma-ray nova V407 Cyg

Giroletti¹,

Koerding²,

Sokolovsky³

et al. 2016

Proceedings of 11th European VLBI Network Symposium &Amp; Users Meeting — PoS(11th EVN Symposium)

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In 2010 March, the Large Area Telescope (LAT) on board Fermi revealed a transient high-energy > 100 MeV gamma-ray source, positionally coincident with the optical nova in the symbiotic binary, V407 Cyg. This event marked the unexpected discovery of gamma-ray emission from a nova and triggered a wealth of follow up campaigns at all frequencies. Taking advantage of the real time capabilities and of the extraordinary sensitivity of the European VLBI Network (EVN), we rapidly obtained a > 5σ detection of a compact radio source at the position of V407 Cyg. Encouraged by this finding, we continued to monitor the source at 1.7 and 5 GHz for six months and observed its expansion and brightening. Our data reveal an asymmetric expanding shell and an emitting feature of uncertain nature outside the shell. We show here for the first time the resolved radio images obtained from our campaign on this unique target.

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“…The first Fermi LAT transient for which a Galactic origin could be demonstrated was Fermi J2102+4542 [1]. It was identified as a classical nova outburst in the symbiotic star V407 Cyg [2]. This detection established novae as a new class of gamma-ray sources and is the first detection of GeV gamma rays from a symbiotic star.…”

Section: Introductionmentioning

confidence: 99%

Unidentified Fermi LAT transients near the galactic plane

Pandel¹

2017

AIP Conference Proceedings

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Abstract. The Fermi LAT has detected numerous transient gamma-ray sources near the Galactic plane, several of which have been shown to be located within our Galaxy. We present an analysis of LAT Pass 8 data of seven previously reported, but still unidentified transient gamma-ray sources located within 10 • of the Galactic plane. We detect significant gamma-ray emission lasting several days for three of these sources: Fermi J0035+6131, Fermi J0905-3527, and Fermi J0910-5041. However, we were not able to detect the increase in gamma-ray emission that has previously been reported in the other four cases. We also review available multiwavelength data for the transients and discuss potential counterparts.

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Gamma-Ray Emission Concurrent with the Nova in the Symbiotic Binary V407 Cygni

Cited by 195 publications

References 22 publications

Shock-powered radio emission from V5589 Sagittarii (Nova Sgr 2012 #1)

Shock-powered radio emission from V5589 Sagittarii (Nova Sgr 2012 #1)

E-EVN observations of the first gamma-ray nova V407 Cyg

Unidentified Fermi LAT transients near the galactic plane

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