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Discovery of variable VHE gamma-ray emission from the binary system 1FGL J1018.6-5856
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Discovery of variable VHE gamma-ray emission from the binary system 1FGL J1018.6-5856
Bibliographic description
| title: | Discovery of variable VHE gamma-ray emission from the binary system 1FGL J1018.6-5856 |
| author: | Abramowski A., Aharonian F., Ait Benkhali F., Akhperjanian A. G., Angüner E. O., Backes M., Balzer A., Becherini Y., Becker Tjus J., Berge D., Bernhard S., Bernlöhr K., Birsin E., Blackwell R., Böttcher M., Boisson C., Bolmont J., Bordas P., Bregeon J., Brun F., Brun P., Bryan M., Bulik T., Carr J., Casanova S., Chakraborty N., Chalme-Calvet R., Chaves R. C. G., Chen A., Chrétien M., Colafrancesco S., Cologna G., Conrad J., Couturier C., Cui Y., Davids I. D., Degrange B., Deil C., deWilt P., Djannati-Ataï A., Domainko W., Donath A., O'C. Drury L., Dubus G., Dutson K., Dyks J., Dyrda M., Edwards T., Egberts K., Eger P., Ernenwein J.-P., Espigat P., Farnier C., Fegan S., Feinstein F., Fernandes M. V., Fernandez D., Fiasson A., Fontaine G., Förster A., Füßling M., Gabici S., Gajdus M., Gallant Y. A., Garrigoux T., Giavitto G., Giebels B., Glicenstein J. F., Gottschall D., Goyal Arti, Grondin M.-H., Grudzińska M., Hadasch D., Häffner S., Hahn J., Hawkes J., Heinzelmann G., Henri G., Hermann G., Hervet O., Hillert A., Hinton J. A., Hofmann W., Hofverberg P., Hoischen C., Holler M., Horns D., Ivascenko A., Jacholkowska A., Jahn C., Jamrozy Marek  , Janiak M., Jankowsky F., Jung-Richardt I., Kastendieck M. A., Katarzyński K., Katz U., Kerszberg D., Khélifi B., Kieffer M., Klepser S., Klochkov D., Kluźniak W., Kolitzus D., Komin Nu., Kosack K., Krakau S., Krayzel F., Krüger P. P., Laffon H., Lamanna G., Lau J., Lefaucheur J., Lefranc V., Lemière A., Lemoine-Goumard M., Lenain J.-P., Lohse T., Lopatin A., Lu C.-C., Lui R., Marandon V., Marcowith A., Mariaud C., Marx R., Maurin G., Maxted N., Mayer M., Meintjes P. J., Menzler U., Meyer M., Mitchell A. M. W., Moderski R., Mohamed M., Morå K., Moulin E., Murach T., de Naurois M., Niemiec J., Oakes L., Odaka H., Öttl S., Ohm S., de Oña Wilhelmi E., Opitz B., Ostrowski Michał , Oya I., Panter M., Parsons R. D., Arribas M. Paz, Pekeur N. W., Pelletier G., Petrucci P.-O., Peyaud B., Pita S., Poon H., Prokoph H., Pühlhofer G., Punch M., Quirrenbach A., Raab S., Reichardt I., Reimer A., Reimer O., Renaud M., de los Reyes R., Rieger F., Romoli C., Rosier-Lees S., Rowell G., Rudak B., Rulten C. B., Sahakian V., Salek D., Sanchez D. A., Santangelo A., Sasaki M., Schlickeiser R., Schüssler F., Schulz A., Schwanke U., Schwemmer S., Seyffert A. S., Simoni R., Sol H., Spanier F., Spengler G., Spies F., Stawarz Łukasz , Steenkamp R., Stegmann C., Stinzing F., Stycz K., Sushch I., Tavernet J.-P., Tavernier T., Taylor A. M., Terrier R., Tluczykont M., Trichard C., Valerius K., van der Walt J., van Eldik C., van Soelen B., Vasileiadis G., Veh J., Venter C., Viana A., Vincent P., Vink J., Voisin F., Völk H. J., Vuillaume T., Wagner S. J., Wagner P., Wagner R. M., Weidinger M., Weitzel Q., White R., Wierzcholska Alicja , Willmann P., Wörnlein A., Wouters D., Yang R., Zabalza V., Zaborov D., Zacharias M., Zdziarski A. A., Zech A., Zefi F., Żywucka-Hejzner Natalia
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| institution: | H.E.S.S. Collaboration |
| journal title: | Astronomy & Astrophysics |
| volume: | 577 |
| date of publication : | 2015 |
| article ID: | A131 |
| ISSN: |
0004-6361 |
| eISSN: |
1432-0746 |
| DOI: | |
| notes: | Reproduced with permission from Astronomy & Astrophysics, © ESO |
| language: | English |
| journal language: | English |
| abstract in English: | Re-observations with the HESS telescope array of the very high-energy (VHE) source HESS J1018–589 A that is coincident with the Fermi-LAT gamma-ray binary 1FGL J1018.6–5856 have resulted in a source detection significance of more than 9\sigma and the detection of variability ($\chi^{2}/v$ of 238.3/155) in the emitted gamma-ray flux. This variability confirms the association of HESS J1018–589 A with the high-energy $\gamma$-ray binary detected by Fermi-LAT and also confirms the point-like source as a new VHE binary system. The spectrum of HESS J1018–589 A is best fit with a power-law function with photon index $\Gamma = 2.20 \pm 0.14_{stat} \pm 0.2_{sys}$. Emission is detected up to $\sim$20 TeV. The mean differential flux level is $(2.9 \pm 0.4) \times 10^{-13} TeV^{-1} cm^{-2} s^{-1}$ at 1 TeV, equivalent to $\sim$1% of the flux from the Crab Nebula at the same energy. Variability is clearly detected in the night-by-night light curve. When folded on the orbital period of 16.58 days, the rebinned light curve peaks in phase with the observed X-ray and high-energy phaseograms. The fit of the HESS phaseogram to a constant flux provides evidence of periodicity at the level of $N\sigma>3\sigma$. The shape of the VHE phaseogram and measured spectrum suggest a low-inclination, low-eccentricity system with amodest impact from VHE gamma-ray absorption due to pair production ($\tau \leqslant $1 at 300 GeV). |
| keywords in English: | acceleration of particles, gamma rays: stars, radiation mechanisms: non-thermal, stars: individual: 1FGL J1018.6-5856, X-rays: binaries |
| affiliation: | Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne |
| type: | journal article |
| subtype: | academic paper |
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Except where otherwise noted, this item's license is described as Udzielam licencji. Uznanie autorstwa - Użycie niekomercyjne - Na tych samych warunkach 4.0 Międzynarodowa
Projekt „Repozytorium otwartego dostępu do dorobku naukowego i dydaktycznego UJ” współfinansowany w ramach poddziałania 2.3.1 „Cyfrowe udostępnianie zasobów nauki” Programu Operacyjnego Polska Cyfrowa z Europejskiego Funduszu Rozwoju Regionalnego i budżetu państwa na podstawie umowy o dofinansowanie nr POPC.02.03.01-00-0030/17-00
