Discovery of variable VHE γ -ray emission from the binary system 1FGL J1018.6-5856

A. Abramowski; F. Aharonian; F. Ait Benkhali; A. G. Akhperjanian; E. O. Angüner; M. Backes; A. Balzer; Y. Becherini; J. Becker Tjus; D. Berge; S. Bernhard; K. Bernlöhr; E. Birsin; R. Blackwell; M. Böttcher; C. Boisson; J. Bolmont; P. Bordas; J. Bregeon; F. Brun; P. Brun; M. Bryan; T. Bulik; J. Carr; S. Casanova; N. Chakraborty; R. Chalme-Calvet; R. C G Chaves; A. Chen; M. Chrétien; S. Colafrancesco; G. Cologna; J. Conrad; C. Couturier; Y. Cui; I. D. Davids; B. Degrange; C. Deil; P. Dewilt; A. Djannati-Ataï; W. Domainko; A. Donath; L. O C Drury; G. Dubus; K. Dutson; J. Dyks; M. Dyrda; T. Edwards; K. Egberts; P. Eger; J. P. Ernenwein; P. Espigat; C. Farnier; S. Fegan; F. Feinstein; M. V. Fernandes; D. Fernandez; A. Fiasson; G. Fontaine; A. Förster; M. Füßling; S. Gabici; M. Gajdus; Y. A. Gallant; T. Garrigoux; G. Giavitto; B. Giebels; J. F. Glicenstein; D. Gottschall; A. Goyal; M. H. Grondin; M. Grudzińska; D. Hadasch; S. Häffner; J. Hahn; J. Hawkes; G. Heinzelmann; G. Henri; G. Hermann; O. Hervet; A. Hillert; J. A. Hinton; W. Hofmann; P. Hofverberg; C. Hoischen; M. Holler; D. Horns; A. Ivascenko; A. Jacholkowska; C. Jahn; M. Jamrozy; M. Janiak; F. Jankowsky; I. Jung-Richardt; M. A. Kastendieck; K. Katarzyński; U. Katz; D. Kerszberg; B. Khélifi; M. Kieffer; S. Klepser; D. Klochkov; W. Kluźniak; D. Kolitzus; Nu Komin; K. Kosack; S. Krakau; F. Krayzel; P. P. Krüger; H. Laffon; G. Lamanna; J. Lau; J. Lefaucheur; V. Lefranc; A. Lemière; M. Lemoine-Goumard; J. P. Lenain; T. Lohse; A. Lopatin; C. C. Lu; R. Lui; V. Marandon; A. Marcowith; C. Mariaud; R. Marx; G. Maurin; N. Maxted; M. Mayer; P. J. Meintjes; U. Menzler; M. Meyer; A. M W Mitchell; R. Moderski; M. Mohamed; K. Morå; E. Moulin; T. Murach; M. De Naurois; J. Niemiec; L. Oakes; H. Odaka; S. Öttl; S. Ohm; E. De Oña Wilhelmi; B. Opitz; M. Ostrowski; I. Oya; M. Panter; R. D. Parsons; M. Paz Arribas; N. W. Pekeur; G. Pelletier; P. O. Petrucci; B. Peyaud; S. Pita; H. Poon; H. Prokoph; G. Pühlhofer; M. Punch; A. Quirrenbach; S. Raab; I. Reichardt; A. Reimer; O. Reimer; M. Renaud; R. De Los Reyes; F. Rieger; C. Romoli; S. Rosier-Lees; G. Rowell; B. Rudak; C. B. Rulten; V. Sahakian; D. Salek; D. A. Sanchez; A. Santangelo; M. Sasaki; R. Schlickeiser; F. Schüssler; A. Schulz; U. Schwanke; S. Schwemmer; A. S. Seyffert; R. Simoni; H. Sol; F. Spanier; G. Spengler; F. Spies; [No Value] Stawarz; R. Steenkamp; C. Stegmann; F. Stinzing; K. Stycz; I. Sushch; J. P. Tavernet; T. Tavernier; A. M. Taylor; R. Terrier; M. Tluczykont; C. Trichard; K. Valerius; J. Van Der Walt; C. Van Eldik; B. Van Soelen; G. Vasileiadis; J. Veh; C. Venter; A. Viana; P. Vincent; J. Vink; F. Voisin; H. J. Völk; T. Vuillaume; S. J. Wagner; P. Wagner; R. M. Wagner; M. Weidinger; Q. Weitzel; R. White; A. Wierzcholska; P. Willmann; A. Wörnlein; D. Wouters; R. Yang; V. Zabalza; D. Zaborov; M. Zacharias; A. A. Zdziarski; A. Zech; F. Zefi; N. Zywucka

doi:10.1051/0004-6361/201525699

Discovery of variable VHE γ -ray emission from the binary system 1FGL J1018.6-5856

A. Abramowski
, F. Aharonian
, F. Ait Benkhali
, A. G. Akhperjanian
, E. O. Angüner
, M. Backes
, A. Balzer
, Y. Becherini
, J. Becker Tjus
, D. Berge
, S. Bernhard
, K. Bernlöhr
, E. Birsin
, R. Blackwell
, M. Böttcher
, C. Boisson
, J. Bolmont
, P. Bordas
, J. Bregeon
, F. Brun

P. Brun, M. Bryan, T. Bulik, J. Carr, S. Casanova, N. Chakraborty, R. Chalme-Calvet, R. C G Chaves, A. Chen, M. Chrétien, S. Colafrancesco, G. Cologna, J. Conrad, C. Couturier, Y. Cui, I. D. Davids, B. Degrange, C. Deil, P. Dewilt, A. Djannati-Ataï, W. Domainko, A. Donath, L. O C Drury, G. Dubus, K. Dutson, J. Dyks, M. Dyrda, T. Edwards, K. Egberts, P. Eger, J. P. Ernenwein, P. Espigat, C. Farnier, S. Fegan, F. Feinstein, M. V. Fernandes, D. Fernandez, A. Fiasson, G. Fontaine, A. Förster, M. Füßling, S. Gabici, M. Gajdus, Y. A. Gallant, T. Garrigoux, G. Giavitto, B. Giebels, J. F. Glicenstein, D. Gottschall, A. Goyal, M. H. Grondin, M. Grudzińska, D. Hadasch, S. Häffner, J. Hahn, J. Hawkes, G. Heinzelmann, G. Henri, G. Hermann, O. Hervet, A. Hillert, J. A. Hinton, W. Hofmann, P. Hofverberg, C. Hoischen, M. Holler, D. Horns, A. Ivascenko, A. Jacholkowska, C. Jahn, M. Jamrozy, M. Janiak, F. Jankowsky, I. Jung-Richardt, M. A. Kastendieck, K. Katarzyński, U. Katz, D. Kerszberg, B. Khélifi, M. Kieffer, S. Klepser, D. Klochkov, W. Kluźniak, D. Kolitzus, Nu Komin, K. Kosack, S. Krakau, F. Krayzel, P. P. Krüger, H. Laffon, G. Lamanna, J. Lau, J. Lefaucheur, V. Lefranc, A. Lemière, M. Lemoine-Goumard, J. P. Lenain, T. Lohse, A. Lopatin, C. C. Lu, R. Lui, V. Marandon, A. Marcowith, C. Mariaud, R. Marx, G. Maurin, N. Maxted, M. Mayer, P. J. Meintjes, U. Menzler, M. Meyer, A. M W Mitchell, R. Moderski, M. Mohamed, K. Morå, E. Moulin, T. Murach, M. De Naurois, J. Niemiec, L. Oakes, H. Odaka, S. Öttl, S. Ohm, E. De Oña Wilhelmi, B. Opitz, M. Ostrowski, I. Oya, M. Panter, R. D. Parsons, M. Paz Arribas, N. W. Pekeur, G. Pelletier, P. O. Petrucci, B. Peyaud, S. Pita, H. Poon, H. Prokoph, G. Pühlhofer, M. Punch, A. Quirrenbach, S. Raab, I. Reichardt, A. Reimer, O. Reimer, M. Renaud, R. De Los Reyes, F. Rieger, C. Romoli, S. Rosier-Lees, G. Rowell, B. Rudak, C. B. Rulten, V. Sahakian, D. Salek, D. A. Sanchez, A. Santangelo, M. Sasaki, R. Schlickeiser, F. Schüssler, A. Schulz, U. Schwanke, S. Schwemmer, A. S. Seyffert, R. Simoni, H. Sol, F. Spanier, G. Spengler, F. Spies, [No Value] Stawarz, R. Steenkamp, C. Stegmann, F. Stinzing, K. Stycz, I. Sushch, J. P. Tavernet, T. Tavernier, A. M. Taylor, R. Terrier, M. Tluczykont, C. Trichard, K. Valerius, J. Van Der Walt, C. Van Eldik, B. Van Soelen, G. Vasileiadis, J. Veh, C. Venter, A. Viana, P. Vincent, J. Vink, F. Voisin, H. J. Völk, T. Vuillaume, S. J. Wagner, P. Wagner, R. M. Wagner, M. Weidinger, Q. Weitzel, R. White, A. Wierzcholska, P. Willmann, A. Wörnlein, D. Wouters, R. Yang, V. Zabalza, D. Zaborov, M. Zacharias, A. A. Zdziarski, A. Zech, F. Zefi, N. Zywucka

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

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 γ-ray binary 1FGL J1018.6-5856 have resulted in a source detection significance of more than 9σ and the detection of variability (χ²/ν of 238.3/155) in the emitted γ-ray flux. This variability confirms the association of HESS J1018-589 A with the high-energy γ-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 Γ = 2.20 ± 0.14_stat ± 0.2_sys. Emission is detected up to ∼20 TeV. The mean differential flux level is (2.9 ± 0.4) × 10^-13 TeV^-1 cm^-2 s^-1 at 1 TeV, equivalent to ∼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_σ> 3σ. The shape of the VHE phaseogram and measured spectrum suggest a low-inclination, low-eccentricity system with amodest impact from VHE γ-ray absorption due to pair production (τ ≲ 1 at 300 GeV).

Original language	English (US)
Article number	A131
Journal	Astronomy and Astrophysics
Volume	577
DOIs	https://doi.org/10.1051/0004-6361/201525699
State	Published - May 1 2015

Bibliographical note

Publisher Copyright:
© 2015 ESO.

Keywords

Acceleration of particles
Gamma rays: stars
Radiation mechanisms: non-thermal
Stars: individual: 1FGL J1018.6-5856
X-rays: binaries

Publisher link

10.1051/0004-6361/201525699

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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., ... Zywucka, N. (2015). Discovery of variable VHE γ -ray emission from the binary system 1FGL J1018.6-5856. Astronomy and Astrophysics, 577, Article A131. https://doi.org/10.1051/0004-6361/201525699

Abramowski, A, Aharonian, F, Ait Benkhali, F, Akhperjanian, AG, Angüner, EO, 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, RCG, Chen, A, Chrétien, M, Colafrancesco, S, Cologna, G, Conrad, J, Couturier, C, Cui, Y, Davids, ID, Degrange, B, Deil, C, Dewilt, P, Djannati-Ataï, A, Domainko, W, Donath, A, Drury, LOC, Dubus, G, Dutson, K, Dyks, J, Dyrda, M, Edwards, T, Egberts, K, Eger, P, Ernenwein, JP, Espigat, P, Farnier, C, Fegan, S, Feinstein, F, Fernandes, MV, Fernandez, D, Fiasson, A, Fontaine, G, Förster, A, Füßling, M, Gabici, S, Gajdus, M, Gallant, YA, Garrigoux, T, Giavitto, G, Giebels, B, Glicenstein, JF, Gottschall, D, Goyal, A, Grondin, MH, Grudzińska, M, Hadasch, D, Häffner, S, Hahn, J, Hawkes, J, Heinzelmann, G, Henri, G, Hermann, G, Hervet, O, Hillert, A, Hinton, JA, Hofmann, W, Hofverberg, P, Hoischen, C, Holler, M, Horns, D, Ivascenko, A, Jacholkowska, A, Jahn, C, Jamrozy, M, Janiak, M, Jankowsky, F, Jung-Richardt, I, Kastendieck, MA, Katarzyński, K, Katz, U, Kerszberg, D, Khélifi, B, Kieffer, M, Klepser, S, Klochkov, D, Kluźniak, W, Kolitzus, D, Komin, N, Kosack, K, Krakau, S, Krayzel, F, Krüger, PP, Laffon, H, Lamanna, G, Lau, J, Lefaucheur, J, Lefranc, V, Lemière, A, Lemoine-Goumard, M, Lenain, JP, Lohse, T, Lopatin, A, Lu, CC, Lui, R, Marandon, V, Marcowith, A, Mariaud, C, Marx, R, Maurin, G, Maxted, N, Mayer, M, Meintjes, PJ, Menzler, U, Meyer, M, Mitchell, AMW, 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, M, Oya, I, Panter, M, Parsons, RD, Paz Arribas, M, Pekeur, NW, Pelletier, G, Petrucci, PO, 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, CB, Sahakian, V, Salek, D, Sanchez, DA, Santangelo, A, Sasaki, M, Schlickeiser, R, Schüssler, F, Schulz, A, Schwanke, U, Schwemmer, S, Seyffert, AS, Simoni, R, Sol, H, Spanier, F, Spengler, G, Spies, F, Stawarz, NV, Steenkamp, R, Stegmann, C, Stinzing, F, Stycz, K, Sushch, I, Tavernet, JP, Tavernier, T, Taylor, AM, 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, HJ, Vuillaume, T, Wagner, SJ, Wagner, P, Wagner, RM, Weidinger, M, Weitzel, Q, White, R, Wierzcholska, A, Willmann, P, Wörnlein, A, Wouters, D, Yang, R, Zabalza, V, Zaborov, D, Zacharias, M, Zdziarski, AA, Zech, A, Zefi, F & Zywucka, N 2015, 'Discovery of variable VHE γ -ray emission from the binary system 1FGL J1018.6-5856', Astronomy and Astrophysics, vol. 577, A131. https://doi.org/10.1051/0004-6361/201525699

@article{5d4f8407f5d1466f98c48ed64fc7d096,

title = "Discovery of variable VHE γ -ray emission from the binary system 1FGL J1018.6-5856",

abstract = "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 γ-ray binary 1FGL J1018.6-5856 have resulted in a source detection significance of more than 9σ and the detection of variability (χ2/ν of 238.3/155) in the emitted γ-ray flux. This variability confirms the association of HESS J1018-589 A with the high-energy γ-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 Γ = 2.20 ± 0.14stat ± 0.2sys. Emission is detected up to ∼20 TeV. The mean differential flux level is (2.9 ± 0.4) {\texttimes} 10-13 TeV-1 cm-2 s-1 at 1 TeV, equivalent to ∼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 Nσ> 3σ. The shape of the VHE phaseogram and measured spectrum suggest a low-inclination, low-eccentricity system with amodest impact from VHE γ-ray absorption due to pair production (τ ≲ 1 at 300 GeV).",

keywords = "Acceleration of particles, Gamma rays: stars, Radiation mechanisms: non-thermal, Stars: individual: 1FGL J1018.6-5856, X-rays: binaries",

author = "A. Abramowski and F. Aharonian and \{Ait Benkhali\}, F. and Akhperjanian, \{A. G.\} and Ang{\"u}ner, \{E. O.\} and M. Backes and A. Balzer and Y. Becherini and \{Becker Tjus\}, J. and D. Berge and S. Bernhard and K. Bernl{\"o}hr and E. Birsin and R. Blackwell and M. B{\"o}ttcher and C. Boisson and J. Bolmont and P. Bordas and J. Bregeon and F. Brun and P. Brun and M. Bryan and T. Bulik and J. Carr and S. Casanova and N. Chakraborty and R. Chalme-Calvet and Chaves, \{R. C G\} and A. Chen and M. Chr{\'e}tien and S. Colafrancesco and G. Cologna and J. Conrad and C. Couturier and Y. Cui and Davids, \{I. D.\} and B. Degrange and C. Deil and P. Dewilt and A. Djannati-Ata{\"i} and W. Domainko and A. Donath and Drury, \{L. O C\} and G. Dubus and K. Dutson and J. Dyks and M. Dyrda and T. Edwards and K. Egberts and P. Eger and Ernenwein, \{J. P.\} and P. Espigat and C. Farnier and S. Fegan and F. Feinstein and Fernandes, \{M. V.\} and D. Fernandez and A. Fiasson and G. Fontaine and A. F{\"o}rster and M. F{\"u}{\ss}ling and S. Gabici and M. Gajdus and Gallant, \{Y. A.\} and T. Garrigoux and G. Giavitto and B. Giebels and Glicenstein, \{J. F.\} and D. Gottschall and A. Goyal and Grondin, \{M. H.\} and M. Grudzi{\'n}ska and D. Hadasch and S. H{\"a}ffner and J. Hahn and J. Hawkes and G. Heinzelmann and G. Henri and G. Hermann and O. Hervet and A. Hillert and Hinton, \{J. A.\} and W. Hofmann and P. Hofverberg and C. Hoischen and M. Holler and D. Horns and A. Ivascenko and A. Jacholkowska and C. Jahn and M. Jamrozy and M. Janiak and F. Jankowsky and I. Jung-Richardt and Kastendieck, \{M. A.\} and K. Katarzy{\'n}ski and U. Katz and D. Kerszberg and B. Kh{\'e}lifi and M. Kieffer and S. Klepser and D. Klochkov and W. Klu{\'z}niak and D. Kolitzus and Nu Komin and K. Kosack and S. Krakau and F. Krayzel and Kr{\"u}ger, \{P. P.\} and H. Laffon and G. Lamanna and J. Lau and J. Lefaucheur and V. Lefranc and A. Lemi{\`e}re and M. Lemoine-Goumard and Lenain, \{J. P.\} and T. Lohse and A. Lopatin and Lu, \{C. C.\} and R. Lui and V. Marandon and A. Marcowith and C. Mariaud and R. Marx and G. Maurin and N. Maxted and M. Mayer and Meintjes, \{P. J.\} and U. Menzler and M. Meyer and Mitchell, \{A. M W\} and R. Moderski and M. Mohamed and K. Mor{\aa} and E. Moulin and T. Murach and \{De Naurois\}, M. and J. Niemiec and L. Oakes and H. Odaka and S. {\"O}ttl and S. Ohm and \{De O{\~n}a Wilhelmi\}, E. and B. Opitz and M. Ostrowski and I. Oya and M. Panter and Parsons, \{R. D.\} and \{Paz Arribas\}, M. and Pekeur, \{N. W.\} and G. Pelletier and Petrucci, \{P. O.\} and B. Peyaud and S. Pita and H. Poon and H. Prokoph and G. P{\"u}hlhofer and M. Punch and A. Quirrenbach and S. Raab and I. Reichardt and A. Reimer and O. Reimer and M. Renaud and \{De Los Reyes\}, R. and F. Rieger and C. Romoli and S. Rosier-Lees and G. Rowell and B. Rudak and Rulten, \{C. B.\} and V. Sahakian and D. Salek and Sanchez, \{D. A.\} and A. Santangelo and M. Sasaki and R. Schlickeiser and F. Sch{\"u}ssler and A. Schulz and U. Schwanke and S. Schwemmer and Seyffert, \{A. S.\} and R. Simoni and H. Sol and F. Spanier and G. Spengler and F. Spies and Stawarz, \{[No Value]\} and R. Steenkamp and C. Stegmann and F. Stinzing and K. Stycz and I. Sushch and Tavernet, \{J. P.\} and T. Tavernier and Taylor, \{A. M.\} and R. Terrier and M. Tluczykont and C. Trichard and K. Valerius and \{Van Der Walt\}, J. and \{Van Eldik\}, C. and \{Van Soelen\}, B. and G. Vasileiadis and J. Veh and C. Venter and A. Viana and P. Vincent and J. Vink and F. Voisin and V{\"o}lk, \{H. J.\} and T. Vuillaume and Wagner, \{S. J.\} and P. Wagner and Wagner, \{R. M.\} and M. Weidinger and Q. Weitzel and R. White and A. Wierzcholska and P. Willmann and A. W{\"o}rnlein and D. Wouters and R. Yang and V. Zabalza and D. Zaborov and M. Zacharias and Zdziarski, \{A. A.\} and A. Zech and F. Zefi and N. Zywucka",

note = "Publisher Copyright: {\textcopyright} 2015 ESO.",

year = "2015",

month = may,

day = "1",

doi = "10.1051/0004-6361/201525699",

language = "English (US)",

volume = "577",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

TY - JOUR

T1 - Discovery of variable VHE γ -ray emission from the binary system 1FGL J1018.6-5856

AU - Abramowski, A.

AU - Aharonian, F.

AU - Ait Benkhali, F.

AU - Akhperjanian, A. G.

AU - Angüner, E. O.

AU - Backes, M.

AU - Balzer, A.

AU - Becherini, Y.

AU - Becker Tjus, J.

AU - Berge, D.

AU - Bernhard, S.

AU - Bernlöhr, K.

AU - Birsin, E.

AU - Blackwell, R.

AU - Böttcher, M.

AU - Boisson, C.

AU - Bolmont, J.

AU - Bordas, P.

AU - Bregeon, J.

AU - Brun, F.

AU - Brun, P.

AU - Bryan, M.

AU - Bulik, T.

AU - Carr, J.

AU - Casanova, S.

AU - Chakraborty, N.

AU - Chalme-Calvet, R.

AU - Chaves, R. C G

AU - Chen, A.

AU - Chrétien, M.

AU - Colafrancesco, S.

AU - Cologna, G.

AU - Conrad, J.

AU - Couturier, C.

AU - Cui, Y.

AU - Davids, I. D.

AU - Degrange, B.

AU - Deil, C.

AU - Dewilt, P.

AU - Djannati-Ataï, A.

AU - Domainko, W.

AU - Donath, A.

AU - Drury, L. O C

AU - Dubus, G.

AU - Dutson, K.

AU - Dyks, J.

AU - Dyrda, M.

AU - Edwards, T.

AU - Egberts, K.

AU - Eger, P.

AU - Ernenwein, J. P.

AU - Espigat, P.

AU - Farnier, C.

AU - Fegan, S.

AU - Feinstein, F.

AU - Fernandes, M. V.

AU - Fernandez, D.

AU - Fiasson, A.

AU - Fontaine, G.

AU - Förster, A.

AU - Füßling, M.

AU - Gabici, S.

AU - Gajdus, M.

AU - Gallant, Y. A.

AU - Garrigoux, T.

AU - Giavitto, G.

AU - Giebels, B.

AU - Glicenstein, J. F.

AU - Gottschall, D.

AU - Goyal, A.

AU - Grondin, M. H.

AU - Grudzińska, M.

AU - Hadasch, D.

AU - Häffner, S.

AU - Hahn, J.

AU - Hawkes, J.

AU - Heinzelmann, G.

AU - Henri, G.

AU - Hermann, G.

AU - Hervet, O.

AU - Hillert, A.

AU - Hinton, J. A.

AU - Hofmann, W.

AU - Hofverberg, P.

AU - Hoischen, C.

AU - Holler, M.

AU - Horns, D.

AU - Ivascenko, A.

AU - Jacholkowska, A.

AU - Jahn, C.

AU - Jamrozy, M.

AU - Janiak, M.

AU - Jankowsky, F.

AU - Jung-Richardt, I.

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PY - 2015/5/1

Y1 - 2015/5/1

N2 - 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 γ-ray binary 1FGL J1018.6-5856 have resulted in a source detection significance of more than 9σ and the detection of variability (χ2/ν of 238.3/155) in the emitted γ-ray flux. This variability confirms the association of HESS J1018-589 A with the high-energy γ-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 Γ = 2.20 ± 0.14stat ± 0.2sys. Emission is detected up to ∼20 TeV. The mean differential flux level is (2.9 ± 0.4) × 10-13 TeV-1 cm-2 s-1 at 1 TeV, equivalent to ∼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 Nσ> 3σ. The shape of the VHE phaseogram and measured spectrum suggest a low-inclination, low-eccentricity system with amodest impact from VHE γ-ray absorption due to pair production (τ ≲ 1 at 300 GeV).

AB - 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 γ-ray binary 1FGL J1018.6-5856 have resulted in a source detection significance of more than 9σ and the detection of variability (χ2/ν of 238.3/155) in the emitted γ-ray flux. This variability confirms the association of HESS J1018-589 A with the high-energy γ-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 Γ = 2.20 ± 0.14stat ± 0.2sys. Emission is detected up to ∼20 TeV. The mean differential flux level is (2.9 ± 0.4) × 10-13 TeV-1 cm-2 s-1 at 1 TeV, equivalent to ∼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 Nσ> 3σ. The shape of the VHE phaseogram and measured spectrum suggest a low-inclination, low-eccentricity system with amodest impact from VHE γ-ray absorption due to pair production (τ ≲ 1 at 300 GeV).

KW - Acceleration of particles

KW - Gamma rays: stars

KW - Radiation mechanisms: non-thermal

KW - Stars: individual: 1FGL J1018.6-5856

KW - X-rays: binaries

UR - https://www.scopus.com/pages/publications/84930508059

UR - https://www.scopus.com/pages/publications/84930508059#tab=citedBy

U2 - 10.1051/0004-6361/201525699

DO - 10.1051/0004-6361/201525699

M3 - Article

AN - SCOPUS:84930508059

SN - 0004-6361

VL - 577

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A131

ER -

Discovery of variable VHE γ -ray emission from the binary system 1FGL J1018.6-5856

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