Discovery of VHE gamma rays from PKS 2005-489

F. Aharonian; A. G. Akhperjanian; K. M. Aye; A. R. Bazer-Bachi; M. Beilicke; W. Benbow; D. Berge; P. Berghaus; K. Bernlöhr; C. Boisson; O. Bolz; I. Braun; F. Breitling; A. M. Brown; J. Bussons Gordo; P. M. Chadwick; L. M. Chounet; R. Cornils; L. Costamante; B. Degrange; A. Djannati-Ataï; L. O.C. Drury; G. Dubus; D. Emmanoulopoulos; P. Espigat; F. Feinstein; P. Fleury; G. Fontaine; Y. Fuchs; S. Funk; Y. A. Gallant; B. Giebels; S. Gillessen; J. F. Glicenstein; P. Goret; C. Hadjichristidis; M. Hauser; G. Heinzelmann; G. Henri; G. Hermann; J. A. Hinton; W. Hofmann; M. Holleran; D. Horns; O. C. de Jager; B. Khélifi; N. Komin; A. Konopelko; I. J. Latham; R. le Gallou; A. Lemière; M. Lemoine-Goumard; N. Leroy; T. Lohse; O. Martineau-Huynh; A. Marcowith; C. Masterson; T. J.L. McComb; M. de Naurois; S. J. Nolan; A. Noutsos; K. J. Orford; J. L. Osborne; M. Ouchrif; M. Panter; G. Pelletier; S. Pita; G. Pühlhofer; M. Punch; B. C. Raubenheimer; M. Raue; J. Raux; S. M. Rayner; I. Redondo; A. Reimer; O. Reimer; J. Ripken; L. Rob; L. Rolland; G. Rowell; V. Sahakian; L. Saugé; S. Schlenker; R. Schlickeiser; C. Schuster; U. Schwanke; M. Siewert; H. Sol; R. Steenkamp; C. Stegmann; J. P. Tavernet; R. Terrier; C. G. Théoret; M. Tluczykont; G. Vasileiadis; C. Venter; P. Vincent; H. J. Völk; S. J. Wagner

doi:10.1051/0004-6361:200500113

Discovery of VHE gamma rays from PKS 2005-489

F. Aharonian
, A. G. Akhperjanian
, K. M. Aye
, A. R. Bazer-Bachi
, M. Beilicke
, W. Benbow
, D. Berge
, P. Berghaus
, K. Bernlöhr
, C. Boisson
, O. Bolz
, I. Braun
, F. Breitling
, A. M. Brown
, J. Bussons Gordo
, P. M. Chadwick
, L. M. Chounet
, R. Cornils
, L. Costamante
, B. Degrange

A. Djannati-Ataï, L. O.C. Drury, G. Dubus, D. Emmanoulopoulos, P. Espigat, F. Feinstein, P. Fleury, G. Fontaine, Y. Fuchs, S. Funk, Y. A. Gallant, B. Giebels, S. Gillessen, J. F. Glicenstein, P. Goret, C. Hadjichristidis, M. Hauser, G. Heinzelmann, G. Henri, G. Hermann, J. A. Hinton, W. Hofmann, M. Holleran, D. Horns, O. C. de Jager, B. Khélifi, N. Komin, A. Konopelko, I. J. Latham, R. le Gallou, A. Lemière, M. Lemoine-Goumard, N. Leroy, T. Lohse, O. Martineau-Huynh, A. Marcowith, C. Masterson, T. J.L. McComb, M. de Naurois, S. J. Nolan, A. Noutsos, K. J. Orford, J. L. Osborne, M. Ouchrif, M. Panter, G. Pelletier, S. Pita, G. Pühlhofer, M. Punch, B. C. Raubenheimer, M. Raue, J. Raux, S. M. Rayner, I. Redondo, A. Reimer, O. Reimer, J. Ripken, L. Rob, L. Rolland, G. Rowell, V. Sahakian, L. Saugé, S. Schlenker, R. Schlickeiser, C. Schuster, U. Schwanke, M. Siewert, H. Sol, R. Steenkamp, C. Stegmann, J. P. Tavernet, R. Terrier, C. G. Théoret, M. Tluczykont, G. Vasileiadis, C. Venter, P. Vincent, H. J. Völk, S. J. Wagner

Max-Planck-Institut für Kernphysik
Yerevan Physics Institute
Durham University
Centre national de la recherche scientifique
Universität Hamburg
Astroparticule and Cosmol APC
Université Libre de Bruxelles
Humboldt-Universität zu Berlin
LUTH - Laboratoire de l'Univers et de ses Theories
Université Paris-Sud
European Associated Laboratory for Gamma-Ray Astronomy
Dublin Institute for Advanced Studies
Landessternwarte Heidelberg
Institut Pierre Simon Laplace, CNRS and CEA
North-West University
Universités Paris VI and VII
The University of Sheffield
Ruhr-University Bochum
Charles University
University of Namibia

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

83 Citations (Scopus)

Abstract

The high-frequency peaked BL Lac PKS 2005-489 (z = 0.071) was observed in 2003 and 2004 with the HESS stereoscopic array of imaging atmospheric-Cherenkov telescopes in Namibia. A signal was detected at the 6.7σ level in the 2004 observations (24.2 h live time), but not in the 2003 data set (27.3 h live time). PKS 2005-489 is the first blazar independently discovered by HESS to be an emitter of VHE photons, and only the second such blazar in the Southern Hemisphere. The integral flux above 200 GeV observed in 2004 is (6.9 ± 1.0 _stat ± 1.4 _syst) × 10 ^-12 cm ^-2 s ^-1, corresponding to ∼2.5% of the flux observed from the Crab Nebula. The 99% upper limit on the flux in 2003, I(>200 GeV) < 5.2 × 10 ^-12 cm ^-2 s ^-1, is smaller than the flux measured in 2004, suggesting an increased level of activity in 2004. However, the data show no evidence for significant variability on any time scale less than a year. An energy spectrum is measured and is characterized by a very soft power law (photon index of Γ = 4.0 ± 0.4).

Original language	English
Pages (from-to)	L17-L20
Journal	Astronomy and Astrophysics
Volume	436
Issue number	2
DOIs	https://doi.org/10.1051/0004-6361:200500113
Publication status	Published - 1 Jun 2005
Externally published	Yes

Keywords

BL Lacertae objects: individual: PKS 2005-489
Galaxies: active
Gamma rays: observations

Access to Document

10.1051/0004-6361:200500113

Cite this

Aharonian, F., Akhperjanian, A. G., Aye, K. M., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., Berghaus, P., Bernlöhr, K., Boisson, C., Bolz, O., Braun, I., Breitling, F., Brown, A. M., Bussons Gordo, J., Chadwick, P. M., Chounet, L. M., Cornils, R., Costamante, L., ... Wagner, S. J. (2005). Discovery of VHE gamma rays from PKS 2005-489. Astronomy and Astrophysics, 436(2), L17-L20. https://doi.org/10.1051/0004-6361:200500113

@article{a1c5ee56d7474db9a948363d43281891,

title = "Discovery of VHE gamma rays from PKS 2005-489",

abstract = "The high-frequency peaked BL Lac PKS 2005-489 (z = 0.071) was observed in 2003 and 2004 with the HESS stereoscopic array of imaging atmospheric-Cherenkov telescopes in Namibia. A signal was detected at the 6.7σ level in the 2004 observations (24.2 h live time), but not in the 2003 data set (27.3 h live time). PKS 2005-489 is the first blazar independently discovered by HESS to be an emitter of VHE photons, and only the second such blazar in the Southern Hemisphere. The integral flux above 200 GeV observed in 2004 is (6.9 ± 1.0 stat ± 1.4 syst) {\texttimes} 10 -12 cm -2 s -1, corresponding to ∼2.5\% of the flux observed from the Crab Nebula. The 99\% upper limit on the flux in 2003, I(>200 GeV) < 5.2 {\texttimes} 10 -12 cm -2 s -1, is smaller than the flux measured in 2004, suggesting an increased level of activity in 2004. However, the data show no evidence for significant variability on any time scale less than a year. An energy spectrum is measured and is characterized by a very soft power law (photon index of Γ = 4.0 ± 0.4).",

keywords = "BL Lacertae objects: individual: PKS 2005-489, Galaxies: active, Gamma rays: observations",

author = "F. Aharonian and Akhperjanian, \{A. G.\} and Aye, \{K. M.\} and Bazer-Bachi, \{A. R.\} and M. Beilicke and W. Benbow and D. Berge and P. Berghaus and K. Bernl{\"o}hr and C. Boisson and O. Bolz and I. Braun and F. Breitling and Brown, \{A. M.\} and \{Bussons Gordo\}, J. and Chadwick, \{P. M.\} and Chounet, \{L. M.\} and R. Cornils and L. Costamante and B. Degrange and A. Djannati-Ata{\"i} and Drury, \{L. O.C.\} and G. Dubus and D. Emmanoulopoulos and P. Espigat and F. Feinstein and P. Fleury and G. Fontaine and Y. Fuchs and S. Funk and Gallant, \{Y. A.\} and B. Giebels and S. Gillessen and Glicenstein, \{J. F.\} and P. Goret and C. Hadjichristidis and M. Hauser and G. Heinzelmann and G. Henri and G. Hermann and Hinton, \{J. A.\} and W. Hofmann and M. Holleran and D. Horns and \{de Jager\}, \{O. C.\} and B. Kh{\'e}lifi and N. Komin and A. Konopelko and Latham, \{I. J.\} and \{le Gallou\}, R. and A. Lemi{\`e}re and M. Lemoine-Goumard and N. Leroy and T. Lohse and O. Martineau-Huynh and A. Marcowith and C. Masterson and McComb, \{T. J.L.\} and \{de Naurois\}, M. and Nolan, \{S. J.\} and A. Noutsos and Orford, \{K. J.\} and Osborne, \{J. L.\} and M. Ouchrif and M. Panter and G. Pelletier and S. Pita and G. P{\"u}hlhofer and M. Punch and Raubenheimer, \{B. C.\} and M. Raue and J. Raux and Rayner, \{S. M.\} and I. Redondo and A. Reimer and O. Reimer and J. Ripken and L. Rob and L. Rolland and G. Rowell and V. Sahakian and L. Saug{\'e} and S. Schlenker and R. Schlickeiser and C. Schuster and U. Schwanke and M. Siewert and H. Sol and R. Steenkamp and C. Stegmann and Tavernet, \{J. P.\} and R. Terrier and Th{\'e}oret, \{C. G.\} and M. Tluczykont and G. Vasileiadis and C. Venter and P. Vincent and V{\"o}lk, \{H. J.\} and Wagner, \{S. J.\}",

year = "2005",

month = jun,

day = "1",

doi = "10.1051/0004-6361:200500113",

language = "English",

volume = "436",

pages = "L17--L20",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

number = "2",

}

Aharonian, F, Akhperjanian, AG, Aye, KM, Bazer-Bachi, AR, Beilicke, M, Benbow, W, Berge, D, Berghaus, P, Bernlöhr, K, Boisson, C, Bolz, O, Braun, I, Breitling, F, Brown, AM, Bussons Gordo, J, Chadwick, PM, Chounet, LM, Cornils, R, Costamante, L, Degrange, B, Djannati-Ataï, A, Drury, LOC, Dubus, G, Emmanoulopoulos, D, Espigat, P, Feinstein, F, Fleury, P, Fontaine, G, Fuchs, Y, Funk, S, Gallant, YA, Giebels, B, Gillessen, S, Glicenstein, JF, Goret, P, Hadjichristidis, C, Hauser, M, Heinzelmann, G, Henri, G, Hermann, G, Hinton, JA, Hofmann, W, Holleran, M, Horns, D, de Jager, OC, Khélifi, B, Komin, N, Konopelko, A, Latham, IJ, le Gallou, R, Lemière, A, Lemoine-Goumard, M, Leroy, N, Lohse, T, Martineau-Huynh, O, Marcowith, A, Masterson, C, McComb, TJL, de Naurois, M, Nolan, SJ, Noutsos, A, Orford, KJ, Osborne, JL, Ouchrif, M, Panter, M, Pelletier, G, Pita, S, Pühlhofer, G, Punch, M, Raubenheimer, BC, Raue, M, Raux, J, Rayner, SM, Redondo, I, Reimer, A, Reimer, O, Ripken, J, Rob, L, Rolland, L, Rowell, G, Sahakian, V, Saugé, L, Schlenker, S, Schlickeiser, R, Schuster, C, Schwanke, U, Siewert, M, Sol, H, Steenkamp, R, Stegmann, C, Tavernet, JP, Terrier, R, Théoret, CG, Tluczykont, M, Vasileiadis, G, Venter, C, Vincent, P, Völk, HJ & Wagner, SJ 2005, 'Discovery of VHE gamma rays from PKS 2005-489', Astronomy and Astrophysics, vol. 436, no. 2, pp. L17-L20. https://doi.org/10.1051/0004-6361:200500113

TY - JOUR

T1 - Discovery of VHE gamma rays from PKS 2005-489

AU - Aharonian, F.

AU - Akhperjanian, A. G.

AU - Aye, K. M.

AU - Bazer-Bachi, A. R.

AU - Beilicke, M.

AU - Benbow, W.

AU - Berge, D.

AU - Berghaus, P.

AU - Bernlöhr, K.

AU - Boisson, C.

AU - Bolz, O.

AU - Braun, I.

AU - Breitling, F.

AU - Brown, A. M.

AU - Bussons Gordo, J.

AU - Chadwick, P. M.

AU - Chounet, L. M.

AU - Cornils, R.

AU - Costamante, L.

AU - Degrange, B.

AU - Djannati-Ataï, A.

AU - Drury, L. O.C.

AU - Dubus, G.

AU - Emmanoulopoulos, D.

AU - Espigat, P.

AU - Feinstein, F.

AU - Fleury, P.

AU - Fontaine, G.

AU - Fuchs, Y.

AU - Funk, S.

AU - Gallant, Y. A.

AU - Giebels, B.

AU - Gillessen, S.

AU - Glicenstein, J. F.

AU - Goret, P.

AU - Hadjichristidis, C.

AU - Hauser, M.

AU - Heinzelmann, G.

AU - Henri, G.

AU - Hermann, G.

AU - Hinton, J. A.

AU - Hofmann, W.

AU - Holleran, M.

AU - Horns, D.

AU - de Jager, O. C.

AU - Khélifi, B.

AU - Komin, N.

AU - Konopelko, A.

AU - Latham, I. J.

AU - le Gallou, R.

AU - Lemière, A.

AU - Lemoine-Goumard, M.

AU - Leroy, N.

AU - Lohse, T.

AU - Martineau-Huynh, O.

AU - Marcowith, A.

AU - Masterson, C.

AU - McComb, T. J.L.

AU - de Naurois, M.

AU - Nolan, S. J.

AU - Noutsos, A.

AU - Orford, K. J.

AU - Osborne, J. L.

AU - Ouchrif, M.

AU - Panter, M.

AU - Pelletier, G.

AU - Pita, S.

AU - Pühlhofer, G.

AU - Punch, M.

AU - Raubenheimer, B. C.

AU - Raue, M.

AU - Raux, J.

AU - Rayner, S. M.

AU - Redondo, I.

AU - Reimer, A.

AU - Reimer, O.

AU - Ripken, J.

AU - Rob, L.

AU - Rolland, L.

AU - Rowell, G.

AU - Sahakian, V.

AU - Saugé, L.

AU - Schlenker, S.

AU - Schlickeiser, R.

AU - Schuster, C.

AU - Schwanke, U.

AU - Siewert, M.

AU - Sol, H.

AU - Steenkamp, R.

AU - Stegmann, C.

AU - Tavernet, J. P.

AU - Terrier, R.

AU - Théoret, C. G.

AU - Tluczykont, M.

AU - Vasileiadis, G.

AU - Venter, C.

AU - Vincent, P.

AU - Völk, H. J.

AU - Wagner, S. J.

PY - 2005/6/1

Y1 - 2005/6/1

N2 - The high-frequency peaked BL Lac PKS 2005-489 (z = 0.071) was observed in 2003 and 2004 with the HESS stereoscopic array of imaging atmospheric-Cherenkov telescopes in Namibia. A signal was detected at the 6.7σ level in the 2004 observations (24.2 h live time), but not in the 2003 data set (27.3 h live time). PKS 2005-489 is the first blazar independently discovered by HESS to be an emitter of VHE photons, and only the second such blazar in the Southern Hemisphere. The integral flux above 200 GeV observed in 2004 is (6.9 ± 1.0 stat ± 1.4 syst) × 10 -12 cm -2 s -1, corresponding to ∼2.5% of the flux observed from the Crab Nebula. The 99% upper limit on the flux in 2003, I(>200 GeV) < 5.2 × 10 -12 cm -2 s -1, is smaller than the flux measured in 2004, suggesting an increased level of activity in 2004. However, the data show no evidence for significant variability on any time scale less than a year. An energy spectrum is measured and is characterized by a very soft power law (photon index of Γ = 4.0 ± 0.4).

AB - The high-frequency peaked BL Lac PKS 2005-489 (z = 0.071) was observed in 2003 and 2004 with the HESS stereoscopic array of imaging atmospheric-Cherenkov telescopes in Namibia. A signal was detected at the 6.7σ level in the 2004 observations (24.2 h live time), but not in the 2003 data set (27.3 h live time). PKS 2005-489 is the first blazar independently discovered by HESS to be an emitter of VHE photons, and only the second such blazar in the Southern Hemisphere. The integral flux above 200 GeV observed in 2004 is (6.9 ± 1.0 stat ± 1.4 syst) × 10 -12 cm -2 s -1, corresponding to ∼2.5% of the flux observed from the Crab Nebula. The 99% upper limit on the flux in 2003, I(>200 GeV) < 5.2 × 10 -12 cm -2 s -1, is smaller than the flux measured in 2004, suggesting an increased level of activity in 2004. However, the data show no evidence for significant variability on any time scale less than a year. An energy spectrum is measured and is characterized by a very soft power law (photon index of Γ = 4.0 ± 0.4).

KW - BL Lacertae objects: individual: PKS 2005-489

KW - Galaxies: active

KW - Gamma rays: observations

U2 - 10.1051/0004-6361:200500113

DO - 10.1051/0004-6361:200500113

M3 - Article

AN - SCOPUS:20544472123

SN - 0004-6361

VL - 436

SP - L17-L20

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 2

ER -

Discovery of VHE gamma rays from PKS 2005-489

Abstract

Keywords

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