Evidence for VHE γ-ray emission from the distant BL Lac PG 1553+113

F. Aharonian; A. G. Akhperjanian; A. R. Bazer-Bachi; M. Beilicke; W. Benbow; D. Berge; K. Bernlöhr; C. Boisson; O. Bolz; V. Borrel; I. Braun; F. Breitling; A. M. Brown; R. Bühler; S. Carrigan; P. M. Chadwick; L. M. Chounet; R. Cornils; L. Costamante; B. Degrange; H. J. Dickinson; A. Djannati-Ataï; L. O.C. Drury; G. Dubus; K. Egberts; D. Emmanoulopoulos; P. Espigat; F. Feinstein; G. Fontaine; S. Funk; Y. A. Gallant; B. Giebels; J. F. Glicenstein; P. Goret; C. Hadjichristidis; D. Hauser; M. Hauser; G. Heinzelmann; G. Henri; G. Hermann; J. A. Hinton; W. Hofmann; M. Holleran; D. Horns; A. Jacholkowska; O. C. de Jager; B. Khélifi; N. Komin; A. Konopelko; I. J. Latham; R. le Gallou; A. Lemière; M. Lemoine-Goumard; T. Lohse; J. M. Martin; O. Martineau-Huynh; A. Marcowith; C. Masterson; T. J.L. McComb; M. de Naurois; D. Nedbal; 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; S. M. Rayner; 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; D. Spangler; R. Steenkamp; C. Stegmann; G. Superina; J. P. Tavernet; R. Terrier; C. G. Théoret; M. Tluczykont; C. van Eldik; G. Vasileiadis; C. Venter; P. Vincent; H. J. Völk; S. J. Wagner; M. Ward

doi:10.1051/0004-6361:200600010

Evidence for VHE γ-ray emission from the distant BL Lac PG 1553+113

F. Aharonian
, A. G. Akhperjanian
, A. R. Bazer-Bachi
, M. Beilicke
, W. Benbow
, D. Berge
, K. Bernlöhr
, C. Boisson
, O. Bolz
, V. Borrel
, I. Braun
, F. Breitling
, A. M. Brown
, R. Bühler
, S. Carrigan
, P. M. Chadwick
, L. M. Chounet
, R. Cornils
, L. Costamante
, B. Degrange

H. J. Dickinson, A. Djannati-Ataï, L. O.C. Drury, G. Dubus, K. Egberts, D. Emmanoulopoulos, P. Espigat, F. Feinstein, G. Fontaine, S. Funk, Y. A. Gallant, B. Giebels, J. F. Glicenstein, P. Goret, C. Hadjichristidis, D. Hauser, M. Hauser, G. Heinzelmann, G. Henri, G. Hermann, J. A. Hinton, W. Hofmann, M. Holleran, D. Horns, A. Jacholkowska, O. C. de Jager, B. Khélifi, N. Komin, A. Konopelko, I. J. Latham, R. le Gallou, A. Lemière, M. Lemoine-Goumard, T. Lohse, J. M. Martin, O. Martineau-Huynh, A. Marcowith, C. Masterson, T. J.L. McComb, M. de Naurois, D. Nedbal, 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, S. M. Rayner, 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, D. Spangler, R. Steenkamp, C. Stegmann, G. Superina, J. P. Tavernet, R. Terrier, C. G. Théoret, M. Tluczykont, C. van Eldik, G. Vasileiadis, C. Venter, P. Vincent, H. J. Völk, S. J. Wagner, M. Ward

Max-Planck-Institut für Kernphysik
Yerevan Physics Institute
CNRS
Universität Hamburg
Humboldt-Universität zu Berlin
Sorbonne Univ.
Durham University
Ip Paris
European Associated Laboratory for Gamma-Ray Astronomy
Astroparticule and Cosmol APC
Dublin Institute for Advanced Studies
Landessternwarte Heidelberg
Laboratoire Univers et Particules de Montpellier
Institut Pierre Simon Laplace, CNRS and CEA
North-West University
Universités Paris VI and VII
Charles University
Ruhr-University Bochum
University of Namibia

Résultats de recherche: Contribution à un journal › Article › Revue par des pairs

Résumé

The high-frequency peaked BL Lac PG 1553+113 was observed in 2005 with the HESS stereoscopic array of imaging atmospheric-Cherenkov telescopes in Namibia. Using the HESS standard analysis, an excess was measured at the 4.0σ level in these observations (7.6 hours live time). Three alternative, lower-threshold analyses yield >5σ excesses. The observed integral flux above 200 GeV is (4.8 ± 1.3_stat ± 1.0_syst) × 10 ^-12 cm^-2 s^-1, and shows no evidence for variability. The measured energy spectrum is characterized by a very soft power law (photon index of Γ = 4.0 ± 0.6). Although the redshift of PG 1553+113 is unknown, there are strong indications that it is greater than z = 0.25 and possibly larger than z = 0.78. The observed spectrum is interpreted in the context of VHE γ-ray absorption by the Extragalactic Background Light, and is used to place an upper limit on the redshift of z < 0.74.

langue originale	Anglais
Pages (de - à)	L19-L23
journal	Astronomy and Astrophysics
Volume	448
Numéro de publication	2
Les DOIs	https://doi.org/10.1051/0004-6361:200600010
état	Publié - 1 janv. 2006
Modification externe	Oui

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10.1051/0004-6361:200600010

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Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., Bernlöhr, K., Boisson, C., Bolz, O., Borrel, V., Braun, I., Breitling, F., Brown, A. M., Bühler, R., Carrigan, S., Chadwick, P. M., Chounet, L. M., Cornils, R., Costamante, L., ... Ward, M. (2006). Evidence for VHE γ-ray emission from the distant BL Lac PG 1553+113. Astronomy and Astrophysics, 448(2), L19-L23. https://doi.org/10.1051/0004-6361:200600010

@article{21bf9d5ca5d84bf8a07352c45627289b,

title = "Evidence for VHE γ-ray emission from the distant BL Lac PG 1553+113",

abstract = "The high-frequency peaked BL Lac PG 1553+113 was observed in 2005 with the HESS stereoscopic array of imaging atmospheric-Cherenkov telescopes in Namibia. Using the HESS standard analysis, an excess was measured at the 4.0σ level in these observations (7.6 hours live time). Three alternative, lower-threshold analyses yield >5σ excesses. The observed integral flux above 200 GeV is (4.8 ± 1.3stat ± 1.0syst) × 10 -12 cm-2 s-1, and shows no evidence for variability. The measured energy spectrum is characterized by a very soft power law (photon index of Γ = 4.0 ± 0.6). Although the redshift of PG 1553+113 is unknown, there are strong indications that it is greater than z = 0.25 and possibly larger than z = 0.78. The observed spectrum is interpreted in the context of VHE γ-ray absorption by the Extragalactic Background Light, and is used to place an upper limit on the redshift of z < 0.74.",

keywords = "Galaxies: active, Gamma rays: observations",

author = "F. Aharonian and Akhperjanian, \{A. G.\} and Bazer-Bachi, \{A. R.\} and M. Beilicke and W. Benbow and D. Berge and K. Bernl{\"o}hr and C. Boisson and O. Bolz and V. Borrel and I. Braun and F. Breitling and Brown, \{A. M.\} and R. B{\"u}hler and S. Carrigan and Chadwick, \{P. M.\} and Chounet, \{L. M.\} and R. Cornils and L. Costamante and B. Degrange and Dickinson, \{H. J.\} and A. Djannati-Ata{\"i} and Drury, \{L. O.C.\} and G. Dubus and K. Egberts and D. Emmanoulopoulos and P. Espigat and F. Feinstein and G. Fontaine and S. Funk and Gallant, \{Y. A.\} and B. Giebels and Glicenstein, \{J. F.\} and P. Goret and C. Hadjichristidis and D. Hauser 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 A. Jacholkowska 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 T. Lohse and Martin, \{J. M.\} and O. Martineau-Huynh and A. Marcowith and C. Masterson and McComb, \{T. J.L.\} and \{de Naurois\}, M. and D. Nedbal 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 Rayner, \{S. M.\} 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 D. Spangler and R. Steenkamp and C. Stegmann and G. Superina and Tavernet, \{J. P.\} and R. Terrier and Th{\'e}oret, \{C. G.\} and M. Tluczykont and \{van Eldik\}, C. and G. Vasileiadis and C. Venter and P. Vincent and V{\"o}lk, \{H. J.\} and Wagner, \{S. J.\} and M. Ward",

year = "2006",

month = jan,

day = "1",

doi = "10.1051/0004-6361:200600010",

language = "English",

volume = "448",

pages = "L19--L23",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

number = "2",

}

Aharonian, F, Akhperjanian, AG, Bazer-Bachi, AR, Beilicke, M, Benbow, W, Berge, D, Bernlöhr, K, Boisson, C, Bolz, O, Borrel, V, Braun, I, Breitling, F, Brown, AM, Bühler, R, Carrigan, S, Chadwick, PM, Chounet, LM, Cornils, R, Costamante, L, Degrange, B, Dickinson, HJ, Djannati-Ataï, A, Drury, LOC, Dubus, G, Egberts, K, Emmanoulopoulos, D, Espigat, P, Feinstein, F, Fontaine, G, Funk, S, Gallant, YA, Giebels, B, Glicenstein, JF, Goret, P, Hadjichristidis, C, Hauser, D, Hauser, M, Heinzelmann, G, Henri, G, Hermann, G, Hinton, JA, Hofmann, W, Holleran, M, Horns, D, Jacholkowska, A, de Jager, OC, Khélifi, B, Komin, N, Konopelko, A, Latham, IJ, le Gallou, R, Lemière, A, Lemoine-Goumard, M, Lohse, T, Martin, JM, Martineau-Huynh, O, Marcowith, A, Masterson, C, McComb, TJL, de Naurois, M, Nedbal, D, Nolan, SJ, Noutsos, A, Orford, KJ, Osborne, JL, Ouchrif, M, Panter, M, Pelletier, G, Pita, S, Pühlhofer, G, Punch, M, Raubenheimer, BC, Raue, M, Rayner, SM, 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, Spangler, D, Steenkamp, R, Stegmann, C, Superina, G, Tavernet, JP, Terrier, R, Théoret, CG, Tluczykont, M, van Eldik, C, Vasileiadis, G, Venter, C, Vincent, P, Völk, HJ, Wagner, SJ & Ward, M 2006, 'Evidence for VHE γ-ray emission from the distant BL Lac PG 1553+113', Astronomy and Astrophysics, VOL. 448, Numéro 2, p. L19-L23. https://doi.org/10.1051/0004-6361:200600010

TY - JOUR

T1 - Evidence for VHE γ-ray emission from the distant BL Lac PG 1553+113

AU - Aharonian, F.

AU - Akhperjanian, A. G.

AU - Bazer-Bachi, A. R.

AU - Beilicke, M.

AU - Benbow, W.

AU - Berge, D.

AU - Bernlöhr, K.

AU - Boisson, C.

AU - Bolz, O.

AU - Borrel, V.

AU - Braun, I.

AU - Breitling, F.

AU - Brown, A. M.

AU - Bühler, R.

AU - Carrigan, S.

AU - Chadwick, P. M.

AU - Chounet, L. M.

AU - Cornils, R.

AU - Costamante, L.

AU - Degrange, B.

AU - Dickinson, H. J.

AU - Djannati-Ataï, A.

AU - Drury, L. O.C.

AU - Dubus, G.

AU - Egberts, K.

AU - Emmanoulopoulos, D.

AU - Espigat, P.

AU - Feinstein, F.

AU - Fontaine, G.

AU - Funk, S.

AU - Gallant, Y. A.

AU - Giebels, B.

AU - Glicenstein, J. F.

AU - Goret, P.

AU - Hadjichristidis, C.

AU - Hauser, D.

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 - Jacholkowska, A.

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 - Lohse, T.

AU - Martin, J. M.

AU - Martineau-Huynh, O.

AU - Marcowith, A.

AU - Masterson, C.

AU - McComb, T. J.L.

AU - de Naurois, M.

AU - Nedbal, D.

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 - Rayner, S. M.

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 - Spangler, D.

AU - Steenkamp, R.

AU - Stegmann, C.

AU - Superina, G.

AU - Tavernet, J. P.

AU - Terrier, R.

AU - Théoret, C. G.

AU - Tluczykont, M.

AU - van Eldik, C.

AU - Vasileiadis, G.

AU - Venter, C.

AU - Vincent, P.

AU - Völk, H. J.

AU - Wagner, S. J.

AU - Ward, M.

PY - 2006/1/1

Y1 - 2006/1/1

N2 - The high-frequency peaked BL Lac PG 1553+113 was observed in 2005 with the HESS stereoscopic array of imaging atmospheric-Cherenkov telescopes in Namibia. Using the HESS standard analysis, an excess was measured at the 4.0σ level in these observations (7.6 hours live time). Three alternative, lower-threshold analyses yield >5σ excesses. The observed integral flux above 200 GeV is (4.8 ± 1.3stat ± 1.0syst) × 10 -12 cm-2 s-1, and shows no evidence for variability. The measured energy spectrum is characterized by a very soft power law (photon index of Γ = 4.0 ± 0.6). Although the redshift of PG 1553+113 is unknown, there are strong indications that it is greater than z = 0.25 and possibly larger than z = 0.78. The observed spectrum is interpreted in the context of VHE γ-ray absorption by the Extragalactic Background Light, and is used to place an upper limit on the redshift of z < 0.74.

AB - The high-frequency peaked BL Lac PG 1553+113 was observed in 2005 with the HESS stereoscopic array of imaging atmospheric-Cherenkov telescopes in Namibia. Using the HESS standard analysis, an excess was measured at the 4.0σ level in these observations (7.6 hours live time). Three alternative, lower-threshold analyses yield >5σ excesses. The observed integral flux above 200 GeV is (4.8 ± 1.3stat ± 1.0syst) × 10 -12 cm-2 s-1, and shows no evidence for variability. The measured energy spectrum is characterized by a very soft power law (photon index of Γ = 4.0 ± 0.6). Although the redshift of PG 1553+113 is unknown, there are strong indications that it is greater than z = 0.25 and possibly larger than z = 0.78. The observed spectrum is interpreted in the context of VHE γ-ray absorption by the Extragalactic Background Light, and is used to place an upper limit on the redshift of z < 0.74.

KW - Galaxies: active

KW - Gamma rays: observations

UR - https://www.scopus.com/pages/publications/33644940666

U2 - 10.1051/0004-6361:200600010

DO - 10.1051/0004-6361:200600010

M3 - Article

AN - SCOPUS:33644940666

SN - 0004-6361

VL - 448

SP - L19-L23

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 2

ER -

Evidence for VHE γ-ray emission from the distant BL Lac PG 1553+113

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