The high-energy γ-ray emission of AP Librae

A. Abramowski; F. Aharonian; F. Ait Benkhali; A. G. Akhperjanian; E. Angüner; G. Anton; M. Backes; S. Balenderan; A. Balzer; A. Barnacka; Y. Becherini; J. Becker Tjus; K. Bernlöhr; E. Birsin; E. Bissaldi; J. Biteau; M. Böttcher; C. Boisson; J. Bolmont; P. Bordas; J. Brucker; F. Brun; P. Brun; T. Bulik; S. Carrigan; S. Casanova; P. M. Chadwick; R. Chalme-Calvet; R. C G Chaves; A. Cheesebrough; M. Chrétien; S. Colafrancesco; G. Cologna; J. Conrad; C. Couturier; Y. Cui; M. Dalton; M. K. Daniel; I. D. Davids; B. Degrange; C. Deil; P. Dewilt; H. J. Dickinson; A. Djannati-Ataï; W. Domainko; L. O c Drury; G. Dubus; K. Dutson; J. Dyks; M. Dyrda; T. Edwards; K. Egberts; P. Eger; P. Espigat; C. Farnier; S. Fegan; F. Feinstein; M. V. Fernandes; D. Fernandez; A. Fiasson; G. Fontaine; A. Förster; M. Füßling; M. Gajdus; Y. A. Gallant; T. Garrigoux; G. Giavitto; B. Giebels; J. F. Glicenstein; M. H. Grondin; M. Grudzińska; S. Häffner; J. Hahn; J. Harris; G. Heinzelmann; G. Henri; G. Hermann; O. Hervet; A. Hillert; J. A. Hinton; W. Hofmann; P. Hofverberg; M. Holler; D. Horns; A. Jacholkowska; C. Jahn; M. Jamrozy; M. Janiak; F. Jankowsky; I. Jung; M. A. Kastendieck; K. Katarzyński; U. Katz; S. Kaufmann; B. Khélifi; M. Kieffer; S. Klepser; D. Klochkov; W. Kluźniak; T. Kneiske; D. Kolitzus; Nu Komin; K. Kosack; S. Krakau; F. Krayzel; P. P. Krüger; H. Laffon; G. Lamanna; J. Lefaucheur; A. Lemière; M. Lemoine-Goumard; J. P. Lenain; T. Lohse; A. Lopatin; C. C. Lu; V. Marandon; A. Marcowith; R. Marx; G. Maurin; N. Maxted; M. Mayer; T. J L Mccomb; J. Méhault; P. J. Meintjes; U. Menzler; M. Meyer; R. Moderski; M. Mohamed; E. Moulin; T. Murach; C. L. Naumann; M. De Naurois; J. Niemiec; S. J. Nolan; L. Oakes; H. Odaka; 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; J. Perez; P. O. Petrucci; B. Peyaud; S. Pita; H. Poon; G. Pühlhofer; M. Punch; A. Quirrenbach; S. Raab; M. Raue; I. Reichardt; A. Reimer; O. Reimer; M. Renaud; R. De Los Reyes; F. Rieger; L. Rob; C. Romoli; S. Rosier-Lees; G. Rowell; B. Rudak; C. B. Rulten; V. Sahakian; D. A. Sanchez; A. Santangelo; R. Schlickeiser; F. Schüssler; A. Schulz; U. Schwanke; S. Schwarzburg; S. Schwemmer; H. Sol; G. Spengler; F. Spies; 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; C. Van Eldik; B. Van Soelen; G. Vasileiadis; C. Venter; A. Viana; P. Vincent; H. J. Völk; F. Volpe; M. Vorster; T. Vuillaume; S. J. Wagner; P. Wagner; R. M. Wagner; M. Ward; M. Weidinger; Q. Weitzel; R. White; A. Wierzcholska; P. Willmann; A. Wörnlein; D. Wouters; R. Yang; V. Zabalza; M. Zacharias; A. A. Zdziarski; A. Zech; H. S. Zechlin; J. Finke; P. Fortin; D. Horan

doi:10.1051/0004-6361/201321436

The high-energy γ-ray emission of AP Librae

A. Abramowski
, F. Aharonian
, F. Ait Benkhali
, A. G. Akhperjanian
, E. Angüner
, G. Anton
, M. Backes
, S. Balenderan
, A. Balzer
, A. Barnacka
, Y. Becherini
, J. Becker Tjus
, K. Bernlöhr
, E. Birsin
, E. Bissaldi
, J. Biteau
, M. Böttcher
, C. Boisson
, J. Bolmont
, P. Bordas

J. Brucker, F. Brun, P. Brun, T. Bulik, S. Carrigan, S. Casanova, P. M. Chadwick, R. Chalme-Calvet, R. C G Chaves, A. Cheesebrough, M. Chrétien, S. Colafrancesco, G. Cologna, J. Conrad, C. Couturier, Y. Cui, M. Dalton, M. K. Daniel, I. D. Davids, B. Degrange, C. Deil, P. Dewilt, H. J. Dickinson, A. Djannati-Ataï, W. Domainko, L. O c Drury, G. Dubus, K. Dutson, J. Dyks, M. Dyrda, T. Edwards, K. Egberts, P. Eger, P. Espigat, C. Farnier, S. Fegan, F. Feinstein, M. V. Fernandes, D. Fernandez, A. Fiasson, G. Fontaine, A. Förster, M. Füßling, M. Gajdus, Y. A. Gallant, T. Garrigoux, G. Giavitto, B. Giebels, J. F. Glicenstein, M. H. Grondin, M. Grudzińska, S. Häffner, J. Hahn, J. Harris, G. Heinzelmann, G. Henri, G. Hermann, O. Hervet, A. Hillert, J. A. Hinton, W. Hofmann, P. Hofverberg, M. Holler, D. Horns, A. Jacholkowska, C. Jahn, M. Jamrozy, M. Janiak, F. Jankowsky, I. Jung, M. A. Kastendieck, K. Katarzyński, U. Katz, S. Kaufmann, B. Khélifi, M. Kieffer, S. Klepser, D. Klochkov, W. Kluźniak, T. Kneiske, D. Kolitzus, Nu Komin, K. Kosack, S. Krakau, F. Krayzel, P. P. Krüger, H. Laffon, G. Lamanna, J. Lefaucheur, A. Lemière, M. Lemoine-Goumard, J. P. Lenain, T. Lohse, A. Lopatin, C. C. Lu, V. Marandon, A. Marcowith, R. Marx, G. Maurin, N. Maxted, M. Mayer, T. J L Mccomb, J. Méhault, P. J. Meintjes, U. Menzler, M. Meyer, R. Moderski, M. Mohamed, E. Moulin, T. Murach, C. L. Naumann, M. De Naurois, J. Niemiec, S. J. Nolan, L. Oakes, H. Odaka, 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, J. Perez, P. O. Petrucci, B. Peyaud, S. Pita, H. Poon, G. Pühlhofer, M. Punch, A. Quirrenbach, S. Raab, M. Raue, I. Reichardt, A. Reimer, O. Reimer, M. Renaud, R. De Los Reyes, F. Rieger, L. Rob, C. Romoli, S. Rosier-Lees, G. Rowell, B. Rudak, C. B. Rulten, V. Sahakian, D. A. Sanchez, A. Santangelo, R. Schlickeiser, F. Schüssler, A. Schulz, U. Schwanke, S. Schwarzburg, S. Schwemmer, H. Sol, G. Spengler, F. Spies, 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, C. Van Eldik, B. Van Soelen, G. Vasileiadis, C. Venter, A. Viana, P. Vincent, H. J. Völk, F. Volpe, M. Vorster, T. Vuillaume, S. J. Wagner, P. Wagner, R. M. Wagner, M. Ward, M. Weidinger, Q. Weitzel, R. White, A. Wierzcholska, P. Willmann, A. Wörnlein, D. Wouters, R. Yang, V. Zabalza, M. Zacharias, A. A. Zdziarski, A. Zech, H. S. Zechlin, J. Finke, P. Fortin, D. Horan

Physics and Astronomy (Twin Cities)

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

17 Scopus citations

Abstract

The γ-ray spectrum of the low-frequency-peaked BL Lac (LBL) object AP Librae is studied, following the discovery of very-high-energy (VHE; E > 100 GeV) γ-ray emission up to the TeV range by the H.E.S.S. experiment. This makes AP Librae one of the few VHE emitters of the LBL type. The measured spectrum yields a flux of (8.8 ± 1.5_stat ± 1.8_sys) × 10^-12 cm^-2 s^-1 above 130 GeV and a spectral index of Γ = 2.65 ± 0.19_stat ± 0.20_sys. This study also makes use of Fermi-LAT observations in the high energy (HE, E> 100 MeV) range, providing the longest continuous light curve (5 years) ever published on this source. The source underwent a flaring event between MJD 56 306-56 376 in the HE range, with a flux increase of a factor of 3.5 in the 14 day bin light curve and no significant variation in spectral shape with respect to the low-flux state. While the H.E.S.S. and (low state) Fermi-LAT fluxes are in good agreement where they overlap, a spectral curvature between the steep VHE spectrum and the Fermi-LAT spectrum is observed. The maximum of the γ-ray emission in the spectral energy distribution is located below the GeV energy range.

Original language	English (US)
Article number	A31
Journal	Astronomy and Astrophysics
Volume	573
DOIs	https://doi.org/10.1051/0004-6361/201321436
State	Published - Jan 1 2015

Bibliographical note

Publisher Copyright:
© ESO, 2014.

Keywords

BL Lacertae objects: individual: AP Librae
Galaxies: active
Gamma rays: galaxies

Publisher link

10.1051/0004-6361/201321436

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Abramowski, A., Aharonian, F., Ait Benkhali, F., Akhperjanian, A. G., Angüner, E., Anton, G., Backes, M., Balenderan, S., Balzer, A., Barnacka, A., Becherini, Y., Becker Tjus, J., Bernlöhr, K., Birsin, E., Bissaldi, E., Biteau, J., Böttcher, M., Boisson, C., Bolmont, J., ... Horan, D. (2015). The high-energy γ-ray emission of AP Librae. Astronomy and Astrophysics, 573, Article A31. https://doi.org/10.1051/0004-6361/201321436

Abramowski, A, Aharonian, F, Ait Benkhali, F, Akhperjanian, AG, Angüner, E, Anton, G, Backes, M, Balenderan, S, Balzer, A, Barnacka, A, Becherini, Y, Becker Tjus, J, Bernlöhr, K, Birsin, E, Bissaldi, E, Biteau, J, Böttcher, M, Boisson, C, Bolmont, J, Bordas, P, Brucker, J, Brun, F, Brun, P, Bulik, T, Carrigan, S, Casanova, S, Chadwick, PM, Chalme-Calvet, R, Chaves, RCG, Cheesebrough, A, Chrétien, M, Colafrancesco, S, Cologna, G, Conrad, J, Couturier, C, Cui, Y, Dalton, M, Daniel, MK, Davids, ID, Degrange, B, Deil, C, Dewilt, P, Dickinson, HJ, Djannati-Ataï, A, Domainko, W, Drury, LOC, Dubus, G, Dutson, K, Dyks, J, Dyrda, M, Edwards, T, Egberts, K, Eger, P, Espigat, P, Farnier, C, Fegan, S, Feinstein, F, Fernandes, MV, Fernandez, D, Fiasson, A, Fontaine, G, Förster, A, Füßling, M, Gajdus, M, Gallant, YA, Garrigoux, T, Giavitto, G, Giebels, B, Glicenstein, JF, Grondin, MH, Grudzińska, M, Häffner, S, Hahn, J, Harris, J, Heinzelmann, G, Henri, G, Hermann, G, Hervet, O, Hillert, A, Hinton, JA, Hofmann, W, Hofverberg, P, Holler, M, Horns, D, Jacholkowska, A, Jahn, C, Jamrozy, M, Janiak, M, Jankowsky, F, Jung, I, Kastendieck, MA, Katarzyński, K, Katz, U, Kaufmann, S, Khélifi, B, Kieffer, M, Klepser, S, Klochkov, D, Kluźniak, W, Kneiske, T, Kolitzus, D, Komin, N, Kosack, K, Krakau, S, Krayzel, F, Krüger, PP, Laffon, H, Lamanna, G, Lefaucheur, J, Lemière, A, Lemoine-Goumard, M, Lenain, JP, Lohse, T, Lopatin, A, Lu, CC, Marandon, V, Marcowith, A, Marx, R, Maurin, G, Maxted, N, Mayer, M, Mccomb, TJL, Méhault, J, Meintjes, PJ, Menzler, U, Meyer, M, Moderski, R, Mohamed, M, Moulin, E, Murach, T, Naumann, CL, De Naurois, M, Niemiec, J, Nolan, SJ, Oakes, L, Odaka, H, Ohm, S, De Oña Wilhelmi, E, Opitz, B, Ostrowski, M, Oya, I, Panter, M, Parsons, RD, Paz Arribas, M, Pekeur, NW, Pelletier, G, Perez, J, Petrucci, PO, Peyaud, B, Pita, S, Poon, H, Pühlhofer, G, Punch, M, Quirrenbach, A, Raab, S, Raue, M, Reichardt, I, Reimer, A, Reimer, O, Renaud, M, De Los Reyes, R, Rieger, F, Rob, L, Romoli, C, Rosier-Lees, S, Rowell, G, Rudak, B, Rulten, CB, Sahakian, V, Sanchez, DA, Santangelo, A, Schlickeiser, R, Schüssler, F, Schulz, A, Schwanke, U, Schwarzburg, S, Schwemmer, S, Sol, H, Spengler, G, Spies, F, Stawarz, 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 Eldik, C, Van Soelen, B, Vasileiadis, G, Venter, C, Viana, A, Vincent, P, Völk, HJ, Volpe, F, Vorster, M, Vuillaume, T, Wagner, SJ, Wagner, P, Wagner, RM, Ward, M, Weidinger, M, Weitzel, Q, White, R, Wierzcholska, A, Willmann, P, Wörnlein, A, Wouters, D, Yang, R, Zabalza, V, Zacharias, M, Zdziarski, AA, Zech, A, Zechlin, HS, Finke, J, Fortin, P & Horan, D 2015, 'The high-energy γ-ray emission of AP Librae', Astronomy and Astrophysics, vol. 573, A31. https://doi.org/10.1051/0004-6361/201321436

@article{dcc6f355ba9448aeae6bc150555fdad0,

title = "The high-energy γ-ray emission of AP Librae",

abstract = "The γ-ray spectrum of the low-frequency-peaked BL Lac (LBL) object AP Librae is studied, following the discovery of very-high-energy (VHE; E > 100 GeV) γ-ray emission up to the TeV range by the H.E.S.S. experiment. This makes AP Librae one of the few VHE emitters of the LBL type. The measured spectrum yields a flux of (8.8 ± 1.5stat ± 1.8sys) × 10-12 cm-2 s-1 above 130 GeV and a spectral index of Γ = 2.65 ± 0.19stat ± 0.20sys. This study also makes use of Fermi-LAT observations in the high energy (HE, E> 100 MeV) range, providing the longest continuous light curve (5 years) ever published on this source. The source underwent a flaring event between MJD 56 306-56 376 in the HE range, with a flux increase of a factor of 3.5 in the 14 day bin light curve and no significant variation in spectral shape with respect to the low-flux state. While the H.E.S.S. and (low state) Fermi-LAT fluxes are in good agreement where they overlap, a spectral curvature between the steep VHE spectrum and the Fermi-LAT spectrum is observed. The maximum of the γ-ray emission in the spectral energy distribution is located below the GeV energy range.",

keywords = "BL Lacertae objects: individual: AP Librae, Galaxies: active, Gamma rays: galaxies",

author = "A. Abramowski and F. Aharonian and \{Ait Benkhali\}, F. and Akhperjanian, \{A. G.\} and E. Ang{\"u}ner and G. Anton and M. Backes and S. Balenderan and A. Balzer and A. Barnacka and Y. Becherini and \{Becker Tjus\}, J. and K. Bernl{\"o}hr and E. Birsin and E. Bissaldi and J. Biteau and M. B{\"o}ttcher and C. Boisson and J. Bolmont and P. Bordas and J. Brucker and F. Brun and P. Brun and T. Bulik and S. Carrigan and S. Casanova and Chadwick, \{P. M.\} and R. Chalme-Calvet and Chaves, \{R. C G\} and A. Cheesebrough and M. Chr{\'e}tien and S. Colafrancesco and G. Cologna and J. Conrad and C. Couturier and Y. Cui and M. Dalton and Daniel, \{M. K.\} and Davids, \{I. D.\} and B. Degrange and C. Deil and P. Dewilt and Dickinson, \{H. J.\} and A. Djannati-Ata{\"i} and W. Domainko 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 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 M. Gajdus and Gallant, \{Y. A.\} and T. Garrigoux and G. Giavitto and B. Giebels and Glicenstein, \{J. F.\} and Grondin, \{M. H.\} and M. Grudzi{\'n}ska and S. H{\"a}ffner and J. Hahn and J. Harris 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 M. Holler and D. Horns and A. Jacholkowska and C. Jahn and M. Jamrozy and M. Janiak and F. Jankowsky and I. Jung and Kastendieck, \{M. A.\} and K. Katarzy{\'n}ski and U. Katz and S. Kaufmann and B. Kh{\'e}lifi and M. Kieffer and S. Klepser and D. Klochkov and W. Klu{\'z}niak and T. Kneiske 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. Lefaucheur and A. Lemi{\`e}re and M. Lemoine-Goumard and Lenain, \{J. P.\} and T. Lohse and A. Lopatin and Lu, \{C. C.\} and V. Marandon and A. Marcowith and R. Marx and G. Maurin and N. Maxted and M. Mayer and Mccomb, \{T. J L\} and J. M{\'e}hault and Meintjes, \{P. J.\} and U. Menzler and M. Meyer and R. Moderski and M. Mohamed and E. Moulin and T. Murach and Naumann, \{C. L.\} and \{De Naurois\}, M. and J. Niemiec and Nolan, \{S. J.\} and L. Oakes and H. Odaka 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 J. Perez and Petrucci, \{P. O.\} and B. Peyaud and S. Pita and H. Poon and G. P{\"u}hlhofer and M. Punch and A. Quirrenbach and S. Raab and M. Raue and I. Reichardt and A. Reimer and O. Reimer and M. Renaud and \{De Los Reyes\}, R. and F. Rieger and L. Rob and C. Romoli and S. Rosier-Lees and G. Rowell and B. Rudak and Rulten, \{C. B.\} and V. Sahakian and Sanchez, \{D. A.\} and A. Santangelo and R. Schlickeiser and F. Sch{\"u}ssler and A. Schulz and U. Schwanke and S. Schwarzburg and S. Schwemmer and H. Sol and G. Spengler and F. Spies and Stawarz 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 Eldik\}, C. and \{Van Soelen\}, B. and G. Vasileiadis and C. Venter and A. Viana and P. Vincent and V{\"o}lk, \{H. J.\} and F. Volpe and M. Vorster and T. Vuillaume and Wagner, \{S. J.\} and P. Wagner and Wagner, \{R. M.\} and M. Ward 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 M. Zacharias and Zdziarski, \{A. A.\} and A. Zech and Zechlin, \{H. S.\} and J. Finke and P. Fortin and D. Horan",

note = "Publisher Copyright: {\textcopyright} ESO, 2014.",

year = "2015",

month = jan,

day = "1",

doi = "10.1051/0004-6361/201321436",

language = "English (US)",

volume = "573",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

TY - JOUR

T1 - The high-energy γ-ray emission of AP Librae

AU - Abramowski, A.

AU - Aharonian, F.

AU - Ait Benkhali, F.

AU - Akhperjanian, A. G.

AU - Angüner, E.

AU - Anton, G.

AU - Backes, M.

AU - Balenderan, S.

AU - Balzer, A.

AU - Barnacka, A.

AU - Becherini, Y.

AU - Becker Tjus, J.

AU - Bernlöhr, K.

AU - Birsin, E.

AU - Bissaldi, E.

AU - Biteau, J.

AU - Böttcher, M.

AU - Boisson, C.

AU - Bolmont, J.

AU - Bordas, P.

AU - Brucker, J.

AU - Brun, F.

AU - Brun, P.

AU - Bulik, T.

AU - Carrigan, S.

AU - Casanova, S.

AU - Chadwick, P. M.

AU - Chalme-Calvet, R.

AU - Chaves, R. C G

AU - Cheesebrough, A.

AU - Chrétien, M.

AU - Colafrancesco, S.

AU - Cologna, G.

AU - Conrad, J.

AU - Couturier, C.

AU - Cui, Y.

AU - Dalton, M.

AU - Daniel, M. K.

AU - Davids, I. D.

AU - Degrange, B.

AU - Deil, C.

AU - Dewilt, P.

AU - Dickinson, H. J.

AU - Djannati-Ataï, A.

AU - Domainko, W.

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 - 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 - Gajdus, M.

AU - Gallant, Y. A.

AU - Garrigoux, T.

AU - Giavitto, G.

AU - Giebels, B.

AU - Glicenstein, J. F.

AU - Grondin, M. H.

AU - Grudzińska, M.

AU - Häffner, S.

AU - Hahn, J.

AU - Harris, 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 - Holler, M.

AU - Horns, D.

AU - Jacholkowska, A.

AU - Jahn, C.

AU - Jamrozy, M.

AU - Janiak, M.

AU - Jankowsky, F.

AU - Jung, I.

AU - Kastendieck, M. A.

AU - Katarzyński, K.

AU - Katz, U.

AU - Kaufmann, S.

AU - Khélifi, B.

AU - Kieffer, M.

AU - Klepser, S.

AU - Klochkov, D.

AU - Kluźniak, W.

AU - Kneiske, T.

AU - Kolitzus, D.

AU - Komin, Nu

AU - Kosack, K.

AU - Krakau, S.

AU - Krayzel, F.

AU - Krüger, P. P.

AU - Laffon, H.

AU - Lamanna, G.

AU - Lefaucheur, J.

AU - Lemière, A.

AU - Lemoine-Goumard, M.

AU - Lenain, J. P.

AU - Lohse, T.

AU - Lopatin, A.

AU - Lu, C. C.

AU - Marandon, V.

AU - Marcowith, A.

AU - Marx, R.

AU - Maurin, G.

AU - Maxted, N.

AU - Mayer, M.

AU - Mccomb, T. J L

AU - Méhault, J.

AU - Meintjes, P. J.

AU - Menzler, U.

AU - Meyer, M.

AU - Moderski, R.

AU - Mohamed, M.

AU - Moulin, E.

AU - Murach, T.

AU - Naumann, C. L.

AU - De Naurois, M.

AU - Niemiec, J.

AU - Nolan, S. J.

AU - Oakes, L.

AU - Odaka, H.

AU - Ohm, S.

AU - De Oña Wilhelmi, E.

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PY - 2015/1/1

Y1 - 2015/1/1

N2 - The γ-ray spectrum of the low-frequency-peaked BL Lac (LBL) object AP Librae is studied, following the discovery of very-high-energy (VHE; E > 100 GeV) γ-ray emission up to the TeV range by the H.E.S.S. experiment. This makes AP Librae one of the few VHE emitters of the LBL type. The measured spectrum yields a flux of (8.8 ± 1.5stat ± 1.8sys) × 10-12 cm-2 s-1 above 130 GeV and a spectral index of Γ = 2.65 ± 0.19stat ± 0.20sys. This study also makes use of Fermi-LAT observations in the high energy (HE, E> 100 MeV) range, providing the longest continuous light curve (5 years) ever published on this source. The source underwent a flaring event between MJD 56 306-56 376 in the HE range, with a flux increase of a factor of 3.5 in the 14 day bin light curve and no significant variation in spectral shape with respect to the low-flux state. While the H.E.S.S. and (low state) Fermi-LAT fluxes are in good agreement where they overlap, a spectral curvature between the steep VHE spectrum and the Fermi-LAT spectrum is observed. The maximum of the γ-ray emission in the spectral energy distribution is located below the GeV energy range.

AB - The γ-ray spectrum of the low-frequency-peaked BL Lac (LBL) object AP Librae is studied, following the discovery of very-high-energy (VHE; E > 100 GeV) γ-ray emission up to the TeV range by the H.E.S.S. experiment. This makes AP Librae one of the few VHE emitters of the LBL type. The measured spectrum yields a flux of (8.8 ± 1.5stat ± 1.8sys) × 10-12 cm-2 s-1 above 130 GeV and a spectral index of Γ = 2.65 ± 0.19stat ± 0.20sys. This study also makes use of Fermi-LAT observations in the high energy (HE, E> 100 MeV) range, providing the longest continuous light curve (5 years) ever published on this source. The source underwent a flaring event between MJD 56 306-56 376 in the HE range, with a flux increase of a factor of 3.5 in the 14 day bin light curve and no significant variation in spectral shape with respect to the low-flux state. While the H.E.S.S. and (low state) Fermi-LAT fluxes are in good agreement where they overlap, a spectral curvature between the steep VHE spectrum and the Fermi-LAT spectrum is observed. The maximum of the γ-ray emission in the spectral energy distribution is located below the GeV energy range.

KW - BL Lacertae objects: individual: AP Librae

KW - Galaxies: active

KW - Gamma rays: galaxies

UR - https://www.scopus.com/pages/publications/84936998181

UR - https://www.scopus.com/pages/publications/84936998181#tab=citedBy

U2 - 10.1051/0004-6361/201321436

DO - 10.1051/0004-6361/201321436

M3 - Article

AN - SCOPUS:84936998181

SN - 0004-6361

VL - 573

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A31

ER -

The high-energy γ-ray emission of AP Librae

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