Abstract
We report the first detection of very high energy83Gamma-ray emission above 100 GeV. (VHE) gamma-ray emission above 140 GeV from PKS1424+240, a BL Lac object with an unknown redshift. The photon spectrum above 140 GeV measured by VERITAS is well described by a power law with a photon index of 3.8 0.5stat 0.3syst and a flux normalization at 200 GeV of (5.1 0.9stat 0.5syst) × 10-11 TeV -1 cm-2 s-1, where stat and syst denote the statistical and systematical uncertainties, respectively. The VHE flux is steady over the observation period between MJD 54881 and 55003 (from 2009 February 19 to June 21). Flux variability is also not observed in contemporaneous high-energy observations with the Fermi Large Area Telescope. Contemporaneous X-ray and optical data were also obtained from the Swift XRT and MDM observatory, respectively. The broadband spectral energy distribution is well described by a one-zone synchrotron self-Compton model favoring a redshift of less than 0.1. Using the photon index measured with Fermi in combination with recent extragalactic background light absorption models it can be concluded from the VERITAS data that the redshift of PKS 1424+240 is less than 0.66.
| Original language | English |
|---|---|
| Pages (from-to) | L100-L106 |
| Journal | Astrophysical Journal Letters |
| Volume | 708 |
| Issue number | 2 PART 2 |
| DOIs | |
| Publication status | Published - 2010 |
Keywords
- Gamma rays: observations
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
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Discovery of very high energy gamma rays from PKS 1424+240 and multiwavelength constraints on ITS redshift. / Acciari, V. A.; Aliu, E.; Arlen, T.; Aune, T.; Bautista, M.; Beilicke, M.; Benbow, W.; Böttcher, M.; Boltuch, D.; Bradbury, S. M.; Buckley, J. H.; Bugaev, V.; Byrum, K.; Cannon, A.; Cesarini, A.; Chow, Y. C.; Ciupik, L.; Cogan, P.; Cui, W.; Duke, C.; Falcone, A.; Finley, J. P.; Finnegan, G.; Fortson, L.; Furniss, A.; Galante, N.; Gall, D.; Gillanders, G. H.; Godambe, S.; Grube, J.; Guenette, R.; Gyuk, G.; Hanna, D.; Holder, J.; Hui, C. M.; Humensky, T. B.; Kaaret, P.; Karlsson, N.; Kertzman, M.; Kieda, D.; Konopelko, A.; Krawczynski, H.; Krennrich, F.; Lang, M. J.; Lebohec, S.; Maier, G.; McArthur, S.; McCann, A.; McCutcheon, M.; Millis, J.; Moriarty, P.; Nagai, T.; Ong, R. A.; Otte, A. N.; Pandel, D.; Perkins, J. S.; Pichel, A.; Pohl, M.; Quinn, J.; Ragan, K.; Reyes, L. C.; Reynolds, P. T.; Roache, E.; Rose, H. J.; Schroedter, M.; Sembroski, G. H.; Demet Senturk, G.; Smith, A. W.; Steele, D.; Swordy, S. P.; Theiling, M.; Thibadeau, S.; Varlotta, A.; Vassiliev, V. V.; Vincent, S.; Wagner, R. G.; Wakely, S. P.; Ward, J. E.; Weekes, T. C.; Weinstein, A.; Weisgarber, T.; Williams, D. A.; Wissel, S.; Wood, M.; Zitzer, B.; Abdo, A. A.; Ackermann, M.; Ajello, M.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Baughman, B. M.; Bechtol, K.; Bellazzini, R.; Berenji, B.; Blandford, R. D.; Bloom, E. D.; Bonamente, E.; Borgland, A. W.; Bregeon, J.; Brez, A.; Brigida, M.; Bruel, P.; Burnett, T. H.; Caliandro, G. A.; Cameron, R. A.; Caraveo, P. A.; Casandjian, J. M.; Cavazzuti, E.; Cecchi, C.; Çelik, Ö; Chekhtman, A.; Cheung, C. C.; Chiang, J.; Ciprini, S.; Claus, R.; Cohen-Tanugi, J.; Conrad, J.; Cutini, S.; Dermer, C. D.; De Angelis, A.; De Palma, F.; Do Couto E Silva, E.; Drell, P. S.; Drlica-Wagner, A.; Dubois, R.; Dumora, D.; Farnier, C.; Favuzzi, C.; Fegan, S. J.; Focke, W. B.; Fortin, P.; Frailis, M.; Fukazawa, Y.; Fusco, P.; Gargano, F.; Gasparrini, D.; Gehrels, N.; Germani, S.; Giebels, B.; Giglietto, N.; Giommi, P.; Giordano, F.; Glanzman, T.; Godfrey, G.; Grenier, I. A.; Grove, J. E.; Guillemot, L.; Guiriec, S.; Hanabata, Y.; Hays, E.; Hughes, R. E.; Jackson, M. S.; Jóhannesson, G.; Johnson, A. S.; Johnson, W. N.; Kamae, T.; Katagiri, H.; Kataoka, J.; Kawai, N.; Kerr, M.; Knödlseder, J.; Kocian, M. L.; Kuss, M.; Lande, J.; Latronico, L.; Longo, F.; Loparco, F.; Lott, B.; Lovellette, M. N.; Lubrano, P.; Madejski, G. M.; Makeev, A.; Mazziotta, M. N.; McEnery, J. E.; Meurer, C.; Michelson, P. F.; Mitthumsiri, W.; Mizuno, T.; Moiseev, A. A.; Monte, C.; Monzani, M. E.; Morselli, A.; Moskalenko, I. V.; Murgia, S.; Nolan, P. L.; Norris, J. P.; Nuss, E.; Ohsugi, T.; Omodei, N.; Orlando, E.; Ormes, J. F.; Paneque, D.; Parent, D.; Pelassa, V.; Pepe, M.; Pesce-Rollins, M.; Piron, F.; Porter, T. A.; Rainò, S.; Rando, R.; Razzano, M.; Reimer, A.; Reimer, O.; Reposeur, T.; Rodriguez, A. Y.; Roth, M.; Ryde, F.; Sadrozinski, H. F.W.; Sanchez, D.; Sander, A.; Saz Parkinson, P. M.; Scargle, J. D.; Sgrò, C.; Shaw, M. S.; Siskind, E. J.; Smith, P. D.; Spandre, G.; Spinelli, P.; Strickman, M. S.; Suson, D. J.; Tajima, H.; Takahashi, H.; Tanaka, T.; Thayer, J. B.; Thayer, J. G.; Thompson, D. J.; Tibaldo, L.; Torres, D. F.; Tosti, G.; Tramacere, A.; Uchiyama, Y.; Usher, T. L.; Vasileiou, V.; Vilchez, N.; Vitale, V.; Waite, A. P.; Wang, P.; Winer, B. L.; Wood, K. S.; Ylinen, T.; Ziegler, M.; Barber, S. D.; Terndrup, D. M.
In: Astrophysical Journal Letters, Vol. 708, No. 2 PART 2, 2010, p. L100-L106.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Discovery of very high energy gamma rays from PKS 1424+240 and multiwavelength constraints on ITS redshift
AU - Acciari, V. A.
AU - Aliu, E.
AU - Arlen, T.
AU - Aune, T.
AU - Bautista, M.
AU - Beilicke, M.
AU - Benbow, W.
AU - Böttcher, M.
AU - Boltuch, D.
AU - Bradbury, S. M.
AU - Buckley, J. H.
AU - Bugaev, V.
AU - Byrum, K.
AU - Cannon, A.
AU - Cesarini, A.
AU - Chow, Y. C.
AU - Ciupik, L.
AU - Cogan, P.
AU - Cui, W.
AU - Duke, C.
AU - Falcone, A.
AU - Finley, J. P.
AU - Finnegan, G.
AU - Fortson, L.
AU - Furniss, A.
AU - Galante, N.
AU - Gall, D.
AU - Gillanders, G. H.
AU - Godambe, S.
AU - Grube, J.
AU - Guenette, R.
AU - Gyuk, G.
AU - Hanna, D.
AU - Holder, J.
AU - Hui, C. M.
AU - Humensky, T. B.
AU - Kaaret, P.
AU - Karlsson, N.
AU - Kertzman, M.
AU - Kieda, D.
AU - Konopelko, A.
AU - Krawczynski, H.
AU - Krennrich, F.
AU - Lang, M. J.
AU - Lebohec, S.
AU - Maier, G.
AU - McArthur, S.
AU - McCann, A.
AU - McCutcheon, M.
AU - Millis, J.
AU - Moriarty, P.
AU - Nagai, T.
AU - Ong, R. A.
AU - Otte, A. N.
AU - Pandel, D.
AU - Perkins, J. S.
AU - Pichel, A.
AU - Pohl, M.
AU - Quinn, J.
AU - Ragan, K.
AU - Reyes, L. C.
AU - Reynolds, P. T.
AU - Roache, E.
AU - Rose, H. J.
AU - Schroedter, M.
AU - Sembroski, G. H.
AU - Demet Senturk, G.
AU - Smith, A. W.
AU - Steele, D.
AU - Swordy, S. P.
AU - Theiling, M.
AU - Thibadeau, S.
AU - Varlotta, A.
AU - Vassiliev, V. V.
AU - Vincent, S.
AU - Wagner, R. G.
AU - Wakely, S. P.
AU - Ward, J. E.
AU - Weekes, T. C.
AU - Weinstein, A.
AU - Weisgarber, T.
AU - Williams, D. A.
AU - Wissel, S.
AU - Wood, M.
AU - Zitzer, B.
AU - Abdo, A. A.
AU - Ackermann, M.
AU - Ajello, M.
AU - Baldini, L.
AU - Ballet, J.
AU - Barbiellini, G.
AU - Bastieri, D.
AU - Baughman, B. M.
AU - Bechtol, K.
AU - Bellazzini, R.
AU - Berenji, B.
AU - Blandford, R. D.
AU - Bloom, E. D.
AU - Bonamente, E.
AU - Borgland, A. W.
AU - Bregeon, J.
AU - Brez, A.
AU - Brigida, M.
AU - Bruel, P.
AU - Burnett, T. H.
AU - Caliandro, G. A.
AU - Cameron, R. A.
AU - Caraveo, P. A.
AU - Casandjian, J. M.
AU - Cavazzuti, E.
AU - Cecchi, C.
AU - Çelik, Ö
AU - Chekhtman, A.
AU - Cheung, C. C.
AU - Chiang, J.
AU - Ciprini, S.
AU - Claus, R.
AU - Cohen-Tanugi, J.
AU - Conrad, J.
AU - Cutini, S.
AU - Dermer, C. D.
AU - De Angelis, A.
AU - De Palma, F.
AU - Do Couto E Silva, E.
AU - Drell, P. S.
AU - Drlica-Wagner, A.
AU - Dubois, R.
AU - Dumora, D.
AU - Farnier, C.
AU - Favuzzi, C.
AU - Fegan, S. J.
AU - Focke, W. B.
AU - Fortin, P.
AU - Frailis, M.
AU - Fukazawa, Y.
AU - Fusco, P.
AU - Gargano, F.
AU - Gasparrini, D.
AU - Gehrels, N.
AU - Germani, S.
AU - Giebels, B.
AU - Giglietto, N.
AU - Giommi, P.
AU - Giordano, F.
AU - Glanzman, T.
AU - Godfrey, G.
AU - Grenier, I. A.
AU - Grove, J. E.
AU - Guillemot, L.
AU - Guiriec, S.
AU - Hanabata, Y.
AU - Hays, E.
AU - Hughes, R. E.
AU - Jackson, M. S.
AU - Jóhannesson, G.
AU - Johnson, A. S.
AU - Johnson, W. N.
AU - Kamae, T.
AU - Katagiri, H.
AU - Kataoka, J.
AU - Kawai, N.
AU - Kerr, M.
AU - Knödlseder, J.
AU - Kocian, M. L.
AU - Kuss, M.
AU - Lande, J.
AU - Latronico, L.
AU - Longo, F.
AU - Loparco, F.
AU - Lott, B.
AU - Lovellette, M. N.
AU - Lubrano, P.
AU - Madejski, G. M.
AU - Makeev, A.
AU - Mazziotta, M. N.
AU - McEnery, J. E.
AU - Meurer, C.
AU - Michelson, P. F.
AU - Mitthumsiri, W.
AU - Mizuno, T.
AU - Moiseev, A. A.
AU - Monte, C.
AU - Monzani, M. E.
AU - Morselli, A.
AU - Moskalenko, I. V.
AU - Murgia, S.
AU - Nolan, P. L.
AU - Norris, J. P.
AU - Nuss, E.
AU - Ohsugi, T.
AU - Omodei, N.
AU - Orlando, E.
AU - Ormes, J. F.
AU - Paneque, D.
AU - Parent, D.
AU - Pelassa, V.
AU - Pepe, M.
AU - Pesce-Rollins, M.
AU - Piron, F.
AU - Porter, T. A.
AU - Rainò, S.
AU - Rando, R.
AU - Razzano, M.
AU - Reimer, A.
AU - Reimer, O.
AU - Reposeur, T.
AU - Rodriguez, A. Y.
AU - Roth, M.
AU - Ryde, F.
AU - Sadrozinski, H. F.W.
AU - Sanchez, D.
AU - Sander, A.
AU - Saz Parkinson, P. M.
AU - Scargle, J. D.
AU - Sgrò, C.
AU - Shaw, M. S.
AU - Siskind, E. J.
AU - Smith, P. D.
AU - Spandre, G.
AU - Spinelli, P.
AU - Strickman, M. S.
AU - Suson, D. J.
AU - Tajima, H.
AU - Takahashi, H.
AU - Tanaka, T.
AU - Thayer, J. B.
AU - Thayer, J. G.
AU - Thompson, D. J.
AU - Tibaldo, L.
AU - Torres, D. F.
AU - Tosti, G.
AU - Tramacere, A.
AU - Uchiyama, Y.
AU - Usher, T. L.
AU - Vasileiou, V.
AU - Vilchez, N.
AU - Vitale, V.
AU - Waite, A. P.
AU - Wang, P.
AU - Winer, B. L.
AU - Wood, K. S.
AU - Ylinen, T.
AU - Ziegler, M.
AU - Barber, S. D.
AU - Terndrup, D. M.
PY - 2010
Y1 - 2010
N2 - We report the first detection of very high energy83Gamma-ray emission above 100 GeV. (VHE) gamma-ray emission above 140 GeV from PKS1424+240, a BL Lac object with an unknown redshift. The photon spectrum above 140 GeV measured by VERITAS is well described by a power law with a photon index of 3.8 0.5stat 0.3syst and a flux normalization at 200 GeV of (5.1 0.9stat 0.5syst) × 10-11 TeV -1 cm-2 s-1, where stat and syst denote the statistical and systematical uncertainties, respectively. The VHE flux is steady over the observation period between MJD 54881 and 55003 (from 2009 February 19 to June 21). Flux variability is also not observed in contemporaneous high-energy observations with the Fermi Large Area Telescope. Contemporaneous X-ray and optical data were also obtained from the Swift XRT and MDM observatory, respectively. The broadband spectral energy distribution is well described by a one-zone synchrotron self-Compton model favoring a redshift of less than 0.1. Using the photon index measured with Fermi in combination with recent extragalactic background light absorption models it can be concluded from the VERITAS data that the redshift of PKS 1424+240 is less than 0.66.
AB - We report the first detection of very high energy83Gamma-ray emission above 100 GeV. (VHE) gamma-ray emission above 140 GeV from PKS1424+240, a BL Lac object with an unknown redshift. The photon spectrum above 140 GeV measured by VERITAS is well described by a power law with a photon index of 3.8 0.5stat 0.3syst and a flux normalization at 200 GeV of (5.1 0.9stat 0.5syst) × 10-11 TeV -1 cm-2 s-1, where stat and syst denote the statistical and systematical uncertainties, respectively. The VHE flux is steady over the observation period between MJD 54881 and 55003 (from 2009 February 19 to June 21). Flux variability is also not observed in contemporaneous high-energy observations with the Fermi Large Area Telescope. Contemporaneous X-ray and optical data were also obtained from the Swift XRT and MDM observatory, respectively. The broadband spectral energy distribution is well described by a one-zone synchrotron self-Compton model favoring a redshift of less than 0.1. Using the photon index measured with Fermi in combination with recent extragalactic background light absorption models it can be concluded from the VERITAS data that the redshift of PKS 1424+240 is less than 0.66.
KW - Gamma rays: observations
UR - http://www.scopus.com/inward/record.url?scp=77949547554&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77949547554&partnerID=8YFLogxK
U2 - 10.1088/2041-8205/708/2/L100
DO - 10.1088/2041-8205/708/2/L100
M3 - Article
AN - SCOPUS:77949547554
VL - 708
SP - L100-L106
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
SN - 2041-8205
IS - 2 PART 2
ER -