Discovery of very high energy gamma rays from PKS 1424+240 and multiwavelength constraints on its redshift

V. A Acciari; E Aliu; T Arlen; T Aune; M Bautista; M Beilicke; W Benbow; M Böttcher; D Boltuch; S. M Bradbury; J. H Buckley; A Cesarini; T Tanaka; W Cui; C Duke; A Falcone; L Ciupik; W. N Johnson; J. P Finley; G Finnegan; L Fortson; A Furniss; J Holder; N Galante; C. M Hui; T. B Humensky; Philip E Kaaret; N Karlsson; G. H Gillanders; D Kieda; G Gyuk; R Guenette; S Godambe; M Kertzman; J Grube; A Konopelko; D Hanna; H Krawczynski; F Krennrich; S LeBohec; G Maier; S McArthur; A McCann; M McCutcheon; J Millis; P Moriarty; T Nagai; R. A Ong; A. N Otte; D Pandel; J. S Perkins; A Pichel; M Pohl; J Quinn; K Ragan; L. C Reyes; P. T Reynolds; E Roache; H. J Rose; M Schroedter; G. H Sembroski; G Demet Senturk; D Steele; S. P Swordy; M Theiling; S Thibadeau; A Varlotta; V. V Vassiliev; R. G Wagner; S. P Wakely; J. E Ward; T. C Weekes; D Gall; A Weinstein; M. J Lang; T Weisgarber; D. A Williams; S Wissel; A. W Smith; M Wood; B Zitzer; D. J Thompson; A. A Abdo; S Vincent; M Ackermann; V Bugaev; M Ajello; L Baldini; K Byrum; J Ballet; A. S Johnson; G Barbiellini; Y. C Chow; D Bastieri; A Cannon; B. M Baughman; K Bechtol; F Longo; R Bellazzini; P Cogan; B Berenji; R. D Blandford; E. D Bloom; E Bonamente; A. W Borgland; J Bregeon; A Brez; M Brigida; P Bruel; T. H Burnett; G. A Caliandro; R. A Cameron; P. A Caraveo; J. M Casandjian; E Cavazzuti; C Cecchi; Ö Çelik; A Chekhtman; C. C Cheung; J Chiang; S Ciprini; R Claus; J Cohen-Tanugi; J Conrad; S Cutini; C. D Dermer; A de Angelis; F de Palma; E do Couto e Silva; P. S Drell; A Drlica-Wagner; R Dubois; D Dumora; C Farnier; C Favuzzi; S. J Fegan; W. B Focke; P Fortin; M Frailis; Y Fukazawa; P Fusco; F Gargano; D Gasparrini; N Gehrels; S Germani; B Giebels; N Giglietto; P Giommi; F Giordano; T Glanzman; G Godfrey; I. A Grenier; J. E Grove; L Guillemot; S Guiriec; Y Hanabata; E Hays; R. E Hughes; M. S Jackson; G Jóhannesson; T Kamae; H Katagiri; N Kawai; J Kataoka; M Kerr; J Knödlseder; M. L Kocian; M Kuss; J Lande; L Latronico; F Loparco; B Lott; M. N Lovellette; P Lubrano; G. M Madejski; A Makeev; M. N Mazziotta; J. E McEnery; C Meurer; P. F Michelson; W Mitthumsiri; T Mizuno; A. A Moiseev; C Monte; M. E Monzani; A Morselli; I. V Moskalenko; S Murgia; P. L Nolan; J. P Norris; E Nuss; T Ohsugi; N Omodei; E Orlando; J. F Ormes; D Paneque; D Parent; V Pelassa; M Pepe; M Pesce-Rollins; F Piron; T. A Porter; S Rainò; R Rando; M Razzano; A Reimer; O Reimer; T Reposeur; A. Y Rodriguez; M Roth; F Ryde; H. F. -W Sadrozinski; D Sanchez; A Sander; P. M Saz Parkinson; J. D Scargle; C Sgrò; M. S Shaw; E. J Siskind; P. D Smith; G Spandre; P Spinelli; M. S Strickman; D. J Suson; H Tajima; H Takahashi; J. B Thayer; J. G Thayer; L Tibaldo; D. F Torres; G Tosti; A Tramacere; Y Uchiyama; T. L Usher; V Vasileiou; N Vilchez; V Vitale; A. P Waite; P Wang; B. L Winer; T Ylinen; K. S Wood; M Ziegler; S. D Barber; D. M Terndrup; VERITAS Collaboration; FERMI LAT Collaboration

doi:10.1088/2041-8205/708/2/L100

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Discovery of very high energy gamma rays from PKS 1424+240 and multiwavelength constraints on its redshift

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Discovery of very high energy gamma rays from PKS 1424+240 and multiwavelength constraints on its redshift

V. A Acciari, E Aliu, T Arlen, T Aune, M Bautista, M Beilicke, W Benbow, M Böttcher, D Boltuch, S. M Bradbury, …

Astrophysical journal. Letters, Vol.708(2), pp.L100-L106

12/18/2009

DOI: 10.1088/2041-8205/708/2/L100

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Abstract

Here, we report the first detection of very high energy83Gamma-ray emission above 100 GeV. (VHE) gamma-ray emission above 140 GeV from PKS 1424+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. We can conclude after using the photon index measured with Fermi in combination with recent extragalactic background light absorption models that the VERITAS data has a redshift of PKS 1424+240 less than 0.66.

ASTRONOMY AND ASTROPHYSICS

BL Lacertae objects: individual (PKS 1424+240 + VER J1427+237), gamma rays: observations

Details

Title: Subtitle: Discovery of very high energy gamma rays from PKS 1424+240 and multiwavelength constraints on its redshift
Creators: V. A Acciari - Harvard University
E Aliu - Columbia University
T Arlen
T Aune
M Bautista - McGill University
M Beilicke - Washington University in St. Louis
W Benbow - Harvard University
M Böttcher - North-West University
D Boltuch - University of Delaware
S. M Bradbury - University of Leeds
J. H Buckley
A Cesarini - Ollscoil na Gaillimhe – University of Galway
T Tanaka
W Cui - Purdue University West Lafayette
C Duke
A Falcone - Pennsylvania State University
L Ciupik - Adler Planetarium
W. N Johnson
J. P Finley
G Finnegan - University of Utah
L Fortson - University of Minnesota
A Furniss - California State University, East Bay
J Holder - University of Delaware
N Galante - Harvard University
C. M Hui - University of Utah
T. B Humensky - Columbia University
Philip E Kaaret - University of Iowa, Physics and Astronomy
N Karlsson - Adler Planetarium
G. H Gillanders - Ollscoil na Gaillimhe – University of Galway
D Kieda - University of Utah
G Gyuk
R Guenette - McGill University
S Godambe
M Kertzman - DePauw University
J Grube - Adler Planetarium
A Konopelko - Pittsburg State University
D Hanna
H Krawczynski - Washington University in St. Louis
F Krennrich
S LeBohec - University of Utah
G Maier
S McArthur - Purdue University West Lafayette
A McCann
M McCutcheon - McGill University
J Millis - Anderson University - Indiana
P Moriarty
T Nagai - Tokyo Institute of Technology
R. A Ong - University of California, Berkeley
A. N Otte - Georgia Institute of Technology
D Pandel - University of Iowa
J. S Perkins
A Pichel - Universidad de Buenos Aires
M Pohl - University of Potsdam
J Quinn
K Ragan - McGill University
L. C Reyes
P. T Reynolds - Cork Institute of Technology
E Roache - Harvard University
H. J Rose - University of Leeds
M Schroedter - Iowa State University
G. H Sembroski - Purdue University West Lafayette
G Demet Senturk - Columbia University
D Steele - Adler Planetarium
S. P Swordy - University of Chicago
M Theiling - Harvard University
S Thibadeau - Washington University in St. Louis
A Varlotta - Purdue University West Lafayette
V. V Vassiliev - McGill University
R. G Wagner
S. P Wakely - University of Chicago
J. E Ward
T. C Weekes - Harvard University
D Gall
A Weinstein
M. J Lang - Ollscoil na Gaillimhe – University of Galway
T Weisgarber - University of Chicago
D. A Williams
S Wissel
A. W Smith
M Wood
B Zitzer - Argonne National Laboratory
D. J Thompson - University of Iowa, Center for Health Effects of Environmental Contamination
A. A Abdo - United States Naval Research Laboratory
S Vincent
M Ackermann
V Bugaev - Washington University in St. Louis
M Ajello - Stanford University
L Baldini - Beth Israel Deaconess Medical Center
K Byrum - Argonne National Laboratory
J Ballet
A. S Johnson
G Barbiellini - University of Trieste
Y. C Chow
D Bastieri
A Cannon
B. M Baughman
K Bechtol - Stanford University
F Longo
R Bellazzini
P Cogan - McGill University
B Berenji - Stanford University
R. D Blandford - SLAC National Accelerator Laboratory
E. D Bloom
E Bonamente
A. W Borgland
J Bregeon
A Brez
M Brigida
P Bruel
T. H Burnett
G. A Caliandro
R. A Cameron
P. A Caraveo
J. M Casandjian
E Cavazzuti
C Cecchi - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
Ö Çelik
A Chekhtman
C. C Cheung
J Chiang
S Ciprini - University of Perugia
R Claus
J Cohen-Tanugi
J Conrad - Stockholm University
S Cutini
C. D Dermer
A de Angelis
F de Palma - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
E do Couto e Silva
P. S Drell
A Drlica-Wagner
R Dubois
D Dumora
C Farnier - University of Geneva
C Favuzzi
S. J Fegan - École Polytechnique
W. B Focke
P Fortin - Harvard University
M Frailis
Y Fukazawa - Hiroshima University
P Fusco
F Gargano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
D Gasparrini
N Gehrels
S Germani
B Giebels
N Giglietto - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
P Giommi
F Giordano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
T Glanzman
G Godfrey
I. A Grenier
J. E Grove
L Guillemot
S Guiriec
Y Hanabata - The University of Tokyo
E Hays
R. E Hughes
M. S Jackson
G Jóhannesson - KTH Royal Institute of Technology
T Kamae
H Katagiri
N Kawai - Tokyo Institute of Technology
J Kataoka - Tokyo Institute of Technology
M Kerr
J Knödlseder
M. L Kocian
M Kuss
J Lande
L Latronico
F Loparco
B Lott
M. N Lovellette
P Lubrano
G. M Madejski - Stanford University
A Makeev
M. N Mazziotta - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
J. E McEnery - University of Maryland, College Park
C Meurer
P. F Michelson
W Mitthumsiri
T Mizuno - Hiroshima University
A. A Moiseev
C Monte
M. E Monzani
A Morselli
I. V Moskalenko
S Murgia
P. L Nolan
J. P Norris
E Nuss
T Ohsugi
N Omodei
E Orlando
J. F Ormes
D Paneque - Max Planck Society
D Parent
V Pelassa - Harvard University
M Pepe
M Pesce-Rollins
F Piron
T. A Porter
S Rainò - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
R Rando
M Razzano
A Reimer
O Reimer
T Reposeur
A. Y Rodriguez
M Roth
F Ryde - KTH Royal Institute of Technology
H. F. -W Sadrozinski
D Sanchez
A Sander
P. M Saz Parkinson
J. D Scargle
C Sgrò
M. S Shaw
E. J Siskind
P. D Smith
G Spandre
P Spinelli
M. S Strickman
D. J Suson
H Tajima
H Takahashi
J. B Thayer
J. G Thayer
L Tibaldo - SLAC National Accelerator Laboratory
D. F Torres
G Tosti
A Tramacere
Y Uchiyama - SLAC National Accelerator Laboratory
T. L Usher
V Vasileiou
N Vilchez
V Vitale
A. P Waite
P Wang - Chinese Academy of Sciences
B. L Winer - Princeton University
T Ylinen - KTH Royal Institute of Technology
K. S Wood
M Ziegler
S. D Barber
D. M Terndrup
VERITAS Collaboration
FERMI LAT Collaboration
Resource Type: Journal article
Publication Details: Astrophysical journal. Letters, Vol.708(2), pp.L100-L106
DOI: 10.1088/2041-8205/708/2/L100
ISSN: 2041-8205
eISSN: 2041-8213
Publisher: Institute of Physics (IOP)
Language: English
Date published: 12/18/2009
Academic Unit: Physics and Astronomy
Record Identifier: 9984199836202771

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