Discovery of Very High Energy Gamma Rays from PKS 1424+240 and Multiwavelength Constraints on its Redshift | Zendy

V. A. Acciari | Zendy; E. Aliu | Zendy; T. Arlen | Zendy; T. Aune | Zendy; M. A. Bautista | Zendy; M. Beilicke | Zendy; W. Benbow | Zendy; M. Bottcher | Zendy; D. Boltuch | Zendy; S.M. Bradbury | Zendy; J.H. Buckley | Zendy; V. Bugaev | Zendy; K. Byrum | Zendy; A. Can | Zendy; A. Cesarini | Zendy; Y.C. Chow | Zendy; L. Ciupik | Zendy; P. Cogan | Zendy; W. Cui | Zendy; C. Duke | Zendy; A. Falcone | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

Discovery of Very High Energy Gamma Rays from PKS 1424+240 and Multiwavelength Constraints on its Redshift

Author(s) -

V. A. Acciari,

E. Aliu,

T. Arlen,

T. Aune,

M. A. Bautista,

M. Beilicke,

W. Benbow,

M. Bottcher,

D. Boltuch,

S.M. Bradbury,

J.H. Buckley,

V. Bugaev,

K. Byrum,

A. Can,

A. Cesarini,

Y.C. Chow,

L. Ciupik,

P. Cogan,

W. Cui,

C. Duke,

A. Falcone

Publication year - 2012

Language(s) - English

Resource type - Reports

DOI - 10.2172/1046386

Subject(s) - physics , redshift , astrophysics , fermi gamma ray space telescope , bl lac object , blazar , extragalactic background light , spectral energy distribution , photon , flux (metallurgy) , astronomy , gamma ray , spectral index , observatory , galaxy , spectral line , optics , materials science , metallurgy

We report the first detection of very-high-energy (VHE) gamma-ray emission above 140GeV from PKS 1424+240, a BL Lac object with an unknown redshift. The photon spectrum above 140GeV measured by VERITAS is well described by a power law with a photon index of 3.8 {+-}0.5{sub stat} {+-} 0.3{sub syst} and a flux normalization at 200 GeV of (5.1 {+-} 0.9{sub stat} {+-} 0.5{sub syst}) x 10{sup -11} TeV{sup -1} cm{sup -2} s{sup -1}, where stat and syst denote the statistical and systematical uncertainty, respectively. The VHE flux is steady over the observation period between MJD 54881 and 55003 (2009 February 19 to June 21). Flux variability is also not observed in contemporaneous high energy observations with the Fermi Large Area Telescope (LAT). Contemporaneous X-ray and optical data were also obtained from the Swift XRT and MDM observatory, respectively. The broadband spectral energy distribution (SED) is well described by a one-zone synchrotron self-Compton (SSC) model favoring a redshift of less than 0.1. Using the photon index measured with Fermi in combination with recent extragalactic background light (EBL) absorption models it can be concluded from the VERITAS data that the redshift of PKS 1424+240 is less than 0.66

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research