Sökning: WFRF:(Meurer G. R.) > Discovery of very h...
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000 | 11013naa a2203265 4500 | |
001 | oai:DiVA.org:kth-29080 | |
003 | SwePub | |
008 | 110125s2010 | |||||||||||000 ||eng| | |
024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-290802 URI |
024 | 7 | a https://doi.org/10.1088/2041-8205/708/2/L1002 DOI |
040 | a (SwePub)kth | |
041 | a engb eng | |
042 | 9 SwePub | |
072 | 7 | a ref2 swepub-contenttype |
072 | 7 | a art2 swepub-publicationtype |
100 | 1 | a Acciari, V. A.4 aut |
245 | 1 0 | a Discovery of very high energy gamma rays from PKS 1424+240 and multiwavelength constraints on ITS redshift |
264 | 1 | c 2010 |
338 | a print2 rdacarrier | |
500 | a QC 20110125 | |
520 | a We report the first detection of very high energy(83) (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 +/- 0.5(stat) +/- 0.3(syst) and a flux normalization at 200 GeV of (5.1 +/- 0.9(stat) +/- 0.5(syst)) x 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. | |
650 | 7 | a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe |
650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng |
653 | a BL Lacertae objects: individual (PKS 1424+240=VER J1427+237) | |
653 | a gamma rays: observations | |
653 | a Astronomy and astrophysics | |
653 | a Astronomi och astrofysik | |
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773 | 0 | t ASTROPHYSICAL JOURNAL LETTERSg 708:2, s. L100-L106q 708:2<L100-L106x 2041-8205 |
856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-29080 |
856 | 4 8 | u https://doi.org/10.1088/2041-8205/708/2/L100 |
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