Discovery of TeV γ-ray emission from PKS 0447-439 and derivation of an upper limit on its redshift
- Abramowski, A.
- Acero, F.
- Akhperjanian, A. G.
- Anton, G.
- Balenderan, S.
- Medina, Maria Clementina
- Terrier, R.
- Tluczykont, M.
- Trichard, C.
- Valerius, K.
- van Eldik, C.
- Vasileiadis, G.
- Venter, C
- Viana, A.
- Vincent, P.
- Völk, H. J.
- Volpe, F.
- Vorobiov, S.
- Vorster, M.
- Wagner, S. J.
- Ward, M.
- White, R.
- Wierzcholska, A.
- Wouters, D.
- Zacharias, M.
- Zajczyk, A.
- Zdziarski, A. A.
- Zech, A.
- Zechlin, H. S.
- Pelat, D.
DOIAbstract
Very high-energy γ-ray emission from PKS 0447−439 was detected with the H.E.S.S. Cherenkov telescope array in December 2009. This blazar is one of the brightest extragalactic objects in the Fermi bright source list and has a hard spectrum in the MeV to GeV range. In the TeV range, a photon index of 3.89 ± 0.37 (stat) ±0.22 (sys) and a flux normalisation at 1 TeV, Φ1 TeV = (3.5 ± 1.1(stat) ± 0.9(sys)) × 10-13 cm-2 s-1 TeV-1 were found. The detection with H.E.S.S. triggered observations in the X-ray band with the Swift and RXTE telescopes. Simultaneous UV and optical data from Swift UVOT and data from the optical telescopes ATOM and ROTSE are also available. The spectrum and light curve measured with H.E.S.S. are presented and compared ...
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