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@ARTICLE{Collaboration:165671,
author = {Abramowski, A. and Acero, F. and Akhperjanian, A. G. and
Anton, G. and Balenderan, S. and Balzer, A. and Barnacka, A.
and Becherini, Y. and Becker Tjus, J. and Behera, B. and
Bernlöhr, K. and Birsin, E. and Biteau, J. and Bochow, A.
and Boisson, C. and Bolmont, J. and Bordas, P. and Brucker,
J. and Brun, F. and Brun, P. and Bulik, T. and Carrigan, S.
and Casanova, S. and Cerruti, M. and Chadwick, P. M. and
Chaves, R. C. G. and Cheesebrough, A. and Colafrancesco, S.
and Cologna, G. and Conrad, J. and Couturier, C. and Dalton,
M. and Daniel, M. K. and Davids, I. D. and Degrange, B. and
Deil, C. and deWilt, P. and Dickinson, H. J. and
Djannati-Ataï, A. and Domainko, W. and Drury, L. O’C. and
Dubus, G. and Dutson, K. and Dyks, J. and Dyrda, M. and
Egberts, K. and Eger, P. and Espigat, P. and Fallon, L. and
Farnier, C. and Fegan, S. and Feinstein, F. and Fernandes,
M. V. and Fernandez, D. and Fiasson, A. and Fontaine, G. and
Förster, A. and Füßling, M. and Gajdus, M. and Gallant,
Y. A. and Garrigoux, T. and Gast, H. and Giebels, B. and
Glicenstein, J. F. and Glück, B. and Göring, D. and
Grondin, M.-H. and Grudzińska, M. and Häffner, S. and
Hague, J. D. and Hahn, J. and Hampf, D. and Harris, J. and
Heinz, S. and Heinzelmann, G. and Henri, G. and Hermann, G.
and Hillert, A. and Hinton, J. A. and Hofmann, W. and
Hofverberg, P. and Holler, M. and Horns, D. and
Jacholkowska, A. and Jahn, C. and Jamrozy, M. and Jung, I.
and Kastendieck, M. A. and Katarzyński, K. and Katz, U. and
Kaufmann, S. and Khélifi, B. and Klepser, S. and Klochkov,
D. and Kluźniak, W. and Kneiske, T. and Kolitzus, D. and
Komin, Nu. and Kosack, K. and Kossakowski, R. and Krayzel,
F. and Krüger, P. P. and Laffon, H. and Lamanna, G. and
Lefaucheur, J. and Lemoine-Goumard, M. and Lenain, J.-P. and
Lennarz, D. and Lohse, T. and Lopatin, A. and Lu, C.-C. and
Marandon, V. and Marcowith, A. and Masbou, J. and Maurin, G.
and Maxted, N. and Mayer, M. and McComb, T. J. L. and
Medina, M. C. and Méhault, J. and Menzler, U. and Moderski,
R. and Mohamed, M. and Moulin, E. and Naumann, C. L. and
Naumann-Godo, M. and de Naurois, M. and Nedbal, D. and
Nguyen, N. and Niemiec, J. and Nolan, S. J. and Ohm, S. and
de Oña Wilhelmi, E. and Opitz, B. and Ostrowski, M. and
Oya, I. and Panter, M. and Parsons, R. D. and Paz Arribas,
M. and Pekeur, N. W. and Pelletier, G. and Perez, J. and
Petrucci, P.-O. and Peyaud, B. and Pita, S. and Pühlhofer,
G. and Punch, M. and Quirrenbach, A. and Raab, S. and Raue,
M. and Reimer, A. and Reimer, O. and Renaud, M. and de los
Reyes, R. and Rieger, F. and Ripken, J. and Rob, L. and
Rosier-Lees, S. and Rowell, G. and Rudak, B. and Rulten, C.
B. and Sahakian, V. and Sanchez, D. A. and Santangelo, A.
and Schlickeiser, R. and Schulz, A. and Schwanke, U. and
Schwarzburg, S. and Schwemmer, S. and Sheidaei, F. and
Skilton, J. L. and Sol, H. and Spengler, G. and Stawarz, Ł.
and Steenkamp, R. and Stegmann, C. and Stinzing, F. and
Stycz, K. and Sushch, I. and Szostek, A. and Tavernet, J.-P.
and Terrier, R. and Tluczykont, M. and Trichard, C. and
Valerius, K. and van Eldik, C. and Vasileiadis, G. and
Venter, C. and Viana, A. and Vincent, P. and Völk, H. J.
and Volpe, F. and Vorobiov, S. and Vorster, M. and Wagner,
S. J. and Ward, M. and White, R. and Wierzcholska, A. and
Wouters, D. and Zacharias, M. and Zajczyk, A. and Zdziarski,
A. A. and Zech, A. and Zechlin, H.-S. and Pelat, D.},
collaboration = {H.E.S.S.{ Collaboration}},
title = {{D}iscovery of {T}e{V} γ -ray emission from
{PKS} 0447-439 and derivation of an upper limit on its
redshift},
journal = {Astronomy and astrophysics},
volume = {552},
number = {118},
issn = {1432-0746},
address = {Les Ulis},
publisher = {EDP Sciences},
reportid = {DESY-2014-00637, arXiv:1303.1628},
pages = {1-14},
year = {2013},
note = {14 pages, 10 figures, accepted for publication in $A\&A$},
abstract = {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 to the multi-wavelength
data at lower energies. A rapid flare is seen in the Swift
XRT and RXTE data, together with a flux variation in the UV
band, at a time scale of the order of one day. A firm upper
limit of z < 0.59 on the redshift of PKS 0447−439 is
derived from the combined Fermi-LAT and H.E.S.S. data, given
the assumptions that there is no upturn in the intrinsic
spectrum above the Fermi-LAT energy range and that
absorption on the extragalactic background light (EBL) is
not weaker than the lower limit provided by current models.
The spectral energy distribution is well described by a
simple one-zone synchrotron self-Compton scenario, if the
redshift of the source is less than z ≲ 0.4.},
cin = {ZEU-EXP/AT},
ddc = {520},
cid = {$I:(DE-H253)ZEU-EXP_AT-20120731$},
pnm = {523 - High-energy gamma ray astronomy (POF2-523)},
pid = {G:(DE-HGF)POF2-523},
experiment = {EXP:(DE-MLZ)NOSPEC-20140101},
typ = {PUB:(DE-HGF)29 / PUB:(DE-HGF)16},
eprint = {1303.1628},
howpublished = {arXiv:1303.1628},
archivePrefix = {arXiv},
SLACcitation = {$\%\%CITATION$ = $arXiv:1303.1628;\%\%$},
UT = {WOS:000317912000117},
doi = {10.1051/0004-6361/201321108},
url = {https://bib-pubdb1.desy.de/record/165671},
}
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