- Papers and Conference Contributions by HEGRA members -
HEGRA-related papers and conference contributions by HEGRA members and coworkers,
including technical, theoretical, and interpretation papers in journals.
High Energy Gamma-Ray Astronomy
H.J. Völk
Proceedings of the
Eigth International Workshop on Topics in Astroparticle and Underground
Physics (TAUP2003), University of Washington, Seattle, USA, 5-9 September 2003
Preprint: astro-ph/0401122
Abstract,
Paper (PostScript)
Paper (PDF)
TeV Gamma-Ray Observations and the Origin of Cosmic Rays III
H.J. Völk
Plenary Talk at the 28th International Cosmic
Ray Conference, July 31 - August 7, 2003, in Tsukuba, Japan.
To be published
2003 by Universal Academy Press, Inc. - Tokyo, Japan
Preprint: astro-ph/0312585
Abstract,
Paper (PostScript)
Paper (PDF)
Ground-Based Gamma-Ray Detection of High Energy Galactic Sources: An Update
G. Rowell
To appear in "Young Neutron Stars and Their Environments"
(IAU Symposium 218, Sydney Australia July 2003,
ASP Conference Proceedings), eds F. Camilo and B. M. Gaensler
Preprint: astro-ph/0311483
Abstract,
Paper (PostScript)
Paper (PDF)
Multiwavelength Observations of Strong Flares From the TeV-Blazar 1ES 1959+650
H. Krawczynski, F.A. Aharonian, N. Götting, D. Horns et al.
Astrophysical Journal, 601, 151-164 (2004)
Abstract,
Paper (PDF)
A new template background estimate for source searching in TeV gamma-ray astronomy
G. Rowell
Astronomy and Astrophysics 410, 389-396 (2003)
Abstract,
Paper (PostScript)
Paper (PDF)
Cosmic ray production in supernova remnants including reacceleration:
The secondary to primary ratio
E.G. Berezhko, L.T. Ksenofontov, V.S. Ptuskin, V.N. Zirakashvili
and H.J. Völk
Astronomy & Astrophysics 410, 189-198 (2003)
Abstract,
Paper (PostScript),
Paper (PDF)
Systematic Variation of Cosmic Ray Injection Across Supernova Shocks
Heinrich J. Voelk, E.G. Berezhko, and L.T. Ksenofontov
28th International Cosmic Ray Conference, Proceedings
Paper (PDF)
Inverse Compton Gamma-Ray Background Due to Supernova Remnants
Evgeny G. Berezhko and H.J. Voelk
28th International Cosmic Ray Conference, Proceedings
Paper (PDF)
Gamma-ray emission from Cassiopeia A produced by accelerated cosmic rays
Berezhko, E. G.; Pühlhofer, G.; Völk, H. J.
Astronomy and Astrophysics, v.400, p.971-980 (2003)
Abstract,
Paper (PDF)
Similarities and differences between relativistic electron-photon cascades
developed in matter, photon gas and magnetic field
Aharonian, F. A.; Plyasheshnikov, A. V.
Astroparticle Physics, Volume 19, Issue 4, p. 525-548 (2003)
Abstract,
Paper (PDF)
Neutrinos from Accreting Neutron Stars
Anchordoqui, Luis A.; Torres, Diego F.; McCauley, Thomas P.; Romero, Gustavo E.; Aharonian, Felix A.
The Astrophysical Journal, Volume 589, Issue 1, pp. 481-486 (2003)
Abstract,
Paper (PDF)
Fine-structure in the nonthermal X-ray emission of SNR RX J1713.7-3946 revealed by Chandra
Uchiyama, Y.; Aharonian, F. A.; Takahashi, T.
Astronomy and Astrophysics, v.400, p.567-574 (2003)
Abstract,
Paper (PDF)
Exploring physics of rotation powered pulsars with sub-10 GeV imaging atmospheric Cherenkov telescopes
Aharonian, F. A.; Bogovalov, S. V.
New Astronomy, Volume 8, Issue 2, p. 85-103 (2003)
Abstract,
Paper (PDF)
Emission of SN 1006 produced by accelerated cosmic rays
Berezhko, E. G.; Ksenofontov, L. T.; Völk, H. J.
Astronomy and Astrophysics, v.395, p.943-953 (2002)
Abstract,
Paper (PDF)
The high energy gamma-ray emission expected from Tycho's supernova remnant
Völk, H. J.; Berezhko, E. G.; Ksenofontov, L. T.; Rowell, G. P.
Astronomy and Astrophysics, v.396, p.649-656 (2002)
Abstract,
Paper (PDF)
Time-dependent modelling of the Markarian 501 X-ray and TeV gamma-ray data taken during 1997 March and April
Krawczynski, H.; Coppi, P. S.; Aharonian, F.
Monthly Notice of the Royal Astronomical Society, Volume 336, Issue 3, pp. 721-735 (2002)
Abstract
Constraints on the extremely high-energy cosmic ray accelerators from classical electrodynamic
Aharonian, F. A.; Belyanin, A. A.; Derishev, E. V.; Kocharovsky, V. V.; Kocharovsky, Vl. V.
Physical Review D, vol. 66, Issue 2, id. 023005 (2002)
Abstract,
Paper
External Compton emission from relativistic jets in Galactic black hole candidates and ultraluminous X-ray source
Georganopoulos, M.; Aharonian, F. A.; Kirk, J. G.
Astronomy and Astrophysics, v.388, p.L25-L28 (2002)
Abstract,
Paper (PDF)
ASCA View of the Supernova Remnant Gamma Cygni (G78.2+2.1): Bremsstrahlung X-Ray Spectrum from Loss-flattened
Electron Distribution
Uchiyama, Y.; Takahashi, T.; Aharonian, F. A.; Mattox, J. R.
The Astrophysical Journal, Volume 571, Issue 2, pp. 866-875 (2002)
Abstract,
Paper (PDF)
Proton-synchrotron radiation of large-scale jets in active galactic nuclei
Aharonian, F. A.
Monthly Notices of the Royal Astronomical Society, Volume 332, Issue 1, pp. 215-230 (2002)
Abstract,
Astronomy: The cosmic accelerator
Aharonian, F. A.
Nature, Volume 416, Issue 6883, pp. 797-798 (2002)
Abstract,
Paper
On the origin of highest energy gamma-rays from Mkn 501
Aharonian, F. A.; Timokhin, A. N.; Plyasheshnikov, A. V.
Astronomy and Astrophysics, v.384, p.834-847 (2002)
Abstract,
Paper (PDF)
Large-Scale Extragalactic Jets Powered by Very-High-Energy Gamma Rays
Neronov, A.; Semikoz, D.; Aharonian, F.; Kalashev, O.
Physical Review Letters, vol. 89, Issue 5, id. 051101 (2002)
Abstract,
Paper
Intercalibration of Cherenkov Telescopes in Telescope Arrays
W. Hofmann
Submitted to Astroparticle Physics
Abstract,
Paper (PDF)
Modelling the TeV gamma-ray spectra of two low redshift AGNs: Mkn 501
and Mkn 421
A.K. Konopelko, A. Mastichiadis, J.G. Kirk, O.C. de Jager, F.W. Stecker
Accepted for publication in The Astrophysical Journal
Preprint: astro-ph/0302049
Abstract,
Paper (PostScript)
Astrophysics with High Energy Gamma Rays
H.J. Völk
To appear in "Astronomy, Cosmology and
Fundamental Physics", ed. P. A. Shaver, L. Di Lella, and A. Gimenez, Proc.
ESA-CERN-ESO Symposium, Garching, March 2002. Springer-Verlag, Berlin,
Heidelberg, series "ESO Astrophysics Symposia"
Preprint: astro-ph/0210297
Abstract,
Paper (PostScript)
Observations of the Crab Nebula with the HEGRA system of IACTs in
convergent mode using a topological trigger
F. Lucarelli, A. Konopelko, F. Aharonian, W. Hofmann,
A. Kohnle, H. Lampeitl and V. Fonseca
Abstract ,
Paper (PDF)
Monte Carlo studies on the sensitivity of the HEGRA imaging atmospheric
Cerenkov telescope system in observations of extended gamma-ray sources
A. Konopelko, F. Lucarelli,
H. Lampeitl and W. Hofmann
Preprint: astro-ph/0209431
Abstract,
Paper (PostScript)
A method to correct HILLAS parameters of imaging Cherenkov telescope data taken
at different background light levels
M. Kestel, D. Kranich, E. Lorenz
27th ICRC, Hamburg 2001, OG 2.3.269, Vol. 7, p. 2965 Paper (pdf)
Expected TeV gamma-ray emission from Tycho´s supernova remnant
H.J. Völk, G. Rowell
27th ICRC, Hamburg 2001, OG 2.2.talk, Vol. 6, p. 2469 Paper (pdf)
Cosmic Rays from SNRs and TeV Gamma-Ray Astronomy
G.P. Rowell
Talk presented at the conference 'GAME2001' Mt. Abu, India, March 2001
Preprint: astro-ph/0112214
Abstract,
Paper (PostScript)
Gamma Rays from Molecular Clouds
F.A. Aharonian
Space Science Reviews 99, 187-196 (2001)
Preprint: astro-ph/0012290
Abstract,
Paper (PostScript)
Particle Identification by Multifractal Parameters in Gamma-Astronomy
with the HEGRA-Cherenkov-Telescopes
B.M. Schaefer, W. Hofmann, H. Lampeitl, M. Hemberger
Nucl. Instr. Meth. A, 465, 394 (2001)
Abstract,
Paper (PDF)
How to focus a Cherenkov telescope
W. Hofmann
Journal of Phys. G, 27, 933 (2001)
Abstract,
Paper (PDF)
5@5 - A 5 GeV energy threshold array of imaging atmospheric Cherenkov telescopes at 5 km altitude
F.A. Aharonian, A.K. Konopelko, H.J. Voelk, H. Quintana
Submitted to Astroparticle Physics
Abstract,
Paper (PDF)
Feasibility study of an absolute energy calibration of imaging
atmospheric Cherenkov telescopes by starlight
O. Karschnick, H.J. Gils, W. Stamm
Astron. Astrophys. Suppl. Ser. 143, 535-539 (2000)
Paper (PostScript)
Constraints on the Cosmic Infra-Red Background based on BeppoSAX and CAT spectra of Mkn 501
J. Guy, C. Renault, F.A. Aharonian, M. Rivoal, J.-P. Tavernet
Accepted for publication in Astronomy and Astrophysics
Preprint: astro-ph/0004355
Abstract,
Paper (PostScript)
On the gamma-ray fluxes expected from Cassiopeia A.
A.M. Atoyan, F.A. Aharonian, R.J. Tuffs, H.J. Völk,
Submitted.
Preprint: astro-ph/0001186
Abstract,
Paper (PostScript)
ALTAI: Computational code for the simulations of TeV
air showers as observed with the ground-based
imaging atmospheric Cherenkov telescopes.
A. Konopelko and A. Plyasheshnikov,
Nuclear Instruments and Methods (Section A), in press.
Preprint: astro-ph/0001541
Abstract,
Paper (PostScript)
On the potential of the imaging atmospheric Cherenkov
technique for study of cosmic gamma rays in the energy
range 10-100 TeV.
A.V. Plyasheshnikov, F.A. Aharonian, and H.J. Völk,
Journal of Physics G, 26, 183-201 (2000).
Paper (PostScript)
Impact of atmospheric parameters on the atmospheric
Cherenkov technique.
K. Bernlöhr,
Astroparticle Physics, 12, 255-268 (2000).
Preprint: astro-ph/9908093
Abstract,
Paper (PostScript)
X-ray/TeV-gamma-ray observations of several strong flares of
Mkn 501 during 1997 and implications.
H. Krawczynski, P.S. Coppi, T. Maccarone, and F.A. Aharonian,
Astronomy and Astrophysics 353, 97-107 (2000).
Paper (PostScript)
The TeV spectrum of MKN 501 as measured during the high state in 1997
by the HEGRA stereoscopic system of imaging air Cerenkov telescopes
A. Konopelko
Astroparticle Physics 11, 135-139 (1999).
Paper (PDF)
TeV AGN observations by HEGRA
E. Lorenz
Astroparticle Physics 11, 131-134 (1999).
Paper (PDF)
Effectiveness of TeV gamma-ray observations at
large zenith angles with a
stereoscopic system of imaging atmospheric Cherenkov telescopes.
A. Konopelko et al.,
Journal of Physics G 25 1989-2000 (1999).
Preprint: astro-ph/9906405
Abstract,
Paper (PostScript)
Evidence for intergalactic absorption in the TeV gamma-ray
spectrum of Mkn 501.
A.K. Konopelko, J.G. Kirk, F.W. Stecker, and A. Mastichiadis,
Astrophysical Journal Letters 518, L13-L15 (1999).
Preprint: astro-ph/9904057
Abstract,
Paper (PostScript)
An upper limit on the infrared background density from HEGRA data on Mkn 501
B. Funk et al.
Astroparticle Physics 9, 97-103 (1998)
Paper (PDF)
Changes of the cosmic-ray mass composition in the
1014 - 1016 eV energy range
K. Bernlöhr, W. Hofmann, G. Leffers, V. Matheis,
M. Panter, and R. Zink,
Astroparticle Physics 8, 253-264 (1998)
Paper (PDF)
A new method to reconstruct the energy and determine the
composition of cosmic rays from the
measurement of Cherenkov light and particle densities in
extensive air showers
A. Lindner,
Astroparticle Physics 8, 235-252 (1998).
Paper (PDF)
Status and Results from the HEGRA Air Shower Experiment
V. Fonseca
Astrophysics and Space Science 263, 377-380 (1998).
Characteristics of the multi-telescope coincidence trigger of
the HEGRA IACT system
N. Bulian et al.,
Astroparticle Physics 8, 223-233 (1998).
Paper (PDF)
Study of mass composition and energy spectrum of
primary cosmic radiation by the imaging
atmospheric Cherenkov technique.
A.V. Plyasheshnikov et al.,
Journal of Physics G 24, 653-672 (1998).
The optical layout of the HEGRA Cherenkov telescopes
A. Akhperjanian et al.,
Experimental Astronomy, 8 135-152 (1998).
Paper (PostScript)
Cosmic rays VII.
Individual element spectra: prediction and data.
B. Wiebel-Sooth, P.L. Biermann, and H. Meyer,
Astronomy and Astrophysics 330, 389-398 (1998).
Paper (Postscript),,
Figures (Postscript)
Locating TeV gamma-ray sources with sub-arcminute precision:
the pointing calibration of the
HEGRA system of imaging atmospheric Cherenkov telescopes.
G. Pühlhofer, A. Daum, G. Hermann, M. Heß, W. Hofmann,
C. Köhler, M. Panter,
Astroparticle Physics 8, 101-108 (1997).
Abstract,
Paper (PDF)
Calibration of the sensitivity of imaging atmospheric
Cherenkov telescopes using a reference light source
A. Frass et al.,
Astroparticle Physis 8, 91-99 (1997).
Preprint: astro-ph/9707304
Abstract,
Paper (PostScript)
On the influence of afterpulsing in PMTs on the trigger threshold
of multichannel light detectors in self-trigger mode.
R. Mirzoyan, E. Lorenz, D. Petry, and C. Prosch,
Nuclear Instruments and Methods A 387, 74-78 (1997).
Gamma-ray astronomy with imaging atmospheric Cerenkov
telescopes.
F.A. Aharonian and C.W. Akerlof,
Ann. Rev. Nucl. Part. Sci. 47, 273-314 (1997).
Inverse Compton gamma radiation of faint synchrotron
X-ray nebulae around pulsars.
F.A. Aharonian, A.M. Atoyan, and T. Kifune,
Mon. Not. R. Astron. Soc. 291, 162--176 (1997).
An improved technique for the determination of shower
geometry from single and stereo IACT images
Ulrich, M., et al.,
Journal of Physics G 24, 883-897 (1997).
Paper (Postscript),
Methods for determining the primary energy of cosmic-ray
showers.
J. Cortina, F. Arqueros, and E. Lorenz,
Journal of Physics G 23, 1733-1749 (1997).
Paper (Postscript)
The potential of ground based arrays of imaging atmospheric
Cherenkov telescopes. II. Gamma ray flux sensitivities.
F.A. Aharonian et al.,
Astroparticle Physics 6, 369-377 (1997).
Paper (PostScript)
The potential of ground based arrays of imaging atmospheric
Cherenkov telescopes. I. Determination of shower parameters.
F.A. Aharonian et al.,
Astroparticle Physics 6, 343-368 (1997).
Paper (PostScript)
Trigger conditions and effective areas of imaging air
Cerenkov telescopes.
C. Köhler et al.,
Astropartarticle Physics 6, 77-85 (1996).
Measuring the UHE cosmic-ray composition with tracking
detectors in air shower arrays.
K. Bernlöhr,
Astroparticle Physics 5, 139-146 (1996).
Preprint: astro-ph/9605177
Abstract,
Paper (PostScript)
The gamma ray burst rate at high photon energies.
K. Mannheim, D. Hartmann, and B. Funk,
Astrophysical Journal 467, 532-536 (1996).
Preprint: astro-ph/9605108
Abstract,
Paper (PostScript)
Beacons at the gamma ray horizon.
K. Mannheim, S. Westerhoff, H. Meyer, and H.-H. Fink,
Astronomy and Astrophysics 315, 77-85 (1996).
Preprint: astro-ph/9605107
Abstract,
Paper (PostScript)
Separation of gamma and hadron initiated air
showers with energies between 20 and 500 TeV.
F. Arqueros, A. Karle, E. Lorenz, S. Martinez, R. Plaga,
and M. Rozanska,
Astroparticle Physics 4, 309-332 (1996).
On the emissivity of pi0-decay gamma
radiation in the vicinity of accelerators of galactic cosmic rays.
F.A. Aharonian and A.M. Atoyan,
Astronomy and Astrophysics 309, 917-928 (1996).
Operation and performance of the Cosmic Ray Tracking (CRT)
detector system.
K. Bernlöhr et al.,
Nuclear Instruments and Methods A 369. 293-305 (1996).
Paper (PostScript)
Separating gamma- and hadron-induced cosmic ray air showers
with feed-forward neural networks using the charged particle
information.
S. Westerhoff et al.,
Astroparticle Physics 4, 119-132 (1995). Abstract,
Paper (PostScript)
Monte Carlo simulation of the HEGRA cosmic ray
detector performance.
S. Martinez et al.,
Nuclear Instruments and Methods A 357, 567-579 (1995).
Paper (PostScript)
Design and performance of the angle integrating
Cherenkov array AIROBICC.
A. Karle et al.,
Astroparticle Physics 3, 321-347 (1995).
Abstract,
Paper (PDF)
High energy electrons and positrons in cosmic rays
as an indicator of the existence of a nearby cosmic tevatron.
F.A. Aharonian, A.M. Atoyan, and H. J. Völk,
Astronomy and Astrophysics 294, L41--L44 (1995).
On the optimization of multichannel cameras for
imaging atmospheric Cherenkov telescopes.
F. Aharonian et al.,
Journal of Physics G 21, 985-993 (1995).
On the optimization of multichannel cameras for
imaging atmospheric Cherenkov telescopes.
F. Aharonian et al.,
Journal of Physics G 21, 985-993 (1995).
On the accuracy of determination of fluxes and energy spectra
of primary gamma rays by a single imaging atmospheric
Cherenkov telescope.
F. Aharonian et al.,
Journal of Physics G 21, 419-428 (1995).
Does the inverse compton mechanism alone explain the
GeV/TeV gamma-ray emission from the Crab nebula.
F.A. Aharonian and A.M. Atoyan,
Astroparticle Physics 3, 275 (1995).
Cosmic ray individual element spectra: prediction and data.
B. Wiebel-Sooth, P.L. Biermann, and H. Meyer,
24th ICRC, Rome 1995, Paper OG 5.3.5, Vol. 2, p. 656.
Paper (PostScript)
Cosmic ray electron spectra: prediction and data.
B. Wiebel-Sooth, P.L. Biermann, and H. Meyer,
24th ICRC, Rome 1995, Paper OG 7.2.7, Vol. 3, p. 45.
Paper (PostScript)
The gamma-ray visibility of supernova remnants.
A test of cosmic ray origin.
L. O'C. Drury, F. A. Aharonian, and H. J. Völk,
Astronomy and Astrophysics 287, 959-971 (1994).
GeV/TeV gamma-ray emission from dense molecular clouds
overtaken by SN shells.
F.A. Aharonian, L.O'C. Drury, and H.J. Völk.,
Astronomy and Astrophysics 285, 645 (1994).
Very high energy gamma rays from active galactic nuclei:
Cascading on the
cosmic background radiation fields and the formation of
pair halos.
F.A. Aharonian, P.S. Coppi and H.J. Völk,
Astrophysical Journal 423, L5-L8 (1994).
The system of imaging atmospheric Cherenkov telescopes: The new
prospects for the VHE gamma-ray astronomy.
F.A. Aharonian et al.,
Experimental Astronomy 2, 331-344 (1993).
A new air Cerenkov counter concept for the observation of extended
air showers.
M. Bott-Bodenhausen et al.,
Nuclear Instruments and Methods A 315, 236 (1992).
A multidimensional analysis of the Cherenkov images of air showers
induced by very high energy gamma-rays and protons.
F. A. Aharonian et al.,
Nuclear Instruments and Methods A 302, 522-528 (1991).
Ultra high energy gamma ray astronomy at the Observatorio del Roque de
los Muchachos on La Palma / Canary Islands.
M. Bott-Bodenhausen,
Astrophysical Letters 28, 195 (1991).