HEGRA

- Papers by the HEGRA Collaboration -

• Observations of 14 young open star clusters with the HEGRA system of Cherenkov telescopes
  F. Aharonian, A. Akhperjanian, M. Beilicke et al. (The HEGRA Collaboration)
  Astronomy & Astrophysics 454, 775-779 (2006)
  DOI: 10.1051/0004-6361:20053234
   
• TeV gamma-ray observations of SS-433 and a survey of the surrounding field with the HEGRA IACT-System
  F. Aharonian, A. Akhperjanian, M. Beilicke et al. (The HEGRA Collaboration)
  Astronomy & Astrophysics 439, 635-643 (2005)
  DOI: 10.1051/0004-6361:20042248
   
• The unidentified TeV source (TeVJ2032+4130) and surrounding field: Final HEGRA IACT-System results
  F. Aharonian, A. Akhperjanian, M. Beilicke et al. (The HEGRA Collaboration)
  Astronomy & Astrophysics 431, 197-202 (2005)
  DOI: 10.1051/0004-6361:20041552
  Preprint: astro-ph/0501667
   
• The Crab Nebula and Pulsar between 500 GeV and 80 TeV: Observations with the HEGRA stereoscopic air Cherenkov telescopes
  F. Aharonian, A. Akhperjanian, M. Beilicke et al. (The HEGRA Collaboration)
  The Astrophysical Journal 614, 897-913 (2004)
  DOI: 10.1086/423931
  Preprint: astro-ph/0407118
   
• Observations of 54 Active Galactic Nuclei with the HEGRA System of Cherenkov Telescopes
  F. Aharonian, A. Akhperjanian, M. Beilicke et al. (The HEGRA Collaboration)
  Astronomy & Astrophysics 421, 529-537 (2004)
  DOI: 10.1051/0004-6361:20035764
  Preprint: astro-ph/0401301
   
• Observation of the Monoceros Loop SNR region with the HEGRA system of IACTs
  F. Aharonian, A. Akhperjanian, M. Beilicke et al. (The HEGRA Collaboration)
  Astronomy & Astrophysics 417, 973-979 (2004)
  DOI: 10.1051/0004-6361:20040011
   
• The Technical Performance of the HEGRA System of Imaging Air Cherenkov Telescopes
  G. Pühlhofer, O. Bolz, N. Götting et al. (The HEGRA Collaboration)
  Astroparticle Physics 20, 267-291 (2003)
  DOI: 10.1016/j.astropartphys.2003.06.001
  Preprint: astro-ph/0306123
   
• Detection of TeV Gamma-Rays from the BL Lac 1ES1959+650 in its low states and during a major outburst in 2002
  F.A. Aharonian et al. (The HEGRA Collaboration)
  Astronomy and Astrophysics 406, L9-L13 (2003)
  DOI: 10.1051/0004-6361:20030838
  Preprint: astro-ph/0305275
   
• TeV gamma-ray light curve and energy spectrum of Mkn 421 during its 2001 flare as measured with HEGRA CT1
  F.A. Aharonian et al. (The HEGRA Collaboration)
  Astronomy and Astrophysics 410, 813-821 (2003)
  DOI: 10.1051/0004-6361:20031265
   
• Search for TeV gamma ray emission from the Andromeda galaxy
  F.A. Aharonian et al. (The HEGRA Collaboration)
  Astronomy and Astrophysics 400, 153-159 (2003)
  DOI: 10.1051/0004-6361:20021895
  Preprint: astro-ph/0302347
   
• Is the Giant Radio Galaxy M87 a TeV Gamma-Ray Emitter?
  F.A. Aharonian et al. (The HEGRA Collaboration)
  Astronomy and Astrophysics 403, L1-L5 (2003)
  DOI: 10.1051/0004-6361:20030372
  Preprint: astro-ph/0302155
   
• Observations of H1426+428 with HEGRA - Observations in 2002 and reanalysis of 1999&2000 data
  F.A. Aharonian et al. (The HEGRA Collaboration)
  Astronomy and Astrophysics 403, 523-528 (2003)
  DOI: 10.1051/0004-6361:20030326
  Preprint: astro-ph/0301437
   
• A search for TeV gamma-ray emission from SNRs, pulsars and unidentified GeV sources in the Galactic plane in the longitude range between -2 deg and 85 deg
  F.A. Aharonian et al. (The HEGRA Collaboration)
  Astronomy and Astrophysics 395, 803-811 (2002)
  DOI: 10.1051/0004-6361:20021347
  Preprint: astro-ph/0209360
   
• An unidentified TeV source in the vicinity of Cygnus OB2
  F.A. Aharonian et al. (The HEGRA Collaboration)
  Astronomy and Astrophysics 393, L37-40 (2002)
  DOI: 10.1051/0004-6361:20021171
  Preprint: astro-ph/0207528
   
• Variations of the TeV energy spectrum at different flux levels of Mkn 421 observed with the HEGRA system of Cherenkov telescopes
  F.A. Aharonian et al. (The HEGRA Collaboration)
  Astronomy and Astrophysics 393, 89-99 (2002)
  DOI: 10.1051/0004-6361:20021005
  Preprint: astro-ph/0205499
   
• Search for point sources of gamma radiation above 15 TeV with the HEGRA AIROBICC array
  F.A. Aharonian et al. (The HEGRA Collaboration)
  Astronomy and Astrophysics 390, 39-46 (2002)
  DOI: 10.1051/0004-6361:20020686
  Preprint: astro-ph/0209402
   
• TeV gamma rays from the blazar H 1426+428 and the diffuse extragalactic background radiation
  F.A. Aharonian et al. (The HEGRA Collaboration)
  Astronomy and Astrophysics 384, L23-L26 (2002)
  DOI: 10.1051/0004-6361:20020206
  Preprint: astro-ph/0202072
   
• Limits on the TeV flux of diffuse gamma rays as measured with the HEGRA air shower array
  F.A. Aharonian et al. (The HEGRA Collaboration)
  Astroparticle Physics 17 (4), 459-475 (2002)
  DOI: 10.1016/S0927-6505(01)00175-X
  Preprint: astro-ph/0109145
   
• A study of Tycho's SNR at TeV energies with the HEGRA CT-System
  F.A. Aharonian et al. (The HEGRA Collaboration)
  Astronomy and Astrophysics 373, 292-300 (2001)
  DOI: 10.1051/0004-6361:20010591
  Preprint: astro-ph/0107044
   
• A search for gamma-ray emission from the Galactic plane in the longitude range between 37 deg and 43 deg
  F.A. Aharonian et al. (The HEGRA Collaboration)
  Astronomy and Astrophysics 375, 1008-1017 (2001)
  DOI: 10.1051/0004-6361:20010898
  Preprint: astro-ph/0106528
   
• Simultaneous X-Ray and TeV Gamma-Ray Observation of the TeV Blazar Markarian 421 during 2000 February and May
  H. Krawczynski, R. Sambruna, A. Kohnle, P.S. Coppi, The HEGRA Collaboration (F.A. Aharonian et al.)
  The Astrophysical Journal, 559, 187-195 (2001)
  DOI: 10.1086/322364
  Preprint: astro-ph/0105331
   
• Evidence for TeV gamma ray emission from Cassiopeia A
  F.A. Aharonian et al. (The HEGRA Collaboration),
  Astronomy and Astrophysics 370, 112-120 (2001)
  DOI: 10.1051/0004-6361:20010243
  Preprint: astro-ph/0102391
   
• Search for a TeV gamma-ray halo of Mkn 501
  F.A. Aharonian et al. (The HEGRA Collaboration),
  Astronomy and Astrophysics 366, 746-751 (2001)
  DOI: 10.1051/0004-6361:20000481
  Preprint: astro-ph/0012401
   
• Reanalysis of the high energy cutoff of the 1997 Mkn 501 TeV energy spectrum
  F.A. Aharonian et al. (The HEGRA Collaboration),
  Astronomy and Astrophysics 366, 62-67 (2001)
  DOI: 10.1051/0004-6361:20000098
  Preprint: astro-ph/0011483
   
• The TeV Energy Spectrum of Markarian 501 Measured with the Stereoscopic Telescope System of HEGRA during 1998 and 1999
  F.A. Aharonian et al. (The HEGRA Collaboration),
  The Astrophysical Journal, 546, 898-902 (2001)
  DOI: 10.1086/318321
  Preprint: astro-ph/0008211
   
• Optimizing the angular resolution of the HEGRA telescope system to study the emission region of VHE gamma rays in the Crab Nebula
  F.A. Aharonian et al. (The HEGRA Collaboration),
  Astronomy and Astrophysics, 361, 1073-1078 (2000)
  Preprint: astro-ph/0007367
   
• Rejection of the hypothesis that Mkn-501 TeV photons are pure Bose-Einstein condensates
  F.A. Aharonian et al. (The HEGRA Collaboration),
  The Astrophysical Journal Letters, 543, L39-L42 (2000)
  DOI: 10.1086/318171
  Preprint: astro-ph/0006092
   
• The Energy Spectrum of TeV Gamma-Rays from the Crab Nebula as measured by the HEGRA system of imaging air Cherenkov telescopes
  F.A. Aharonian et al. (The HEGRA Collaboration),
  The Astrophysical Journal, 539, 317-324 (2000)
  DOI: 10.1086/309225
  Preprint: astro-ph/0003182
   
• Correlated intense X-ray and TeV activity of Mrk-501 in 1998 June
  R.M. Sambruna, the HEGRA Collaboration et al.,
  The Astrophysical Journal, 538, 127-133 (2000)
  DOI: 10.1086/309133
  Preprint: astro-ph/0002215
   
• On the optimum spacing of stereoscopic imaging atmospheric Cherenkov telescopes
  W. Hofmann et al. (The HEGRA Collaboration),
  Astroparticle Physics 13, 253-258 (2000)
  DOI: 10.1016/S0927-6505(99)00126-7
  Preprint: astro-ph/9910443
   
• Energy Spectrum and Chemical Composition of Cosmic Rays between 0.3 and 10 PeV determined from the Cherenkov light and charged-particle distributions in air showers
  F. Arqueros et al. (The HEGRA Collaboration *),
  Astronomy and Astrophysics 359, 682-694 (2000)
  Preprint: astro-ph/9908202
   
• HEGRA search for TeV emission from BL Lac objects
  F.A. Aharonian et al. (The HEGRA Collaboration),
  Astronomy and Astrophysics 353, 847-852 (2000)
  Preprint: astro-ph/9903455
   
• Observations of Mkn 421 during 1997 and 1998 in the energy range above 500 GeV with the HEGRA stereoscopic Cherenkov telescope system
  F.A. Aharonian et al. (The HEGRA Collaboration),
  Astronomy and Astrophysics 350, 757-764 (1999)
  Preprint: astro-ph/9905032
   
• The temporal characteristics of the TeV Gamma emission from Mkn 501 in 1997 - Part II: Results from HEGRA CT1 and CT2
  F. Aharonian et al. (The HEGRA Collaboration),
  Astronomy and Astrophysics 349, 29-44 (1999)
  Preprint: astro-ph/9901284
   
• The time averaged TeV energy spectrum of Mkn 501 of the extraordinary 1997 outburst as measured with the stereoscopic Cherenkov telescope system of HEGRA
  F.A. Aharonian et al. (The HEGRA Collaboration),
  Astronomy and Astrophysics 349, 11-28 (1999)
  Preprint: astro-ph/9903386
   
• TeV gamma-ray observations of the Crab and Mkn 501 during moonshine and twilight.
  D. Kranich et al. (The HEGRA Collaboration),
  Astroparticle Physics 12, 65-74 (1999).
  Paper (PDF)
   
• Phase-resolved TeV Gamma-Ray Characteristics of the Crab and Geminga Pulsars
  F. Aharonian et al. (The HEGRA Collaboration),
  Astronomy and Astrophysics 346, 913-44 (1999).
  Paper (PostScript), Paper (PDF)
   
• The time structure of Cherenkov images generated by TeV gamma-rays and by cosmic rays.
  M. Heß et al. (The HEGRA Collaboration),
  Astroparticle Physics 11, 363-377 (1999).
  Paper (PDF)
   
• Performance of the stereoscopic system of the HEGRA imaging air Cherenkov telescopes: Monte Carlo simulations and observations.
  A. Konopelko et al. (The HEGRA Collaboration),
  Astroparticle Physics 10, 275-289 (1999).
  Paper (PostScript), Paper (PDF)
   
• The cosmic ray proton spectrum determined with the imaging atmospheric Cherenkov technique.
  F.A. Aharonian et al. (The HEGRA Collaboration),
  Phys. Rev. D59, 092003 (1999),
  Paper (PostScript), Paper (PDF)
   
• The temporal characteristics of the TeV gamma-radiation from Mkn 501 in 1997, I: Data from the stereoscopic imaging atmospheric Cherenkov telescope system of HEGRA.
  F.A. Aharonian et al. (The HEGRA Collaboration),
  Astronomy and Astrophysics 342, 69-86 (1999).
  Paper (PostScript), Paper (PDF)
   
• Measurement of the radial distribution of Cherenkov light generated by TeV gamma ray air showers.
  F.A. Aharonian et al. (The HEGRA Collaboration),
  Astroparticle Physics 10, 21-29 (1999).
  Paper (PDF)
   
• Cherenkov light observations with the HEGRA detector at the Roque de los Muchachos observatory.
  R. Mirzoyan et al. (The HEGRA Collaboration),
  New Astronomy Reviews 42, 547-551 (1998).
  Paper (PDF)
   
• Search for gamma-ray bursts above 20 TeV with the HEGRA AIROBICC Cherenkov array.
  L. Padilla et al. (The HEGRA Collaboration *),
  Astronomy and Astrophysics 337, 43-50 (1998).
  Paper (PostScript), Paper (PDF)
   
• Measurement of the flux, spectrum, and variability of TeV gamma-rays from Mkn 501 during a state of high activity.
  F.A. Aharonian et al. (The HEGRA Collaboration),
  Astronomy and Astrophysics 327, L5-L8 (1997).
  Paper (PDF)
   
• Detection of gamma-rays above 1.5 TeV from Mkn 501 .
  S.M. Bradbury et al. (The HEGRA Collaboration),
  Astronomy and Astrophysics 320, L5-L8 (1997).
  Paper (PDF)
   
• First results on the performance of the HEGRA IACT array.
  A. Daum et al. (The HEGRA Collaboration),
  Astroparticle Physics 8, 1-11 (1997)
  Abstract, Paper (PDF)
   
• Search for very high energy gamma radiation from the radio bright region DR4 of the SNR G78.2+2.1.
  C. Prosch et al. (The HEGRA Collaboration *),
  Astronomy and Astrophysics 314, 275-280 (1996).
  Paper (PostScript), Paper (PDF)
   
• Detection of VHE gamma-rays from Mkn 421 with the HEGRA Cherenkov telescopes.
  D. Petry et al. (The HEGRA Collaboration),
  Astronomy and Astrophysics 311, L13-L16 (1996).
  Abstract, Paper (PostScript), Paper (PDF)
   
• An optimized method for the reconstruction of the direction of air showers for scintillator arrays .
  H. Krawczynski et al. (The HEGRA Collaboration *),
  Nuclear Instruments And Methods A 383, 431-440 (1996).
  Abstract, Paper (PDF)
   
• Design and performance of the lead-concrete Geiger tower array within the HEGRA experiment.
  W. Rhode et al. (The HEGRA Collaboration *),
  Nuclear Instruments and Methods A 378, 399-409 (1996).
  Abstract, Paper (PostScript), Paper (PDF)
   
• Methods to determine the angular resolution of the HEGRA extended air shower scintillator array.
  M. Merck et al. (The HEGRA Collaboration *),
  Astroparticle Physics 5, 379-392 (1996).
  Abstract, Paper (PDF)
   
• Stereoscopic imaging of air showers with the first two HEGRA Cherenkov telescopes.
  A. Kohnle et al. (The HEGRA Collaboration),
  Astroparticle Physics, 5, 119-131 (1996).
  Abstract, Paper (PDF)
   
• Detection of gamma rays above 1 TeV from the Crab Nebula by the second HEGRA imaging atmospheric Cherenkov telescope at La Palma.
  A. Konopelko et al. (The HEGRA Collaboration),
  Astroparticle Phyics 4, 199--215 (1996).
  Abstract, Paper (PDF)
   
• Search for isotropic gamma radiation in the cosmological window between 65 and 200 TeV.
  A. Karle et al. (The HEGRA Collaboration *),
  Physics Letters B 347, 161 (1995).
  Abstract, Paper (PDF)
   
• A search for gamma radiation above 24 TeV energy from cosmic point sources.
  A. Karle et al. (The HEGRA Collaboration *),
  Astroparticle Physics 4, 1 (1995).
  Abstract, Paper (PDF)
   
• The first telescope of the HEGRA air Cherenkov imaging telescope array
  R. Mirzoyan, R. Kankanian, F. Krennrich et al. (The HEGRA Collaboration)
  Nuclear Instruments and Methods A 351, 513-526 (1994)
  DOI: 10.1016/0168-9002(94)91381-1
  Abstract, Paper (PDF)