Exploring a SNR/molecular cloud association within HESS J1745-303 (2008)
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
Discovery of VHE gamma-rays from the high-frequency-peaked BL lacertae object RGB J0152+017 (2008)
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
HESS upper limits for Kepler's supernova remnant (2008)
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
HESS observations and VLT spectroscopy of PG 1553+113 (2008)
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
Upper limits from HESS active galactic nuclei observations in 2005-2007 (2008)
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
HESS very-high-energy gamma-ray sources without identified counterparts (2008)
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
Chandra and HESS observations of the supernova remnant CTB 37B (2008)
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
Simultaneous HESS and Chandra observations of Sagitarius A during an X-ray flare (2008)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Behera, B., Benbow, Wystan, ...
The rapidly varying (~10 min timescale) non-thermal X-ray emission observed from Sgr A implies that particle acceleration is occuring close to the event horizon of the supermassive black hole. The...
Discovery of a VHE gamma-ray source coincident with the supernova remnant CTB 37A (2008)
Aharonian, Felix, Akhperjanian, A. G., Barres De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
Aims. The supernova remnant (SNR) complex CTB 37 is an interesting candidate for observations with very high energy (VHE) -ray telescopes such as HESS. In this region, three SNRs are seen. One of...
Aharonian, Felix, Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, Wystan, ...
We present deep H.E.S.S. observations of the supernova remnant (SNR) RX J1713.7-3946. Combining data of three years - from 2003 to 2005 - we obtain significantly increased statistics and energy...
Discovery of VHE gamma-rays from the distant BL Lacertae 1ES0347-121 (2007)
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
New constraints on the mid-IR EBL from the HESS discovery of VHE gamma-rays from 1ES 0229+200 (2007)
Aharonian, F., Akhperjanian, A. G., De Almeida, U. B., Bazer-Bachi, A. R., Behera, B., Beilicke, M., ...
Discovery of two candidate pulsar wind nebulae in very-high-energy gamma rays (2007)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Behera, B., Beilicke, M., Benbow, W., ...
An exceptional very high energy gamma-ray flare of PKS 2155-304 (2007)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Behera, B., Beilicke, M., Benbow, W., ...
Discovery of a point-like very-high-energy gamma-ray source in Monoceros (2007)
Aharonian, F. A., Akhperjanian, A. G., Bazer-Bachi, A. R., Behera, B., Beilicke, M., Benbow, W., ...
Search for pulsed VHE gamma-ray emission from young pulsars with HESS (2007)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
First ground-based measurement of atmospheric Cherenkov light from cosmic rays (2007)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
H.E.S.S. discovers VHE gamma-rays from the BL Lac RGB J0152+017 (2007)
Nedbal, Dalibor, Benbow, Wystan, Costamante, Luigi, Giebels, Berrie, Kaufmann, Sarah, Raue, Martin, ...
We report on the H.E.S.S. discovery of VHE gamma-rays from the BL Lac object RGB J0152+017. H.E.S.S. observed the source from Oct 30 to Nov 14, 2007 for a total of ~14h live time. A preliminary...
The H.E.S.S. survey of the Inner Galaxy in very-high-energy gamma-rays (2006)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
We report on a survey of the inner part of the Galactic Plane in very high energy gamma-rays, with the H.E.S.S. Cherenkov telescope system. The Galactic Plane between +-30deg in longitude and +-3deg...
Discovery of very-high-energy gamma-rays from the Galactic Centre ridge (2006)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
The source of Galactic cosmic rays (with energies up to 1015 eV) remains unclear, although it is widely believed that they originate in the shock waves of expanding supernova remnants1, 2. At present...
Evidence for VHE gamma-ray emission from the distant BL Lac PG 1553+113 (2006)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
The high-frequency peaked BL Lac PG 1553+113 was observed in 2005 with the HESS stereoscopic array of imaging atmospheric-Cherenkov telescopes in Namibia. Using the HESS standard analysis, an excess...
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
The Vela supernova remnant (SNR) is a complex region containing a number of sources of non-thermal radiation. The inner section of this SNR, within 2 degrees of the pulsar PSR B0833-45, has been...
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
We present results from deep observations of the Galactic shell-type supernova remnant (SNR) RX J1713.7-3946 (also known as G347.3-0.5 ) conducted with the complete HESS array in 2004....
A low level of extragalactic background light as revealed by gamma-rays from blazars (2006)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
The diffuse extragalactic background light consists of the sum of the starlight emitted by galaxies through the history of the Universe, and it could also have an important contribution from the...
Discovery of the two wings of the Kookaburra complex in VHE gamma-rays with H.E.S.S (2006)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
Aims. Search for Very High Energy gamma-ray emission in the Kookaburra complex through observations with the H.E.S.S. array. Methods. Stereoscopic imaging of Cherenkov light emission of the gamma-ray...
Observations of the Crab nebula with HESS (2006)
Aharonian, Felix, Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, Wystan, ...
Context.The Crab nebula was observed with the HESS stereoscopic Cherenkov-telescope array between October 2003 and January 2005 for a total of 22.9 h (after data quality selection). This period of...
Fast Variability of Tera–Electron Volt gamma Rays from the Radio Galaxy M87 (2006)
Aharonian, Felix, Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, Wystan, ...
The detection of fast variations of the tera–electron volt (TeV) (1012 eV) gamma-ray flux, on time scales of days, from the nearby radio galaxy M87 is reported. These variations are about 10 times...
HESS Observations of the Galactic Center Region and Their Possible Dark Matter Interpretation (2006)
Aharonian, Felix, Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, Wystan, ...
The detection of gamma rays from the source HESS J1745-290 in the Galactic Center (GC) region with the High Energy Spectroscopic System (HESS) array of Cherenkov telescopes in 2004 is presented....
Energy dependent gamma-ray morphology in the Pulsar wind nebula HESS J1825-137 (2006)
Aharonian, Felix, Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, Wystan, ...
Detailed morphological and spatially resolved spectral studies reveal the very high-energy (VHE) gamma-ray aspects of this object with unprecedented precision. We confirm previous results obtained in...
Aharonian, Felix, Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, Wystan, Berge, David, ...
The extreme synchrotron BL Lac object H 2356-309, located at a redshift of z = 0.165, was observed from June to December 2004 with a total exposure of 40 h live-time with the HESS (High Energy...
A New Population of Very High Energy Gamma-Ray Sources in the Milky Way (2005)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
Very high energy -rays probe the long-standing mystery of the origin of cosmic rays. Produced in the interactions of accelerated particles in astrophysical objects, they can be used to image cosmic...
Discovery of VHE gamma ray from PKS 2005-489 (2005)
Aharonian, Felix, Akhperjanian, A.G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
The high-frequency peaked BL Lac PKS 2005-489 (z=0.071) was observed in 2003 and 2004 with the HESS stereoscopic array of imaging atmospheric-Cherenkov telescopes in Namibia. A signal was detected at...
H.E.S.S. Observations of PKS 2155-304 (2005)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
The high-frequency peaked BL Lac PKS 2155-304 at redshift z=0.117 has been detected with high significance (~45 ) at energies greater than 160 GeV, using the H.E.S.S. stereoscopic array of imaging...
Search for TeV emission from the region around PSR B1706-44 with the H.E.S.S. experiment (2005)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
The region around PSR B1706-44 has been observed with the HESS imaging atmospheric Cherenkov telescopes in 2003. No evidence for gamma-ray emission in the TeV range was found at the pulsar position...
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
The Supernova Remnant MSH 15-52 has been observed in very high energy (VHE) gamma-rays using the HESS 4-telescope array located in Namibia. A gamma-ray signal is detected at the 25 sigma level during...
Aharonian, F., Akhperjanian, A. G., Borrel, V., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
We report the detection of TeV -rays from the shell-type supernova remnant RX J0852.0-4622 with data of 3.2 h of live time recorded with HESS in February 2004. An excess of (700 ± 60) events from...
Observations of Mkn 421 in 2004 with HESS at large zenith angles (2005)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
Mkn 421 was observed during a high flux state for nine nights in April and May 2004 with the fully operational High Energy Stereoscopic System (HESS) in Namibia. The observations were carried out at...
Upper limits to the SN1006 multi-TeV gamma-ray flux from H.E.S.S. observations (2005)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
Observations of the shell-type supernova remnant SN1006 have been carried out with the HESS system of Cherenkov telescopes during 2003 (18.2 h with two operating telescopes) and 2004 (6.3 h with all...
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
We report the discovery of very-high-energy (VHE) gamma-ray emission of the binary system PSR B1259-63/SS 2883 of a radio pulsar orbiting a massive, luminous Be star in a highly eccentric orbit. The...
Discovery of Very High Energy Gamma Rays Associated with an X-ray Binary (2005)
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
X-ray binaries are composed of a normal star in orbit around a neutron star or stellar-mass black hole. Radio and x-ray observations have led to the presumption that some x-ray binaries called...
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
We report on a possible association of the recently discovered very high-energy gamma-ray source HESS J1825--137 with the pulsar wind nebula (commonly referred to as G 18.0--0.7) of the 2.1 x 104...
Observations of TeV gamma rays from Markarian 501 at large zenith angles (1999)
Chadwick, P M, Lyons, K, McComb, T J L, Orford, K J, Osborne, J L, Rayner, S M, ...
TeV gamma rays from the blazar Markarian 501 have been detected with the University of Durham Mark 6 atmospheric Cerenkov telescope using the imaging technique at large zenith angles. Observations...
Geomagnetic effects on atmospheric Cerenkov images (1999)
Chadwick, P. M., Lyons, K., McComb, T. J. L., Orford, K. J., Osborne, J. L., Rayner, S. M., ...
Atmospheric Cerenkov telescopes are used to detect electromagnetic showers from primary gamma rays of energy ~300 GeV - ~10 TeV and to discriminate these from cascades due to hadrons using the...
Search for very high energy γ-ray emission from the starburst galaxy NGC 253 with H.E.S.S.
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
We present the result of observations of the nearby starburst galaxy NGC 253 with the H.E.S.S. detector in 2003. We find no evidence for very high gamma-ray emission from this object. Gamma-ray...
Serendipitous discovery of the unidentified extended TeV gamma-ray source HESS J1303-631
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
The serendipitous discovery of an unidentified extended TeV gamma-ray source close to the galactic plane named HESS J1303-631 at a significance of 21 standard deviations is reported. The observations...
Multi-wavelength observations of PKS 2155-304 with H.E.S.S
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...
The High Energy Stereoscopic System (H.E.S.S.) has observed the high-frequency peaked BL Lac object PKS2155-304 in 2003 between October 19 and November 26 in Very High Energy (VHE) gamma-rays (E>160...
A search for very high energy gamma-ray emission from the starburst galaxy NGC 253 with H.E.S.S
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
We present the result of 28 hours of observations of the nearby starburst galaxy NGC 253 with the H.E.S.S. detector in 2003. We find no evidence for very high energy gamma-ray emission from this...
Resolving the Extragalactic Background Light with gamma-ray spectra from distant blazars
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...
The diffuse Extragalactic Background Light (EBL) contains unique information about the epochs of formation and the history of evolution of galaxies. Unfortunately, direct measurements are subject to...
3.9 day orbital modulation in the TeV gamma-ray flux and spectrum from the X-ray binary LS 5039
Aharonian, Felix, Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, Wystan, ...
New observations of LS 5039, a High Mass X-ray Binary comprising a massive star and compact object, were carried out with the High Energy Stereoscopic System of Cherenkov Telescopes (H.E.S.S.) in...