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Professor Sam Nolan's Outputs (61)

A detailed spectral and morphological study of the gamma-ray supernovaremnant RX J1713.7-3946 with HESS (2006)
Journal Article
Aharonian, F., Akhperjanian, A., Bazer-Bachi, A., Beilicke, M., Benbow, W., Berge, D., …Wagner, S. (2006). A detailed spectral and morphological study of the gamma-ray supernovaremnant RX J1713.7-3946 with HESS. Astronomy & Astrophysics, 449(1), 223-242. https://doi.org/10.1051/0004-6361%3A20054279

Aims.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. Methods.Detailed morphological and spatially resolved spectr... Read More about A detailed spectral and morphological study of the gamma-ray supernovaremnant RX J1713.7-3946 with HESS.

A low level of extragalactic background light as revealed by big gamma-rays from blazars (2006)
Journal Article
Aharonian, F., Akhperjanian, A., Bazer-Bachi, A., Beilicke, M., Benbow, W., Berge, D., …Wagner, S. (2006). A low level of extragalactic background light as revealed by big gamma-rays from blazars. Nature, 440(7087), 1018-1021. https://doi.org/10.1038/nature04680

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 'first stars', which may have formed before galaxy form... Read More about A low level of extragalactic background light as revealed by big gamma-rays from blazars.

A possible association of the new VHE γ-ray source HESS J1825–137 with the pulsar wind nebula G 18.0–0.7. (2005)
Journal Article
Aharonian, F., Akhperjanian, A., Bazer-Bachi, A., Beilicke, M., Benbow, W., Berge, D., …Wagner, S. (2005). A possible association of the new VHE γ-ray source HESS J1825–137 with the pulsar wind nebula G 18.0–0.7. Astronomy & Astrophysics, 442(3), L25-L29. https://doi.org/10.1051/0004-6361%3A200500180

We report on a possible association of the recently discovered very high-energy γ-ray source HESS J1825–137 with the pulsar wind nebula (commonly referred to as G 18.0–0.7) of the 2.1 × 104 year old Vela-like pulsar PSR B1823–13. HESS J1825–137 was d... Read More about A possible association of the new VHE γ-ray source HESS J1825–137 with the pulsar wind nebula G 18.0–0.7..

A search for very high energy gamma-ray emission from the starburstgalaxy NGC253 with HESS (2005)
Journal Article
Aharonian, F., Akhperjanian, A., Bazer-Bachi, A., Beilicke, M., Benbow, W., Berge, D., …Wagner, S. (2005). A search for very high energy gamma-ray emission from the starburstgalaxy NGC253 with HESS. Astronomy & Astrophysics, 442(1), 177-183. https://doi.org/10.1051/0004-6361%3A20053521

We present the result of 28 h of observations of the nearby starburst galaxy NGC 253 with the HESS$\,$detector in 2003. We find no evidence for very high energy $\gamma$-ray emission from this object. Gamma-ray emission above 400 GeV from NGC 253 had... Read More about A search for very high energy gamma-ray emission from the starburstgalaxy NGC253 with HESS.

Discovery of the binary pulsar PSR B1259-63 in very-high-energy gamma rays around periastron with HESS. (2005)
Journal Article
Aharonian, F., Akhperjanian, A., Aye, K., Bazer-Bachi, A., Beilicke, M., Benbow, W., …Wagner, S. (2005). Discovery of the binary pulsar PSR B1259-63 in very-high-energy gamma rays around periastron with HESS. Astronomy & Astrophysics, 442(1), 1-10. https://doi.org/10.1051/0004-6361%3A20052983

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 observations around the 2004 periastron passag... Read More about Discovery of the binary pulsar PSR B1259-63 in very-high-energy gamma rays around periastron with HESS..

Discovery of very high energy gamma rays associated with an x-ray binary (2005)
Journal Article
Aharonian, F., Akhperjanian, A., Aye, K., Bazer-Bachi, A., Beilicke, M., Benbow, W., …Wagner, S. (2005). Discovery of very high energy gamma rays associated with an x-ray binary. Science, 309(5735), 746-749. https://doi.org/10.1126/science.1113764

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 microquasars behave as scaled-down active galactic nuclei... Read More about Discovery of very high energy gamma rays associated with an x-ray binary.

Detection of TeV γ-ray emission from the shell-type supernova remnant RX J0852.0-4622 with HESS (2005)
Journal Article
Aharonian, F., Akhperjanian, A., Bazer-Bachi, A., Beilicke, M., Benbow, W., Berge, D., …Wagner, S. (2005). Detection of TeV γ-ray emission from the shell-type supernova remnant RX J0852.0-4622 with HESS. Astronomy & Astrophysics, 437(1), L7-L10. https://doi.org/10.1051/0004-6361%3A200500130

We report the detection of TeV $\gamma$-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 ( $700 \pm 60$) events from the whole remnant with a significance of... Read More about Detection of TeV γ-ray emission from the shell-type supernova remnant RX J0852.0-4622 with HESS.

Discovery of extended VHE gamma-ray emission from the asymmetric pulsar wind nebula in MSH 15-52 with HESS (2005)
Journal Article
Aharonian, F., Akhperjanian, A., Aye, K., Bazer-Bachi, A., Beilicke, M., Benbow, W., …Wagner, S. (2005). Discovery of extended VHE gamma-ray emission from the asymmetric pulsar wind nebula in MSH 15-52 with HESS. Astronomy & Astrophysics, 435(1), L17-L20. https://doi.org/10.1051/0004-6361%3A200500105

The Supernova Remnant MSH 15-52 has been observed in very high energy (VHE) γ-rays using the HESS 4-telescope array located in Namibia. A γ-ray signal is detected at the 25 sigma level during an exposure of 22.1 h live time. The image reveals an elli... Read More about Discovery of extended VHE gamma-ray emission from the asymmetric pulsar wind nebula in MSH 15-52 with HESS.

A new population of very high energy gamma-ray sources in the Milky Way (2005)
Journal Article
Aharonian, F., Akhperjanian, A., Aye, K., Bazer-Bachi, A., Beilicke, M., Benbow, W., …Wagner, S. (2005). A new population of very high energy gamma-ray sources in the Milky Way. Science, 307(5717), 1938-1942. https://doi.org/10.1126/science.1108643

Very high energy {gamma}-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 particle accelerators. A first sensitive surv... Read More about A new population of very high energy gamma-ray sources in the Milky Way.

Search for TeV emission from the region around PSR B1706-44 with the HESS experiment (2005)
Journal Article
Aharonian, F., Akhperjanian, A., Aye, K., Bazer-Bachi, A., Beilicke, M., Benbow, W., …Wagner, S. (2005). Search for TeV emission from the region around PSR B1706-44 with the HESS experiment. Astronomy & Astrophysics, 432(1), L9-L12. https://doi.org/10.1051/0004-6361%3A200500008

The region around PSR B1706–44 has been observed with the HESS imaging atmospheric Cherenkov telescopes in 2003. No evidence for γ-ray emission in the TeV range was found at the pulsar position or at the radio arc which corresponds to the supernova r... Read More about Search for TeV emission from the region around PSR B1706-44 with the HESS experiment.

Atmospheric sensing for the H.E.S.S. array (2005)
Presentation / Conference Contribution
Aye, K.-M., Brown, A., Chadwick, P., Hadjichristidis, C., Latham, I., Le Gallou, R., Mc Comb, T., Nolan, S., Noutsos, A., Orford, K., Osborne, J., Rayner, S., & Collaboration, H. (2005, February). Atmospheric sensing for the H.E.S.S. array. Presented at 2nd International Symposium on High Energy Gamma-Ray Astronomy, Heidelberg, Germany

Several atmospheric monitoring instruments have been installed at the H.E.S.S. gamma‐ray observatory in Namibia. Firstly, Heitronics KT19 infrared radiometers, aligned paraxially with the H.E.S.S. telescopes, measure the infrared radiation of the wat... Read More about Atmospheric sensing for the H.E.S.S. array.

H.E.S.S. observations of PKS 2155-304 (2005)
Journal Article
Aharonian, F., Akhperjanian, A., Aye, K., Bazer-Bachi, A., Beilicke, M., Benbow, W., …Wagner, S. (2005). H.E.S.S. observations of PKS 2155-304. Astronomy & Astrophysics, 430(3), 865-875. https://doi.org/10.1051/0004-6361%3A20041853

The high-frequency peaked BL Lac PKS 2155-304 at redshift z=0.117 has been detected with high significance (~45sigma) at energies greater than 160 GeV, using the H.E.S.S. stereoscopic array of imaging air-Cherenkov telescopes in Namibia. A strong sig... Read More about H.E.S.S. observations of PKS 2155-304.

High-energy particle acceleration in the shell of a supernova remnant (2004)
Journal Article
Aharonian, F., Akhperjanian, A., Aye, K., Bazer-Bachi, A., Beilicke, M., Benbow, W., …Wagner, S. (2004). High-energy particle acceleration in the shell of a supernova remnant. Nature, 432(7013), 75-77. https://doi.org/10.1038/nature02960

A significant fraction of the energy density of the interstellar medium is in the form of high-energy charged particles (cosmic rays)1. The origin of these particles remains uncertain. Although it is generally accepted that the only sources capable o... Read More about High-energy particle acceleration in the shell of a supernova remnant.

Calibration of cameras of the H.E.S.S. detector (2004)
Journal Article
Aharonian, F., Akhperjanian, A., Aye, K., Bazer-Bachi, A., Beilicke, M., Benbow, W., …Wagner, S. (2004). Calibration of cameras of the H.E.S.S. detector. Astroparticle Physics, 22(2), 109-125. https://doi.org/10.1016/j.astropartphys.2004.06.006

H.E.S.S.—the high energy stereoscopic system—is a new system of large atmospheric Cherenkov telescopes for GeV/TeV astronomy. Each of the four telescopes of 107 m2 mirror area is equipped with a 960-pixel photomultiplier-tube camera. This paper descr... Read More about Calibration of cameras of the H.E.S.S. detector.

Very high energy gamma rays from the direction of Sagittarius A<SUP>*</SUP> (2004)
Journal Article
Aharonian, F., Akhperjanian, A., Aye, K., Bazer-Bachi, A., Beilicke, M., Benbow, W., …Wagner, S. (2004). Very high energy gamma rays from the direction of Sagittarius A*. Astronomy & Astrophysics, 425(1), L13-L17. https://doi.org/10.1051/0004-6361%3A200400055

We report the detection of a point-like source of very high energy (VHE) -rays coincident within 1' of Sgr A *, obtained with the HESS array of Cherenkov telescopes. The -rays exhibit a power-law energy spectrum with a spectral index of and a flux ab... Read More about Very high energy gamma rays from the direction of Sagittarius A<SUP>*</SUP>.

VHE gamma rays from binary systems (2001)
Presentation / Conference Contribution
Chadwick, P., Chaty, S., Daniel, M., Haswell, C., Kolb, U., McComb, T., McKenny, J., Nolan, S., Norton, A., Orford, K., Osborne, J., & Rayner, S. (2001, December). VHE gamma rays from binary systems. Presented at HIGH ENERGY GAMMA-RAY ASTRONOMY Max Planck Inst Kernphys; DFG; Int Union Pure \& Appl Phys, 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA