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Professor Sam Nolan's Outputs (89)

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.

Simultaneous X-ray and VHE gamma-ray observations of microquasars (2005)
Presentation / Conference Contribution
Chadwick, P., Dickinson, H., Latham, I., Nolan, S., Osborne, J., & Collaboration, H. (2005, December). Simultaneous X-ray and VHE gamma-ray observations of microquasars. Presented at Proceedings of the 29th International Cosmic Ray Conference, Vol 4: OG 2.1, 2.2 \& 2.3 Forsch Zentrum Karsruhe Inst Kernphys; Univ Karlsruhe; Inst Expt Kemphys; Tata Inst Fundamental Res; Int Union Pure \& Appl Phys, HOMI BHABHA MARG, NAVY NAGAR, COLABA, MUMBAI, MH-400005, INDIA

Atmospheric monitoring for the HESS Cherenkov telescope array by transmissometer and LIDAR (2005)
Presentation / Conference Contribution
Brown, A., Chadwick, P., Dickinson, H., Hadjichristidis, C., Latham, I., Le Gallou, R., McComb, T., Nolan, S., Noutsos, A., Orford, K., Osborne, J., Rayner, S., Spangler, D., & Collaboration, H. (2005, December). Atmospheric monitoring for the HESS Cherenkov telescope array by transmissometer and LIDAR. Presented at PROCEEDINGS OF THE 29TH INTERNATIONAL COSMIC RAY CONFERENCE, VOL 5: OG 2.5, 2.6 \& 2.7 Forsch Zentrum Karsruhe Inst Kernphys; Univ Karlsruhe; Inst Expt Kemphys; Tata Inst Fundamental Res; Int Union Pure \& Appl Phys

Active atmospheric calibration for HESS applied to PKS 2155-304 (2005)
Presentation / Conference Contribution
Brown, A., Chadwick, P., Dickinson, H., Hadjichristidis, C., Latham, I., Le Gallou, R., Masterson, C., McComb, T., Nolan, S., Noutsos, A., Orford, K., Rayner, S., Spangler, D., & Collaboration, H. (2005, December). Active atmospheric calibration for HESS applied to PKS 2155-304. Presented at Proceedings of the 29th International Cosmic Ray Conference, Vol 4: OG 2.1, 2.2 \& 2.3 Forsch Zentrum Karsruhe Inst Kernphys; Univ Karlsruhe; Inst Expt Kemphys; Tata Inst Fundamental Res; Int Union Pure \& Appl Phys

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.

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.

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.