Professor Paula Chadwick's Outputs (10)

The detection of Fermi AGN above 100 GeV using clustering analysis (2015)
Journal Article
Armstrong, T., Brown, A. M., Chadwick, P., & Nolan, S. (2015). The detection of Fermi AGN above 100 GeV using clustering analysis. Monthly Notices of the Royal Astronomical Society, 452(3), 3159-3166. https://doi.org/10.1093/mnras/stv1398

The density-based clustering algorithm DBSCAN has been applied to the Fermi Large Area Telescope (LAT) data set of Eγ ≥ 100 GeV events with |b| > 10°, in order to search for new very high energy (VHE) γ-ray sources. The clustering analysis returned 4... Read More about The detection of Fermi AGN above 100 GeV using clustering analysis.

γ-ray observations of extraterrestrial neutrino track events (2015)
Journal Article
Brown, A. M., Adams, J., & Chadwick, P. M. (2015). γ-ray observations of extraterrestrial neutrino track events. Monthly Notices of the Royal Astronomical Society, 451(1), 323-331. https://doi.org/10.1093/mnras/stv899

In this paper we report the results of a γ-ray study of IceCube's extraterrestrial neutrino candidates detected as track-like events. Using 70 months of Fermi-Large Area Telescope (LAT) observations, a likelihood analysis of all 1–300 GeV photons wit... Read More about γ-ray observations of extraterrestrial neutrino track events.

H.E.S.S. reveals a lack of TeV emission from the supernova remnant Puppis A (2015)
Journal Article
Collaboration, H., Abramowski, A., Aharonian, F., Ait Benkhali, F., Akhperjanian, A., Angüner, E., …Zechlin, H. (2015). H.E.S.S. reveals a lack of TeV emission from the supernova remnant Puppis A. Astronomy & Astrophysics, 575, https://doi.org/10.1051/0004-6361/201424805

Context. Puppis A is an interesting ~4 kyr-old supernova remnant (SNR) that shows strong evidence of interaction between the forward shock and a molecular cloud. It has been studied in detail from radio frequencies to high-energy (HE, 0.1−100 GeV) γ-... Read More about H.E.S.S. reveals a lack of TeV emission from the supernova remnant Puppis A.

The 2012 Flare of PG 1553+113 Seen with H.E.S.S. and Fermi-LAT (2015)
Journal Article
Abramowski, A., Aharonian, F., Ait Benkhali, F., Akhperjanian, A., Angüner, E., Backes, M., …Zechlin, H. (2015). The 2012 Flare of PG 1553+113 Seen with H.E.S.S. and Fermi-LAT. Astrophysical Journal, 802(1), https://doi.org/10.1088/0004-637x/802/1/65

Very high energy (VHE, E > 100 GeV) γ-ray flaring activity of the high-frequency peaked BL Lac object PG 1553+113 has been detected by the H.E.S.S. telescopes. The flux of the source increased by a factor of 3 during the nights of 2012 April 26 and 2... Read More about The 2012 Flare of PG 1553+113 Seen with H.E.S.S. and Fermi-LAT.

Constraints on an Annihilation Signal from a Core of Constant Dark Matter Density around the Milky Way Center with H.E.S.S (2015)
Journal Article
Abramowski, A., Aharonian, F., Ait Benkhali, F., Akhperjanian, A., Angüner, E., Backes, M., …Zechlin, H. (2015). Constraints on an Annihilation Signal from a Core of Constant Dark Matter Density around the Milky Way Center with H.E.S.S. Physical Review Letters, 114(8), https://doi.org/10.1103/physrevlett.114.081301

An annihilation signal of dark matter is searched for from the central region of the Milky Way. Data acquired in dedicated on-off observations of the Galactic center region with H.E.S.S. are analyzed for this purpose. No significant signal is found i... Read More about Constraints on an Annihilation Signal from a Core of Constant Dark Matter Density around the Milky Way Center with H.E.S.S.

H.E.S.S. detection of TeV emission from the interaction region between the supernova remnant G349.7+0.2 and a molecular cloud (2015)
Journal Article
Collaboration, H., Abramowski, A., Aharonian, F., Ait Benkhali, F., Akhperjanian, A., Angüner, E., …Zechlin, H. (2015). H.E.S.S. detection of TeV emission from the interaction region between the supernova remnant G349.7+0.2 and a molecular cloud. Astronomy & Astrophysics, 574, Article A100. https://doi.org/10.1051/0004-6361/201425070

G349.7+0.2 is a young Galactic supernova remnant (SNR) located at the distance of 11.5 kpc and observed across the entire electromagnetic spectrum from radio to high energy (HE; 0.1 GeV <E< 100 GeV) γ-rays. Radio and infrared observations indicate th... Read More about H.E.S.S. detection of TeV emission from the interaction region between the supernova remnant G349.7+0.2 and a molecular cloud.

Probing the gamma-ray emission from HESS J1834-087 using H.E.S.S. and Fermi LAT observations (2015)
Journal Article
Collaboration, H., Abramowski, A., Aharonian, F., Ait Benkhali, F., Akhperjanian, A., Angüner, E., …Uchiyama, Y. (2015). Probing the gamma-ray emission from HESS J1834-087 using H.E.S.S. and Fermi LAT observations. Astronomy & Astrophysics, 574, Article A27. https://doi.org/10.1051/0004-6361/201322694

Aims. Previous observations with the High Energy Stereoscopic System (H.E.S.S.) have revealed an extended very-high-energy (VHE; E> 100 GeV) γ-ray source, HESS J1834−087, coincident with the supernova remnant (SNR) W41. The origin of the γ-ray emissi... Read More about Probing the gamma-ray emission from HESS J1834-087 using H.E.S.S. and Fermi LAT observations.

The exceptionally powerful TeV γ-ray emitters in the Large Magellanic Cloud (2015)
Journal Article
Collaboration, H., Abramowski, A., Aharonian, F., Ait Benkhali, F., Akhperjanian, A., Angüner, E., …Zechlin, H. (2015). The exceptionally powerful TeV γ-ray emitters in the Large Magellanic Cloud. Science, 347(6220), 406-412. https://doi.org/10.1126/science.1261313

The Large Magellanic Cloud, a satellite galaxy of the Milky Way, has been observed with the High Energy Stereoscopic System (H.E.S.S.) above an energy of 100 billion electron volts for a deep exposure of 210 hours. Three sources of different types we... Read More about The exceptionally powerful TeV γ-ray emitters in the Large Magellanic Cloud.

Discovery of the VHE gamma-ray source HESS J1832-093 in the vicinity of SNR G22.7-0.2 (2015)
Journal Article
Collaboration, H., Abramowski, A., Acero, F., Aharonian, F., Ait Benkhali, F., Akhperjanian, A., …Zechlin, H. (2015). Discovery of the VHE gamma-ray source HESS J1832-093 in the vicinity of SNR G22.7-0.2. Monthly Notices of the Royal Astronomical Society, 446(2), 1163-1169. https://doi.org/10.1093/mnras/stu2148

The region around the supernova remnant (SNR) W41 contains several TeV sources and has prompted the HESS Collaboration to perform deep observations of this field of view. This resulted in the discovery of the new very high energy (VHE) source HESS J1... Read More about Discovery of the VHE gamma-ray source HESS J1832-093 in the vicinity of SNR G22.7-0.2.

The high-energy γ-ray emission of AP Librae (2015)
Journal Article
Collaboration, H., Abramowski, A., Aharonian, F., Ait Benkhali, F., Akhperjanian, A., Angüner, E., …Horan, D. (2015). The high-energy γ-ray emission of AP Librae. Astronomy & Astrophysics, 573, Article A31. https://doi.org/10.1051/0004-6361/201321436

The γ-ray spectrum of the low-frequency-peaked BL Lac (LBL) object AP Librae is studied, following the discovery of very-high-energy (VHE; E> 100 GeV) γ-ray emission up to the TeV range by the H.E.S.S. experiment. This makes AP Librae one of the few... Read More about The high-energy γ-ray emission of AP Librae.