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Numrering	Referens	Omslagsbild	Hitta
1.	Aliu, E., et al. (författare) Discovery of TeV Gamma-Ray Emission from CTA 1 by VERITAS 2013 Ingår i: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 764:1 Tidskriftsartikel (refereegranskat)abstract We report the discovery of TeV gamma-ray emission coincident with the shell-type radio supernova remnant (SNR) CTA 1 using the VERITAS gamma-ray observatory. The source, VER J0006+729, was detected as a 6.5 standard deviation excess over background and shows an extended morphology, approximated by a two-dimensional Gaussian of semimajor (semiminor) axis 030 (024) and a centroid 5' from the Fermi gamma-ray pulsar PSR J0007+7303 and its X-ray pulsar wind nebula (PWN). The photon spectrum is well described by a power-law dN/dE = N 0(E/3 TeV)–Γ, with a differential spectral index of Γ = 2.2 ± 0.2stat ± 0.3sys, and normalization N 0 = (9.1 ± 1.3stat ± 1.7sys) × 10–14 cm–2 s–1 TeV–1. The integral flux, F γ = 4.0 ×10–12 erg cm–2 s–1 above 1 TeV, corresponds to 0.2% of the pulsar spin-down power at 1.4 kpc. The energetics, colocation with the SNR, and the relatively small extent of the TeV emission strongly argue for the PWN origin of the TeV photons. We consider the origin of the TeV emission in CTA 1.
2.	Aliu, E., et al. (författare) Observations of the Unidentified Gamma-Ray Source TeV J2032+4130 by VERITAS 2014 Ingår i: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 783 Tidskriftsartikel (refereegranskat)abstract TeV J2032+4130 was the first unidentified source discovered at very high energies (VHEs; E > 100 GeV), with no obvious counterpart in any other wavelength. It is also the first extended source to be observed in VHE gamma rays. Following its discovery, intensive observational campaigns have been carried out in all wavelengths in order to understand the nature of the object, which have met with limited success. We report here on a deep observation of TeV J2032+4130 based on 48.2 hr of data taken from 2009 to 2012 by the Very Energetic Radiation Imaging Telescope Array System experiment. The source is detected at 8.7 standard deviations (σ) and is found to be extended and asymmetric with a width of 9.'5 ± 1.'2 along the major axis and 4.'0 ± 0.'5 along the minor axis. The spectrum is well described by a differential power law with an index of 2.10 ± 0.14stat ± 0.21sys and a normalization of (9.5 ± 1.6stat ± 2.2sys) × 10–13 TeV–1 cm–2 s–1 at 1 TeV. We interpret these results in the context of multiwavelength scenarios which particularly favor the pulsar wind nebula interpretation.

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Typ av publikation: tidskriftsartikel (2)

Typ av innehåll: refereegranskat (2)

Författare/redaktör: Hughes, G. (2); Pohl, M. (2); Benbow, W. (2); Bugaev, V. (2); Connolly, M. P. (2); Cui, W. (2); visa fler...; Falcone, A. (2); Feng, Q. (2); Finley, J. P. (2); Fortson, L. (2); Furniss, A. (2); Griffin, S. (2); Grube, J. (2); Holder, J. (2); Humensky, T. B. (2); Kaaret, P. (2); Lang, M. J. (2); Moriarty, P. (2); Mukherjee, R. (2); Ong, R. A. (2); Otte, A. N. (2); Quinn, J. (2); Ragan, K. (2); Reynolds, P. T. (2); Roache, E. (2); Sembroski, G. H. (2); Staszak, D. (2); Tyler, J. (2); Wakely, S. P. (2); Weinstein, A. (2); Williams, D. A. (2); Zitzer, B. (2); Majumdar, P. (2); Ciupik, L. (2); Dumm, J. (2); Errando, M. (2); Gillanders, G. H. (2); Kieda, D. (2); Maier, G. (2); McCann, A. (2); Telezhinsky, I. (2); Prokoph, Heike (2); Perkins, J. S. (2); Reyes, L. C. (2); Aliu, E. (2); Aune, T. (2); Beilicke, M. (2); Buckley, J. H. (2); Galante, N. (2); Gyuk, G. (2); visa färre...

Lärosäte: Linnéuniversitetet (2)

Språk: Engelska (2)

Forskningsämne (UKÄ/SCB): Naturvetenskap (2)

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