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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

Discovery of very-high-energy gamma-rays from the Galatic Centre ridge

Article Abstract:

The source of Galactic cosmic rays originate in the shock waves of expanding supernova remnants and their observations were carried out with the High Energy Stereoscopic Systems, a system of four imaging atmospheric-Cherenkov telescopes. The gamma-ray flux was found to approximately trace the density of interstellar gas, illustrating that the flux of cosmic rays is roughly constant throughout the Galaxy.

Author: Goret, P., Akhperjanian, A.G., Boisson, C., Chadwick, P.M., Fontaine, G., Gallant, Y.A., Funk, S., Giebels, B., Espigat, P., Feinstein, F., Degrange, B., Costamante, L., Cornils, R., Aharonian, F., Bazer-Bachi, A.R., Beilicke, M., Benbow, W., Berge, D., Bernlohr, K., Bolz, O., Borrel, V., Braun, I., Breitling, F., Brown, A.M., Chounet, L.-M., Dickinson, H.J., Djannati-Atai, A., Drury, L. O'C., Dubus, G., Emmanoulopoulos, D., Fuchs, Y., Gillessen, S., Glicenstein, J.F., Hadjichristidis, C., Hauser, D., Hauser, M., Heinzelmann, G., Henri, G., Hermann, G., Hinton, J.A.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
Usage, Cosmic rays, Supernova remnants, Space telescopes

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High-energy particle acceleration in the shell of a supernova remnant

Article Abstract:

The supernova remnant (SNR) RX J1713.7-3946 that was discovered by ROSAT in the X-ray spectrum and later claimed as a source of high-energy gamma rays of TeV energies is reported. A TeV gamma-ray image of the SNR the spatially resolved remnant has a shell morphology similar to that seen in X-rays that demonstrates that very-high-energy particles are accelerated there.

Author: Fleury, P., Aharonian, F.A., Chitnis, V.R., Goret, P., Konelko, A., Ouchrif, M., Akhperjanian, A.G., Bernlohr, K.; Boiz, O., Boisson, C., Chadwick, P.M., Fontaine, G., Gallant, Y.A., Funk, S., Giebels, B., Gillesen, S., Espigat, P., Feinstein, F., Degrange, B., Atai, A.Djannati, Drury, L.O'C, Ergin, T., Chounet, L.M., Costamante, L., Cornils, R.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2004
Supernovae, Supernovas

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A low level of extragalactic background light as revealed by gamma-rays from blazars

Article Abstract:

The discovery of gamma-ray emission from the blazars H 2356-309 and 1ES 1101- 232, at redshifts z=0.165 and z= 0.186 are reported. An alternative approach is the study of the absorption features imprinted on the gamma-ray spectra of distant extragalactic objects by interactions of photons with background light photons.

Author: Goret, P., Akhperjanian, A.G., Boisson, C., Chadwick, P.M., Fontaine, G., Gallant, Y.A., Giebels, B., Espigat, P., Feinstein, F., Degrange, B., Costamante, L., Cornils, R., Aharonian, F., Bazer-Bachi, A.R., Berge, D., Bernlohr, K., Bolz, O., Brown, A.M., Chounet, L.-M., Dickinson, H.J., Dubus, G., Emmanoulopoulos, D., Fuchs, Y., Gillessen, S., Glicenstein, J.F., Hauser, D., Hauser, M., Heinzelmann, G., Henri, G., Hinton, J.A., Beilicke M., Borrel V., Braun I., Breitling F., Djannati-Atai A., Drury, L.O'C., Funk S., Hadjichristidis C., Hermann G.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
Photons, Red shift, Redshift

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Subjects list: Research, United States, Gamma rays
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