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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

An enigmatic long-lasting gamma-ray burst not accompanied by a bright supernova

Article Abstract:

Gamma-ray bursts (GRBs) are short, intense flashes of soft gamma-rays coming from the distant Universe, while long duration GRBs are believed to originate from the death of massive stars mainly on the basis of a harmful of solid associations between GRBs and supernovae. The deep optical observations of GRB 060614 however shows no emerging supernova with absolute visual magnitude brighter than [M.sub.V]=-13.7, demonstrating that some long-lasting GRBs can either be associated with a very faint supernova or produced by different phenomena.

Author: Mirabel, I.F., Hurley, K., Tagliaferri, G., Chincarini, G., Campana, S., Mangano, V., Covino, S., Antonelli, L.A., Malesani, D., Valle, Della M., Panagia, N., Testa, V., Fugazza, D., D'Avanzo, P.., Pellizza, L.J., Piranomonte, S., Stella, L.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
United Kingdom, Supergiant stars

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The association of GRB 060218 with a supernova and the evolution of the shock wave

Article Abstract:

The gamma-ray burst (GRB) GRB 060218 and its association with supernova SN 2006aj are observed, whereby in addition to the classical non-thermal emission, GRB 060218 reveals a thermal component in its X-ray spectrum, which cools and shifts into the optical/ultraviolet band with time. These features are concluded to be due to the break-out of a shock wave caused by the directly observed explosion of the supernova, indicating that the progenitor of GRB 060218 was most probably a Wolf-Rayet star.

Author: Gehrels, N., Sakamoto, T., Brown, P., Osborne, J.P., Barthelmy, S.D., Cummings, J.R., Cominsky, L.R., Cusumano, G., Roming, P.W.A., Tagliaferri, G., Chincarini, G., Nousek, J.A., Romano, P., O'Brien, P.T., Burrows, D.N., Page, M., Angelini, L., Giommi, P., Moretti, A., Kennea, J.A., Meszaros, P., Campana, S., Mason, K.O., Boyd, P.T., Mangano, V., Marshall, F.E., Wells, A.A., White, N.E., Zhang, B., Palmer, D.M., Blustin, A.J., Valle, M. Della, Malesani, D., Waxman, E., Dai, Z.G., Immler, S., Page, K.L., Godet, O., Krimm, H.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
Observations, Gamma rays, Shock waves

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An origin for short gamma-ray bursts unassociated with current star formation

Article Abstract:

The X-ray localization of a short burst (GRB 050724) with unusual gamma-ray and X-ray properties is reported.The results show that an alternative source of bursts the colescence of binary systems of neutron stars or a neutron star-black hole pair are the progenitors of short bursts.

Author: Gehrels, N., Sakamoto, T., Patel, S., Kobayashi, S., Kouveliotou, C., Kaneko, Y., Sarazin, C.L., Barthelmy, S.D., Cummings, J.R., Goad, M., Tagliaferri, G., Chincarini, G., Nousek, J.A., Romano, P., O'Brien, P.T., Burrows, D.N., Giommi, P., Moretti, A., Kennea, J.A., Meszaros, P., Campana, S., Wijers, R.A.M.J., Grupe, D., D'Avanzo, P., Vaughan, S., Melandri, A., Covino, S., Zhang, B., Antonelli, L.A., King, A., Davies, M.B.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2005
United States, Black holes (Astronomy), Neutron stars, Properties

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Subjects list: Research, Supernovae, Supernovas, Astronomical research
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