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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

Discovery of a new population of high-energy gamma-ray sources in the Milky Way

Article Abstract:

A cluster of around 20 faint point sources has been identified north of the Galactic Centre, which belongs to a wider class of faint objects at mid-latitudes. This research used data from the third source catalogue of the Energetic Gamma Ray Experiment Telescope on board the Compton Gamma Ray Observatory. It was established that low-latitude and mid-latitude source populations have different intensity distributions, with low-latitude sources being dominated by bright sources while mid-latitude sources are mainly weak. The Gould belt has an enhanced concentration of massive stars and molecular gas concentrations, and it is therefore speculated that the gamma-rays from the mid-latitude sources are produced in these two types of objects.

Author: Gehrels, N., Macomb, D.J., Bertsch, D.L., Thompson, D.J., Hartman, R.C.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000

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Pulsed high-energy gamma-rays from the radio pulsar PSR1706-44

Article Abstract:

PSR1706-44 is the fourth radio pulsar to be identified as a source of pulsed gamma-radiation. PSR1706-44's gamma rays, measured at more than 100 MeV in energy and with a pulse period of 102 minutes, are emitted as one broad peak rather than as two narrow peaks as with the other three radio pulsars. The geometry of the magnetic and rotation axes and the line of sight probably accounts for this difference. Further research on gamma-radiation emissions from these pulsars is needed since such radiation comprises at least 1% of total neutron-star spin-down energy.

Author: Bertsch, D.L., Thompson, D.J., Hartman, R.C., Lin, Y.C., Lyne, A.G., Manchester, R.N., Kanbach, G., Arzoumanian, Z., Brazier, K.T.S., D'Amico, N., Fichtel, C.E., Fierro, J.M., Hunter, S.D., Johnston, S., Kaspi, V.M., Kniffen, D.A., Mattox, J.R., Mayer-Hasselwander, H.A., Michelson, P.F., Montigny, C. v., Nel, H.I., Nice, D., Nolan, P.L., Pinkau, K., Rothermel, H., Schneid, E.J., Sommer, M., Sreekumar, P., Taylor, J.H.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
Pulsars

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Huge explosion in the early Universe

Article Abstract:

Gamma-and X-ray observations of the most distant gamma-ray bursts (GRB) ever observed, whose redshift (z) of 6.29 means that his explosion happened 12.8 billion years ago, corresponding to a time when the Universe was just 890 million years old, close to the reionization era are described. It means that not only did stars form in this short period of time after the Big Bang, but also that enough time had elapsed for them to evolve and collapse into black holes.

Author: Gehrels, N., Sakamoto, T., Osborne, J.P., Hurley, K., Fenimore, E.E., Goad, M., Cominsky, L.R., Cusumano, G., Roming, P.W.A., Tagliaferri, G., Chincarini, G., Nousek, J.A., Burrows, D.N., Angelini, L., Kennea, J.A., Meszaros, P., Campana, S., Gronwall, C., Mason, K.O., Boyd, P.T., Mangano, V., White, N.E., Zhang, B., Panaitescu, A., La Parola, V., Mineo, T., Barthelemy, S.D., Beardmore, A.P., Glommi, P., Marshall, F., Palmer, D.M., Wells, A.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
Science & research, Red shift, Redshift

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Subjects list: Research, Gamma ray astronomy, Observations
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