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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

A water-vapour giga-maser in the active galaxy TXFS2226-184

Article Abstract:

The presence of a water maser in the galaxy TXFS2226-184 paves the way for determining the distances to galaxies outside the usual distance ladder based on the Hubble constant. Water masers, which exist only in regions with a lot of molecular gas, are a good means to detect active galactic nuclei that are powered by gas falling into a massive black hole. The strength of the emission from the water giga-maser in TXFS2226-184 supports a theory of maser pumping that permits the detection of masers from larger distances.

Author: Codella, Claudio, Koekemoer, Anton M., Henkel, Christian, Greenhill, Lincoln J., Dey, Arjun, van Breugel, Wil, Antonucci, Robert
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
Measurement, Galaxies, Extragalactic distances

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Infall of gas as the formation mechanism of stars up to 20 times more massive than the sun

Article Abstract:

Observations of an ammonia line towards a high-mass star forming region located at a distance of G24.78).08 is reported. It is concluded that the gas is falling inwards towards a very young star in line with theoretical predictions of non-spherical accretion.

Author: Testi, Leonardo, Beltran, Maria T., Olmi, Luca, Cesaroni, Riccardo, Codella, Claudio, Furuya, Ray S.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
United Kingdom, Star formation

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A resolved outflow of matter from a brown dwarf

Article Abstract:

Spectro-astrometric data that spatially resolve an outflow from a brown dwarf is reported. The result suggests that the outflow mechanism is universal and relevant to the formation of planets.

Author: Ray, Thomas P., Whelan, Emma T., Bacciotti, Francesca, Natta, Antonella, Testi, Leonardo, Randich, Sofia
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2005
United States, Science & research, Research, Discovery and exploration, Brown dwarfs, Dwarf stars, Astrometry

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