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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

Suppression of star formation in early-type galaxies by feedback from supermassive black holes

Article Abstract:

The ultraviolet emissions of massive early-type galaxies are observed and analyzed by deriving an empirical relation for a critical black-hole mass above which the outflows from these black holes suppress star formation in their hosts by heating and expelling all available cold gas. Results show that supermassive black holes are negligible in mass compared to their hosts but seem to play a critical role in the star formation history of galaxies.

Author: Schawinski, Kevin, Young-Wook Lee, Madore, Barry, Milliard, Bruno, Rich, Michael R., Szalay, Alex, Khochfar, Sadegh, Neff, Susan, Schirninovich, David, Seibert, Mark, Small, Todd, Wyder, Ted K., Bianchi, Luciana, Donas, Jose, Heckman, Tim, Kaviraj, Sugata, Chris, Martin D., Morrissey, Patrick, Sukyoung K. Yi, Forster, Karl, Friedman, Peter G., Boselli, Alessandro, Barlow, Tom, Conrow, Tim
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
New York, Analysis, Ultraviolet radiation, Star formation

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The magnetic nature of disk accretion onto black holes

Article Abstract:

An X-ray-absorbing wind discovered in an observation of the stellar-mass black hole binary GRO J1655-40 is reported, which must be powered by a magnetic process that can also drive accretion through the disk. The results provide a rare and crucial insight into the nature of the processes that drive disc accretion in black holes.

Author: Wijnands, Rudy, van der Klis, Michiel, Miller, Jon M., Raymond, John, Fabian, Andy, Steeghs, Danny, Homan, Jeroen, Reynolds, Chris
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006

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How to make a massive star

Article Abstract:

The origin of high mass stars is described by applying two competing theories namely accretion and merger. Observation of two stellar systems suggests that the accretion model has a weightier claim than its rival merger model.

Author: Whitney, Barbara A.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2005
Accretion disks

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Subjects list: Research, Observations, Black holes (Astronomy), Stars, Stellar mass, United States
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