Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-03-28
Astrophys.J.592:755-766,2003
Astronomy and Astrophysics
Astrophysics
36 Pages, including 8 Postscript figures. Accepted for publication in the Astrophysical Journal
Scientific paper
10.1086/375619
We report deep Keck narrow-band Lya images of the luminous z > 3 radio galaxies 4C 41.17, 4C 60.07, and B2 0902+34. The images show giant, 100-200 kpc scale emission line nebulae, centered on these galaxies, which exhibit a wealth of morphological structure, including extended low surface brightness emission in the outer regions, radially directed filaments, cone-shaped structures and (indirect) evidence for extended Lya absorption. We discuss these features within a general scenario where the nebular gas cools gravitationally in large Cold Dark Matter (CDM) halos, forming stars and multiple stellar systems. Merging of these ``building'' blocks triggers large scale starbursts, forming the stellar bulges of massive radio galaxy hosts, and feeds super-massive black holes which produce the powerful radio jets and lobes. The radio sources, starburst superwinds and AGN radiation then disrupt the accretion process limiting galaxy and black hole growth, and imprint the observed filamentary and cone-shaped structures of the Lya nebulae.
Bland-Hawthorn Joss
Breugel Wil van
de Vries Wim
Dey Arjun
Dopita Michael
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