Astrophys. J., 629, 654-666 (2005/August-3)
Discovery of a large ∼200 kpc gaseous nebula at z ~ 2.7 with the Spitzer Space Telescope.
DEY A., BIAN C., SOIFER B.T., BRAND K., BROWN M.J.I., CHAFFEE F.H., LE FLOC'H E., HILL G., HOUCK J.R., JANNUZI B.T., RIEKE M., WEEDMAN D., BRODWIN M. and EISENHARDT P.
Abstract (from CDS):
We report the discovery of a very large, spatially extended Lyα-emitting nebula at z=2.656 associated with a luminous mid-infrared source. The bright mid-infrared source (F24µm=0.86 mJy) was first detected in observations made using the Spitzer Space Telescope. Existing broadband imaging data from the NOAO Deep Wide-Field Survey revealed the mid-infrared source to be associated with a diffuse, spatially extended, optical counterpart in the BWband. Spectroscopy and further imaging of this target reveals that the optical source is an almost purely line-emitting nebula with little, if any, detectable diffuse continuum emission. The Lyα nebula has a luminosity of LLyα~1.7x1044 ergs/s and an extent of at least 20" (160 kpc). Its central ~8" shows an ordered, monotonic velocity profile; interpreted as rotation, this region encloses a mass M~6x1012 M☉. Several sources lie within the nebula. The central region of the nebula shows narrow (~365 km/s) emission lines of C IV and He II. The mid-infrared source is a compact object lying within the nebula but offset from the center by a projected distance of ~2".5 (20 kpc), and likely to be an enshrouded AGN. A young star-forming galaxy lies near the northern end of the nebula. We suggest that the nebula is a site of recent multiple galaxy and AGN formation, with the spatial distribution of galaxies within the nebula perhaps tracking the formation history of the system.
Galaxies: Formation - Galaxies: High-Redshift - Galaxies: Starburst - ISM: H II Regions
[DBS2005] SST24 JHHMMSS.s+DDMMSS N=1. [DBS2005] Galaxy A (Nos A-B).
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