Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-02-26
Astrophys.J.701:955-963,2009
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
11 pages, 5 figures. Accepted version, incorporating referee comments, including changes to title, abstract, figures, and disc
Scientific paper
10.1088/0004-637X/701/2/955
High signal-to-noise, representative spectra of star-forming galaxies at z~2, obtained via stacking, reveal a high-velocity component underneath the narrow H-alpha and [NII] emission lines. When modeled as a single Gaussian, this broad component has FWHM > 1500 km/s; when modeled as broad wings on the H-alpha and [NII] features, it has FWHM > 500 km/s. This feature is preferentially found in the more massive and more rapidly star-forming systems, which also tend to be older and larger galaxies. We interpret this emission as evidence of either powerful starburst-driven galactic winds or active supermassive black holes. If galactic winds are responsible for the broad emission, the observed luminosity and velocity of this gas imply mass outflow rates comparable to the star formation rate. On the other hand, if the broad line regions of active black holes account for the broad feature, the corresponding black holes masses are estimated to be an order of magnitude lower than those predicted by local scaling relations, suggesting a delayed assembly of supermassive black holes with respect to their host bulges.
Armus Lee
Bouché Nicolas
Buschkamp Peter
Cimatti Andrea
Cresci Giovanni
No associations
LandOfFree
The SINS Survey: Broad Emission Lines in High-Redshift Star-Forming Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The SINS Survey: Broad Emission Lines in High-Redshift Star-Forming Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The SINS Survey: Broad Emission Lines in High-Redshift Star-Forming Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-571164