Mathematics – Logic
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21922902k&link_type=abstract
American Astronomical Society, AAS Meeting #219, #229.02
Mathematics
Logic
Scientific paper
We present new results on the regulation of star formation in galaxies, specifically the study of outflowing galactic-scale winds at z = 1. With the goal of understanding how the prevalence and properties of outflows are correlated with the stellar populations of their host galaxies, we use the DEEP2 redshift survey to isolate a subsample of 72 objects in the Extended Groth Strip (EGS) for follow-up LRIS spectroscopy. These new observations, probing near-UV FeII and MgII resonance absorption lines, enable an estimate of wind velocities from the blueshifts of FeII relative to [OII] emission tracing the systemic velocity. We find that 40% of the sample exhibits significant outflows as traced by FeII absorption, possibly calling into question the ubiquity of galactic winds among z = 1 star-forming galaxies reported previously by other authors. At the same time, in a small fraction of the sample, we observe redshifted FeII features. This signature of infalling gas may be evidence for cosmological accretion, a process present in theoretical models but thus far unconfirmed by observations. With the extensive ancillary data sets associated with the EGS, we use GALEX-derived star-formation rates and HST imaging to investigate how outflows are correlated with star-formation rate, star-formation rate surface density, morphology, and inclination. We find the strongest correlation with star-formation rate surface density, where objects with higher star-formation rate surface densities exhibit stronger outflows. We also observe that face-on galaxies exhibit stronger outflows than edge-on systems, consistent with the canonical picture of winds emanating perpendicular to galactic disks. The MgII doublet at 2800 A and numerous fine-structure FeII* emission features are also observed in our LRIS spectra, offering independent probes of wind kinematics and circumgalactic gas in star-forming galaxies.
No associations
LandOfFree
The Prevalence and Properties of Outflowing Galactic Winds at z = 1 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 Prevalence and Properties of Outflowing Galactic Winds at z = 1, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Prevalence and Properties of Outflowing Galactic Winds at z = 1 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1578115