NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
The Epoch of Disk Formation: z is Approximately l to TodayWe present data on galaxy kinematics, morphologies, and star-formation rates over 0.1 less than z less than 1.2 for approximately 500 blue galaxies. These data show how systems like our own Milky-Way have come into being. At redshifts around 1, about half the age of the Universe ago, Milky-Way mass galaxies were different beasts than today. They had a significant amount of disturbed motions, disturbed morphologies, shallower potential wells, higher specific star-formation rates, and likely higher gas fractions. Since redshift approximately 1, galaxies have decreased in disturbed motions, increased in rotation velocity and potential well depth, become more well-ordered morphologically, and decreased in specific star-formation rate. We find interrelationships between these measurements. Galaxy kinematics are correlated with morphology and specific star-formation rate such that galaxies with the fastest rotation velocities and the least amounts of disturbed motions have the most well-ordered morphologies and the lowest specific star-formation rates. The converse is true. Moreover, we find that the rate at which galaxies become more well-ordered kinematically (i.e., increased rotation velocity, decreased disturbed motions) and morphologically is directly proportional to their stellar mass.
Document ID
20120008345
Acquisition Source
Goddard Space Flight Center
Document Type
Presentation
Authors
Kassin, Susan (Oak Ridge Associated Universities, Inc. Oak Ridge, TN, United States)
Gardner, Jonathan (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Weiner, Ben
Faber, Sandra
Date Acquired
August 25, 2013
Publication Date
February 5, 2012
Subject Category
Astrophysics
Report/Patent Number
GSFC.ABS.5949.2012
Funding Number(s)
CONTRACT_GRANT: NN06CC03B
Distribution Limits
Public
Copyright
Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available