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THE FORMATION AND EVOLUTION OF GALACTIC DISKS IS ONE OF THE KEY QUESTIONS IN EXTRAGALACTIC ASTRONOMY TODAY. WE PLAN TO USE ARCHIVAL DATA FROM GALEX SPITZER AND WISE TO INVESTIGATE THE GROWTH AND EVOLUTION OF THE STELLAR COMPONENT IN A STATISTICAL SAMPLE OF NEARBY GALAXIES. DATA COVERING A BROAD WAVELENGTH RANGE ARE CRITICAL FOR MEASUREMENT OF CURRENT STAR FORMATION ACTIVITY STELLAR POPULATIONS AND STELLAR DISTRIBUTIONS IN NEARBY GALAXIES. IN ORDER TO INVESTIGATE THE TIMESCALES ASSOCIATED WITH THE GROWTH OF GALACTIC DISKS WE WILL (1) INVESTIGATE THE STRUCTURE OF THE UNDERLYING STELLAR DISTRIBUTION (2) MEASURE THE RATIO OF CURRENT-TO-PAST STAR FORMATION ACTIVITY AS A FUNCTION OF RADIUS AND (3) INVESTIGATE THE GROWTH OF THE STELLAR DISK AS A FUNCTION OF BARYON FRACTION AND TOTAL DYNAMICAL MASS. THE PROPOSED PROJECTS LEVERAGE THE EXISTING DEEP WIDE FIELD-OF-VIEW NEAR INFRARED IMAGING OBSERVATIONS OBTAINED WITH THE SPITZER SPACE TELESCOPE AS PART OF THE EDGES SURVEY A CYCLE 8 EXPLORATION SCIENCE PROGRAM. THE PROPOSED ANALYSIS OF MULTI-WAVELENGTH IMAGING OBSERVATIONS OF A WELL-DEFINED STATISTICAL SAMPLE WILL PLACE STRONG CONSTRAINTS ON HIERARCHICAL MODELS OF GALAXY FORMATION AND EVOLUTION AND WILL FURTHER OUR UNDERSTANDING OF THE STELLAR COMPONENT OF NEARBY GALAXIES.

$299,976FY2017National Aeronautics and Space AdministrationNASA

Trustees Of Indiana University, Bloomington IN

Investigators

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THE FORMATION AND EVOLUTION OF GALACTIC DISKS IS ONE OF THE KEY QUESTIONS IN EXTRAGALACTIC ASTRONOMY TODAY. WE PLAN TO USE ARCHIVAL DATA FROM GALEX SPITZER AND WISE TO INVESTIGATE THE GROWTH AND EVOLUTION OF THE STELLAR COMPONENT IN A STATISTICAL SAMPLE OF NEARBY GALAXIES. DATA COVERING A BROAD WAVELENGTH RANGE ARE CRITICAL FOR MEASUREMENT OF CURRENT STAR FORMATION ACTIVITY STELLAR POPULATIONS AND STELLAR DISTRIBUTIONS IN NEARBY GALAXIES. IN ORDER TO INVESTIGATE THE TIMESCALES ASSOCIATED WITH THE GROWTH OF GALACTIC DISKS WE WILL (1) INVESTIGATE THE STRUCTURE OF THE UNDERLYING STELLAR DISTRIBUTION (2) MEASURE THE RATIO OF CURRENT-TO-PAST STAR FORMATION ACTIVITY AS A FUNCTION OF RADIUS AND (3) INVESTIGATE THE GROWTH OF THE STELLAR DISK AS A FUNCTION OF BARYON FRACTION AND TOTAL DYNAMICAL MASS. THE PROPOSED PROJECTS LEVERAGE THE EXISTING DEEP WIDE FIELD-OF-VIEW NEAR INFRARED IMAGING OBSERVATIONS OBTAINED WITH THE SPITZER SPACE TELESCOPE AS PART OF THE EDGES SURVEY A CYCLE 8 EXPLORATION SCIENCE PROGRAM. THE PROPOSED ANALYSIS OF MULTI-WAVELENGTH IMAGING OBSERVATIONS OF A WELL-DEFINED STATISTICAL SAMPLE WILL PLACE STRONG CONSTRAINTS ON HIERARCHICAL MODELS OF GALAXY FORMATION AND EVOLUTION AND WILL FURTHER OUR UNDERSTANDING OF THE STELLAR COMPONENT OF NEARBY GALAXIES. · GrantIndex