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Your search keyword '"McIntosh, DH"' showing total 2 results
Start Over Author "McIntosh, DH" Topic astrophysics::earth and planetary astrophysics
2 results on '"McIntosh, DH"'

1. GEMS: The Size Evolution of Disk Galaxies

Author

Barden, M, Rix, HW, Somerville, RS, Bell, EF, Haeussler, B, Peng, CY, Borch, A, Beckwith, SVW, Caldwell, JAR, Heymans, C, Jahnke, K, Jogee, S, McIntosh, DH, Meisenheimer, K, Sanchez, SF, Wisotzki, L, and Wolf, C

Subjects
Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

We combine HST imaging from the GEMS survey with photometric redshifts from COMBO-17 to explore the evolution of disk-dominated galaxies since z10. We find strong evolution in the magnitude-size scaling relation for galaxies with M(V)10 over the same time interval. This is strongly inconsistent with the most naive theoretical expectation, in which disk size scales in proportion to the halo virial radius, which would predict that disks are a factor of two denser at fixed mass at z=1. The lack of evolution in the stellar mass-size relation is consistent with an ``inside-out'' growth of galaxy disks on average (galaxies increasing in size as they grow more massive), although we cannot rule out more complex evolutionary scenarios., Comment: 22 pages, 16 figures, submitted to ApJ

Published
2016

2. LESS THAN 10 PERCENT OF STAR FORMATION IN z similar to 0.6 MASSIVE GALAXIES IS TRIGGERED BY MAJOR INTERACTIONS

Author

Robaina, AR, Bell, EF, Skelton, RE, McIntosh, DH, Somerville, RS, Zheng, X, Rix, H-W, Bacon, D, Balogh, M, Barazza, FD, Barden, M, Boehm, A, Caldwell, JAR, Gallazzi, A, Gray, ME, Haeussler, B, Heymans, C, Jahnke, K, Jogee, S, van Kampen, E, Lane, K, Meisenheimer, K, Papovich, C, Peng, CY, Sanchez, SF, Skibba, R, Taylor, A, Wisotzki, L, and Wolf, C

Subjects
Spectral Energy-Distributions, Stellar Mass, Formation History, galaxies: starburst, Active Galactic Nuclei, Hubble-Space-Telescope, Astrophysics::Cosmology and Extragalactic Astrophysics, galaxies: general, infrared: galaxies, High-Redshift Galaxies, Forming Galaxies, galaxies: interactions, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Ultraluminous Infrared Galaxies, Deep Field-South, X-Ray-Emission, galaxies: evolution, Astrophysics::Galaxy Astrophysics, galaxies: statistics
Abstract

Both observations and simulations show that major tidal interactions or mergers between gas-rich galaxies can lead to intense bursts of star formation. Yet, the average enhancement in star formation rate (SFR) in major mergers and the contribution of such events to the cosmic SFR are not well estimated. Here we use photometric redshifts, stellar masses, and UV SFRs from COMBO-17, 24 μm SFRs from Spitzer, and morphologies from two deep Hubble Space Telescope (HST) cosmological survey fields (ECDFS/GEMS and A901/STAGES) to study the enhancement in SFR as a function of projected galaxy separation. We apply two-point projected correlation function techniques, which we augment with morphologically selected very close pairs (separation

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