Bibcode
Elmegreen, B. G.; Elmegreen, Debra Meloy; Sánchez-Almeida, J.; Muñoz-Tuñón, C.; Dewberry, J.; Putko, J.; Teich, Y.; Popinchalk, M.
Bibliographical reference
The Astrophysical Journal, Volume 774, Issue 1, article id. 86, 14 pp. (2013).
Advertised on:
9
2013
Journal
Citations
60
Refereed citations
54
Description
Local UV-bright galaxies in the Kiso survey include clumpy systems with
kiloparsec-size star complexes that resemble clumpy young galaxies in
surveys at high redshift. We compare clump masses and underlying disks
in several dozen galaxies from each of these surveys to the star
complexes and disks of normal spirals. Photometry and spectroscopy for
the Kiso and spiral sample come from the Sloan Digital Sky Survey. We
find that the largest Kiso clumpy galaxies resemble Ultra Deep Field
(UDF) clumpies in terms of the star formation rates, clump masses, and
clump surface densities. Clump masses and surface densities in normal
spirals are smaller. If the clump masses are proportional to the
turbulent Jeans mass in the interstellar medium, then for the most
luminous galaxies in the sequence of normal:Kiso:UDF, the turbulent
speeds and surface densities increase in the proportions 1.0:4.7:5.0 and
1.0:4.0:5.1, respectively, for fixed restframe B-band absolute
magnitude. For the least luminous galaxies in the overlapping magnitude
range, the turbulent speed and surface density trends are 1.0:2.7:7.4
and 1.0:1.4:3.0, respectively. We also find that while all three types
have radially decreasing disk intensities when measured with ellipse-fit
azimuthal averages, the average profiles are more irregular for UDF
clumpies (which are viewed in their restframe UV) than for Kiso galaxies
(viewed at g-band), and major axis intensity scans are even more
irregular for the UDF than Kiso galaxies. Local clumpy galaxies in the
Kiso survey appear to be intermediate between UDF clumpies and normal
spirals.
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Casiana
Muñoz Tuñón