Clumpy Galaxies in GOODS and GEMS: Massive Analogs of Local Dwarf Irregulars

Details Clumpy Galaxies in GOODS and GEMS: Massive Analogs of Local Dwarf Irregulars Clumpy Galaxies in GOODS and GEMS: Massive Analogs of Local Dwarf Irregulars

2009-06-15

arxiv.org/abs/0906.2660v1

Astrophys.J.701:306-329,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

scheduled for ApJ 701, August 20, 2009, 40 pages, 20 figures

Scientific paper

10.1088/0004-637X/701/1/306

Clumpy galaxies in the GEMS and GOODS fields are examined for clues to their evolution into modern spirals. The magnitudes of the clumps and the surface brightnesses of the interclump regions are measured and fitted to models of stellar age and mass. There is an evolutionary trend from clump clusters with no evident interclump emission to clump clusters with faint red disks, to spiral galaxies of the flocculent or grand design types. Along this sequence, the interclump surface density increases and the mass surface density contrast between the clumps and the interclump regions decreases, suggesting a gradual dispersal of clumps to form disks. Also along this sequence, the bulge-to-clump mass ratios and age ratios increase, suggesting a gradual formation of bulges. All of these morphological types occur in the same redshift range, indicating that the clump cluster morphology is not the result of bandshifting. Comparisons to local galaxies with the same rest wavelength and spatial resolution show that clump clusters resemble local dwarf Irregulars. This resemblance is consistent with a model in which the clumpy morphology comes from gravitational instabilities in gas with a high turbulent speed compared to the rotation speed and a high mass fraction compared to the stars.

Affiliated with

Also associated with

No associations

Rating

Clumpy Galaxies in GOODS and GEMS: Massive Analogs of Local Dwarf Irregulars 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 Clumpy Galaxies in GOODS and GEMS: Massive Analogs of Local Dwarf Irregulars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Clumpy Galaxies in GOODS and GEMS: Massive Analogs of Local Dwarf Irregulars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-315954