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arXiv:astro-ph/0509907 (astro-ph)
[Submitted on 30 Sep 2005]

Title:Growth of Spirals: Secular or Driven by Mergers ?

Authors:F. Hammer
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Abstract: The physical phenomena contributing to the galaxy growth can be tested all the way to z= 1. Galaxy mass, extinction, star formation and gas metal abundance can be measured in a robust way, as well as the distribution of the galaxy morphologies. I discuss here the observational methods and their accuracy. Physical quantities can be evaluated with uncertainties much lower than 0.3 dex, if they are based on 2 sets of independent measurements. For example, at a given IMF, the star formation rate is well estimated by combining flux measurements of the extinction corrected Balmer line and of the mid-IR continuum.
Spiral mass growth had occurred from gas accretion and from merging. Gas accretion can explain at most half of the spiral mass growth: at moderate redshift, the numerous population of compact, merger and irregular galaxies requires another origin. A spiral rebuilding scenario is able to reproduce all the evolutionary trends observed since z~1, and could be at the origin of the present-day, numerous population of early type spirals.
Comments: 12 pages, 4 figures, review paper in "When UV meets IR: a History of Star Formation", XXVth Moriond Astrophysics Meeting, ed. D. Elbaz and H. Aussel
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0509907
  (or arXiv:astro-ph/0509907v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0509907

Submission history

From: Ravikumar Chazhiyat [view email]
[v1] Fri, 30 Sep 2005 13:21:28 UTC (441 KB)
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