Local Tadpole Galaxies
Debra Meloy Elmegreen (1), Bruce G. Elmegreen (2), Jorge Sanchez, Almeida (3), Casiana Munoz-Tunon (3), Joseph Putko (1,4), Janosz Dewberry (1), ((1) Vassar College, (2) IBM Research, (3) Instituto de Astrofisica de, Canarias, (4) Middlebury College)

TL;DR
This study analyzes local tadpole galaxies using SDSS data, revealing their star-forming regions, ages, and surface densities, and compares them to high-redshift counterparts to understand their evolution and formation mechanisms.
Contribution
It provides the first detailed comparison of local and high-redshift tadpole galaxies, highlighting their star formation properties and suggesting their nature as bulge-free disks with lopsided star formation.
Findings
Star-forming mass in heads scales with galaxy luminosity.
Head surface density increases with redshift, reflecting higher gas abundance.
Tails resemble bulge-free galaxy disks with decreasing ages at higher redshift.
Abstract
Tadpole galaxies have a giant star-forming region at the end of an elongated intensity distribution. Here we use SDSS data to determine the ages, masses, and surface densities of the heads and tails in 14 local tadpoles selected from the Kiso and Michigan surveys of UV-bright galaxies, and we compare them to tadpoles previously studied in the Hubble Ultra Deep Field. The young stellar mass in the head scales linearly with restframe galaxy luminosity, ranging from ~10^5 M_solar at galaxy absolute magnitude U=-13 mag to 10^9 M_solar at U=-20 mag. The corresponding head surface density increases from several M_solar pc^{-2} locally to 10-100 M_solar pc^{-2} at high redshift, and the star formation rate per unit area in the head increases from ~0.01 M_solar yr^{-1} kpc^{-2} locally to ~1 M_solar yr^{-1} kpc^{-2} at high z. These local values are normal for star-forming regions, and the…
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Taxonomy
TopicsAstronomy and Astrophysical Research · Galaxies: Formation, Evolution, Phenomena · Scientific Research and Discoveries
