Ultraviolet Emission from Stellar Populations within Tidal Tails: Catching the Youngest Galaxies in Formation?
| Autor: | S. G. Neff, D. A. Thilker, M. Seibert, A. Gil de Paz, L. Bianchi, D. Schiminovich, D. C. Martin, B. F. Madore, R. M. Rich, T. A. Barlow, Y.-I. Byun, J. Donas, K. Forster, P. G. Friedman, T. M. Heckman, P. N. Jelinsky, Y.-W. Lee, R. F. Malina, B. Milliard, P. Morrissey, O. H. W. Siegmund, T. Small, A. S. Szalay, B. Y. Welsh, T. K. Wyder |
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| Přispěvatelé: | Laboratoire d'Astrophysique de Marseille (LAM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2005 |
| Předmět: |
Astrofísica
Galaxies: Interactions Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Galaxy merger 01 natural sciences [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] Galaxies: Evolution 0103 physical sciences Galaxies: Individual: NGC Number: NGC 7771 Astrophysics::Solar and Stellar Astrophysics Angstrom 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Dwarf galaxy Physics 010308 nuclear & particles physics Star formation Galaxies: Individual: NGC Number: NGC 520 Astrophysics (astro-ph) Galaxies: Individual: NGC Number: NGC 5719 Astronomy and Astrophysics Galaxy Astronomía Stars Space and Planetary Science Astrophysics::Earth and Planetary Astrophysics Galaxies: Individual: Name: Arp 295 |
| Zdroj: | The Astrophysical Journal The Astrophysical Journal, American Astronomical Society, 2005, 619L, pp.91. ⟨10.1086/426137⟩ The Astrophysical Journal, 2005, 619L, pp.91. ⟨10.1086/426137⟩ E-Prints Complutense: Archivo Institucional de la UCM Universidad Complutense de Madrid E-Prints Complutense. Archivo Institucional de la UCM instname |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.1086/426137 |
| Popis: | New GALEX observations have detected significant FUV (1530 Angstroms) and NUV (2310 Angstroms) emission from stellar substructures within the tidal tails of four ongoing galaxy mergers. The UV-bright regions are optically faint and are coincident with HI density enhancements. FUV emission is detected at any location where the HI surface density exceeds ~2 M_sun pc^{-2}, and is often detected in the absence of visible wavelength emission. UV luminosities of the brighter regions of the tidal tails imply masses of 10^6 M_sun to ~10^9 M_sun in young stars in the tails, and HI luminosities imply similar HI masses. UV-optical colors of the tidal tails indicate stellar populations as young as a few Myr, and in all cases ages < 400Myr. Most of the young stars in the tails formed in single bursts rather than resulting from continuous star formation, and they formed *in situ* as the tails evolved. Star formation appears to be older near the parent galaxies and younger at increasing distances from the parent galaxy. This could be because the star formation occurs progressively along the tails, or because the star formation has been inhibited near the galaxy/tail interface. The youngest stellar concentrations, usually near the ends of long tidal tails, have masses comparable to confirmed tidal dwarf galaxies and may be newly forming galaxies undergoing their first burst of star formation. This paper will be published as part of the Galaxy Evolution Explorer (GALEX) Astrophysical Journal Letters Special Issue. Links to the full set of papers will be available at http://www.galex.caltech.edu/PUBLICATIONS/ after November 22, 2004 |
| Databáze: | OpenAIRE |
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