Academic Journal
Preprint typeset using L ATEX style emulateapj v. 25/04/01 BAR EVOLUTION OVER THE LAST EIGHT BILLION YEARS: A CONSTANT FRACTION OF STRONG BARS IN GEMS
| العنوان: | Preprint typeset using L ATEX style emulateapj v. 25/04/01 BAR EVOLUTION OVER THE LAST EIGHT BILLION YEARS: A CONSTANT FRACTION OF STRONG BARS IN GEMS |
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| المؤلفون: | Shardha Jogee, Fabio D. Barazza, Hans-walter Rix, Isaac Shlosman, Christian Wolf, James Davies, Inge Heyer, Steven V. W. Beckwith, F. Bell, Andrea Borch, John A. R. Caldwell, Christopher J. Conselice, Boris Häussler, Catherine Heymans, Knud Jahnke, Johan H. Knapen, S. Somerville, Lutz Wisotzki |
| المساهمون: | The Pennsylvania State University CiteSeerX Archives |
| المصدر: | http://arxiv.org/pdf/astro-ph/0408382v3.pdf. |
| سنة النشر: | 2004 |
| المجموعة: | CiteSeerX |
| الوصف: | One third of present-day spirals host optically visible strong bars that drive their dynamical evolution. However, the fundamental question of how bars evolve over cosmological times has yet to be resolved, and even the frequency of bars at intermediate redshifts remains controversial. We investigate the frequency of bars out to z ∼ 1 drawing on a sample of 1590 galaxies from the Galaxy Evolution from Morphology and SEDs survey, which provides morphologies from Hubble Space Telescope Advanced Camera for Surveys (ACS) two-band images and accurate redshifts from the COMBO-17 survey. We identify spiral galaxies using three independent techniques based on the Sersic index, concentration parameter, and rest-frame color. We characterize bar and disk features by fitting ellipses to F606W and F850LP images, using the two bands to minimize shifts in the rest-frame bandpass. We exclude highly inclined (i> 60 ◦ ) galaxies to ensure reliable morphological classifications and apply different completeness cuts of MV ≤ −19.3 and −20.6. More than 40 % of the bars that we detect have semi major axes a < 0. ′ ′ 5 and would be easily missed in earlier surveys without the small point spread function of ACS. The bars that we can reliably detect are fairly strong (with ellipticities e ≥ 0.4) and have a in the range ∼1.2–13 kpc. We find that the optical fraction of such strong bars remains at ∼30 % ± 6 % from the present-day out to look-back |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.317.1129; http://arxiv.org/pdf/astro-ph/0408382v3.pdf |
| الاتاحة: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.317.1129 http://arxiv.org/pdf/astro-ph/0408382v3.pdf |
| Rights: | Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
| رقم الانضمام: | edsbas.682D037D |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |