Academic Journal
FUSE Observations of Outflowing OVI in the Dwarf Starburst Galaxy NGC 1705
| العنوان: | FUSE Observations of Outflowing OVI in the Dwarf Starburst Galaxy NGC 1705 |
|---|---|
| المؤلفون: | T. M. Heckman, K. R. Sembach, G. R. Meurer, D. K. Strickl, C. L. Martin, D. Calzetti, C. Leitherer |
| المساهمون: | The Pennsylvania State University CiteSeerX Archives |
| المصدر: | http://arxiv.org/pdf/astro-ph/0102283v2.pdf. |
| سنة النشر: | 2001 |
| المجموعة: | CiteSeerX |
| مصطلحات موضوعية: | Guest Investigators on the NASA-CNES-CSA Far Ultraviolet Spectroscopic Explorer. FUSE is operated fo |
| الوصف: | We report FUSE far-UV spectroscopy of the prototypical dwarf starburst galaxy NGC 1705. These data allow us for the first time to directly probe the coronal-phase (T = few ×10 5 K) gas that may dominate the radiative cooling of the supernova-heated ISM and thereby determine the dynamical evolution of the starburst-driven outflows in dwarf galaxies. We detect a broad (∼100 km s −1 FWHM) and blueshifted (∆v = 77 km s −1) OV Iλ1032 absorption-line arising in the previously-known galactic outflow. The mass and kinetic energy in the outflow we detect is dominated by the warm (T ∼ 10 4 K) photoionized gas which is also seen through its optical line-emission. The kinematics of this warm gas are compatible with a simple model of the adiabatic expansion of a superbubble driven by the collective effect of the kinetic energy supplied by supernovae in the starburst. However, the observed properties of the OV I absorption in NGC 1705 are not consistent with the simple superbubble model, in which the OV I would arise in a conductive interface inside the superbubble’s outer shell. The relative outflow speed of the OV I is too high and the observed column density (logNOV I = 14.3) is much too large. We argue that the superbubble has begun to blow out of the ISM of NGC 1705. During this blow-out phase the superbubble shell accelerates and fragments. 1 |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.317.8122; http://arxiv.org/pdf/astro-ph/0102283v2.pdf |
| الاتاحة: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.317.8122 http://arxiv.org/pdf/astro-ph/0102283v2.pdf |
| Rights: | Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
| رقم الانضمام: | edsbas.82F7957F |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |