Issue |
A&A
Volume 448, Number 1, March II 2006
|
|
---|---|---|
Page(s) | 123 - 131 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20053326 | |
Published online | 17 February 2006 |
On the neutral gas distribution and kinematics in the dwarf irregular galaxy IC 1613
1
Instituto Nacional de Astrofísica Optica y Electrónica, AP 51, 72000 Puebla, México e-mail: silich@inaoep.mx
2
Visiting professor in the Department of Physics and Astronomy at the University of Kentucky, USA
3
Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119992, Russia e-mail: lozinsk@sai.msu.ru
4
Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, 357147 Karachai-Cherkessian Republic, Russia e-mail: moisav@sao.ru
5
Instituto de Astronomía, Universidad Nacional Autónoma de México, AP 70-264, 04510 México DF, México e-mail: margarit@astroscu.unam.mx
6
European Southern Observatory, Ave., Alonso de Cordova 3107, Casilla 19 Santiago 19001, Chile e-mail: jborisso@eso.org
7
Instituto de Astronomía, UNAM, AP 877, Ensenada 22800, B.C., México e-mail: mago@astrosen.unam.mx
Received:
28
April
2005
Accepted:
13
October
2005
Aims.We study the neutral hydrogen distribution and
kinematics in the Local Group dwarf irregular galaxy IC 1613
and compare them with the ionized gas distribution and stellar
content of the galaxy. We discuss several mechanisms which
may be responsible for the origin of the observed complicated
HI morphology and compare parameters of the most prominent
kpc-scale HI structure with the multiple SNe scenario.Methods.The observations were performed with the Vary Large
Array of NRAO with a linear resolution ~ 23 pc at the
adopted distance of 725 kpc and the spectral channel width of 2.57 km s-1. The numerical calculations have been provided with
our 2.5D Lagrangian scheme based on the thin layer approximation.Results.We found that the ISM of the galaxy is highly
inhomogeneous and identified a number of intermediate-scale
(200 pc-300 pc in diameter) HI arcs and shells having expansion
velocities of 10 to 20 km s-1. Besides these shells, several
giant holes and arc-shaped structures have been revealed,
whose radii exceed several hundred parsecs. We found that
parameters of the most prominent (
)
kpc-scale structure and the level of the detected star formation
activity are inconsistent with the multiple SNe hypothesis.
© ESO, 2006
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