Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-07-12
Astrophys.J.701:1636-1643,2009
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
22 pages, 5 figures, 1 table, accepted for publication in ApJ
Scientific paper
10.1088/0004-637X/701/2/1636
We have observed the central region of the nearby starburst galaxy NGC 253 with the Kyoto Tridimensional Spectrograph II (Kyoto3DII) Fabry-Perot mode in order to investigate the properties of its galactic wind. Since this galaxy has a large inclination, it is easy to observe its galactic wind. We produced the Ha, [N II]6583, and [S II]6716,6731 images, as well as those line ratio maps. The [N II]/Ha ratio in the galactic wind region is larger than those in H II regions in the galactic disk. The [N II]/Ha ratio in the southeastern filament, a part of the galactic wind, is the largest and reaches about 1.5. These large [N II]/Ha ratios are explained by shock ionization/excitation. Using the [S II]/Ha ratio map, we spatially separate the galactic wind region from the starburst region. The kinetic energy of the galactic wind can be sufficiently supplied by supernovae in a starburst region in the galactic center. The shape of the galactic wind and the line ratio maps are non-axisymmetric about the galactic minor axis, which is also seen in M82. In the [N II]6583/[S II]6716,6731 map, the positions with large ratios coincide with the positions of star clusters found in the Hubble Space Telescope (HST) observation. This means that intense star formation causes strong nitrogen enrichment in these regions. Our unique data of the line ratio maps including [S II] lines have demonstrated their effectiveness for clearly distinguishing between shocked gas regions and starburst regions, determining the extent of galactic wind and its mass and kinetic energy, and discovering regions with enhanced nitrogen abundance.
Hattori Takeshi
Ishigaki Tsuyoshi
Kawai Atsushi
Kosugi George
Matsubayashi Kazuya
No associations
LandOfFree
Galactic Wind in the Nearby Starburst Galaxy NGC 253 Observed with the Kyoto3DII Fabry-Perot Mode does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Galactic Wind in the Nearby Starburst Galaxy NGC 253 Observed with the Kyoto3DII Fabry-Perot Mode, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Galactic Wind in the Nearby Starburst Galaxy NGC 253 Observed with the Kyoto3DII Fabry-Perot Mode will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-593364