Dwarf Irregular Galaxies : Not so pristine after all
1er septembre 2004
See the Press Release from Subaru Telescope
leo-f1.jpg Figure 1 A 3-color combination of 3 images obtained by the Suprime-Cam on the Subaru telescope in Hawaii, of the dwarf irregular galaxy Leo A : Blue is B-band (0.45 microns), Green is V-band (0.55 microns) and Red is I-band (0.80 microns). Click on the image to enlarge it The size of Leo A revealed by these new observations is twice as large as its previously accepted size, suggesting that even in the nearby universe we see galaxies only as .tips of icebergs" that are actually a few times more extended.
leo-f2.gif Figure 2 The radial profile of the RGB star surface number density in Leo A. The lines fitted to the old disk, 2’.0 < a < 5’.5 (blue), the halo, 5’.5 < a < 7’.5 (red), and the background, 8’.0 < a < 12’.0 (green) radial profiles are shown. Click on the image to enlarge it
Reference The Full-fledged Dwarf Irregular Galaxy Leo A by Vansevicius, V., Arimoto, N., Hasegawa, T., Ikuta, C., Jablonka, P., Narbutis, D., Ohta, K., Stonkute, R., Tamura, N., Vansevicius, V., Yamada, Y. To be published in : August 20, 2004, Astrophysical Journal Letters (Volume 611, Number 2, L93). Contact Pascale Jablonka (Observatoire de Paris, GEPI)
Dernière modification le 4 mars 2013