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.
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
Référence
- 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. A paraître dans : August 20, 2004, Astrophysical Journal Letters (Volume 611, Number 2, L93).
Contact
- Pascale Jablonka
Observatoire de Paris, GEPI