New HST/ACS Data of the Starburst Irregular Galaxy NGC 4449

被引：0

作者：

Annibali, Francesca ^{[1
]}

Aloisi, A. ^{[1
,2
]}

Mack, J. ^{[1
]}

Tosi, M. ^{[3
]}

van der Marel, R. P. ^{[1
]}

Angeretti, L. ^{[3
]}

Leitherer, C. ^{[1
]}

Sirianni, M. ^{[1
,2
]}

机构：

[1] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[2] Space Telescope Div, European Space Agcy, Paris, France

[3] INAF Osservatorio Astronom Bologna, Bologna, Italy

来源：

GALAXIES IN THE LOCAL VOLUME | 2008年

关键词：

D O I：

10.1007/978-1-4020-6933-8_59

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present B, V and I photometry with HST/ACS of the resolved stellar populations in the Magellanic starburst galaxy NGC 4449. Our photometry provides approximate to 300,000 objects in the (B, V) color-magnitude diagrams (CMDs) and approximate to 400,000 objects in the (V, I) CMDs. The features observed in tire CMDs imply a variety of stellar ages tip to at least 1 Gyr, and possibly as old as a Hubble time. Our data clearly indicate the presence of an age gradient, with voting and intermediate-age stars concentrated toward the galactic center, and old stars present everywhere. We derive the distance of NGC 4449 with air accuracy of 5% from the tip of the red giant branch: D = 3.82 +/- 0.18 Mpc.

引用

页码：269 / +

页数：2

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