Scl-dE1 GC1: AN EXTENDED GLOBULAR CLUSTER IN A LOW-LUMINOSITY DWARF ELLIPTICAL GALAXY

被引：49

作者：

Da Costa, G. S. ^{[1
]}

Grebel, E. K. ^{[2
]}

Jerjen, H. ^{[1
]}

Rejkuba, M. ^{[3
]}

Sharina, M. E. ^{[4
]}

机构：

[1] Australian Natl Univ, Mt Stromlo Observ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia

[2] Univ Heidelberg, Zentrum Astron, Astron Rech Inst, D-69120 Heidelberg, Germany

[3] European So Observ, D-85748 Garching, Germany

[4] Special Astrophys Observ, Nizhnii Arkhyz 369167, Russia

来源：

ASTRONOMICAL JOURNAL | 2009年 / 137卷 / 05期

基金：

瑞士国家科学基金会;

关键词：

galaxies: dwarf; galaxies: star clusters; globular clusters: general; HUBBLE-SPACE-TELESCOPE; SURFACE-BRIGHTNESS PROFILES; RED GIANT BRANCH; MILKY-WAY; STAR-CLUSTERS; STRUCTURAL PARAMETERS; SCULPTOR GROUP; GALACTIC HALO; DISTANCES; M31;

D O I：

10.1088/0004-6256/137/5/4361

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery from Hubble Space Telescope/ACS images of an extended globular cluster, denoted by Scl-dE1 GC1, in the Sculptor Group dwarf Elliptical galaxy Scl-dE1 (Sc22). The distance of the dE is determined as 4.3 +/- 0.25 Mpc from the I magnitude of the tip of the red giant branch in the color-magnitude diagram. At this distance the half-light radius of Scl-dE1 GC1 is similar to 22 pc, placing it among the largest clusters known, particularly for globular clusters associated with dwarf galaxies. The absolute magnitude of Scl-dE1 GC1 is M(V) = -6.7 and, to within the photometric uncertainties of the data, the cluster stellar population appears indistinguishable from that of the dE. We suggest that there may be two modes of globular cluster formation in dwarf galaxies, a "normal" mode with half-light radii of typically 3 pc, and an "extended" mode with half-light radii of similar to 10 pc or more.

引用

页码：4361 / 4367

页数：7

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