The Local Volume Galaxy Census and HST Snap Surveys

IF 0.9 4区物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS

Astrophysics Pub Date : 2026-04-21 DOI:10.1007/s10511-026-09898-1

I. D. Karachentsev, M. I. Chazov, V. E. Karachentseva

引用次数: 0

Abstract

We examined F814W and F606W images of dwarf galaxies from the Hubble Space Telescope archive, which were obtained under the HST SNAP programs 17159 to 17797. Among 58 observed dwarfs located outside the Local Group, we found only a few objects that were confidently resolved into stars. We determined two new distances for the galaxies: dw1252+2215 (5.32 ± 0.20 Mpc) and dw1234+3952 (4.34 ± 0.16 Mpc) via the Tip of the Red Giant Branch. They turned out to be new probable dwarf satellites of the nearby luminous spiral galaxies NGC4826 and NGC4736, respectively. We also note that recent SNAP surveys vary in their productivity in measuring new galaxy distances by more than an order of magnitude.

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本地星系普查和HST快速调查

我们检查了哈勃太空望远镜档案中F814W和F606W的矮星系图像，这些图像是在HST SNAP计划17159到17797下获得的。在58个被观测到的位于本星系群之外的矮星中，我们只发现了几个被确定为恒星的物体。我们通过红巨星分支的尖端确定了两个星系的新距离：dw1252+2215（5.32±0.20 Mpc）和dw1234+3952（4.34±0.16 Mpc）。它们被证明分别是附近明亮的螺旋星系NGC4826和NGC4736的新的可能矮卫星。我们还注意到，最近的SNAP调查在测量新星系距离方面的生产力差异超过一个数量级。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Astrophysics 地学天文-天文与天体物理

CiteScore

0.90

自引率

20.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Astrophysics (Ap) is a peer-reviewed scientific journal which publishes research in theoretical and observational astrophysics. Founded by V.A.Ambartsumian in 1965 Astrophysics is one of the international astronomy journals. The journal covers space astrophysics, stellar and galactic evolution, solar physics, stellar and planetary atmospheres, interstellar matter. Additional subjects include chemical composition and internal structure of stars, quasars and pulsars, developments in modern cosmology and radiative transfer.