期刊
ASTROPHYSICAL JOURNAL
卷 712, 期 1, 页码 516-526出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/712/1/516
关键词
galaxies: dwarf; galaxies: individual (Sagittarius)
资金
- Gates Cambridge Trust
- Isaac Newton Studentship
- Science and Technology Facilities Council (STFC)
- Royal Society
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- Science and Technology Facilities Council [ST/H001913/1, PP/E00105X/1, ST/H00243X/1] Funding Source: researchfish
- STFC [PP/E00105X/1, ST/H001913/1] Funding Source: UKRI
What was the mass of the progenitor of the Sagittarius (Sgr) dwarf galaxy? Here, we reassemble the stellar debris using Sloan Digital Sky Survey and Two Micron All-Sky Survey data to find the total luminosity and likely mass. We find that the luminosity is in the range (9.6-13.2) x 10(7) L(circle dot) or M(V) similar to -15.1 to -15.5, with 70% of the light residing in the debris streams. The progenitor is somewhat fainter than the present-day Small Magellanic Cloud, and comparable in brightness to the M31 dwarf spheroidals NGC 147 and NGC 185. Using cosmologically motivated models, we estimate that the mass of Sgr's dark matter halo prior to tidal disruption was similar to 10(10) M(circle dot).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据