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你可能喜欢The satellites of the Milky Way – insights from semi-analytic modelling in a ΛCDM cosmology
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1Kapteyn Astronomical Institute, University of Groningen, PO Box 800, NL-9700 AV Groningen, the Netherlands
2Department of Physics and Astronomy, University of Victoria, PO Box 3055, STN CSC, Victoria BC V8W 3P6, Canada
3INAF – Astronomical Observatory of Trieste, via G. B. Tiepolo 11, I-34143 Trieste, Italy
4Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China
5Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA
6Institute of Computational Cosmology, Science Laboratories, University of Durham, South Road, Durham DH1 3LE
7Heidelberg Institute for Theoretical Studies, Schloss-Wolfsbrunnenweg 35, D-69118 Heidelberg, Germany
8Astronomisches Recheninstitut, Zentrum für Astronomie Universit?t Heidelberg, M?nchhofstr. 12-14, D-69120 Heidelberg, Germany
9Max Planck Institut für Astrophysik Karl-Schwarzschild-Str. 1, D-85741 Garching, Germany
★E-mail: else{at}uvic.ca
Accepted 2012 November 6.
Received 2012 October 27.
In original form 2012 May 31.
First published online December 5, 2012.
We combine the six high-resolution Aquarius dark matter simulations with a semi-analytic galaxy formation model to investigate
the properties of the satellites of Milky Way-like galaxies. We find good correspondence with the observed luminosity function,
luminosity–metallicity relation and radial distribution of the Milky Way satellites. The star formation histories of the dwarf
galaxies in our model vary widely, in accordance with what is seen observationally. Some systems are dominated by old populations,
whereas others are dominated by inte star formation histories can either be continuous or more bursty.
Ram-pressure stripping of hot gas from the satellites leaves a clear imprint of the environment on the characteristics of
a dwarf galaxy. We find that the fraction of satellites dominated by old populations of stars matches observations well. However,
the internal metallicity distributions of the model satellites appear to be narrower than observed. This may indicate limitations
in our treatment of chemical enrichment, which is based on the instantaneous recycling approximation. We find a strong correlation
between the number of satellites and the dark matter mass of the host halo. Our model works best if the dark matter halo of
the Milky Way has a mass of ~8 × 1011 M⊙, in agreement with the lower estimates from observations, but about a factor of 2 lower than estimates based on the Local
Group timing argument or abundance matching techniques. The galaxy that resembles the Milky Way the most also has the best-matching
satellite luminosity function, although it does not contain an object as bright as the Large or Small Magellanic Cloud. Compared
to other semi-analytic models and abundance matching relations we find that central galaxies reside in less massive haloes,
but the halo mass–stellar mass relation in our model is consistent both with hydrodynamical simulations and with recent observations.
10.1093/mnras/sts367
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元器件型号
SG-8003CA-SDM
OSC CMOS PROG 2.5V ST SMD
1:$4.20000
10:$3.60000
50:$2.64000
100:$2.40000
500:$1.80000
1,000:$1.60000
2,500:$1.48000
5,000:$1.32000
10,000:$1.16000
SG-8003CA-SDL
OSC CMOS PROG 2.5V ST SMD
1:$4.20000
10:$3.60000
50:$2.64000
100:$2.40000
500:$1.80000
1,000:$1.60000
2,500:$1.48000
5,000:$1.32000
10,000:$1.16000
SG-8003CA-SDC
OSC CMOS PROG 2.5V ST SMD
1:$4.20000
10:$3.60000
50:$2.64000
100:$2.40000
500:$1.80000
1,000:$1.60000
2,500:$1.48000
5,000:$1.32000
10,000:$1.16000
OSC CMOS PROG 2.5V ST SMD
1:$4.20000
10:$3.60000
50:$2.64000
100:$2.40000
500:$1.80000
1,000:$1.60000
2,500:$1.48000
5,000:$1.32000
10,000:$1.16000
OSC CMOS PROG 2.5V OE SMD
1:$4.20000
10:$3.60000
50:$2.64000
100:$2.40000
500:$1.80000
1,000:$1.60000
2,500:$1.48000
5,000:$1.32000
10,000:$1.16000
OSC CMOS PROG 2.5V OE SMD
1:$4.20000
10:$3.60000
50:$2.64000
100:$2.40000
500:$1.80000
1,000:$1.60000
2,500:$1.48000
5,000:$1.32000
10,000:$1.16000
OSC CMOS PROG 2.5V OE SMD
1:$4.20000
10:$3.60000
50:$2.64000
100:$2.40000
500:$1.80000
1,000:$1.60000
2,500:$1.48000
5,000:$1.32000
10,000:$1.16000
OSC CMOS PROG 2.5V OE SMD
1:$4.20000
10:$3.60000
50:$2.64000
100:$2.40000
500:$1.80000
1,000:$1.60000
2,500:$1.48000
5,000:$1.32000
10,000:$1.16000
SG-8003CA-SEM
OSC CMOS PROG 1.8V ST SMD
1:$4.20000
10:$3.60000
50:$2.64000
100:$2.40000
500:$1.80000
1,000:$1.60000
2,500:$1.48000
5,000:$1.32000
10,000:$1.16000
SG-8003CA-SEL
OSC CMOS PROG 1.8V ST SMD
1:$4.20000
10:$3.60000
50:$2.64000
100:$2.40000
500:$1.80000
1,000:$1.60000
2,500:$1.48000
5,000:$1.32000
10,000:$1.16000
SG-8003CA-SEC
OSC CMOS PROG 1.8V ST SMD
1:$4.20000
10:$3.60000
50:$2.64000
100:$2.40000
500:$1.80000
1,000:$1.60000
2,500:$1.48000
5,000:$1.32000
10,000:$1.16000
OSC CMOS PROG 1.8V ST SMD
1:$4.20000
10:$3.60000
50:$2.64000
100:$2.40000
500:$1.80000
1,000:$1.60000
2,500:$1.48000
5,000:$1.32000
10,000:$1.16000
SG-8003CA-PEM
OSC CMOS PROG 1.8V OE SMD
1:$4.20000
10:$3.60000
50:$2.64000
100:$2.40000
500:$1.80000
1,000:$1.60000
2,500:$1.48000
5,000:$1.32000
10,000:$1.16000
OSC CMOS PROG 1.8V OE SMD
1:$4.20000
10:$3.60000
50:$2.64000
100:$2.40000
500:$1.80000
1,000:$1.60000
2,500:$1.48000
5,000:$1.32000
10,000:$1.16000
OSC CMOS PROG 1.8V OE SMD
1:$4.20000
10:$3.60000
50:$2.64000
100:$2.40000
500:$1.80000
1,000:$1.60000
2,500:$1.48000
5,000:$1.32000
10,000:$1.16000
SG-8003CA-PEB
OSC CMOS PROG 1.8V OE SMD
1:$4.20000
10:$3.60000
50:$2.64000
100:$2.40000
500:$1.80000
1,000:$1.60000
2,500:$1.48000
5,000:$1.32000
10,000:$1.16000
OSC CMOS PROG 3.3V ST SMD
1:$3.78000
10:$3.24000
50:$2.37600
100:$2.16000
500:$1.62000
1,000:$1.44000
2,500:$1.33200
5,000:$1.18800
10,000:$1.04400
OSC CMOS PROG 3.3V ST SMD
1:$3.78000
10:$3.24000
50:$2.37600
100:$2.16000
500:$1.62000
1,000:$1.44000
2,500:$1.33200
5,000:$1.18800
10,000:$1.04400
OSC CMOS PROG 3.3V ST SMD
1:$3.78000
10:$3.24000
50:$2.37600
100:$2.16000
500:$1.62000
1,000:$1.44000
2,500:$1.33200
5,000:$1.18800
10,000:$1.04400
OSC CMOS PROG 3.3V ST SMD
1:$3.78000
10:$3.24000
50:$2.37600
100:$2.16000
500:$1.62000
1,000:$1.44000
2,500:$1.33200
5,000:$1.18800
10,000:$1.04400
OSC CMOS PROG 3.3V OE SMD
1:$3.78000
10:$3.24000
50:$2.37600
100:$2.16000
500:$1.62000
1,000:$1.44000
2,500:$1.33200
5,000:$1.18800
10,000:$1.04400
OSC CMOS PROG 3.3V OE SMD
1:$3.78000
10:$3.24000
50:$2.37600
100:$2.16000
500:$1.62000
1,000:$1.44000
2,500:$1.33200
5,000:$1.18800
10,000:$1.04400
OSC CMOS PROG 3.3V OE SMD
1:$3.78000
10:$3.24000
50:$2.37600
100:$2.16000
500:$1.62000
1,000:$1.44000
2,500:$1.33200
5,000:$1.18800
10,000:$1.04400
OSC CMOS PROG 3.3V OE SMD
1:$3.78000
10:$3.24000
50:$2.37600
100:$2.16000
500:$1.62000
1,000:$1.44000
2,500:$1.33200
5,000:$1.18800
10,000:$1.04400
OSC CMOS PROG 2.5V ST SMD
1:$3.78000
10:$3.24000
50:$2.37600
100:$2.16000
500:$1.62000
1,000:$1.44000
2,500:$1.33200
5,000:$1.18800
10,000:$1.04400
OSC CMOS PROG 2.5V ST SMD
1:$3.78000
10:$3.24000
50:$2.37600
100:$2.16000
500:$1.62000
1,000:$1.44000
2,500:$1.33200
5,000:$1.18800
10,000:$1.04400
OSC CMOS PROG 2.5V ST SMD
1:$3.78000
10:$3.24000
50:$2.37600
100:$2.16000
500:$1.62000
1,000:$1.44000
2,500:$1.33200
5,000:$1.18800
10,000:$1.04400
SG-8003JF-SDB
OSC CMOS PROG 2.5V ST SMD
1:$3.78000
10:$3.24000
50:$2.37600
100:$2.16000
500:$1.62000
1,000:$1.44000
2,500:$1.33200
5,000:$1.18800
10,000:$1.04400
SG-8003JF-PDM
OSC CMOS PROG 2.5V OE SMD
1:$3.78000
10:$3.24000
50:$2.37600
100:$2.16000
500:$1.62000
1,000:$1.44000
2,500:$1.33200
5,000:$1.18800
10,000:$1.04400
SG-8003JF-PDL
OSC CMOS PROG 2.5V OE SMD
1:$3.78000
10:$3.24000
50:$2.37600
100:$2.16000
500:$1.62000
1,000:$1.44000
2,500:$1.33200
5,000:$1.18800
10,000:$1.04400
SG-8003CA-SDM • PDF参数
晶体和振荡器
由 Digi-Key 编程（请在网站订购单中输入您需要的频率）
可用频率范围:
1MHz ~ 166MHz
待机 （断电）
频率稳定性:
-40&C ~ 85&C
扩展频谱带宽:
电流 - 电源（最大）:
封装/外壳:
4-SMD，无引线（DFN，LCC）
0.055"（1.40mm）
尺寸/尺寸:
0.276" L x 0.197" W（7.00mm x 5.00mm）
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