A comparative study of satellite galaxies in Milky Way-like galaxies from HSC, DECaLS and SDSS
| Autor: | Rachael L. Beaton, Wentao Luo, Tian Qiu, Surhud More, Hironao Miyatake, Robert H. Lupton, Xiangchong Li, Wenting Wang, Ting-Wen Lan, Scott G. Carlsten, Jingjing Shi, Yen-Ting Lin, Masahiro Takada |
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| Rok vydání: | 2020 |
| Předmět: |
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Milky Way media_common.quotation_subject Dark matter FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Luminosity Galactic halo 0103 physical sciences Satellite galaxy Astrophysics::Solar and Stellar Astrophysics 10. No inequality 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics media_common Physics 010308 nuclear & particles physics Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Universe Galaxy Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Satellite Astrophysics - Cosmology and Nongalactic Astrophysics |
| DOI: | 10.48550/arxiv.2009.06882 |
| Popis: | We conduct a comprehensive and statistical study of the luminosity functions (LFs) for satellite galaxies, by counting photometric galaxies from HSC, DECaLS and SDSS around isolated central galaxies (ICGs) and paired galaxies from the SDSS/DR7 spectroscopic sample. Results of different surveys show very good agreement. The satellite LFs can be measured down to $M_V\sim-10$, and for central primary galaxies as small as $8.5-12$. Hence the MW and its satellite system are statistically atypical of our sample of MW-mass systems. In consequence, our MW is not a good representative of other MW-mass galaxies. Strong cosmological implications based on only MW satellites await additional discoveries of fainter satellites in extra-galactic systems. Interestingly, the MW satellite LF is typical among other MW-mass systems within 40~Mpc in the local Universe, perhaps implying the Local Volume is an under-dense region. Comment: accepted by MNRAS, with more detailed discussions about the scatter |
| Databáze: | OpenAIRE |
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