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| Autores principales: | , , , , , , , , , , , , |
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| Formato: | Preprint |
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2025
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| Acceso en línea: | https://arxiv.org/abs/2512.12846 |
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| author | Pan, Yue Danieli, Shany Greene, Jenny E. Li, Jiaxuan Leauthaud, Alexie Kado-Fong, Erin Luo, Yifei Mintz, Abby Brooks, Alyson Huang, Song Peter, Annika H. G. Bhattacharyya, Joy Kelvin, Lee S. |
| author_facet | Pan, Yue Danieli, Shany Greene, Jenny E. Li, Jiaxuan Leauthaud, Alexie Kado-Fong, Erin Luo, Yifei Mintz, Abby Brooks, Alyson Huang, Song Peter, Annika H. G. Bhattacharyya, Joy Kelvin, Lee S. |
| contents | We present a statistical census of bright, star-forming satellite galaxies around Milky Way (MW) analogs using the first data release of the Merian Survey. Our sample consists of 393 MW analogs with stellar masses $10^{10.5} < M_{\star, \rm host} < 10^{10.9} M_\odot$ at redshifts $0.07 < z < 0.09$, all central galaxies of their own dark matter halos. Using photometric selection -- including magnitude, color, angular size, photometric redshift, and size-mass cuts -- we identify 793 satellite candidates around these 393 hosts. Our selection leverages two medium-band filters targeting H$α$ and [O \textsc{iii}] emission, enabling a nearly complete sample of star-forming, Magellanic Clouds-like satellites with $M_{\star, \rm sat} \gtrsim 10^{8} M_\odot$. We find that $\sim80\%$ of hosts have 0-3 massive satellites, and $13\pm4\%$ have two satellites (similar to the MW). Satellite abundance correlates with total stellar mass, and we provide significantly improved statistics for the most massive satellites at $\log_{10}[M_{\star, \rm sat}/M_{\odot}] \gtrsim 10$. The completeness-corrected radial distribution is less centrally concentrated than an NFW profile. In contrast, the Milky Way satellites are more centrally concentrated than the 50\% richest Merian systems, but are broadly consistent with the 50\% most centrally concentrated Merian systems. Our results highlight the power of medium-band photometry for satellite identification and provide a key benchmark for studying satellite quenching, environmental effects, and hierarchical galaxy formation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_12846 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Merian Survey: A Statistical Census of Bright Satellites of Milky Way Analogs Pan, Yue Danieli, Shany Greene, Jenny E. Li, Jiaxuan Leauthaud, Alexie Kado-Fong, Erin Luo, Yifei Mintz, Abby Brooks, Alyson Huang, Song Peter, Annika H. G. Bhattacharyya, Joy Kelvin, Lee S. Astrophysics of Galaxies We present a statistical census of bright, star-forming satellite galaxies around Milky Way (MW) analogs using the first data release of the Merian Survey. Our sample consists of 393 MW analogs with stellar masses $10^{10.5} < M_{\star, \rm host} < 10^{10.9} M_\odot$ at redshifts $0.07 < z < 0.09$, all central galaxies of their own dark matter halos. Using photometric selection -- including magnitude, color, angular size, photometric redshift, and size-mass cuts -- we identify 793 satellite candidates around these 393 hosts. Our selection leverages two medium-band filters targeting H$α$ and [O \textsc{iii}] emission, enabling a nearly complete sample of star-forming, Magellanic Clouds-like satellites with $M_{\star, \rm sat} \gtrsim 10^{8} M_\odot$. We find that $\sim80\%$ of hosts have 0-3 massive satellites, and $13\pm4\%$ have two satellites (similar to the MW). Satellite abundance correlates with total stellar mass, and we provide significantly improved statistics for the most massive satellites at $\log_{10}[M_{\star, \rm sat}/M_{\odot}] \gtrsim 10$. The completeness-corrected radial distribution is less centrally concentrated than an NFW profile. In contrast, the Milky Way satellites are more centrally concentrated than the 50\% richest Merian systems, but are broadly consistent with the 50\% most centrally concentrated Merian systems. Our results highlight the power of medium-band photometry for satellite identification and provide a key benchmark for studying satellite quenching, environmental effects, and hierarchical galaxy formation. |
| title | The Merian Survey: A Statistical Census of Bright Satellites of Milky Way Analogs |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2512.12846 |