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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2503.03317 |
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| _version_ | 1866916719113535488 |
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| author | Wang, Wenting Yang, Xiaohu Jing, Yipeng Ross, Ashley J. Siudek, Malgorzata Moustakas, John Moore, Samuel G. Cole, Shaun Frenk, Carlos Yu, Jiaxi Koposov, Sergey E. Han, Jiaxin Tan, Zhenlin Xu, Kun Gu, Yizhou Wang, Yirong Gnedin, Oleg Y. Aguilar, Jessica Nicole Ahlen, Steven Bianchi, Davide Brooks, David Claybaugh, Todd de la Macorra, Axel Dey, Arjun Doel, Peter Forero-Romero, Jaime E. Gaztanaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Honscheid, Klaus Ishak, Mustapha Kisner, Theodore Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Ramon Nadathur, Seshadri Poppett, Claire Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Seo, Hee-Jong Silber, Joseph Harry Sprayberry, David Tarle, Gregory Weaver, Benjamin Alan Zou, Hu |
| author_facet | Wang, Wenting Yang, Xiaohu Jing, Yipeng Ross, Ashley J. Siudek, Malgorzata Moustakas, John Moore, Samuel G. Cole, Shaun Frenk, Carlos Yu, Jiaxi Koposov, Sergey E. Han, Jiaxin Tan, Zhenlin Xu, Kun Gu, Yizhou Wang, Yirong Gnedin, Oleg Y. Aguilar, Jessica Nicole Ahlen, Steven Bianchi, Davide Brooks, David Claybaugh, Todd de la Macorra, Axel Dey, Arjun Doel, Peter Forero-Romero, Jaime E. Gaztanaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Honscheid, Klaus Ishak, Mustapha Kisner, Theodore Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Ramon Nadathur, Seshadri Poppett, Claire Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Seo, Hee-Jong Silber, Joseph Harry Sprayberry, David Tarle, Gregory Weaver, Benjamin Alan Zou, Hu |
| contents | We measure the luminosity functions (LFs) and stellar mass functions (SMFs) of photometric satellite galaxies around spectroscopically identified isolated central galaxies (ICGs). The photometric satellites are from the DESI Legacy Imaging Surveys (DR9), while the spectroscopic ICGs are selected from the DESI Year-1 BGS sample. We can measure satellite LFs down to $r$-band absolute magnitudes of $M_{r,\mathrm{sat}}\sim-7$, around ICGs as small as $7.1<\log_{10}M_{\ast,\mathrm{ICG}}/\mathrm{M_\odot}<7.8$, with the stellar mass of ICGs measured by the DESI Fastspecfit pipeline. The satellite SMF can be measured down to $\log_{10}M_{\ast,\mathrm{sat}}/\mathrm{M_\odot}\sim 5.5$. Interestingly, we discover that the faint/low-mass end slopes of satellite LFs/SMFs become steeper with the decrease in the stellar masses of host ICGs, with smaller and nearby host ICGs capable of being used to probe their fainter satellites.. The steepest slopes are $-2.298\pm0.656$ and $-$2.888$\pm$0.916 for satellite LF and SMF, respectively. Detailed comparisons are performed between the satellite LFs around ICGs selected from DESI BGS or from the SDSS NYU-VAGC spectroscopic Main galaxies over $7.1<\log_{10}M_{\ast,\mathrm{ICG}}/\mathrm{M_\odot}<11.7$, showing reasonable agreements, but we show that the differences between DESI and SDSS stellar masses for ICGs play a role to affect the results. We also compare measurements based on DESI Fastspecfit and Cigale stellar masses used to bin ICGs, with the latter including the modeling of AGN based on WISE photometry, and we find good agreements in the measured satellite LFs by using either of the DESI stellar mass catalogs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_03317 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Luminosity and stellar mass functions of faint photometric satellites around spectroscopic central galaxies from DESI Year-1 Bright Galaxy Survey Wang, Wenting Yang, Xiaohu Jing, Yipeng Ross, Ashley J. Siudek, Malgorzata Moustakas, John Moore, Samuel G. Cole, Shaun Frenk, Carlos Yu, Jiaxi Koposov, Sergey E. Han, Jiaxin Tan, Zhenlin Xu, Kun Gu, Yizhou Wang, Yirong Gnedin, Oleg Y. Aguilar, Jessica Nicole Ahlen, Steven Bianchi, Davide Brooks, David Claybaugh, Todd de la Macorra, Axel Dey, Arjun Doel, Peter Forero-Romero, Jaime E. Gaztanaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Honscheid, Klaus Ishak, Mustapha Kisner, Theodore Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Ramon Nadathur, Seshadri Poppett, Claire Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Seo, Hee-Jong Silber, Joseph Harry Sprayberry, David Tarle, Gregory Weaver, Benjamin Alan Zou, Hu Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We measure the luminosity functions (LFs) and stellar mass functions (SMFs) of photometric satellite galaxies around spectroscopically identified isolated central galaxies (ICGs). The photometric satellites are from the DESI Legacy Imaging Surveys (DR9), while the spectroscopic ICGs are selected from the DESI Year-1 BGS sample. We can measure satellite LFs down to $r$-band absolute magnitudes of $M_{r,\mathrm{sat}}\sim-7$, around ICGs as small as $7.1<\log_{10}M_{\ast,\mathrm{ICG}}/\mathrm{M_\odot}<7.8$, with the stellar mass of ICGs measured by the DESI Fastspecfit pipeline. The satellite SMF can be measured down to $\log_{10}M_{\ast,\mathrm{sat}}/\mathrm{M_\odot}\sim 5.5$. Interestingly, we discover that the faint/low-mass end slopes of satellite LFs/SMFs become steeper with the decrease in the stellar masses of host ICGs, with smaller and nearby host ICGs capable of being used to probe their fainter satellites.. The steepest slopes are $-2.298\pm0.656$ and $-$2.888$\pm$0.916 for satellite LF and SMF, respectively. Detailed comparisons are performed between the satellite LFs around ICGs selected from DESI BGS or from the SDSS NYU-VAGC spectroscopic Main galaxies over $7.1<\log_{10}M_{\ast,\mathrm{ICG}}/\mathrm{M_\odot}<11.7$, showing reasonable agreements, but we show that the differences between DESI and SDSS stellar masses for ICGs play a role to affect the results. We also compare measurements based on DESI Fastspecfit and Cigale stellar masses used to bin ICGs, with the latter including the modeling of AGN based on WISE photometry, and we find good agreements in the measured satellite LFs by using either of the DESI stellar mass catalogs. |
| title | Luminosity and stellar mass functions of faint photometric satellites around spectroscopic central galaxies from DESI Year-1 Bright Galaxy Survey |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2503.03317 |