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.; Gaztañaga, Enrique; Gontcho A Gontcho, Satya; Gutierrez, Gaston; Honscheid, Klaus; Ishak, Mustapha; Kisner, Theodore; Landriau, Martin; Le Guillou, Laurent; 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; Tarlé, Gregory; Weaver, Benjamin Alan; Zou, Hu

Abstract

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 Mr,sat ∼ −7, around ICGs as small as 7.1

Citation

Wang, W., Yang, X., Jing, Y., Ross, A. J., Siudek, M., Moustakas, J., Moore, S. G., Cole, S., Frenk, C., Yu, J., Koposov, S. E., Han, J., Tan, Z., Xu, K., Gu, Y., Wang, Y., Gnedin, O. Y., Aguilar, J. N., Ahlen, S., …Zou, H. (2025). Luminosity and Stellar Mass Functions of Faint Photometric Satellites around Spectroscopic Central Galaxies from DESI Year-1 Bright Galaxy Survey. The Astrophysical Journal, 986(2). https://doi.org/10.3847/1538-4357/add5df

• Journal Article Type: Article
• Acceptance Date: May 2, 2025
• Online Publication Date: Jun 19, 2025
• Publication Date: Jun 20, 2025
• Deposit Date: Jun 30, 2025
• Publicly Available Date: Jun 30, 2025
• Journal: The Astrophysical Journal
• Electronic ISSN: 1538-4357
• Peer Reviewed: Peer Reviewed
• Volume: 986
• Issue: 2
• DOI: https://doi.org/10.3847/1538-4357/add5df
• Keywords: Galaxy evolution, Galaxy luminosities, Galaxy counts, Galaxy groups
• Public URL: https://durham-repository.worktribe.com/output/4115115