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Luminosity and Stellar Mass Functions of Faint Photometric Satellites around Spectroscopic Central Galaxies from DESI Year-1 Bright Galaxy Survey

Journal Article · · The Astrophysical Journal
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  1. Shanghai Jiao Tong Univ. (China)
  2. The Ohio State Univ., Columbus, OH (United States)
  3. Consejo Superior de Investigaciones Cientificas (CSIC), Barcelona (Spain). Institute of Space Sciences (ICE-CSIC); Instituto Astrofisica de Canarias, La Laguna (Spain)
  4. Siena College, Loudonville, NY (United States)
  5. Durham University (United Kingdom)
  6. Univ. of Tokyo (Japan). Kavli IPMU
  7. Univ. of Edinburgh, Scotland (United Kingdom); Univ. of Cambridge (United Kingdom)
  8. Univ. of Pennsylvania, Philadelphia, PA (United States)
  9. Univ. of Michigan, Ann Arbor, MI (United States)
  10. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  11. Boston Univ., MA (United States)
  12. Univ. degli Studi di Milano (Italy); Istituto Nazionale di Astrofisica (INAF), Milano (Italy). Osservatorio Astronomico di Brera
  13. University College London (United Kingdom)
  14. Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de Mexico (Mexico); Instituto Nacional de Investigaciones Nucleares, Ocoyoacac (Mexico); Univ. de Guanajuato (Mexico); Universidad Nacional Autónoma de México, Ciudad de Mexico (Mexico)
  15. NSF NOIRLab, Tucson, AZ (United States)
  16. Universidad de los Andes, Bogotá (Colombia)
  17. Institut d’Estudis Espacials de Catalunya (IEEC), Castelldefels (Spain); Univ. of Portsmouth (United Kingdom)
  18. Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
  19. Univ. of Texas at Dallas, Richardson, TX (United States)
  20. Sorbonne Univ., Paris (France)
  21. Barcelona Institute of Science and Technology (BIST) (Spain); Univ. Autonoma de Barcelona (Spain)
  22. Barcelona Institute of Science and Technology (BIST) (Spain); Institució Catalana de Recerca i Estudis Avançats, Barcelona (Spain)
  23. Univ. of Portsmouth (United Kingdom)
  24. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States). Space Sciences Lab.
  25. Univ. Autonoma de Madrid (Spain); Instituto de Astrofísica de Andalucía (CSIC)
  26. Universitat Politècnica de Catalunya, Barcelona (Spain)
  27. Sejong University, Seoul (South Korea)
  28. Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain)
  29. Ohio Univ., Athens, OH (United States)
  30. NSF NOIRLab, Tucson, AZ (United States); New York Univ. (NYU), NY (United States)
  31. Chinese Academy of Sciences (CAS), Beijing (China). National Astronomical Observatories
+ Show Author Affiliations
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 < log10M*,ICG/M⊙ < 7.8, with the stellar mass of ICGs measured by the DESI Fastspecfit pipeline. The satellite SMF can be measured down to log10M*,sat/M⊙ ~ 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 can be −2.298 ± 0.656 and −2.888 ± 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 < log10M*,ICG/M⊙ < 11.7, showing reasonable agreement, but we show that 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 active galactic nuclei based on Wide-field Infrared Survey Explorer photometry, and we find good agreements in the measured satellite LFs by using either of the DESI stellar mass catalogs.
Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of Texas at Dallas, Richardson, TX (United States)
Sponsoring Organization:
National Key R&D Program of China; National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); Spanish Ministry of Science and Innovation; USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
89243024CSC000002; AC02-05CH11231; SC0020086; SC0022184
OSTI ID:
2551814
Alternate ID(s):
OSTI ID: 3010024
Report Number(s):
FERMILAB-PUB--25-0181-PPD; oai:inspirehep.net:2897209; arXiv:2503.03317
Journal Information:
The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 986; ISSN 0004-637X; ISSN 1538-4357
Publisher:
American Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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