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Measurements of the Thermal Sunyaev-Zel'dovich Effect with ACT and DESI Luminous Red Galaxies

Journal Article · · TBD
OSTI ID:2538637
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  1. UC, Berkeley; LBNL, Berkeley; LBL, Berkeley
  2. LBNL, Berkeley; UC, Berkeley; LBL, Berkeley
  3. SLAC
  4. LBNL, Berkeley
  5. Boston U.
  6. Cornell U., LNS; APC, Paris
  7. Milan U.
  8. University Coll. London
  9. Durham U., ICC
  10. Cambridge U., Inst. of Astron.; Cambridge U., DAMTP
  11. UNAM, Mexico
  12. Natl. Solar Observ., Tucson
  13. KIPAC, Menlo Park; UC, Berkeley; LBL, Berkeley
  14. Andes U., Bogota
  15. Barcelona, IEEC; Portsmouth U., ICG; ICE, Bellaterra
  16. Cornell U., LNS
  17. Munich, Tech. U., Universe; Munich U.
  18. Fermilab
  19. Chicago U., KICP; Ohio State U.
  20. Queensland U.
  21. Southern Methodist U.
  22. Cambridge U., Inst. of Astron.
  23. LPNHE, Paris
  24. Barcelona, IFAE
  25. Barcelona, IFAE; Barcelona, Autonoma U.
  26. Chicago U., KICP; Ohio State U., Dept. Astron.; Ohio State U.
  27. ICREA, Barcelona; Barcelona, IFAE
  28. KwaZulu Natal U.
  29. Pittsburgh U.
  30. Guanajuato U.; Mexico U., ICN
  31. IRFU, Saclay; LBNL, Berkeley
  32. Waterloo U.; Perimeter Inst. Theor. Phys.
  33. Granada U., Theor. Phys. Astrophys.
  34. Barcelona, Polytechnic U.
  35. Stanford U.; KIPAC, Menlo Park; SLAC
  36. Sejong U.
  37. Madrid, CIEMAT
  38. Michigan U., MCTP; Syracuse U.; Michigan U.; KEK, Tsukuba; Hiroshima Shudo U.
  39. Ohio U., Athens
  40. Valparaiso U., Catolica
  41. Michigan U.; KEK, Tsukuba; Hiroshima Shudo U.
  42. Duke U.; Cornell U.
  43. NASA, Goddard
  44. Beijing Observ.
+ Show Author Affiliations
Cosmic Microwave Background (CMB) photons scatter off the free-electron gas in galaxies and clusters, allowing us to use the CMB as a backlight to probe the gas in and around low-redshift galaxies. The thermal Sunyaev-Zel'dovich effect, sourced by hot electrons in high-density environments, measures the thermal pressure of the target objects, shedding light on halo thermodynamics and galaxy formation and providing a path toward understanding the baryon distribution around cosmic structures. We use a combination of high-resolution CMB maps from the Atacama Cosmology Telescope (ACT) and photometric luminous red galaxy (LRG) catalogues from the Dark Energy Spectroscopic Instrument (DESI) to measure the thermal Sunyaev-Zel'dovich signal in four redshift bins from $z=0.4$ to $z=1.2$, with a combined detection significance of 19$$\sigma$$ when stacking on the fiducial CMB Compton-$$y$$ map. We discuss possible sources of contamination, finding that residual dust emission associated with the target galaxies is important and limits current analyses. We discuss several mitigation strategies and quantify the residual modelling uncertainty. This work complements closely-related measurements of the kinematic Sunyaev-Zel'dovich and weak lensing of the same galaxies.
Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
DOE Contract Number:
89243024CSC000002
OSTI ID:
2538637
Report Number(s):
FERMILAB-PUB-25-0094-PPD; arXiv:2502.08850; oai:inspirehep.net:2879768
Journal Information:
TBD, Journal Name: TBD
Country of Publication:
United States
Language:
English

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