The Dark Energy Survey Year 3 and eBOSS: constraining galaxy intrinsic alignments across luminosity and colour space

Journal Article · 06 July 2023 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stad2013 · OSTI ID:1989965

Samuroff, S. ; Mandelbaum, R.; Blazek, J.; Campos, A.; MacCrann, N.; Zacharegkas, G.; Amon, A.; Prat, J.; Singh, S.; Elvin-Poole, J.; Ross, A. J.; Alarcon, A.; Baxter, E.; Bechtol, K.; Becker, M. R.; Bernstein, G. M.; Rosell, A. Carnero; Kind, M. Carrasco; Cawthon, R.; Chang, C. ; Chen, R.; Choi, A.; Crocce, M.; Davis, C.; DeRose, J.; Dodelson, S.; Doux, C.; Drlica-Wagner, A.; Eckert, K.; Everett, S.; Ferté, A.; Gatti, M.; Giannini, G.; Gruen, D.; Gruendl, R. A.; Harrison, I.; Herner, K.; Huff, E. M.; Jarvis, M.; Kuropatkin, N.; Leget, P-F; Lemos, P.; McCullough, J.; Myles, J.; Navarro-Alsina, A.; Pandey, S.; Porredon, A.; Raveri, M.; Rodriguez-Monroy, M.; Rollins, R. P.; Roodman, A.; Rossi, G.; Rykoff, E. S.; Sánchez, C.; Secco, L. F.; Sevilla-Noarbe, I.; Sheldon, E.; Shin, T.; Troxel, M. A.; Tutusaus, I.; Weaverdyck, N.; Yanny, B.; Yin, B.; Zhang, Y.; Zuntz, J.; Aguena, M.; Alves, O.; Annis, J.; Bacon, D.; Bertin, E.; Bocquet, S.; Brooks, D.; Burke, D. L.; Carretero, J.; Costanzi, M.; da Costa, L. N.; Pereira, M. E. S.; De Vicente, J.; Desai, S.; Diehl, H. T.; Dietrich, J. P.; Doel, P.; Ferrero, I.; Flaugher, B.; Frieman, J.; García-Bellido, J.; Hinton, S. R.; Hollowood, D. L.; Honscheid, K.; James, D. J.; Kuehn, K.; Lahav, O.; Marshall, J. L.; Melchior, P.; Mena-Fernández, J.; Menanteau, F.; Miquel, R.; Newman, J.; Palmese, A.; Pieres, A.; Malagón, A. A. Plazas; Sanchez, E.; Scarpine, V.; Smith, M.; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; To, C.

ABSTRACT We present direct constraints on galaxy intrinsic alignments (IAs) using the Dark Energy Survey Year 3 (DES Y3), the Extended Baryon Oscillation Spectroscopic Survey (eBOSS), and its precursor, the Baryon Oscillation Spectroscopic Survey (BOSS). Our measurements incorporate photometric red sequence (redMaGiC) galaxies from DES with median redshift z ∼ 0.2–1.0, luminous red galaxies from eBOSS at z ∼ 0.8, and also an SDSS-III BOSS CMASS sample at z ∼ 0.5. We measure two-point IA correlations, which we fit using a model that includes lensing, magnification, and photometric redshift error. Fitting on scales 6 Mpc h−1 < rp < 70 Mpc h−1, we make a detection of IAs in each sample, at 5σ–22σ (assuming a simple one-parameter model for IAs). Using these red samples, we measure the IA–luminosity relation. Our results are statistically consistent with previous results, but offer a significant improvement in constraining power, particularly at low luminosity. With this improved precision, we see detectable dependence on colour between broadly defined red samples. It is likely that a more sophisticated approach than a binary red/blue split, which jointly considers colour and luminosity dependence in the IA signal, will be needed in future. We also compare the various signal components at the best-fitting point in parameter space for each sample, and find that magnification and lensing contribute $$\sim 2\!-\!18~{{\ \rm per\ cent}}$$ of the total signal. As precision continues to improve, it will certainly be necessary to account for these effects in future direct IA measurements. Finally, we make equivalent measurements on a sample of emission-line galaxies from eBOSS at z ∼ 0.8. We constrain the non-linear alignment amplitude to be $$A_1=0.07^{+0.32}_{-0.42}$$ (|A1| < 0.78 at 95 per cent CL).

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States); Australian Astron. Observ.; Barcelona, Autonoma U.; Barcelona, IEEC; Barcelona, IFAE; Brookhaven National Laboratory (BNL), Upton, NY (United States); Caltech, JPL; Cambridge U., DAMTP; Cambridge U., Inst. of Astron.; Campinas State U.; Cardiff U.; Carnegie Mellon U.; Carnegie Mellon University, Pittsburgh, PA (United States); Chicago U., Astron. Astrophys. Ctr.; Chicago U., EFI; Chicago U., KICP; Duke U.; Edinburgh U., Inst. Astron.; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Geneva U., Dept. Theor. Phys.; Hamburg Observ.; Harvard-Smithsonian Ctr. Astrophys.; IAC, La Laguna; ICREA, Barcelona; IFPU, Trieste; INFN, Genoa; INFN, Trieste; Illinois U., Urbana, Astron. Dept.; Indian Inst. Tech., Hyderabad; Inst. Astron., Honolulu; Inst. Theor. Astrophys., Oslo; Jodrell Bank; LIneA, Rio de Janeiro; LPSC, Grenoble; Laguna U., Tenerife; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Lowell Observ.; MIT, Cambridge, Dept. Phys.; Madrid, CIEMAT; Madrid, Escuela Tec. Sup. Ing. Ind.; Madrid, IFT; Munich U.; NASA, Goddard; NCSA, Urbana; Northeastern U.; Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Ohio State U., CCAPP; Paris, Inst. Astrophys.; Pittsburgh U.; Portsmouth U., ICG; Princeton U., Astrophys. Sci. Dept.; Queensland U.; SISSA, Trieste; SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); SUNY, Stony Brook; Sejong U.; Southampton U.; Stanford U.; Texas A-M; Trieste Observ.; U. Michigan, Ann Arbor; U. Montreal (main); UC, Berkeley, Astron. Dept.; UC, Santa Cruz; UPenn, Philadelphia; University Coll. London; Waterloo U.; William-Mary Coll.; Wisconsin U., Madison
• Sponsoring Organization: Alfred P. Sloan Foundation; National Science Foundation (NSF); US Department of Energy; USDOE; USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: DES Collaboration
• Grant/Contract Number: 89243024CSC000002; AC02-05CH11231; AC02-07CH11359; AC02-76SF00515; AC05-00OR22725; SC0010118
• OSTI ID: 1989965
• Report Number(s): DES--2021-0657; DES-2021-0657; FERMILAB--PUB-22-914-PPD; FERMILAB-PUB--22-914-PPD; FERMILAB-PUB-22-914-PPD; TRN: US2409012; arXiv:2212.11319
• Journal Information: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 2 Vol. 524; ISSN 0035-8711
• Publisher: Oxford University PressCopyright Statement
• Country of Publication: United Kingdom
• Language: English