DOE OSTI · 3007061
Stellar reddening map from DESI imaging and spectroscopy
Abstract
We present new Galactic reddening maps of the high Galactic latitude sky using DESI imaging and spectroscopy. We directly measure the reddening of 2.6 million stars by comparing the observed stellar colors in $g-r$ and $r-z$ from DESI imaging with the synthetic colors derived from DESI spectra from the first two years of the survey. The reddening in the two colors is on average consistent with the Fitzpatrick (1999) extinction curve with $R_\mathrm{V}=3.1$ . We find that our reddening maps differ significantly from the commonly used Schlegel et al. (1998) (SFD) reddening map (by up to 80 mmag in $E(B-V)$ ), and we attribute most of this difference to systematic errors in the SFD map. To validate the reddening map, we select a galaxy sample with extinction correction based on our reddening map, and this yields significantly better uniformity than the SFD extinction correction. Finally, we discuss the potential systematic errors in the DESI reddening measurements, including the photometric calibration errors that are the limiting factor on our accuracy. The $E(g-r)$ and $E(r-z)$ maps presented in this work, and for convenience their corresponding $E(B-V)$ maps with SFD calibration, are publicly available.
Explore related subjects
Keep this discovery
Explore connections, maps & timelines
Zhou, Rongpu [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000153814372), Guy, Julien [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Koposov, Sergey E. [Univ. of Edinburgh, Scotland (United Kingdom); Univ. of Cambridge (United Kingdom)], Schlafly, Edward F. [Space Telescope Science Institute, Baltimore, MD (United States)], Schlegel, David [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Aguilar, Jessica [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Ahlen, Steven [Boston Univ., MA (United States)], Bailey, Stephen [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Bianchi, David [Univ. degli Studi di Milano (Italy)] (ORCID:0000000197120006), Brooks, David [Univ. College London (United Kingdom)], Chaussidon, Edmond [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000189964874), Claybaugh, Todd [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Dawson, Kyle [Univ. of Utah, Salt Lake City, UT (United States)], de la Macorra, Axel [Univ. Nacional Autonoma de Mexico (UNAM), Mexico City (Mexico)], Dey, Arjun [National Optical-Infrared Astronomy Research Laboratory (NOIRLab), Tucson, AZ (United States)], Dey, Biprateep [Univ. of Pittsburgh, PA (United States)], Eisenstein, Daniel J. [Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)], Ferraro, Simone [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)] (ORCID:0000000349927854), Font-Ribera, Andreu [Univ. College London (United Kingdom); Inst. for High Energy Physics (IFAE), Barcelona (Spain)], Forero-Romero, Jaime E. [Univ. of the Andes (Colombia)], Gaztañaga, Enrique [Institut d'Estudis Espacials de Catalunya (IEEC), Barcelona (Spain); Univ. of Portsmouth (United Kingdom); Univ. Autonoma de Barcelona (Spain). Institute of Space Sciences (ICE, CSIC)], Gontcho A. Gontcho, Satya [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Gutierrez, Gaston [Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)] (ORCID:0000000308250517), Honscheid, Klaus [The Ohio State Univ., Columbus, OH (United States)], Juneau, Stephanie [National Optical-Infrared Astronomy Research Laboratory (NOIRLab), Tucson, AZ (United States)], Kehoe, Robert [Southern Methodist Univ., Dallas, TX (United States)], Kirkby, David [Univ. of California, Irvine, CA (United States)], Kisner, Theodore [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Kremin, Anthony [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Lambert, Andrew [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Landriau, Martin [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Le Guillou, Laurent [Sorbonne Univ., Paris (France)], Levi, Michael E. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Li, Ting S. [Univ. of Toronto, ON (Canada)], Manera, Marc [Inst. for High Energy Physics (IFAE), Barcelona (Spain); Univ. Autonoma de Barcelona (Spain)], Martini, Paul [The Ohio State Univ., Columbus, OH (United States)], Meisner, Aaron [National Optical-Infrared Astronomy Research Laboratory (NOIRLab), Tucson, AZ (United States)], Miquel, Ramon [Univ. Autonoma de Barcelona (Spain). Inst. Catalana de Recerca i Estudis Avancats (ICREA) and Inst. de Fisica d'Altes Energies (IFAE)], Moustakas, John [Siena College, Loudonville, NY (United States)], Myers, Adam D. [Univ. of Wyoming, Laramie, WY (United States)], Newman, Jeffrey A. [Univ. of Pittsburgh, PA (United States)], Niz, Gustavo [Univ. of Guanajuato (Mexico); Inst. for Advanced Cosmology (Mexico) ] (ORCID:0000000215448946), Palanque-Delabrouille, Nathalie [Univ. Paris-Saclay, Gif-sur-Yvette (France); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Percival, Will J. [Univ. of Waterloo, ON (Canada); Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)], Poppett, Claire [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)], Prada, Francisco [Univ. of Granada (Spain)], Raichoor, Anand [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Ross, Ashley J. [The Ohio State Univ., Columbus, OH (United States)], Rossi, Graziano [Sejong Univ., Seoul (Korea, Republic of)], Sanchez, Eusebio [Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain)] (ORCID:0000000296468198), Saydjari, Andrew K. [Princeton Univ., NJ (United States)] (ORCID:0000000265619002), Schubnell, Michael [Univ. of Michigan, Ann Arbor, MI (United States)], Sprayberry, David [National Optical-Infrared Astronomy Research Laboratory (NOIRLab), Tucson, AZ (United States)] (ORCID:0000000175836441), Tarlé, Gregory [Univ. of Michigan, Ann Arbor, MI (United States)], Weaver, Benjamin A. [National Optical-Infrared Astronomy Research Laboratory (NOIRLab), Tucson, AZ (United States)], Zarrouk, Pauline [Sorbonne Univ., Paris (France)], Zou, Hu [Chinese Academy of Sciences (CAS), Beijing (China)] (ORCID:0000000266843997). 2025-07-01. Stellar reddening map from DESI imaging and spectroscopy. https://doi.org/10.33232/001c.141680
Cite the original work for its findings. Save a collection to share your selection of sources.