Stellar reddening map from DESI imaging and spectroscopy
Abstrak
We present new Galactic dust 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.
Topik & Kata Kunci
Penulis (57)
Rongpu Zhou
Julien Guy
Sergey E. Koposov
Edward F. Schlafly
David Schlegel
Jessica Aguilar
Steven Ahlen
Stephen Bailey
David Bianchi
David Brooks
Edmond Chaussidon
Todd Claybaugh
Kyle Dawson
Axel de la Macorra
Arjun Dey
Biprateep Dey
Daniel J. Eisenstein
Simone Ferraro
Andreu Font-Ribera
Jaime E. Forero-Romero
Enrique Gaztañaga
Satya Gontcho A Gontcho
Gaston Gutierrez
Klaus Honscheid
Stephanie Juneau
Robert Kehoe
David Kirkby
Theodore Kisner
Anthony Kremin
Andrew Lambert
Martin Landriau
Laurent Le Guillou
Michael E. Levi
Ting S. Li
Marc Manera
Paul Martini
Aaron Meisner
Ramon Miquel
John Moustakas
Adam D. Myers
Jeffrey A. Newman
Gustavo Niz
Nathalie Palanque-Delabrouille
Will J. Percival
Claire Poppett
Francisco Prada
Anand Raichoor
Ashley J. Ross
Graziano Rossi
Eusebio Sanchez
Andrew K. Saydjari
Michael Schubnell
David Sprayberry
Gregory Tarl
Benjamin A. Weaver
Pauline Zarrouk
Hu Zou
Akses Cepat
- Tahun Terbit
- 2024
- Bahasa
- en
- Sumber Database
- arXiv
- Akses
- Open Access ✓