基于 DESI 成像与光谱的星际尘埃地图
星系天体物理
2025-07-08 v3 宇宙学与河外天体物理
摘要
我们展示了使用 DESI 成像和光谱数据绘制的新型银河系高 Galactic 纬度天区的尘埃衰减地图。我们直接测量了通过将 DESI 成像中观测到的 和 恒星颜色与来自 DESI 光谱（来自前两年调查）推导的合成颜色进行比较，对 260 万颗恒星进行衰减测量。两种颜色的衰减在平均上与 的 Fitzpatrick (1999) 衰减曲线一致。我们发现，所得衰减地图与常用 Schlegel et al. (1998) (SFD) 衰减地图存在显著差异（ 最多可达 80 mmag），并将此差异大多归因于 SFD 地图的系统误差。为了验证衰减地图，我们选取一组基于所得衰减地图进行消除校正的星系样本，结果显示其均匀性显著优于 SFD 消除校正。最后，我们讨论了 DESI 衰减测量中的潜在系统误差，包括光度标定误差，这是影响我们准确性的限制因素。本文所呈现的 和 地图，为便于参考，其对应的 地图（经 SFD 标定）已公开发布。
引用
@article{arxiv.2409.05140,
title = {Stellar reddening map from DESI imaging and spectroscopy},
author = {Rongpu Zhou and Julien Guy and Sergey E. Koposov and Edward F. Schlafly and David Schlegel and Jessica Aguilar and Steven Ahlen and Stephen Bailey and David Bianchi and David Brooks and Edmond Chaussidon and Todd Claybaugh and Kyle Dawson and Axel de la Macorra and Arjun Dey and Biprateep Dey and Daniel J. Eisenstein and Simone Ferraro and Andreu Font-Ribera and Jaime E. Forero-Romero and Enrique Gaztañaga and Satya Gontcho A Gontcho and Gaston Gutierrez and Klaus Honscheid and Stephanie Juneau and Robert Kehoe and David Kirkby and Theodore Kisner and Anthony Kremin and Andrew Lambert and Martin Landriau and Laurent Le Guillou and Michael E. Levi and Ting S. Li and Marc Manera and Paul Martini and Aaron Meisner and Ramon Miquel and John Moustakas and Adam D. Myers and Jeffrey A. Newman and Gustavo Niz and Nathalie Palanque-Delabrouille and Will J. Percival and Claire Poppett and Francisco Prada and Anand Raichoor and Ashley J. Ross and Graziano Rossi and Eusebio Sanchez and Andrew K. Saydjari and Michael Schubnell and David Sprayberry and Gregory Tarl and Benjamin A. Weaver and Pauline Zarrouk and Hu Zou},
journal= {arXiv preprint arXiv:2409.05140},
year = {2025}
}
备注
22 pages, 17 figures. Map data: https://data.desi.lbl.gov/public/papers/mws/desi_dust/y2/v1/maps/. DR1 Value-added Catalogs: https://data.desi.lbl.gov/doc/releases/dr1/vac/stellar-reddening/