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Overview of the DESI Legacy Imaging Surveys

  • Authors: Arjun Dey, David J. Schlegel, Dustin Lang, Robert Blum, Kaylan Burleigh, Xiaohui Fan, Joseph R. Findlay, Doug Finkbeiner, David Herrera, Stéphanie Juneau, Martin Landriau, Michael Levi, Ian McGreer, Aaron Meisner, Adam D. Myers, John Moustakas, Peter Nugent, Anna Patej, Edward F. Schlafly, Alistair R. Walker, Francisco Valdes, Benjamin A. Weaver, Christophe Yèche, Hu Zou, Xu Zhou, Behzad Abareshi, T. M. C. Abbott, Bela Abolfathi, C. Aguilera, Shadab Alam, Lori Allen, A. Alvarez, James Annis, Behzad Ansarinejad, Marie Aubert, Jacqueline Beechert, Eric F. Bell, Segev Y. BenZvi, Florian Beutler, Richard M. Bielby, Adam S. Bolton, César Briceño, Elizabeth J. Buckley-Geer, Karen Butler, Annalisa Calamida, Raymond G. Carlberg, Paul Carter, Ricard Casas, Francisco J. Castander, Yumi Choi, Johan Comparat, Elena Cukanovaite, Timothée Delubac, Kaitlin DeVries, Sharmila Dey, Govinda Dhungana, Mark Dickinson, Zhejie Ding, John B. Donaldson, Yutong Duan, Christopher J. Duckworth, Sarah Eftekharzadeh, Daniel J. Eisenstein, Thomas Etourneau, Parker A. Fagrelius, Jay Farihi, Mike Fitzpatrick, Andreu Font-Ribera, Leah Fulmer, Boris T. Gänsicke, Enrique Gaztanaga, Koshy George, David W. Gerdes, Satya Gontcho A Gontcho, Claudio Gorgoni, Gregory Green, Julien Guy, Diane Harmer, M. Hernandez, Klaus Honscheid, Lijuan (Wendy) Huang, David James, Buell T. Jannuzi, Linhua Jiang, Richard Joyce, Armin Karcher, Sonia Karkar, Robert Kehoe, Jean-Paul, Kneib, Andrea Kueter-Young, Ting-Wen Lan, Tod Lauer, Laurent Le Guillou, Auguste Le Van Suu, Jae Hyeon Lee, Michael Lesser, Laurence Perreault Levasseur, Ting S. Li, Justin L. Mann, Bob Marshall, C. E. Martínez-Vázquez, Paul Martini, Hélion du Mas des Bourboux, Sean McManus, Tobias Gabriel Meier, Brice Ménard, Nigel Metcalfe, Andrea Muñoz-Gutiérrez, Joan Najita, Kevin Napier, Gautham Narayan, Jeffrey A. Newman, Jundan Nie, Brian Nord, Dara J. Norman, Knut A. G. Olsen, Anthony Paat, Nathalie Palanque-Delabrouille, Xiyan Peng, Claire L. Poppett, Megan R. Poremba, Abhishek Prakash, David Rabinowitz, Anand Raichoor, Mehdi Rezaie, A. N. Robertson, Natalie A. Roe, Ashley J. Ross, Nicholas P. Ross, Gregory Rudnick, Sasha Safonova, Abhijit Saha, F. Javier Sánchez, Elodie Savary, Heidi Schweiker, Adam Scott, Hee-Jong Seo, Huanyuan Shan, David R. Silva, Zachary Slepian, Christian Soto, David Sprayberry, Ryan Staten, Coley M. Stillman, Robert J. Stupak, David L. Summers, Suk Sien Tie, H. Tirado, Mariana Vargas-Magaña, A. Katherina Vivas, Risa H. Wechsler, Doug Williams, Jinyi Yang, Qian Yang, Tolga Yapici, Dennis Zaritsky, A. Zenteno, Kai Zhang, Tianmeng Zhang, Rongpu Zhou, and Zhimin Zhou

2019 The Astronomical Journal 157 168.

  • Provider: AAS Journals

Caption: Figure 9.

Forced photometry using The Tractor, contrasted with traditional “catalog-matching.” Left: color–color diagram of catalog-matched PSF sources from the Legacy Surveys and AllWISE catalogs. Right: color–color diagram of PSF sources from the Legacy Survey catalogs that have no matching object in the AllWISE catalog. Many of these will be sources that are well detected in the Legacy Surveys optical imaging, but below the detection threshold in the WISE imaging. We have applied a cut to show only WISE flux measurements above 3σ; with this cut, we nearly double the number of sources with measured WISE fluxes. The distributions shown in both panels are similar, demonstrating that the forced photometry measurements of the faint mid-infrared sources make astrophysical sense, despite being noisier.

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