Photometric Redshifts with the LSST. II. The Impact of Near-infrared and Near-ultraviolet Photometry
Abstract
Accurate photometric redshift (photo-z) estimates are essential to the cosmological science goals of the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). In this work, we use simulated photometry for mock galaxy catalogs to explore how LSST photo-z estimates can be improved by the addition of near-infrared (NIR) and/or ultraviolet (UV ) photometry from the Euclid, Wide-Field InfrarRed Survey Telescope (WFIRST), and/or Cosmological Advanced Survey Telescope for Optical and ultraviolet Research (CASTOR) space telescopes. Generally, we find that deeper optical photometry can reduce the standard deviation of the photo-z estimates more than adding NIR or UV filters but that additional filters are the only way to significantly lower the fraction of galaxies with catastrophically under- or overestimated photo-z. For Euclid, we find that the addition of JH 5σ photometric detections can reduce the standard deviation for galaxies with z > 1 (z > 0.3) by ~20% (~10%), and the fraction of outliers by ~40% (~25%). For WFIRST, we show how the addition of deep YJHK photometry could reduce the standard deviation by ≳50% at z > 1.5 and drastically reduce the fraction of outliers to just ~2% overall. For CASTOR, we find that the addition of itsmore »
- Authors:
-
- Univ. of Washington, Seattle, WA (United States). DiRAC Institute, Dept. of Astronomy
- University of California, Davis, Davis, CA (United States). Dept. of Physics
- National Research Council of Canada, Victoria (Canada)
- Publication Date:
- Research Org.:
- Univ. of California, Davis, CA (United States); Univ. of Washington, Seattle, WA (United States); Stanford Univ., CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1802007
- Grant/Contract Number:
- SC0009999; SC0011635; AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astronomical Journal (Online)
- Additional Journal Information:
- Journal Name: The Astronomical Journal (Online); Journal Volume: 159; Journal Issue: 6; Journal ID: ISSN 1538-3881
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics
Citation Formats
Graham, Melissa L., Connolly, Andrew J., Wang, Winnie, Schmidt, Samuel J., Morrison, Christopher B., Ivezić, Željko, Fabbro, Sébastien, Côté, Patrick, Daniel, Scott F., Jones, R. Lynne, Jurić, Mario, Yoachim, Peter, and Kalmbach, J. Bryce. Photometric Redshifts with the LSST. II. The Impact of Near-infrared and Near-ultraviolet Photometry. United States: N. p., 2020.
Web. doi:10.3847/1538-3881/ab8a43.
Graham, Melissa L., Connolly, Andrew J., Wang, Winnie, Schmidt, Samuel J., Morrison, Christopher B., Ivezić, Željko, Fabbro, Sébastien, Côté, Patrick, Daniel, Scott F., Jones, R. Lynne, Jurić, Mario, Yoachim, Peter, & Kalmbach, J. Bryce. Photometric Redshifts with the LSST. II. The Impact of Near-infrared and Near-ultraviolet Photometry. United States. https://doi.org/10.3847/1538-3881/ab8a43
Graham, Melissa L., Connolly, Andrew J., Wang, Winnie, Schmidt, Samuel J., Morrison, Christopher B., Ivezić, Željko, Fabbro, Sébastien, Côté, Patrick, Daniel, Scott F., Jones, R. Lynne, Jurić, Mario, Yoachim, Peter, and Kalmbach, J. Bryce. Wed .
"Photometric Redshifts with the LSST. II. The Impact of Near-infrared and Near-ultraviolet Photometry". United States. https://doi.org/10.3847/1538-3881/ab8a43. https://www.osti.gov/servlets/purl/1802007.
@article{osti_1802007,
title = {Photometric Redshifts with the LSST. II. The Impact of Near-infrared and Near-ultraviolet Photometry},
author = {Graham, Melissa L. and Connolly, Andrew J. and Wang, Winnie and Schmidt, Samuel J. and Morrison, Christopher B. and Ivezić, Željko and Fabbro, Sébastien and Côté, Patrick and Daniel, Scott F. and Jones, R. Lynne and Jurić, Mario and Yoachim, Peter and Kalmbach, J. Bryce},
abstractNote = {Accurate photometric redshift (photo-z) estimates are essential to the cosmological science goals of the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST). In this work, we use simulated photometry for mock galaxy catalogs to explore how LSST photo-z estimates can be improved by the addition of near-infrared (NIR) and/or ultraviolet (UV ) photometry from the Euclid, Wide-Field InfrarRed Survey Telescope (WFIRST), and/or Cosmological Advanced Survey Telescope for Optical and ultraviolet Research (CASTOR) space telescopes. Generally, we find that deeper optical photometry can reduce the standard deviation of the photo-z estimates more than adding NIR or UV filters but that additional filters are the only way to significantly lower the fraction of galaxies with catastrophically under- or overestimated photo-z. For Euclid, we find that the addition of JH 5σ photometric detections can reduce the standard deviation for galaxies with z > 1 (z > 0.3) by ~20% (~10%), and the fraction of outliers by ~40% (~25%). For WFIRST, we show how the addition of deep YJHK photometry could reduce the standard deviation by ≳50% at z > 1.5 and drastically reduce the fraction of outliers to just ~2% overall. For CASTOR, we find that the addition of its UV- and u-band photometry could reduce the standard deviation by ~30% and the fraction of outliers by ~50% for galaxies with z < 0.5. We also evaluate the photo-z results within sky areas that overlap with both the NIR and UV surveys and when spectroscopic training sets built from the surveys’ small-area deep fields are used.},
doi = {10.3847/1538-3881/ab8a43},
journal = {The Astronomical Journal (Online)},
number = 6,
volume = 159,
place = {United States},
year = {Wed May 13 00:00:00 EDT 2020},
month = {Wed May 13 00:00:00 EDT 2020}
}
Works referenced in this record:
Simulations of the formation, evolution and clustering of galaxies and quasars
journal, June 2005
- Springel, Volker; White, Simon D. M.; Jenkins, Adrian
- Nature, Vol. 435, Issue 7042
CASTOR: the Cosmological Advanced Survey Telescope for Optical and Ultraviolet Research
conference, September 2012
- Côte, Patrick; Scott, Alan; Balogh, Michael
- SPIE Astronomical Telescopes + Instrumentation, SPIE Proceedings
Lightcone mock catalogues from semi-analytic models of galaxy formation – I. Construction and application to the BzK colour selection
journal, December 2012
- Merson, Alexander I.; Baugh, Carlton M.; Helly, John C.
- Monthly Notices of the Royal Astronomical Society, Vol. 429, Issue 1
Photometric redshift requirements for lens galaxies in galaxy-galaxy lensing analyses: Lensing with photometric redshifts
journal, January 2012
- Nakajima, R.; Mandelbaum, R.; Seljak, U.
- Monthly Notices of the Royal Astronomical Society
The CFHT Large Area U-band Deep Survey (CLAUDS)
journal, September 2019
- Sawicki, Marcin; Arnouts, Stephane; Huang, Jiasheng
- Monthly Notices of the Royal Astronomical Society
The Canada–France Imaging Survey: First Results from the u-Band Component
journal, October 2017
- Ibata, Rodrigo A.; McConnachie, Alan; Cuillandre, Jean-Charles
- The Astrophysical Journal, Vol. 848, Issue 2
Spectroscopic needs for imaging dark energy experiments
journal, March 2015
- Newman, Jeffrey A.; Abate, Alexandra; Abdalla, Filipe B.
- Astroparticle Physics, Vol. 63
The Euclid mission design
conference, July 2016
- Racca, Giuseppe D.; Laureijs, René; Stagnaro, Luca
- SPIE Astronomical Telescopes + Instrumentation, SPIE Proceedings
Scientific Synergy between LSST and Euclid
journal, December 2017
- Rhodes, Jason; Nichol, Robert C.; Aubourg, Éric
- The Astrophysical Journal Supplement Series, Vol. 233, Issue 2
PHAT: PHoto- z Accuracy Testing
journal, November 2010
- Hildebrandt, H.; Arnouts, S.; Capak, P.
- Astronomy & Astrophysics, Vol. 523
Photometric Redshifts with the LSST: Evaluating Survey Observing Strategies
journal, January 2018
- Graham, Melissa L.; Connolly, Andrew J.; Ivezić, Željko
- The Astronomical Journal, Vol. 155, Issue 1
An Atlas of Galaxy Spectral Energy Distributions from the Ultraviolet to the Mid-Infrared
journal, May 2014
- Brown, Michael J. I.; Moustakas, John; Smith, J. -D. T.
- The Astrophysical Journal Supplement Series, Vol. 212, Issue 2
How sensitive are predicted galaxy luminosities to the choice of stellar population synthesis model?
journal, February 2014
- Gonzalez-Perez, V.; Lacey, C. G.; Baugh, C. M.
- Monthly Notices of the Royal Astronomical Society, Vol. 439, Issue 1
The many flavours of photometric redshifts
journal, June 2018
- Salvato, Mara; Ilbert, Olivier; Hoyle, Ben
- Nature Astronomy, Vol. 3, Issue 3
Clues on the hot star content and the ultraviolet output of elliptical galaxies
journal, November 1990
- Greggio, Laura; Renzini, Alvio
- The Astrophysical Journal, Vol. 364
An end-to-end simulation framework for the Large Synoptic Survey Telescope
conference, August 2014
- Connolly, Andrew J.; Angeli, George Z.; Chandrasekharan, Srinivasan
- SPIE Astronomical Telescopes + Instrumentation, SPIE Proceedings
Impact of photometric redshifts on the galaxy power spectrum and BAO scale in the LSST survey
journal, March 2019
- Ansari, Reza; Choyer, Adeline; Habibi, Farhang
- Astronomy & Astrophysics, Vol. 623
Update on the CASTOR mission concept: scientific opportunities in the Euclid and WFIRST era
conference, July 2014
- Côté, Patrick; Scott, Alan
- SPIE Astronomical Telescopes + Instrumentation, SPIE Proceedings
Weak Lensing for Precision Cosmology
journal, September 2018
- Mandelbaum, Rachel
- Annual Review of Astronomy and Astrophysics, Vol. 56, Issue 1
Cosmology with the Large Synoptic Survey Telescope: an overview
journal, April 2018
- Zhan, Hu; Anthony Tyson, J.
- Reports on Progress in Physics, Vol. 81, Issue 6
Photometric redshifts for the Dark Energy Survey and VISTA and implications for large-scale structure
journal, May 2008
- Banerji, Manda; Abdalla, Filipe B.; Lahav, Ofer
- Monthly Notices of the Royal Astronomical Society, Vol. 386, Issue 3
Photometric redshifts from SDSS images using a convolutional neural network
journal, December 2018
- Pasquet, Johanna; Bertin, E.; Treyer, M.
- Astronomy & Astrophysics, Vol. 621
LSST: From Science Drivers to Reference Design and Anticipated Data Products
journal, March 2019
- Ivezić, Željko; Kahn, Steven M.; Tyson, J. Anthony
- The Astrophysical Journal, Vol. 873, Issue 2