Stellar reddening map from DESI imaging and spectroscopy
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arXiv
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| Format: | Preprint |
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2024
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| author | Zhou, Rongpu Guy, Julien Koposov, Sergey E. Schlafly, Edward F. Schlegel, David Aguilar, Jessica Ahlen, Steven Bailey, Stephen Bianchi, David Brooks, David Chaussidon, Edmond Claybaugh, Todd Dawson, Kyle de la Macorra, Axel Dey, Arjun Dey, Biprateep Eisenstein, Daniel J. Ferraro, Simone Font-Ribera, Andreu Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Honscheid, Klaus Juneau, Stephanie Kehoe, Robert Kirkby, David Kisner, Theodore Kremin, Anthony Lambert, Andrew Landriau, Martin Guillou, Laurent Le Levi, Michael E. Li, Ting S. Manera, Marc Martini, Paul Meisner, Aaron Miquel, Ramon Moustakas, John Myers, Adam D. Newman, Jeffrey A. Niz, Gustavo Palanque-Delabrouille, Nathalie Percival, Will J. Poppett, Claire Prada, Francisco Raichoor, Anand Ross, Ashley J. Rossi, Graziano Sanchez, Eusebio Saydjari, Andrew K. Schubnell, Michael Sprayberry, David Tarl, Gregory Weaver, Benjamin A. Zarrouk, Pauline Zou, Hu |
| author_facet | Zhou, Rongpu Guy, Julien Koposov, Sergey E. Schlafly, Edward F. Schlegel, David Aguilar, Jessica Ahlen, Steven Bailey, Stephen Bianchi, David Brooks, David Chaussidon, Edmond Claybaugh, Todd Dawson, Kyle de la Macorra, Axel Dey, Arjun Dey, Biprateep Eisenstein, Daniel J. Ferraro, Simone Font-Ribera, Andreu Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Honscheid, Klaus Juneau, Stephanie Kehoe, Robert Kirkby, David Kisner, Theodore Kremin, Anthony Lambert, Andrew Landriau, Martin Guillou, Laurent Le Levi, Michael E. Li, Ting S. Manera, Marc Martini, Paul Meisner, Aaron Miquel, Ramon Moustakas, John Myers, Adam D. Newman, Jeffrey A. Niz, Gustavo Palanque-Delabrouille, Nathalie Percival, Will J. Poppett, Claire Prada, Francisco Raichoor, Anand Ross, Ashley J. Rossi, Graziano Sanchez, Eusebio Saydjari, Andrew K. Schubnell, Michael Sprayberry, David Tarl, Gregory Weaver, Benjamin A. Zarrouk, Pauline Zou, Hu |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_05140 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Stellar reddening map from DESI imaging and spectroscopy Zhou, Rongpu Guy, Julien Koposov, Sergey E. Schlafly, Edward F. Schlegel, David Aguilar, Jessica Ahlen, Steven Bailey, Stephen Bianchi, David Brooks, David Chaussidon, Edmond Claybaugh, Todd Dawson, Kyle de la Macorra, Axel Dey, Arjun Dey, Biprateep Eisenstein, Daniel J. Ferraro, Simone Font-Ribera, Andreu Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Honscheid, Klaus Juneau, Stephanie Kehoe, Robert Kirkby, David Kisner, Theodore Kremin, Anthony Lambert, Andrew Landriau, Martin Guillou, Laurent Le Levi, Michael E. Li, Ting S. Manera, Marc Martini, Paul Meisner, Aaron Miquel, Ramon Moustakas, John Myers, Adam D. Newman, Jeffrey A. Niz, Gustavo Palanque-Delabrouille, Nathalie Percival, Will J. Poppett, Claire Prada, Francisco Raichoor, Anand Ross, Ashley J. Rossi, Graziano Sanchez, Eusebio Saydjari, Andrew K. Schubnell, Michael Sprayberry, David Tarl, Gregory Weaver, Benjamin A. Zarrouk, Pauline Zou, Hu Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics 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. |
| title | Stellar reddening map from DESI imaging and spectroscopy |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2409.05140 |