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1. The Target-selection Pipeline for the Dark Energy Spectroscopic Instrument

Author

Adam D. Myers, John Moustakas, Stephen Bailey, Benjamin A. Weaver, Andrew P. Cooper, Jaime E. Forero-Romero, Bela Abolfathi, David M. Alexander, David Brooks, Edmond Chaussidon, Chia-Hsun Chuang, Kyle Dawson, Arjun Dey, Biprateep Dey, Govinda Dhungana, Peter Doel, Kevin Fanning, Enrique Gaztañaga, Satya Gontcho A Gontcho, Alma X. Gonzalez-Morales, ChangHoon Hahn, Hiram K. Herrera-Alcantar, Klaus Honscheid, Mustapha Ishak, Tanveer Karim, David Kirkby, Theodore Kisner, Sergey E. Koposov, Anthony Kremin, Ting-Wen Lan, Martin Landriau, Dustin Lang, Michael E. Levi, Christophe Magneville, Lucas Napolitano, Paul Martini, Aaron Meisner, Jeffrey A. Newman, Nathalie Palanque-Delabrouille, Will Percival, Claire Poppett, Francisco Prada, Anand Raichoor, Ashley J. Ross, Edward F. Schlafly, David Schlegel, Michael Schubnell, Ting Tan, Gregory Tarle, Michael J. Wilson, Christophe Yèche, Rongpu Zhou, Zhimin Zhou, Hu Zou, Moustakas, J [0000-0002-2733-4559], Bailey, S [0000-0003-4162-6619], Cooper, AP [0000-0001-8274-158X], Forero-Romero, JE [0000-0002-2890-3725], Abolfathi, B [0000-0003-1820-8486], Alexander, DM [0000-0002-5896-6313], Brooks, D [0000-0002-8458-5047], Chaussidon, E [0000-0001-8996-4874], Chuang, CH [0000-0002-3882-078X], Dawson, K [0000-0002-0553-3805], Dey, A [0000-0002-4928-4003], Dey, B [0000-0002-5665-7912], Dhungana, G [0000-0002-5402-1216], Gaztañaga, E [0000-0001-9632-0815], Gonzalez-Morales, AX [0000-0003-4089-6924], Hahn, CH [0000-0003-1197-0902], Herrera-Alcantar, HK [0000-0002-9136-9609], Ishak, M [0000-0002-6024-466X], Karim, T [0000-0002-5652-8870], Kirkby, D [0000-0002-8828-5463], Kisner, T [0000-0003-3510-7134], Koposov, SE [0000-0003-2644-135X], Kremin, A [0000-0001-6356-7424], Lan, TW [0000-0001-8857-7020], Landriau, M [0000-0003-1838-8528], Lang, D [0000-0002-1172-0754], Levi, ME [0000-0003-1887-1018], Napolitano, L [0000-0002-5166-8671], Martini, P [0000-0002-4279-4182], Meisner, A [0000-0002-1125-7384], Newman, JA [0000-0001-8684-2222], Palanque-Delabrouille, N [0000-0003-3188-784X], Percival, W [0000-0002-0644-5727], Prada, F [0000-0001-7145-8674], Raichoor, A [0000-0001-5999-7923], Schlafly, EF [0000-0002-3569-7421], Schlegel, D [0000-0002-5042-5088], Tan, T [0000-0001-8289-1481], Tarle, G [0000-0003-1704-0781], Yèche, C [0000-0001-5146-8533], Zhou, R [0000-0001-5381-4372], Zhou, Z [0000-0002-4135-0977], Zou, H [0000-0002-6684-3997], Apollo - University of Cambridge Repository, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and Ministerio de Ciencia e Innovación (España)

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), astro-ph.GA, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Space and Planetary Science, 5101 Astronomical Sciences, Astrophysics of Galaxies (astro-ph.GA), astro-ph.CO, 7 Affordable and Clean Energy, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Astrophysics - Instrumentation and Methods for Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Instrumentation and Methods for Astrophysics (astro-ph.IM), 51 Physical Sciences, Astrophysics - Cosmology and Nongalactic Astrophysics, astro-ph.IM
Abstract

Full list of authors: Myers, Adam D.; Moustakas, John; Bailey, Stephen; Weaver, Benjamin A.; Cooper, Andrew P.; Forero-Romero, Jaime E.; Abolfathi, Bela; Alexander, David M.; Brooks, David; Chaussidon, Edmond; Chuang, Chia-Hsun; Dawson, Kyle; Dey, Arjun; Dey, Biprateep; Dhungana, Govinda; Doel, Peter; Fanning, Kevin; Gaztanaga, Enrique; Gontcho, Satya Gontcho; Gonzalez-Morales, Alma X.; Hahn, ChangHoon; Herrera-Alcantar, Hiram K.; Honscheid, Klaus; Ishak, Mustapha; Karim, Tanveer; Kirkby, David; Kisner, Theodore; Koposov, Sergey E.; Kremin, Anthony; Lan, Ting-Wen; Landriau, Martin; Lang, Dustin; Levi, Michael E.; Magneville, Christophe; Napolitano, Lucas; Martini, Paul; Meisner, Aaron; Newman, Jeffrey A.; Palanque-Delabrouille, Nathalie; Percival, Will; Poppett, Claire; Prada, Francisco; Raichoor, Anand; Ross, Ashley J.; Schlafly, Edward F.; Schlegel, David; Schubnell, Michael; Tan, Ting; Tarle, Gregory; Wilson, Michael J.; Yeche, Christophe; Zhou, Rongpu; Zhou, Zhimin; Zou, Hu.--This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited., In 2021 May, the Dark Energy Spectroscopic Instrument (DESI) began a 5 yr survey of approximately 50 million total extragalactic and Galactic targets. The primary DESI dark-time targets are emission line galaxies, luminous red galaxies, and quasars. In bright time, DESI will focus on two surveys known as the Bright Galaxy Survey and the Milky Way Survey. DESI also observes a selection of "secondary" targets for bespoke science goals. This paper gives an overview of the publicly available pipeline (desitarget) used to process targets for DESI observations. Highlights include details of the different DESI survey targeting phases, the targeting ID (TARGETID) used to define unique targets, the bitmasks used to indicate a particular type of target, the data model and structure of DESI targeting files, and examples of how to access and use the desitarget code base. This paper will also describe "supporting" DESI target classes, such as standard stars, sky locations, and random catalogs that mimic the angular selection function of DESI targets. The DESI target-selection pipeline is complex and sizable; this paper attempts to summarize the most salient information required to understand and work with DESI targeting data. © 2023. The Author(s). Published by the American Astronomical Society., A.D.M. and J.M. were supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics, under Award Numbers DE-SC0019022 and DE-SC0020086. A.P.C. is supported by a Taiwan Ministry of Education Yushan Fellowship and Taiwan Ministry of Science and Technology grant No. 109-2112-M-007-011-MY3. This research is supported by the Director, Office of Science, Office of High Energy Physics of the U.S. Department of Energy under Contract No. DEAC0205CH11231, and by the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility under the same contract; additional support for DESI is provided by the U.S. National Science Foundation, Division of Astronomical Sciences under Contract No. AST-0950945 to the NSF's National Optical-Infrared Astronomy Research Laboratory; the Science and Technologies Facilities Council of the United Kingdom; the Gordon and Betty Moore Foundation; the Heising-Simons Foundation; the French Alternative Energies and Atomic Energy Commission (CEA); the National Council of Science and Technology of Mexico (CONACYT); the Ministry of Science and Innovation of Spain (MICINN), and by the DESI Member Institutions: https://www.desi.lbl.gov/collaborating-institutions., With funding from the Spanish government through the "Severo Ochoa Centre of Excellence" accreditation (CEX2021-001131-S).

Published
2023
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2. First Cosmology Results using Type Ia Supernovae from the Dark Energy Survey: Constraints on Cosmological Parameters

Author

Abbott, TMC, Allam, S, Andersen, P, Angus, C, Asorey, J, Avelino, A, Avila, S, Bassett, BA, Bechtol, K, Bernstein, GM, Bertin, E, Brooks, D, Brout, D, Brown, P, Burke, DL, Calcino, J, Rosell, AC, Carollo, D, Carrasco Kind, M, Carretero, J, Casas, R, Castander, FJ, Cawthon, R, Challis, P, Childress, M, Clocchiatti, A, Cunha, CE, D'Andrea, CB, Da Costa, LN, Davis, C, Davis, TM, De Vicente, J, Depoy, DL, Desai, S, Diehl, HT, Doel, P, Drlica-Wagner, A, Eifler, TF, Evrard, AE, Fernandez, E, Filippenko, AV, Finley, DA, Flaugher, B, Foley, RJ, Fosalba, P, Frieman, J, Galbany, L, García-Bellido, J, Gaztanaga, E, Giannantonio, T, Glazebrook, K, Goldstein, DA, González-Gaitán, S, Gruen, D, Gruendl, RA, Gschwend, J, Gupta, RR, Gutierrez, G, Hartley, WG, Hinton, Hollowood, DL, Honscheid, K, Hoormann, JK, Hoyle, B, James, DJ, Jeltema, T, Johnson, MWG, Johnson, MD, Kasai, E, Kent, S, Kessler, R, Kim, AG, Kirshner, RP, Kovacs, E, Krause, E, Kron, R, Kuehn, K, Kuhlmann, S, Kuropatkin, N, Lahav, O, Lasker, J, Lewis, GF, Li, TS, Lidman, C, Lima, M, Lin, H, Macaulay, E, Maia, MAG, Mandel, KS, March, M, Marriner, J, Marshall, JL, Martini, P, Menanteau, F, Miller, CJ, Miquel, R, Miranda, V, Mohr, JJ, Morganson, E, Muthukrishna, D, Avelino, A [0000-0002-2938-7822], Brooks, D [0000-0002-8458-5047], Brout, D [0000-0001-5201-8374], Brown, P [0000-0001-6272-5507], Carrasco Kind, M [0000-0002-4802-3194], Castander, FJ [0000-0001-7316-4573], D'Andrea, CB [0000-0002-8198-0332], Drlica-Wagner, A [0000-0001-8251-933X], Filippenko, AV [0000-0003-3460-0103], Galbany, L [0000-0002-1296-6887], Glazebrook, K [0000-0002-3254-9044], Goldstein, DA [0000-0003-3461-8661], Gruendl, RA [0000-0002-4588-6517], Hinton, SR [0000-0003-2071-9349], Hollowood, DL [0000-0002-9369-4157], Kessler, R [0000-0003-3221-0419], Kuehn, K [0000-0003-0120-0808], Lewis, GF [0000-0003-3081-9319], Lidman, C [0000-0003-1731-0497], Mandel, KS [0000-0001-9846-4417], Marshall, JL [0000-0003-0710-9474], Martini, P [0000-0002-4279-4182], Miquel, R [0000-0002-6610-4836], Morganson, E [0000-0001-7180-109X], and Apollo - University of Cambridge Repository

Subjects
Affordable and Clean Energy, astro-ph.CO, Astronomical And Space Sciences, Astronomy & Astrophysics, dark energy, dark matter
Abstract

We present the first cosmological parameter constraints using measurements of type Ia supernovae (SNe Ia) from the Dark Energy Survey Supernova Program (DES-SN). The analysis uses a subsample of 207 spectroscopically confirmed SNe Ia from the first three years of DES-SN, combined with a low-redshift sample of 122 SNe from the literature. Our "DES-SN3YR" result from these 329 SNe Ia is based on a series of companion analyses and improvements covering SN Ia discovery, spectroscopic selection, photometry, calibration, distance bias corrections, and evaluation of systematic uncertainties. For a flat ΛCDM model we find a matter density Ω m = 0.331 ± 0.038. For a flat wCDM model, and combining our SN Ia constraints with those from the cosmic microwave background (CMB), we find a dark energy equation of state w = -0.978 ± 0.059, and ω m = 0.321 ± 0.018. For a flat w 0 w a CDM model, and combining probes from SN Ia, CMB and baryon acoustic oscillations, we find w0 = -0.885 ± 0.114 and w a = -0.387 ± 0.430. These results are in agreement with a cosmological constant and with previous constraints using SNe Ia (Pantheon, JLA).

Published
2019

3. Quasar Accretion Disk Sizes from Continuum Reverberation Mapping from the Dark Energy Survey

Author

Mudd, D, Martini, P, Zu, Y, Kochanek, C, Peterson, BM, Kessler, R, Davis, TM, Hoormann, JK, King, A, Lidman, C, Sommer, NE, Tucker, BE, Asorey, J, Hinton, S, Glazebrook, K, Kuehn, K, Lewis, G, Macaulay, E, Moeller, A, O'Neill, C, Zhang, B, Abbott, TMC, Abdalla, FB, Allam, S, Banerji, M, Benoit-Lévy, A, Bertin, E, Brooks, D, Rosell, AC, Carollo, D, Kind, MC, Carretero, J, Cunha, CE, D'Andrea, CB, Costa, LND, Davis, C, Desai, S, Doel, P, Fosalba, P, García-Bellido, J, Gaztanaga, E, Gerdes, DW, Gruen, D, Gruendl, RA, Gschwend, J, Gutierrez, G, Hartley, WG, Honscheid, K, James, DJ, Kuhlmann, S, Kuropatkin, N, Lima, M, Maia, MAG, Marshall, JL, McMahon, RG, Menanteau, F, Miquel, R, Plazas, AA, Romer, AK, Sanchez, E, Schindler, R, Schubnell, M, Smith, M, Smith, RC, Soares-Santos, M, Sobreira, F, Suchyta, E, Swanson, MEC, Tarle, G, Thomas, D, Tucker, DL, Walker, AR, Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), DES, Mudd, D [0000-0003-2371-4121], Martini, P [0000-0002-4279-4182], Zu, Y [0000-0001-6966-6925], Kochanek, C [0000-0001-6017-2961], Peterson, BM [0000-0001-6481-5397], Kessler, R [0000-0003-3221-0419], Davis, TM [0000-0002-4213-8783], Hoormann, JK [0000-0002-6356-4669], King, A [0000-0001-5352-0550], Lidman, C [0000-0003-1731-0497], Asorey, J [0000-0002-6211-499X], Glazebrook, K [0000-0002-3254-9044], Rosell, AC [0000-0003-3044-5150], Gruendl, RA [0000-0002-4588-6517], Smith, RC [0000-0001-5303-6830], and Apollo - University of Cambridge Repository

Subjects
Astrophysics::High Energy Astrophysical Phenomena, galaxies: active, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Gravitational microlensing, 01 natural sciences, accretion, quasars: general, 0103 physical sciences, 010303 astronomy & astrophysics, STFC, Astrophysics::Galaxy Astrophysics, QB, Physics, accretion, accretion disks, general [quasars], 010308 nuclear & particles physics, accretion disks, RCUK, Astronomy and Astrophysics, Quasar, Light curve, Astrophysics - Astrophysics of Galaxies, Accretion (astrophysics), Wavelength, Thin disk, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), active [galaxies], Dark energy, Reverberation mapping, Astrophysics::Earth and Planetary Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

We present accretion disk size measurements for 15 luminous quasars at $0.7 \leq z \leq 1.9$ derived from $griz$ light curves from the Dark Energy Survey. We measure the disk sizes with continuum reverberation mapping using two methods, both of which are derived from the expectation that accretion disks have a radial temperature gradient and the continuum emission at a given radius is well-described by a single blackbody. In the first method we measure the relative lags between the multiband light curves, which provides the relative time lag between shorter and longer wavelength variations. From this, we are only able to constrain upper limits on disk sizes, as many are consistent with no lag the 2$\sigma$ level. The second method fits the model parameters for the canonical thin disk directly rather than solving for the individual time lags between the light curves. Our measurements demonstrate good agreement with the sizes predicted by this model for accretion rates between 0.3-1 times the Eddington rate. Given our large uncertainties, our measurements are also consistent with disk size measurements from gravitational microlensing studies of strongly lensed quasars, as well as other photometric reverberation mapping results, that find disk sizes that are a factor of a few ($\sim$3) larger than predictions., Comment: Accepted by ApJ, comments still welcome!

Published
2018
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