open access publication

Article, 2024

Euclid preparation: XXXI. The effect of the variations in photometric passbands on photometric-redshift accuracy

Astronomy and Astrophysics, ISSN 0004-6361, Volume 681, 10.1051/0004-6361/202346993

Contributors

Paltani S. 0000-0002-8108-9179 [1] Coupon J. [1] Hartley W.G. [1] Alvarez Ayllon A. 0000-0002-1353-7929 [1] Dubath F. 0000-0002-6533-2810 [1] Mohr J.J. 0000-0002-6875-2087 [2] [3] Schirmer M. 0000-0003-2568-9994 [4] Cuillandre J.-C. 0000-0002-3263-8645 [5] Desprez G. 0000-0001-8325-1742 [1] [6] Ilbert O. 0000-0002-7303-4397 [7] Kuijken K. 0000-0002-3827-0175 [8] Aghanim N. [9] Altieri B. 0000-0003-3936-0284 [10] Amara A. 0000-0003-3481-3491 [11] Auricchio N. 0000-0003-4444-8651 [12] Baldi M. 0000-0003-4145-1943 [12] [13] [14] Bender R. 0000-0001-7179-0626 [2] [3] Bodendorf C. [2] Bonino D. [15] Branchini E. 0000-0002-0808-6908 [16] [17] Brescia M. 0000-0001-9506-5680 [18] [19] Brinchmann J. 0000-0003-4359-8797 [20] Camera S. 0000-0003-3399-3574 [15] [21] [22] Capobianco V. 0000-0002-3309-7692 [15] Carbone C. 0000-0003-0125-3563 [23] Cardone V.F. [17] [24] Carretero J. 0000-0002-3130-0204 [25] [26] Castander F.J. 0000-0001-7316-4573 [27] [28] Castellano M. 0000-0001-9875-8263 [24] Cavuoti S. 0000-0002-3787-4196 [19] [29] Cledassou R. 0000-0002-8313-2230 [30] [31] Congedo G. 0000-0003-2508-0046 [32] Conselice C.J. 0000-0003-1949-7638 [33] Conversi L. 0000-0002-6710-8476 [10] [34] Copin Y. 0000-0002-5317-7518 [35] Corcione L. 0000-0002-6497-5881 [15] Courbin F. 0000-0003-0758-6510 [36] Cropper M. 0000-0003-4571-9468 [37] Da Silva A. 0000-0002-6385-1609 [38] Degaudenzi H. 0000-0002-5887-6799 [1] Dinis J. [38] Douspis M. [9] Dupac X. [10] Dusini S. 0000-0002-1128-0664 [39] Farrens S. 0000-0002-9594-9387 [5] Ferriol S. [35] Fosalba P. 0000-0002-1510-5214 [27] [28] Frailis M. 0000-0002-7400-2135 [40] Franceschi E. 0000-0002-0585-6591 [12] Franzetti P. 0000-0002-6986-0127 [23] Galeotta S. 0000-0002-3748-5115 [40] Garilli B. 0000-0001-7455-8750 [23] Gillard W. 0000-0003-4744-9748 [41] Gillis B. 0000-0002-4478-1270 [32] Giocoli C. 0000-0002-9590-7961 [12] [13] Grazian A. 0000-0002-5688-0663 [42] Haugan S.V.H. 0000-0001-9648-7260 [43] Hoekstra H. 0000-0002-0641-3231 [8] Hornstrup A. 0000-0002-3363-0936 [44] [45] Hudelot P. [46] Jahnke K. 0000-0003-3804-2137 [4] Kummel M. 0000-0003-2791-2117 [3] Kermiche S. 0000-0002-0302-5735 [41] Kiessling A. 0000-0002-2590-1273 [47] Kilbinger M. 0000-0001-9513-7138 [5] Kitching T. 0000-0002-4061-4598 [37] Kohley R. [10] Kubik B. [35] Kunz M. 0000-0002-3052-7394 [48] Kurki-Suonio H. 0000-0002-4618-3063 [49] Ligori S. 0000-0003-4172-4606 [15] Lilje P.B. 0000-0003-4324-7794 [43] Lloro I. [50] Maiorano E. 0000-0003-2593-4355 [12] Mansutti O. 0000-0001-5758-4658 [40] Marggraf O. 0000-0001-7242-3852 [51] Markovic K. 0000-0001-6764-073X [47] Marulli F. 0000-0002-8850-0303 [12] [13] [14] Massey R. 0000-0002-6085-3780 [52] Masters D. 0000-0001-5382-6138 [53] Maurogordato S. [54] McCracken H.J. 0000-0002-9489-7765 [46] Medinaceli E. 0000-0002-4040-7783 [12] Mei S. 0000-0002-2849-559X [55] Melchior M. [56] Meneghetti M. 0000-0003-1225-7084 [12] [13] Merlin E. 0000-0001-6870-8900 [24] Meylan G. [36] Moresco M. 0000-0002-7616-7136 [12] [14] Moscardini L. 0000-0002-3473-6716 [12] [13] [14] Munari E. 0000-0002-1751-5946 [40] Niemi S.M. [57] Nightingale J. 0000-0002-8987-7401 [52] Padilla C. 0000-0001-7951-0166 [26] Pasian F. [40] Pedersen K. 0000-0002-7876-0435 [58] Percival W.J. 0000-0002-0644-5727 [59] [60] Pettorino V. [5] Polenta G. 0000-0003-4067-9196 [61] Poncet M. [31] Popa L. [62] Raison F. 0000-0002-7819-6918 [2] Rebolo R. [63] [64] Renzi A. 0000-0001-9856-1970 [39] [65] Rhodes J. 0000-0002-4485-8549 [47] Riccio G. [19] Romelli E. 0000-0003-3069-9222 [40] Roncarelli M. 0000-0003-0378-7032 [12] Rossetti E. [14] Saglia R. 0000-0003-0378-7032 [2] [3] Sapone D. 0000-0001-7089-4503 [66] Sartoris B. [3] [40] Schneider P. 0000-0002-5094-2245 [51] Secroun A. 0000-0003-0505-3710 [41] Sirignano C. 0000-0002-0995-7146 [39] [65] Sirri G. 0000-0003-2626-2853 [13] Skottfelt J. 0000-0003-1310-8283 [67] Stanco L. 0000-0002-9706-5104 [39] Starck J.-L. 0000-0003-2177-7794 [5] Surace C. 0000-0003-2592-0113 [7] Tallada-Crespi P. 0000-0002-1336-8328 [25] [68] Tereno I. [38] Toledo-Moreo R. 0000-0002-2997-4859 [69] Torradeflot F. 0000-0003-1160-1517 [25] [68] Tutusaus I. 0000-0002-3199-0399 [48] [70] Valentijn E.A. [71] Valenziano L. 0000-0002-1170-0104 [12] [13] Vassallo T. 0000-0001-6512-6358 [40] Wang Y. 0000-0002-4749-2984 [53] Zamorani G. 0000-0002-2318-301X [12] Zoubian J. [41] Andreon S. 0000-0002-2041-8784 [72] Aussel H. 0000-0002-1371-5705 [5] Bardelli S. 0000-0002-8900-0298 [12] Bolzonella M. 0000-0003-3278-4607 [12] Boucaud A. 0000-0001-7387-2633 [55] Di Ferdinando D. 0000-0003-4644-1752 [13] Farina M. [15] Gracia-Carpio J. 0000-0003-4689-3134 [2] Lindholm V. 0000-0003-2317-5471 [49] Maino D. [23] [73] [74] Mauri N. 0000-0001-8196-1548 [13] [14] Neissner C. 0000-0001-8524-4968 [26] Scottez V. [46] Zucca E. 0000-0002-5845-8132 [12] Baccigalupi C. 0000-0002-8211-1630 [40] [75] [76] [77] Ballardini M. 0000-0003-4481-3559 [12] [78] [79] Biviano A. 0000-0002-0857-0732 [40] [75] Blanchard A. 0000-0001-8555-9003 [70] Borgani S. 0000-0001-6151-6439 [40] [75] [76] Borlaff A.S. 0000-0003-3249-4431 [80] Burigana C. 0000-0002-3005-5796 [12] [13] [79] Cabanac R. 0000-0001-6679-2600 [70] Cappi A. [12] [54] Carvalho C.S. [38] Casas S. 0000-0002-4751-5138 [81] Castignani G. 0000-0001-6831-0687 [12] [14] Chambers K.C. 0000-0001-6965-7789 [82] Cooray A. 0000-0002-3892-0190 [83] Courtois H.M. 0000-0003-0509-1776 [35] Cucciati O. 0000-0002-9336-7551 [12] Davini S. [84] De Lucia G. 0000-0002-6220-9104 [40] Dole H. 0000-0002-9767-3839 [9] Escartin J.A. [2] Escoffier S. 0000-0002-2847-7498 [41] Finelli F. 0000-0002-6694-3269 [12] [13] Fotopoulou S. 0000-0002-9686-254X [85] Ganga K. 0000-0001-8159-8208 [55] George K. 0000-0002-1734-8455 [3] Gozaliasl G. 0000-0002-0236-919X [49] Hildebrandt H. 0000-0002-9814-3338 [86] Hook I. 0000-0002-2960-978X [87] Jimenez Munoz A. 0009-0004-5252-185X [88] Joachimi B. 0000-0001-7494-1303 [89] Kansal V. 0000-0002-4008-6078 [5] Keihanen E. 0000-0003-1804-7715 [49] Kirkpatrick C.C. 0000-0001-5482-7386 [49] Loureiro A. 0000-0002-4371-0876 [32] [89] [90] Macias-Perez J.F. 0000-0002-5385-2763 [88] Maggio G. [40] Magliocchetti M. 0000-0001-9158-4838 [15] Maoli R. 0000-0002-6065-3025 [24] [91] Marcin S. [56] Martinelli M. 0000-0002-6943-7732 [24] Martinet N. 0000-0003-2786-7790 [7] Matthew S. [32] Maurin L. 0000-0002-8406-0857 [9] Metcalf R.B. 0000-0003-3167-2574 [12] [14] Monaco P. 0000-0003-2083-7564 [40] [75] [76] Morgante G. 0000-0001-9234-7412 [12] Nadathur S. 0000-0001-9070-3102 [11] Nucita A.A. 0000-0002-7926-3481 [92] [93] Patrizii L. 0000-0002-9712-977X [13] Pollack J. [55] Popa V. [62] Porciani C. 0000-0002-7797-2508 [51] Potter D. 0000-0002-0757-5195 [94] Pourtsidou A. 0000-0001-9110-5550 [32] [95] Pozzetti L. 0000-0001-7085-0412 [12] Pontinen M. 0000-0001-5442-2530 [49] Reimberg P. 0000-0003-3410-0280 [46] Sanchez A.G. 0000-0003-1198-831X [2] Sakr Z. 0000-0002-4823-3757 [70] [96] [97] Sefusatti E. 0000-0003-0473-1567 [40] [75] [76] Sereno M. 0000-0003-0302-0325 [12] [13] Spurio Mancini A. 0000-0001-5698-0990 [37] Stadel J. 0000-0001-7565-8622 [94] Steinwagner J. [2] Teyssier R. 0000-0001-7689-0933 [98] Valieri C. [13] Valiviita J. 0000-0001-6225-3693 [49] Van Mierlo S.E. 0000-0001-8289-2863 [71] Veropalumbo A. 0000-0003-2387-1194 [74] Viel M. 0000-0002-2642-5707 [40] [75] [76] [77] Weaver J.R. 0000-0003-1614-196X [99]

Affiliations

  1. [1] Observatoire de Genève
    2. [NORA names: Switzerland; Europe, Non-EU; OECD];
  2. [2] Max-Planck-Institut für Extraterrestrische Physik
    3. [NORA names: Germany; Europe, EU; OECD];
  3. [3] Ludwig-Maximilians-Universität München
    4. [NORA names: Germany; Europe, EU; OECD];
  4. [4] Max-Planck-Institut für Astronomie
    5. [NORA names: Germany; Europe, EU; OECD];
  5. [5] Université Paris-Saclay
    6. [NORA names: France; Europe, EU; OECD];

Abstract

The technique of photometric redshifts has become essential for the exploitation of multi-band extragalactic surveys. While the requirements on photometric redshifts for the study of galaxy evolution mostly pertain to the precision and to the fraction of outliers, the most stringent requirement in their use in cosmology is on the accuracy, with a level of bias at the sub-percent level for the Euclid cosmology mission. A separate, and challenging, calibration process is needed to control the bias at this level of accuracy. The bias in photometric redshifts has several distinct origins that may not always be easily overcome. We identify here one source of bias linked to the spatial or time variability of the passbands used to determine the photometric colours of galaxies. We first quantified the effect as observed on several well-known photometric cameras, and found in particular that, due to the properties of optical filters, the redshifts of off-axis sources are usually overestimated. We show using simple simulations that the detailed and complex changes in the shape can be mostly ignored and that it is suficient to know the mean wavelength of the passbands of each photometric observation to correct almost exactly for this bias; the key point is that this mean wavelength is independent of the spectral energy distribution of the source. We use this property to propose a correction that can be computationally eficiently implemented in some photometric-redshift algorithms, in particular template-fitting. We verified that our algorithm, implemented in the new photometric-redshift code Phosphoros, can effectively reduce the bias in photometric redshifts on real data using the CFHTLS T007 survey, with an average measured bias Δz over the redshift range 0:4 ≤ z ≤ 0:7 decreasing by about 0.02, specifically from Δz ≈ 0:04 to Δz ≈ 0:02 around z = 0:5. Our algorithm is also able to produce corrected photometry for other applications.

Keywords

Cosmology: observations, Galaxies: distances and redshifts, Surveys, Techniques: miscellaneous, Techniques: photometric

Funders

  • Nederlandse Onderzoekschool Voor Astronomie
  • National Aeronautics and Space Administration
  • Centre National d’Etudes Spatiales
  • Staatssekretariat für Bildung, Forschung und Innovation
  • Canadian Euclid Consortium
  • Centre National de la Recherche Scientifique
  • National Research Council
  • Swiss Space Office
  • Suomen Akatemia
  • University of Hawai'i
  • Irish Rugby Football Union
  • Norsk Romsenter
  • European Space Agency
  • Commissariat à l'Énergie Atomique et aux Énergies Alternatives
  • Agenția Spațială Română
  • United Kingdom Space Agency
  • Deutsches Zentrum für Luft- und Raumfahrt
  • CFHT
  • Federaal Wetenschapsbeleid
  • Agenzia Spaziale Italiana
  • Institut national des sciences de l'Univers
  • Ministerio de Ciencia e Innovación
  • Asher Space Research Institute, Technion-Israel Institute of Technology
  • Fundação para a Ciência e a Tecnologia

Data Provider: Elsevier

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