| Full text | |
| Author(s): Show less - |
Hernan-Caballero, A.
[1]
;
Varela, J.
[2]
;
Lopez-Sanjuan, C.
[2]
;
Muniesa, D.
[1]
;
Civera, T.
[1]
;
Chaves-Montero, J.
[3]
;
Diaz-Garcia, L. A.
[4]
;
Laur, J.
[5]
;
Hernandez-Monteagudo, C.
[6, 7]
;
Abramo, R.
[8]
;
Angulo, R.
[3]
;
Cristobal-Hornillos, D.
[1]
;
Delgado, R. M. Gonzalez
[4]
;
Greisel, N.
[1]
;
Orsi, A.
[1]
;
Queiroz, C.
[8, 9]
;
Sobral, D.
[10]
;
Tamm, A.
[5]
;
Tempel, E.
[5]
;
Vazquez-Ramio, H.
[2]
;
Alcaniz, J.
[11]
;
Benitez, N.
[4]
;
Bonoli, S.
[12, 1, 3]
;
Carneiro, S.
[13]
;
Cenarro, J.
[2]
;
Dupke, R.
[14, 15, 11]
;
Ederoclite, A.
[16]
;
Marin-Franch, A.
[2]
;
de Oliveira, C. Mendes
[16]
;
Moles, M.
[1, 4]
;
Sodre Jr, L.
;
Taylor, K.
[17]
;
Cypriano, E. S.
[18]
;
Martinez-Solaeche, G.
[4]
Total Authors: 34
|
| Affiliation: Show less - | [1] Ctr Estudios Fis Cosmos Aragon CEFCA, Plaza San Juan 1, Teruel 44001 - Spain
[2] CSIC, Unidad Asociada, Ctr Estudios Fis Cosmos Aragon CEFCA, Plaza San Juan 1, Teruel 44001 - Spain
[3] Donostia Int Phys Ctr, Paseo Manuel de Lardizabal 4, Donostia San Sebastian 20018 - Spain
[4] Inst Astrofis Andalucia CSIC, POB 3004, Granada 18080 - Spain
[5] Univ Tartu, Tartu Observ, Observatooriumi 1, EE-61602 Toravere - Estonia
[6] Inst Astrofis Canarias, Tenerife 38200 - Spain
[7] Univ La Laguna, Dept Astrofis, Tenerife 38206 - Spain
[8] Univ Sao Paulo, Inst Fis, Rua Matao 1371, BR-05508090 Sao Paulo - Brazil
[9] Univ Fed Rio Grande do Sul UFRGS, Inst Fis, Dept Astron, Av Bento Goncalves 9500, Porto Alegre, RS - Brazil
[10] Univ Lancaster, Dept Phys, Lancaster LA1 4YB - England
[11] Minist Ciencia Tecnol Inovacao & Comunicacoes, Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro - Brazil
[12] Basque Fdn Sci, Ikerbasque, Bilbao 48013 - Spain
[13] Univ Fed Bahia, Inst Fis, BR-40210340 Salvador, BA - Brazil
[14] Univ Alabama, Dept Phys & Astron, Box 870324, Tuscaloosa, AL 35487 - USA
[15] Univ Michigan, Dept Astron, 311 West Hall, 1085 South Univ Ave, Ann Arbor, MI 48109 - USA
[16] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Dept Astron, Cidade Univ, BR-05508900 Sao Paulo, SP - Brazil
[17] Instruments4, Tampa, FL - USA
[18] Sodre Jr, Jr., L., Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Dept Astron, Cidade Univ, BR-05508900 Sao Paulo, SP - Brazil
Total Affiliations: 18
|
| Document type: | Journal article |
| Source: | Astronomy & Astrophysics; v. 654, OCT 19 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
MiniJPAS is a similar to 1 deg(2) imaging survey of the AEGIS field in 60 bands, performed to demonstrate the scientific potential of the upcoming Javalambre-Physics of the Accelerating Universe Astrophysical Survey (J-PAS). Full coverage of the 3800-9100 angstrom range with 54 narrow-band filters, in combination with 6 optical broad-band filters, allows for extremely accurate photometric redshifts (photo-z), which, applied over areas of thousands of square degrees, will enable new applications of the photo-z technique, such as measurement of baryonic acoustic oscillations. In this paper we describe the method we used to obtain the photo-z that is included in the publicly available miniJPAS catalogue, and characterise the photo-z performance. We built photo-spectra with 100 angstrom resolution based on forced-aperture photometry corrected for point spread function. Systematic offsets in the photometry were corrected by applying magnitude shifts obtained through iterative fitting with stellar population synthesis models. We computed photo-z with a customised version of LEPHARE, using a set of templates that is optimised for the J-PAS filter-set. We analysed the accuracy of miniJPAS photo-z and their dependence on multiple quantities using a subsample of 5266 galaxies with spectroscopic redshifts from SDSS and DEEP, which we find to be representative of the whole r < 23 miniJPAS sample. Formal 1 sigma uncertainties for the photo-z that are calculated with the Delta chi(2) method underestimate the actual redshift errors. The odds parameter has a stronger correlation with |Delta z| and accurately reproduces the probability of a redshift outlier (|Delta z| > 0.03), regardless of the magnitude, redshift, or spectral type of the sources. We show that the two main summary statistics characterising the photo-z accuracy for a population of galaxies (sigma(NMAD) and eta) can be predicted by the distribution of odds in this population, and we use this to estimate the statistics for the whole miniJPAS sample. At r < 23, there are similar to 17 500 galaxies per deg(2) with valid photo-z estimates, similar to 4200 of which are expected to have |Delta z| < 0.003. The typical error is sigma(NMAD) = 0.013 with an outlier rate eta = 0.39. The target photo-z accuracy sigma(NMAD) = 0.003 is achieved for odds > 0.82 with eta = 0.05, at the cost of decreasing the density of selected galaxies to n similar to 5200 deg(-2) (similar to 2600 of which have |Delta z| < 0.003). (AU) | |
| FAPESP's process: | 19/19687-2 - Galaxy clusters on the J-PAS survey |
| Grantee: | Eduardo Serra Cypriano |
| Support Opportunities: | Regular Research Grants |