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Euclid preparation. XXXVII. Galaxy colour selections with Euclid and ground photometry for cluster weak-lensing analyses

Euclid Collaboration G. F. Lesci M. Sereno M. Radovich G. Castignani L. Bisigello +495 lainnya
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We derived galaxy colour selections from Euclid and ground-based photometry, aiming to accurately define background galaxy samples in cluster weak-lensing analyses. These selections have been implemented in the Euclid data analysis pipelines for galaxy clusters. Given any set of photometric bands, we developed a method for the calibration of optimal galaxy colour selections that maximises the selection completeness, given a threshold on purity. Such colour selections are expressed as a function of the lens redshift. We calibrated galaxy selections using simulated ground-based $griz$ and Euclid $Y_ E J_ E H_ E $ photometry. Both selections produce a purity higher than $97$. The $griz$ selection completeness ranges from 30 to $84$ in the lens redshift range $z_ l $. With the full $grizY_ E J_ E H_ E $ selection, the completeness improves by up to $25$ percentage points, and the $z_ l $ range extends up to $z_ l =1.5$. The calibrated colour selections are stable to changes in the sample limiting magnitudes and redshift, and the selection based on $griz$ bands provides excellent results on real external datasets. Furthermore, the calibrated selections provide stable results using alternative photometric aperture definitions obtained from different ground-based telescopes. The $griz$ selection is also purer at high redshift and more complete at low redshift compared to colour selections found in the literature. We find excellent agreement in terms of purity and completeness between the analysis of an independent, simulated Euclid galaxy catalogue and our calibration sample, except for galaxies at high redshifts, for which we obtain up to 50 percent points higher completeness. The combination of colour and photo-$z$ selections applied to simulated Euclid data yields up to 95 completeness, while the purity decreases down to 92 at high $z_ l $. We show that the calibrated colour selections provide robust results even when observations from a single band are missing from the ground-based data. Finally, we show that colour selections do not disrupt the shear calibration for stage III surveys. The first Euclid data releases will provide further insights into the impact of background selections on the shear calibration.

Topik & Kata Kunci

Physics

Penulis (500)

E

Euclid Collaboration G. F. Lesci

M

M. Sereno

M

M. Radovich

G

G. Castignani

L

L. Bisigello

F

F. Marulli

L

L. Moscardini

L

L. Baumont

G

G. Covone

S

S. Farrens

C

C. Giocoli

L

L. Ingoglia

S

S. Hera

M

M. Vannier

A

A. Biviano

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S. Maurogordato

N

N. Aghanim

A

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N. Auricchio

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S. Bardelli

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C

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E. Branchini

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J. Brinchmann

S

S. Camera

V

V. Capobianco

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C. Carbone

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Universit'e Cote d'Azur

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Observatoire Cote d'Azur

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U. Portsmouth

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10125 Torino

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I. Torino

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Institut de F'isica d'Altes Energies

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T. Z. F. O. Science

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Campus Uab

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08193 Bellaterra

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Rwth Aachen University

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28692 Villanueva de la Canada

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4. R. E. Fermi

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Departament de F'isica

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F. Ciencias

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Universidade Tecnica de Lisboa

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C8 Edif'icio

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C. Grande

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P. Lisboa

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1049-001 Lisboa

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D. O. Astronomy

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U. Geneva

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Format Sitasi

APA MLA BibTeX
Lesci, E.C.G.F., Sereno, M., Radovich, M., Castignani, G., Bisigello, L., Marulli, F. et al. (2023). Euclid preparation. XXXVII. Galaxy colour selections with Euclid and ground photometry for cluster weak-lensing analyses. https://doi.org/10.1051/0004-6361/202348743

Akses Cepat

Lihat di Sumber doi.org/10.1051/0004-6361/202348743
Informasi Jurnal
Tahun Terbit
2023
Bahasa
en
Total Sitasi
1×
Sumber Database
Semantic Scholar
DOI
10.1051/0004-6361/202348743
Akses
Open Access ✓