2024A&A...691A.319E

Query : 2024A&A...691A.319E

2024A&A...691A.319E - Astronomy and Astrophysics, volume 691A319 (2024/11-1)

Euclid preparation LIII. LensMC, weak lensing cosmic shear measurement with forward modelling and Markov Chain Monte Carlo sampling.

EUCLID COLLABORATION, CONGEDO G., MILLER L., TAYLOR A.N., CROSS N., DUNCAN C.A.J., KITCHING T., MARTINET N., MATTHEW S., SCHRABBACK T., TEWES M., WELIKALA N., AGHANIM N., AMARA A., ANDREON S., AURICCHIO N., BALDI M., BARDELLI S., BENDER R., BODENDORF C., BONINO D., BRANCHINI E., BRESCIA M., BRINCHMANN J., CAMERA S., CAPOBIANCO V., CARBONE C., CARDONE V.F., CARRETERO J., CASAS S., CASTANDER F.J., CASTELLANO M., CAVUOTI S., CIMATTI A., CONSELICE C.J., CONVERSI L., COPIN Y., COURBIN F., COURTOIS H.M., CROPPER M., DA SILVA A., DEGAUDENZI H., DI GIORGIO A.M., DINIS J., DUBATH F., DUPAC X., FARINA M., FARRENS S., FERRIOL S., FOSALBA P., FRAILIS M., FRANCESCHI E., GALEOTTA S., GARILLI B., GILLIS B., GIOCOLI C., GRAZIAN A., GRUPP F., HAUGAN S.V.H., HOLLIMAN M.S., HOLMES W., HORMUTH F., HORNSTRUP A., HUDELOT P., JAHNKE K., KEIHANEN E., KERMICHE S., KIESSLING A., KILBINGER M., KUBIK B., KUIJKEN K., KUMMEL M., KUNZ M., KURKI-SUONIO H., LIGORI S., LILJE P.B., LINDHOLM V., LLORO I., MAINO D., MAIORANO E., MANSUTTI O., MARGGRAF O., MARKOVIC K., MARULLI F., MASSEY R., MAUROGORDATO S., McCRACKEN H.J., MEDINACELI E., MEI S., MELCHIOR M., MENEGHETTI M., MERLIN E., MEYLAN G., MORESCO M., MORIN B., MOSCARDINI L., MUNARI E., NIEMI S.-M., NIGHTINGALE J.W., PADILLA C., PALTANI S., PASIAN F., PEDERSEN K., PERCIVAL W.J., PETTORINO V., PIRES S., POLENTA G., PONCET M., POPA L.A., POZZETTI L., RAISON F., REBOLO R., RENZI A., RHODES J., RICCIO G., ROMELLI E., RONCARELLI M., ROSSETTI E., SAGLIA R., SAPONE D., SARTORIS B., SCHNEIDER P., SECROUN A., SEIDEL G., SERRANO S., SIRIGNANO C., SIRRI G., STANCO L., TALLADA-CRESPI P., TAVAGNACCO D., TERENO I., TOLEDO-MOREO R., TORRADEFLOT F., TUTUSAUS I., VALENTIJN E.A., VALENZIANO L., VASSALLO T., VEROPALUMBO A., WANG Y., WELLER J., ZAMORANI G., ZOUBIAN J., ZUCCA E., BIVIANO A., BOLZONELLA M., BOUCAUD A., BOZZO E., BURIGANA C., COLODRO-CONDE C., DI FERDINANDO D., GRACIA-CARPIO J., MAURI N., NEISSNER C., NUCITA A.A., SAKR Z., SCOTTEZ V., TENTI M., VIEL M., WIESMANN M., AKRAMI Y., ALLEVATO V., ANSELMI S., BACCIGALUPI C., BALLARDINI M., BORGANI S., BORLAFF A.S., BRUTON S., CABANAC R., CAPPI A., CARVALHO C.S., CASTIGNANI G., CASTRO T., CANAS-HERRERA G., CHAMBERS K.C., COORAY A.R., COUPON J., DAVINI S., DE LUCIA G., DESPREZ G., DI DOMIZIO S., DOLE H., DIAZ-SANCHEZ A., ESCARTIN VIGO J.A., ESCOFFIER S., FERRERO I., FINELLI F., GABARRA L., GARCIA-BELLIDO J., GAZTANAGA E., GIACOMINI F., GOZALIASL G., GUINET D., HALL A., HILDEBRANDT H., ILIC S., JIMENEZ MUNOZ A., JOUDAKI S., KAJAVA J.J.E., KANSAL V., KARAGIANNIS D., KIRKPATRICK C.C., LEGRAND L., MACIAS-PEREZ J., MAGGIO G., MAGLIOCCHETTI M., MAOLI R., MARTINELLI M., MARTINS C.J.A.P., MATURI M., MAURIN L., METCALF R.B., MIGLIACCIO M., MONACO P., MORGANTE G., NADATHUR S., PATRIZII L., PEEL A., PEZZOTTA A., POPA V., PORCIANI C., POTTER D., PONTINEN M., REIMBERG P., ROCCI P.-F., SANCHEZ A.G., SCHEWTSCHENKO J.A., SCHNEIDER A., SEFUSATTI E., SERENO M., SIMON P., SPURIO MANCINI A., STADEL J., STEINWAGNER J., TESTERA G., TEYSSIER R., TOFT S., TOSI S., TROJA A., TUCCI M., VALIERI C., VALIVIITA J. and VERGANI D.

Abstract (from CDS):

LENSMC is a weak lensing shear measurement method developed for Euclid and Stage-IV surveys. It is based on forward modelling in order to deal with convolution by a point spread function (PSF) with comparable size to many galaxies, sampling the posterior distribution of galaxy parameters via Markov chain Monte Carlo, and marginalisation over nuisance parameters for each of the 1.5 billion galaxies observed by Euclid. We quantified the scientific performance through high-fidelity images based on the Euclid Flagship simulations and emulation of the Euclid VIS images, realistic clustering with a mean surface number density of 250 arcmin^–2 (I_E < 29.5) for galaxies, and 6 arcmin^–2 (I_E < 26) for stars, and a diffraction-limited chromatic PSF with a full width at half maximum of 0'.'2 and spatial variation across the field of view. LENSMC measured objects with a density of 90 arcmin^–2 (I_E < 26.5) in 4500 deg². The total shear bias was broken down into measurement (our main focus here) and selection effects (which will be addressed in future work). We found measurement multiplicative and additive biases of m₁ = (-3.6 ± 0.2) × 10^–3, m₂ = (-4.3 ± 0.2) × 10^–3, c₁ = (-1.78 ± 0.03) × 10-⁴, and c₂ = (0.09 ± 0.03) × 10^–4; a large detection bias with a multiplicative component of 1.2 × 10^–2 and an additive component of -3 × 10^–4; and a measurement PSF leakage of α₁ = (-9 ± 3) × 10^–4 and α₂ = (2 ± 3) × 10^–4. When model bias is suppressed, the obtained measurement biases are close to Euclid requirement and largely dominated by undetected faint galaxies (-5 × 10^–3). Although significant, model bias will be straightforward to calibrate given its weak sensitivity on galaxy morphology parameters. LENSMC is publicly available at gitlab.com/gcongedo/LensMC.

Abstract Copyright: © The Authors 2024

Journal keyword(s): gravitational lensing: weak - methods: data analysis - cosmology: observations

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	NAME GOODS Southern Field	reg	03 32 28.0	-27 48 30						~	1623	1

Query : 2024A&A...691A.319E

Basic data :

NAME GOODS Southern Field -- Region defined in the Sky
Other object types:	`reg ()`
ICRS coord. (ep=J2000) :	`03 32 28.0 -27 48 30 [ ] D ~`
FK4 coord. (ep=B1950 eq=1950) :	`03 30 22.4 -27 58 35 [ ]`
Gal coord. (ep=J2000) :	`223.5732 -54.4374 [ ]`

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NAME GOODS South Field NAME GOODS Southern Field NAME GOODS-S Field NAME GOODS-South Field

References (1623 between 1850 and 2026) (Total 1623)
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