2022A&A...666A.200V


Query : 2022A&A...666A.200V

2022A&A...666A.200V - Astronomy and Astrophysics, volume 666A, 200 (2022/10-1)

Euclid preparation XXI. Intermediate-redshift contaminants in the search for z > 6 galaxies within the Euclid Deep Survey.

VAN MIERLO S.E., CAPUTI K.I., ASHBY M., ATEK H., BOLZONELLA M., BOWLER R.A.A., BRAMMER G., CONSELICE C.J., CUBY J., DAYAL P., DIAZ-SANCHEZ A., FINKELSTEIN S.L., HOEKSTRA H., HUMPHREY A., ILBERT O., McCRACKEN H.J., MILVANG-JENSEN B., OESCH P.A., PELLO R., RODIGHIERO G., SCHIRMER M., TOFT S., WEAVER J.R., WILKINS S.M., WILLOTT C.J., ZAMORANI G., AMARA A., AURICCHIO N., BALDI M., BENDER R., BODENDORF C., BONINO D., BRANCHINI E., BRESCIA M., BRINCHMANN J., CAMERA S., CAPOBIANCO V., CARBONE C., CARRETERO J., CASTELLANO M., CAVUOTI S., CIMATTI A., CLEDASSOU R., CONGEDO G., CONVERSI L., COPIN Y., CORCIONE L., COURBIN F., DA SILVA A., DEGAUDENZI H., DOUSPIS M., DUBATH F., DUPAC X., DUSINI S., FARRENS S., FERRIOL S., FRAILIS M., FRANCESCHI E., FRANZETTI P., FUMANA M., GALEOTTA S., GARILLI B., GILLARD W., GILLIS B., GIOCOLI C., GRAZIAN A., GRUPP F., HAUGAN S.V.H., HOLMES W., HORMUTH F., HORNSTRUP A., JAHNKE K., KUMMEL M., KIESSLING A., KILBINGER M., KITCHING T., KOHLEY R., KUNZ M., KURKI-SUONIO H., LAUREIJS R., LIGORI S., LILJE P.B., LLORO I., MAIORANO E., MANSUTTI O., MARGGRAF O., MARKOVIC K., MARULLI F., MASSEY R., MAUROGORDATO S., MEDINACELI E., MENEGHETTI M., MERLIN E., MEYLAN G., MORESCO M., MOSCARDINI L., MUNARI E., NIEMI S.M., PADILLA C., PALTANI S., PASIAN F., PEDERSEN K., PETTORINO V., PIRES S., PONCET M., POPA L., POZZETTI L., RAISON F., RENZI A., RHODES J., RICCIO G., ROMELLI E., ROSSETTI E., SAGLIA R., SAPONE D., SARTORIS B., SCHNEIDER P., SECROUN A., SIRIGNANO C., SIRRI G., STANCO L., STARCK J.-L., SURACE C., TALLADA-CRESPI P., TAYLOR A.N., TERENO I., TOLEDO-MOREO R., TORRADEFLOT F., TUTUSAUS I., VALENTIJN E.A., VALENZIANO L., VASSALLO T., WANG Y., ZACCHEI A., ZOUBIAN J., ANDREON S., BARDELLI S., BOUCAUD A., GRACIA-CARPIO J., MAINO D., MAURI N., MEI S., SUREAU F., ZUCCA E., AUSSEL H., BACCIGALUPI C., BALAGUERA-ANTOLINEZ A., BIVIANO A., BLANCHARD A., BORGANI S., BOZZO E., BURIGANA C., CABANAC R., CALURA F., CAPPI A., CARVALHO C.S., CASAS S., CASTIGNANI G., COLODRO-CONDE C., COORAY A.R., COUPON J., COURTOIS H.M., CROCCE M., CUCCIATI O., DAVINI S., DOLE H., ESCARTIN J.A., ESCOFFIER S., FABRICIUS M., FARINA M., GANGA K., GARCIA-BELLIDO J., GEORGE K., GIACOMINI F., GOZALIASL G., GWYN S., HOOK I., HUERTAS-COMPANY M., KANSAL V., KASHLINSKY A., KEIHANEN E., KIRKPATRICK C.C., LINDHOLM V., MAOLI R., MARTINELLI M., MARTINET N., MATURI M., METCALF R.B., MONACO P., MORGANTE G., NUCITA A.A., PATRIZII L., PEEL A., POLLACK J., POPA V., PORCIANI C., POTTER D., REIMBERG P., SANCHEZ A.G., SCOTTEZ V., SEFUSATTI E., STADEL J., TEYSSIER R., VALIVIITA J. and VIEL M.

Abstract (from CDS):


Context. The Euclid mission is expected to discover thousands of z > 6 galaxies in three deep fields, which together will cover a ∼50 deg2 area. However, the limited number of Euclid bands (four) and the low availability of ancillary data could make the identification of z > 6 galaxies challenging.
Aims. In this work we assess the degree of contamination by intermediate-redshift galaxies (z = 1-5.8) expected for z > 6 galaxies within the Euclid Deep Survey.
Methods. This study is based on ∼176 000 real galaxies at z = 1-8 in a ∼0.7 deg2 area selected from the UltraVISTA ultra-deep survey and ∼96 000 mock galaxies with 25.3 ≤ H < 27.0, which altogether cover the range of magnitudes to be probed in the Euclid Deep Survey. We simulate Euclid and ancillary photometry from fiducial 28-band photometry and fit spectral energy distributions to various combinations of these simulated data.
Results. We demonstrate that identifying z > 6 galaxies with Euclid data alone will be very effective, with a z > 6 recovery of 91% (88%) for bright (faint) galaxies. For the UltraVISTA-like bright sample, the percentage of z = 1-5.8 contaminants amongst apparent z > 6 galaxies as observed with Euclid alone is 18%, which is reduced to 4% (13%) by including ultra-deep Rubin (Spitzer) photometry. Conversely, for the faint mock sample, the contamination fraction with Euclid alone is considerably higher at 39%, and minimised to 7% when including ultra-deep Rubin data. For UltraVISTA-like bright galaxies, we find that Euclid (IE - YE) > 2.8 and (YE - JE) < 1.4 colour criteria can separate contaminants from true z > 6 galaxies, although these are applicable to only 54% of the contaminants as many have unconstrained (IE - YE) colours. In the best scenario, these cuts reduce the contamination fraction to 1% whilst preserving 81% of the fiducial z > 6 sample. For the faint mock sample, colour cuts are infeasible; we find instead that a 5σ detection threshold requirement in at least one of the Euclid near-infrared bands reduces the contamination fraction to 25%.

Abstract Copyright: © S. E. van Mierlo et al. 2022

Journal keyword(s): galaxies: high-redshift - galaxies: evolution - galaxies: photometry

Errata: erratum vol. 668, art. C3 (2022)

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 - 2024
#notes
1 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3012 0

Query : 2022A&A...666A.200V

Basic data :
NAME COSMOS Field -- Region defined in the Sky
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

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reg ()
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
10 00 28.60 +02 12 21.0 [ ] D 2007ApJS..172..523M
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
09 57 53.49 +02 26 47.1 [ ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
236.82224 +42.12163 [ ]
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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NAME COSMOS Field

References (3012 between 1850 and 2024) (Total 3012)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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