2021A&A...649A...3R


Query : 2021A&A...649A...3R

2021A&A...649A...3R - Astronomy and Astrophysics, volume 649A, 3-3 (2021/5-1)

Gaia Early Data Release 3. Photometric content and validation.

RIELLO M., DE ANGELI F., EVANS D.W., MONTEGRIFFO P., CARRASCO J.M., BUSSO G., PALAVERSA L., BURGESS P.W., DIENER C., DAVIDSON M., ROWELL N., FABRICIUS C., JORDI C., BELLAZZINI M., PANCINO E., HARRISON D.L., CACCIARI C., VAN LEEUWEN F., HAMBLY N.C., HODGKIN S.T., OSBORNE P.J., ALTAVILLA G., BARSTOW M.A., BROWN A.G.A., CASTELLANI M., COWELL S., DE LUISE F., GILMORE G., GIUFFRIDA G., HIDALGO S., HOLLAND G., MARINONI S., PAGANI C., PIERSIMONI A.M., PULONE L., RAGAINI S., RAINER M., RICHARDS P.J., SANNA N., WALTON N.A., WEILER M. and YOLDAS A.

Abstract (from CDS):


Context. Gaia Early Data Release 3 (Gaia EDR3) contains astrometry and photometry results for about 1.8 billion sources based on observations collected by the European Space Agency Gaia satellite during the first 34 months of its operational phase.
Aims. In this paper, we focus on the photometric content, describing the input data, the algorithms, the processing, and the validation of the results. Particular attention is given to the quality of the data and to a number of features that users may need to take into account to make the best use of the Gaia EDR3 catalogue.
Methods. The processing broadly followed the same procedure as for Gaia DR2, but with significant improvements in several aspects of the blue and red photometer (BP and RP) preprocessing and in the photometric calibration process. In particular, the treatment of the BP and RP background has been updated to include a better estimation of the local background, and the detection of crowding effects has been used to exclude affected data from the calibrations. The photometric calibration models have also been updated to account for flux loss over the whole magnitude range. Significant improvements in the modelling and calibration of the Gaia point and line spread functions have also helped to reduce a number of instrumental effects that were still present in DR2.
Results. Gaia EDR3 contains 1.806 billion sources with G-band photometry and 1.540 billion sources with GBP and GRP photometry. The median uncertainty in the G-band photometry, as measured from the standard deviation of the internally calibrated mean photometry for a given source, is 0.2mmag at magnitude G=10-14, 0.8mmag at G≃17, and 2.6 mmag at G≃19. The significant magnitude term found in the Gaia DR2 photometry is no longer visible, and overall there are no trends larger than 1 mmag mag–1. Using one passband over the whole colour and magnitude range leaves no systematics above the 1% level in magnitude in any of the bands, and a larger systematic is present for a very small sample of bright and blue sources. A detailed description of the residual systematic effects is provided. Overall the quality of the calibrated mean photometry in Gaia EDR3 is superior with respect to DR2 for all bands.

Abstract Copyright: © ESO 2021

Journal keyword(s): catalogs - surveys - instrumentation: photometers - techniques: photometric - Galaxy: general

VizieR on-line data: <Available at CDS (J/A+A/649/A3): passband.dat zeropt.dat>

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 2C 44 QSO 00 36 06.4449136608 +18 37 59.099054268   20 20     ~ 114 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10317 1
3 BD+52 913 WD* 05 05 30.6180977592 +52 49 51.919301604 10.25 11.44 11.69 11.93 12.108 DA.8 1040 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16158 1
5 GD 71 WD* 05 52 27.6198591816 +15 53 13.228887444 11.675 12.783 13.032 13.169 13.337 DA1.5 360 0
6 2MASS J05591914-1404488 BD* 05 59 19.1872549354 -14 04 49.206913185           T4.5 140 0
7 GD 153 WD* 12 57 02.3224909560 +22 01 52.634778240 11.883 13.060 13.349 13.488 13.669 DA1.2 335 0
8 NAME Proxima Centauri Er* 14 29 42.9461331854 -62 40 46.164680672 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1144 0
9 BD-11 3759 BY* 14 34 16.8116623459 -12 31 10.414495538 14.041 12.915 11.317 10.093 8.473 M3.5V 173 0
10 VB 8 Er* 16 55 35.2557374336 -08 23 40.753073075   18.7 16.916 14.566 12.24 M7Ve 413 0
11 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13094 0
12 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2601 0

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2022.08.13-01:30:24

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