The Future of the Gaia Universe - Anthony G.A. Brown Leiden Observatory, Leiden University - Zenodo
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The Future of the Gaia Universe
Anthony G.A. Brown
Leiden Observatory, Leiden University
brown@strw.leidenuniv.nl
ESA/Gaia/DPAC
d
ha nge Ga
ia D
c
ea lly qui R2
r s
2 has for u te a hel
bit ped
ia DR e field ...
Ga th
This would not have been
possible without Gaia DR2
Gaia
D
my R2 mak
life Revolution!
easi es
er
Gaia instruments and measurements
ESLAB #53 - 2019.04.12 - 3/12
Gaia EDR3/DR3 schedule
l Gaia EDR3 in third quarter of 2020
l Gaia DR3 second half 2021
l Both releases based on same input data and same source list
I 34 months of input data
(E)DR3 contents on following slides are subject to successful processing and validation.
Source numbers are preliminary estimates!
ESLAB #53 - 2019.04.12 - 4/12
Contents of Gaia EDR3
Data Product No. of sources Comments
Astrometry ∼ 1.8 billion including new quality indicators:
RUWE, source image descriptors
Integrated G, GBP , GRP photometry ∼ 1.8 billion with corresponding passbands
QSO host and galaxy morphological ∼ 3 million based on input list
characterization
Cross-match with external catalogues
Gaia-CRF
DR2-to-DR3 match table
ESLAB #53 - 2019.04.12 - 5/12
New in Gaia EDR3: extended sources
Figure credits: DPAC-CU4/C. Ducourant
l ‘Stacking’ of multiple transits across extended source
I detection of extended components
l Galaxy morphology, bulge/disk ratio, basic disk parameters
l QSO host galaxy morphology, ratio QSO to host intensity, offsets between the two
l Based on input list of ∼ 1.9 million galaxies and ∼ 1.6 million QSOs
l NOTE: Stacked images are not released
ESLAB #53 - 2019.04.12 - 6/12
Contents of Gaia DR3
Data Product No. of sources Comments
Repeat of EDR3 contents
Source Classification and & 300 million based on the BP/RP spectra,
astrophysical parameters magnitude limit TBD
Radial velocities ∼ 30 million GRVS . 14
Mean BP/RP/RVS spectra TBD subset of sources
Photometric variability ∼ 7 million eclipsing, (MS) pulsating,
characterization, classification, transients, spotted, flaring, evolved
light curves pulsators, and quasars
Solar system objects epoch ∼ 100 000 including orbit solutions
astrometry/photometry
Solar system objects mean BP/RP ∼ 5000
reflectance spectra
Catalogue of astrometric, TBD Combined solutions where possible
spectroscopic, eclipsing non-single
stars
ESLAB #53 - 2019.04.12 - 7/12
New items in Gaia DR3
Astrometric non-single star solution types
l acceleration, 7 and 9 parameters
l orbital solutions, 12 parameters
l stochastic solutions
Mean BP/RP/RVS spectra
I single star source model or basic binary star model
does not fit l For subset of sources only
l NOTE: no epoch astrometry or epoch radial l Tool to handle BP/RP spectra will be
velocities will be released as part of Gaia DR3 provided
Astrophysical parameters based on BP/RP/RVS spectra Solar system objects
u Teff , AG , E(GBP − GRP ), log g, metallicity, u Orbits
abundances, distances, radii, masses, activity index u Reflectance spectra
I solutions from multiple algorithms will be provided
I rotational velocity for bright subset of stars (TBC)
u Extinction map
u Source classification (star, binary, galaxy, . . . )
ESLAB #53 - 2019.04.12 - 8/12
Gaia DR4
l Final release for the nominal mission
I 60 months input data; schedule TBD
l Foreseen data products
I Full astrometric, photometric, and radial-velocity
catalogues
I All variable-star and non-single-star solutions
I Source classifications (probabilities) plus multiple
astrophysical parameters (derived from BP/RP, RVS,
and astrometry) for stars, unresolved binaries,
galaxies, and quasars
I Catalogue of binaries and exo-planets
I Image reconstruction results
I All epoch and transit data for all sources, including all
BP/RP/RVS spectra
Overall gain in precision for DR3 and DR4: factors 1.2
and 1.7 with respect to DR2
u proper motions improve by factors 1.9 and 4.5 Image credits: ESA/Gaia/DPAC, Mowlavi et al.
ESLAB #53 - 2019.04.12 - 9/12
Gaia extension
l Nominal Gaia mission ends mid-2019 after 5 years of measurements
l Hardware in good shape, only limiting factor is micro-propulsion fuel
I mission can continue to end-2024 (±0.5 yr)
l Proposal submitted to ESA for 5 year extension
I approved to end 2020, preliminary approval to end 2022, submit proposal for 2023–2024 in 2020
10 year mission
u Parallaxes, photometry, radial
velocities improve by factor 1.4 with
respect to DR4
u Proper motions improve by factor of
2.8 with respect to DR4
I Improvement of more complex
motions (e.g., planets) up to factors
Accuracy of Gaia reference frame
of 20 vs. time (F. Mignard)
u Accurate tangential motions over
22.6× larger volume
ESLAB #53 - 2019.04.12 - 10/12Gaia extension
l Larger volume reached throughout
the halo at given proper motion
accuracy
l Uncover more streams
l Probe young and unmixed debris
located beyond 20–30 kpc
l Calibration of spectrophotometric
distance indicators on nearby
samples ⇒ full gain in tangential
motion performance
ESLAB #53 - 2019.04.12 - 11/12Your papers are the best argument for an extended Gaia mission
Gaia
l Please acknowledge the work by DPAC and ESA in your papers!
I helps us argue the case for continued funding of the data processing
I https://gea.esac.esa.int/archive/documentation/credits.html
l Communicate your Gaia results
I https://www.cosmos.esa.int/web/gaia/communicating-your-results
ESLAB #53 - 2019.04.12 - 12/12You can also read
