J/A+A/617/A138 Revised Gaia Data Release 2 passbands (Weiler, 2018)
Revised Gaia Data Release 2 passbands.
Weiler M.
<Astron. Astrophys. 617, A138 (2018)>
=2018A&A...617A.138W 2018A&A...617A.138W (SIMBAD/NED BibCode)
ADC_Keywords: Photometry, sensitivity functions
Keywords: catalogs - techniques: photometric - instrumentation: photometers -
techniques: spectroscopic
Abstract:
The European Space Agency mission Gaia has published with its second
data release (DR2, Cat. I/345) a catalogue of photometric measurements
for more than 1.3 billion astronomical objects in three passbands. The
precision of the measurements in these passbands, denoted G, GBP,
and GRP, reaches down to the milli-magnitude level. The scientific
exploitation of this data set requires precise knowledge on the
response curves of the three passbands. This work aims for improving
the exploitation of the photometric data by deriving an improved set
of response curves for the three passbands, allowing for an accurate
computation of synthetic Gaia photometry. This is achieved by
formulating the problem of passband determination in a functional
analytic formalism, and linking the photometric measurements with four
observational, one empirical and one theoretical spectral library. We
present response curves for G, GBP, and GRP that differ from the
previously published curves, and which provide a better agreement
between synthetic Gaia photometry and Gaia observations.
Description:
The passbands for G, BP (bright regime), BP (faint regime), and RP are
presented as a function of wavelength. Each passband is separated into
the parallel and orthogonal component with respect to the set of
calibration sources. The passband is the sum of its parallel and
orthogonal component.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 111 3093 G, BP (bright), BP (faint), and RP passbands,
separated into the parallel and orthogonal
components
--------------------------------------------------------------------------------
See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/A+A/619/A180 : Gaia DR2 photometric sensitivity curves (Maiz Apellaniz+ 2018)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.2 nm lambda Wavelength in nm
9- 20 F12.9 --- Gpar Parallel component of G passband
22- 33 F12.9 --- Gort Orthogonal component of G passband
35- 46 F12.9 --- GBPbpar Parallel component of GBP (bright) passband
48- 59 F12.9 --- GBPbort Orthogonal component of GBP (bright) passband
61- 72 F12.9 --- GBPfpar Parallel component of GBP (faint) passband
74- 85 F12.9 --- GBPfort Orthogonal component of GBP (faint) passband
87- 98 F12.9 --- GRPpar Parallel component of GRP passband
100-111 F12.9 --- GRPort Orthogonal component of GRP passband
--------------------------------------------------------------------------------
Acknowledgements:
Michael Weiler, mweiler(at)fqa.ub.edu
(End) M. Weiler [Universitat de Barcelona, Spain], P. Vannier [CDS] 25-Jun-2018