Query : 2017A&A...608L...8M

2017A&A...608L...8M - Astronomy and Astrophysics, volume 608, L8-8 (2017/12-1)

Calibration of the photometric G passband for Gaia Data Release 1.


Abstract (from CDS):

Context. On September 2016 the first data from Gaia were released (DR1). The first release included photometry for over 109 sources in the very broad G system.
Aims. The aims here are to test the correspondence between G magnitudes in DR1 and the synthetic equivalents derived using spectral energy distributions from observed and model spectrophotometry; to correct the G passband curve; and to measure the zero point in the Vega system.
Methods. I have computed the synthetic G and Tycho-2 BTVT photometry for a sample of stars using the Next Generation Spectral Library (NGSL) and the Hubble Space Telescope (HST) CALSPEC spectroscopic standards.
Results. I have found that the nominal G passband curve is too blue for the DR1 photometry, as shown by the presence of a color term in the comparison between observed and synthetic magnitudes. A correction to the passband applying a power law in λ with an exponent of 0.783 eliminates the color term. The corrected passband has a Vega zero point of 0.070±0.004mag.

Abstract Copyright: © ESO, 2017

Journal keyword(s): surveys - methods: data analysis - techniques: photometric - techniques: photometric

VizieR on-line data: <Available at CDS (J/A+A/608/L8): table1.dat table2.dat>

Simbad objects: 0

goto Full paper

goto View the references in ADS

Number of rows : 0

To bookmark this query, right click on this link: simbad:objects in 2017A&A...608L...8M and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact