Abstract
The ultra-low dispersion spectroscopy to be applied in the ESA Gaia space observatory and the ground-based objective-prism plate surveys represent a similar type of astrophysical data. Although the dispersion in plate surveys is usually larger than in the Gaia blue and red photometers (BP/RP), the spectral resolutions differ by a factor of 2–3 only, since the resolution in ground-based spectra is seeing-limited. We argue that some of the algorithms developed for digitized objective-prism plates can also be applied for the Gaia spectra. At the same time, the plate results confirm the feasibility of observing strong emission lines with Gaia RP/BP.
Highlights
The ESA Gaia is a primary astrometry ESA mission to be launched in 2013
The motivation for studies comparing these two databases is as follows: (1) A comparison of the simulated Gaia BP/RP images with those obtained from digitized Schmidt spectral plates for 8 selected test fields, and (2) A feasibility study for application for the algorithms developed for the plates for Gaia
We have digitised the full collection of Henize plates and have found and analysed the Northern Mt Wilson-Michigan H-alpha sky survey plates deposited at Carnegie Observatories in Pasadena, CA, USA
Summary
The satellite payload consists of a single integrated instrument, the design of which is characterised by a dual telescope concept with a common structure and a common focal plane. The satellite payload consists of a single integrated instrument, the design of which is characterised by a dual telescope concept with a common structure and a common focal plane1 Both telescopes are based on a three-mirror anastigmat design. The expected limiting magnitude is 20 in photometric mode[2] In this contribution, we discuss the data expected to be provided by the BP/RP photometers, and show that they will represent ultra-low dispersion spectra which can be used in various astrophysical projects. 1http://sci.esa.int/gaia/, 2011 2http://sci.esa.int/gaia/, 2011 3http://sci.esa.int/gaia/, 2011 data with analogous data provided by plate surveys
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