ELSA – training the next generation of space astrometrists

Lindegren, L.; Bijaoui, A.; Drimmel, R.; Eyer, L.; Jordan, Sandor; Kontizas, M.; Leeuwen, F. van; Muinonen, K.; Pourbaix, D.; Torra, J.; Turon, C.; Vries, J. de; Zwitter, T.

doi:10.1017/s1743921308020061

Cited by 2 publications

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“…We are crossing the gates into a new era in astronomy research, the era of multi-messenger observations, big data and extremely detailed numerical simulations. In this promising scenario, the field of galactic archaeology is in an extraordinary position thanks to the arrival of the satellite Gaia (see Perryman et al 2001;Lindegren et al 2008). A first glimpse at the extraordinary quality of the full 6-dimensional E-mail: npmaffione@unrn.edu.ar (NPM) phase space catalog that Gaia will provide throughout its lifetime has already been publicly released (Michalik et al 2015;Lindegren et al 2016).…”

Section: Introductionmentioning

confidence: 99%

On the relevance of chaos for halo stars in the solar neighbourhood II

Maffione

Gómez

Cincotta

et al. 2018

Monthly Notices of the Royal Astronomical Society

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In a previous paper based on dark matter only simulations we show that, in the approximation of an analytic and static potential describing the strongly triaxial and cuspy shape of Milky Way-sized haloes, diffusion due to chaotic mixing in the neighbourhood of the Sun does not efficiently erase phase space signatures of past accretion events. In this second paper we further explore the effect of chaotic mixing using multicomponent Galactic potential models and solar neighbourhood-like volumes extracted from fully cosmological hydrodynamic simulations, thus naturally accounting for the gravitational potential associated with baryonic components, such as the bulge and disc. Despite the strong change in the global Galactic potentials with respect to those obtained in dark matter only simulations, our results confirm that a large fraction of halo particles evolving on chaotic orbits exhibit their chaotic behaviour after periods of time significantly larger than a Hubble time. In addition, significant diffusion in phase space is not observed on those particles that do exhibit chaotic behaviour within a Hubble time.

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Section: Introductionmentioning

confidence: 99%

On the relevance of chaos for halo stars in the solar neighbourhood II

Maffione

Gómez

Cincotta

et al. 2018

Monthly Notices of the Royal Astronomical Society

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“…Further, at the end of 2013, the astronomical community celebrated the European Space Agency's launch of the Gaia astrometric space mission. Gaia will deliver unparalleled high-precision posi-Email: greg@astro.lu.se tions and transverse velocities for a billion stars in the Milky Way (Perryman et al 2001;Lindegren et al 2008;Lindegren 2010). The imaging surveys and Gaia have led to the design and execution of ground-based, large-scale spectroscopic surveys (e.g.…”

Section: Introductionmentioning

confidence: 99%

A new algorithm for optimizing the wavelength coverage for spectroscopic studies: Spectral Wavelength Optimization Code (swoc)

Ruchti

Feltzing

Lind

et al. 2016

Mon. Not. R. Astron. Soc.

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The past decade and a half has seen the design and execution of several groundbased spectroscopic surveys, both Galactic and Extra-galactic. Additionally, new surveys are being designed that extend the boundaries of current surveys. In this context, many important considerations must be done when designing a spectrograph for the future. Among these is the determination of the optimum wavelength coverage. In this work, we present a new code for determining the wavelength ranges that provide the optimal amount of information to achieve the required science goals for a given survey. In its first mode, it utilizes a user-defined list of spectral features to compute a figure-of-merit for different spectral configurations. The second mode utilizes a set of flux-calibrated spectra, determining the spectral regions that show the largest differences among the spectra. Our algorithm is easily adaptable for any set of science requirements and any spectrograph design. We apply the algorithm to several examples, including 4MOST, showing the method yields important design constraints to the wavelength regions.

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ELSA – training the next generation of space astrometrists

Cited by 2 publications

References 0 publications

On the relevance of chaos for halo stars in the solar neighbourhood II

On the relevance of chaos for halo stars in the solar neighbourhood II

A new algorithm for optimizing the wavelength coverage for spectroscopic studies: Spectral Wavelength Optimization Code (swoc)

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