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The effects of the selection function on metallicity trends in spectroscopic surveys of the Milky Way

Published online by Cambridge University Press:  02 August 2018

G. Nandakumar ,
M. Schultheis ,
M. Hayden ,
A. Rojas-Arriagada ,
G. Kordopatis Open the ORCID record for G. Kordopatis [Opens in a new window]  and
M. Haywood
G. Nandakumar
Affiliation:
Laboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Blvd de l’Observatoire, F-06304 Nice, France; email: govind.nandakumar@oca.eu
M. Schultheis
Affiliation:
Laboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Blvd de l’Observatoire, F-06304 Nice, France; email: govind.nandakumar@oca.eu
M. Hayden
Affiliation:
Laboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Blvd de l’Observatoire, F-06304 Nice, France; email: govind.nandakumar@oca.eu
A. Rojas-Arriagada
Affiliation:
Laboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Blvd de l’Observatoire, F-06304 Nice, France; email: govind.nandakumar@oca.eu Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Santiago, Chile Millennium Institute of Astrophysics, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile
G. Kordopatis
Affiliation:
Laboratoire Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Blvd de l’Observatoire, F-06304 Nice, France; email: govind.nandakumar@oca.eu
M. Haywood
Affiliation:
GEPI, Observatoire de Paris, PSL Research University, CNRS, Univ Paris Diderot, Sorbonne Paris Cité, Place Jules Janssen, 92195 Meudon, France
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Abstract

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We investigate here the effect of the selection function on the metallicity distribution function (MDF) as well as on the vertical metallicity gradient by studying similar lines-of-sight using four different spectroscopic surveys (APOGEE, LAMOST, RAVE and Gaia-ESO) which have different targeting strategies and therefore different selection functions. We create mock fields for each survey using two stellar population synthesis models, GALAXIA and TRILEGAL. The effects of the selection function are studied in detail by applying the selection function to the two models and comparing the MDF as well as vertical metallicity gradients of the selected sources with that of the underlying sample. We find a negligible selection function effect on the MDF as well as on the vertical metallicity gradients for APOGEE, RAVE and LAMOST, and estimate a mean vertical metallicity gradient of -0.241±0.028 dex kpc−1.

Keywords

Galaxy: solar neighbourhoodstellar contentdiskabundancesevolutiongeneral
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 345 - 346
Copyright
Copyright © International Astronomical Union 2018 

References

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Nandakumar, G., Schultheis, M., Hayden, M., et al. 2017, arXiv:1707.09932Google Scholar