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What do RR Lyrae tell us about the formation of the Milky Way and M31 haloes?

Published online by Cambridge University Press:  02 August 2018

C. Gallart ,
G. Fiorentino Open the ORCID record for G. Fiorentino [Opens in a new window] ,
M. Monelli ,
C. Martínez-Vázquez ,
E. J. Bernard Open the ORCID record for E. J. Bernard [Opens in a new window] ,
G. Bono  and
P. B. Stetson
C. Gallart
Affiliation:
Instituto de Astrofísica de Canarias, Spain;
G. Fiorentino
Affiliation:
INAF-Osservatorio Astronomico di Bologna, Italy;
M. Monelli
Affiliation:
Instituto de Astrofísica de Canarias, Spain;
C. Martínez-Vázquez
Affiliation:
INAF-Osservatorio Astronomico di Bologna, Italy;
E. J. Bernard
Affiliation:
Université Côte d’Azur, CNRS, France;
G. Bono
Affiliation:
Dipartimento di Fisica, Università di Roma Tor Vergata, Italy;
P. B. Stetson
Affiliation:
Herzberg Astronomy and Astrophysics, NRC, Canada
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RR Lyrae variables are old (>10 Gyr) stars and, as such, they are useful probes of the earliest events of star formation in galaxies (Bernard et al. 2008, Martínez-Vázquez et al. 2016) as well as of the galaxy assembly process predicted by ΛCDM simulations of structure formation. In fact, the nature of the building-blocks of galaxies such as the Milky Way, and in particular, those of their stellar haloes, has been a matter of a substantial debate (Venn et al. 2004). Unlike other stellar tracers, RR Lyrae offer a snapshot of the stellar content present at the epoch when most of the merging action is predicted to have taken place, and thus they are ideal witnesses of this process.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 290 - 291
Copyright
Copyright © International Astronomical Union 2018 

References

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