On the building blocks of the M31 and Milky Way halos

On the building blocks of the M31 and Milky Way halos

We discuss the formation of the halo of M31 and the Milky Way as traced by the population of RR Lyrae stars, in comparison with the population of such stars preent in satellite dwarf galaxies. We find that both halos and the massive dwarf host a population of high amplitude short period RRab stars,...

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Main Author: Monelli Matteo
Format: Article
Language:English
Published: EDP Sciences 2017-01-01
Series:EPJ Web of Conferences
Online Access:https://doi.org/10.1051/epjconf/201715201014
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spelling doaj-df3ac2b5c2f44bf89e94e2a3269413d62021-08-02T05:38:59ZengEDP SciencesEPJ Web of Conferences2100-014X2017-01-011520101410.1051/epjconf/201715201014epjconf_puls2017_01014On the building blocks of the M31 and Milky Way halosMonelli MatteoWe discuss the formation of the halo of M31 and the Milky Way as traced by the population of RR Lyrae stars, in comparison with the population of such stars preent in satellite dwarf galaxies. We find that both halos and the massive dwarf host a population of high amplitude short period RRab stars, absent in low-mass dwarfs. These stars are explained as the metal-rich tail of the RR Lyrae distribution ([Fe/H] ∼ - 1.5), and thus their existence imply fast chemical enrichment in the host system. Their presence in both halos implies that massive building blocks had an important role in their formation.https://doi.org/10.1051/epjconf/201715201014
collection DOAJ
language English
format Article
sources DOAJ
author Monelli Matteo
spellingShingle Monelli Matteo
On the building blocks of the M31 and Milky Way halos
EPJ Web of Conferences
author_facet Monelli Matteo
author_sort Monelli Matteo
title On the building blocks of the M31 and Milky Way halos
title_short On the building blocks of the M31 and Milky Way halos
title_full On the building blocks of the M31 and Milky Way halos
title_fullStr On the building blocks of the M31 and Milky Way halos
title_full_unstemmed On the building blocks of the M31 and Milky Way halos
title_sort on the building blocks of the m31 and milky way halos
publisher EDP Sciences
series EPJ Web of Conferences
issn 2100-014X
publishDate 2017-01-01
description We discuss the formation of the halo of M31 and the Milky Way as traced by the population of RR Lyrae stars, in comparison with the population of such stars preent in satellite dwarf galaxies. We find that both halos and the massive dwarf host a population of high amplitude short period RRab stars, absent in low-mass dwarfs. These stars are explained as the metal-rich tail of the RR Lyrae distribution ([Fe/H] ∼ - 1.5), and thus their existence imply fast chemical enrichment in the host system. Their presence in both halos implies that massive building blocks had an important role in their formation.
url https://doi.org/10.1051/epjconf/201715201014
work_keys_str_mv AT monellimatteo onthebuildingblocksofthem31andmilkywayhalos
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