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The MAGellanic Inter-Cloud (MAGIC) project - II. Slicing up the Bridge

Noel, NED, Conn, BC, Read, JI, Carrera, R, Dolphin, A and Rix, H-W (2015) The MAGellanic Inter-Cloud (MAGIC) project - II. Slicing up the Bridge Monthly Notices of the Royal Astronomical Society, 452 (4). pp. 4222-4235.

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Abstract

The origin of the gas in between the Magellanic Clouds (MCs), known as the Magellanic Bridge, has always been the subject of controversy. To shed light into this, we present the results from the MAGellanic Inter-Cloud II (MAGIC II) project aimed at probing the stellar populations in 10 large fields located perpendicular to the main ridge-line of H i in the Inter-Cloud region. We secured these observations of the stellar populations in between the MCs using the WFI (Wide Field Imager) camera on the 2.2 m telescope in La Silla. Using colour–magnitude diagrams, we trace stellar populations across the Inter-Cloud region. In good agreement with MAGIC I, we find significant intermediate-age stars in the Inter-Cloud region as well as young stars of a similar age to the last pericentre passage in between the MCs (∼200 Myr ago). We show here that the young, intermediate-age and old stars have distinct spatial distributions. The young stars correlate well with the H i gas suggesting that they were either recently stripped from the Small Magellanic Cloud (SMC) or formed in situ. The bulk of intermediate-age stars are located mainly in the Bridge region where the H i column density is higher, but they are more spread out than the young stars. They have very similar properties to stars located ∼2 kpc from the SMC centre, suggesting that they were tidally stripped from this region. Finally, the old stars extend to some 8 kpc from the SMC supporting the idea that all galaxies have a large extended metal-poor stellar halo.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Noel, NEDUNSPECIFIEDUNSPECIFIED
Conn, BCUNSPECIFIEDUNSPECIFIED
Read, JIUNSPECIFIEDUNSPECIFIED
Carrera, RUNSPECIFIEDUNSPECIFIED
Dolphin, AUNSPECIFIEDUNSPECIFIED
Rix, H-WUNSPECIFIEDUNSPECIFIED
Date : 1 October 2015
Identification Number : 10.1093/mnras/stv1614
Copyright Disclaimer : © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Uncontrolled Keywords : Galaxies: evolution, Galaxies: interactions, Local Group, Magellanic Clouds
Depositing User : Symplectic Elements
Date Deposited : 30 Mar 2017 14:27
Last Modified : 31 Oct 2017 19:13
URI: http://epubs.surrey.ac.uk/id/eprint/813862

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