Clouds, Streams and Bridges. Redrawing the blueprint of the Magellanic System with Gaia DR1

Abstract

We present the discovery of stellar tidal tails around the Large and the Small Magellanic Clouds in the Gaia DR1 data. In between the Clouds, their tidal arms are stretched towards each other to form an almost continuous stellar bridge. Our analysis relies on the exquisite quality of the Gaia's photometric catalogue to build detailed star-count maps of the Clouds. We demonstrate that the Gaia DR1 data can be used to detect variable stars across the whole sky, and in particular, RR Lyrae stars in and around the LMC and the SMC. Additionally, we use a combination of Gaia and Gale to follow the distribution of Young Main Sequence stars in the Magellanic System. Viewed by Gaia, the Clouds show unmistakable signs of interaction. Around the LMC, clumps of RR Lyrae are observable as far as ~20 degrees, in agreement with the most recent map of Mira-like stars reported in Deason et al (2016). The SMC's outer stellar density contours show a characteristic S-shape, symptomatic of the on-set of tidal stripping. Beyond several degrees from the center of the dwarf, the Gaia RR Lyrae stars trace the Cloud's trailing arm, extending towards the LMC. This stellar tidal tail mapped with RR Lyrae is not aligned with the gaseous Magellanic Bridge, and is shifted by some ~5 degrees from the Young Main Sequence bridge. We use the offset between the bridges to put constraints on the density of the hot gaseous corona of the Milky Way.

arXiv commentSubmitted to MNRAS

References in corpus (29)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent
• Are the Magellanic Clouds on their First Passage about the Milky Way?
• HI in Local Group Dwarf Galaxies and Stripping by the Galactic Halo
• The Milky Way stellar halo out to 40 kpc : Squashed, broken but smooth
• The Origin of the Magellanic Stream and Its Leading Arm
• "Skinny Milky Way, Please", says Sagittarius
• Probing the Outer Galactic halo with RR Lyrae from the Catalina Surveys
• The Araucaria Project. The distance to the Small Magellanic Cloud from late-type eclipsing binaries
• Precession of the Sagittarius stream
• Do Hot Haloes Around Galaxies Contain the Missing Baryons?
• The Tidal Origin of the Magellanic Stream and the Possibility of a Stellar Counterpart
• Broken and unbroken: the Milky Way and M31 stellar haloes
• A Population of Accreted SMC Stars in the LMC
• The cold veil of the Milky Way stellar halo
• Small-Scale Structure in the SDSS and LCDM: Isolated L* Galaxies with Bright Satellites
• Unveiling the corona of the Milky Way via ram-pressure stripping of dwarf satellites
• The Ultraviolet Sky: An Overview from the GALEX Surveys
• Statistics of Satellite Galaxies Around Milky Way-Like Hosts
• The Magellanic Bridge: The Nearest Purely Tidal Stellar Population
• Discovery of $\sim$ 9,000 new RR Lyrae in the Southern Catalina Surveys
• The Magellanic Stream System: I. Ram-pressure tails and the relics of the collision between the Magellanic Clouds
• Touching The Void: A Striking Drop in Stellar Halo Density Beyond 50 kpc
• A 10 kpc stellar substructure at the edge of the Large Magellanic Cloud: perturbed outer disk or evidence for tidal stripping?
• Stellar streams around the Magellanic Clouds
• Gaia Data Release 1 - The Cepheid & RR Lyrae star pipeline and its application to the south ecliptic pole region
• The Origin of the Microlensing Events Observed Towards the LMC and the Stellar Counterpart of the Magellanic Stream
• The LMC geometry and outer stellar populations from early DES data
• The Tidal Tails of NGC 5466

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