First Gaia Local Group Dynamics: Magellanic Clouds Proper Motion and Rotation

Abstract

We use the Gaia data release 1 (DR1) to study the proper motion (PM) fields of the Large and Small Magellanic Clouds (LMC, SMC). This uses the Tycho-Gaia Astrometric Solution (TGAS) PMs for 29 Hipparcos stars in the LMC and 8 in the SMC. The LMC PM in the West and North directions is inferred to be $({\mu }_W,{\mu }_N)=(-1.872\pm 0.045,0.224\pm 0.054)$ mas/yr, and the SMC PM $({\mu }_W,{\mu }_N)=(-0.874\pm 0.066,-1.229\pm 0.047)$ mas/yr. These results have similar accuracy and agree to within the uncertainties with existing Hubble Space Telescope (HST) PM measurements. Since TGAS uses different methods with different systematics, this provides an external validation of both data sets and their underlying approaches. Residual DR1 systematics may affect the TGAS results, but the HST agreement implies this must be below the random errors. Also in agreement with prior HST studies, the TGAS LMC PM field clearly shows the clockwise rotation of the disk, even though it takes the LMC disk in excess of $10^8$ years to complete one revolution. The implied rotation curve amplitude for young LMC stars is consistent with that inferred from line-of-sight (LOS) velocity measurements. Comparison of the PM and LOS rotation curves implies a kinematic LMC distance modulus $m-M=18.54\pm 0.39$, consistent but not yet competitive with photometric methods. These first results from Gaia on the topic of Local Group dynamics provide an indication of how its future data releases will revolutionize this field.

arXiv commentAccepted for publication in ApJ Letters. Minor modifications in response to referee suggestions

References in corpus (18)

• Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
• New Understanding of Large Magellanic Cloud Structure, Dynamics and Orbit from Carbon Star Kinematics
• Are the Magellanic Clouds on their First Passage about the Milky Way?
• Third-Epoch Magellanic Cloud Proper Motions I: HST/WFC3 data and Orbit Implications
• The RAdial Velocity Experiment (RAVE): Fourth data release
• Magellanic Cloud Structure from Near-IR Surveys I: The Viewing Angles of the LMC
• The Role of Dwarf Galaxy Interactions in Shaping the Magellanic System and Implications for Magellanic Irregulars
• The Proper Motion of the Large Magellanic Cloud using HST
• A New Look at the Kinematics of Neutral Hydrogen in the Small Magellanic Cloud
• Is the SMC Bound to the LMC? The HST Proper Motion of the SMC
• Third-Epoch Magellanic Cloud Proper Motions II: The Large Magellanic Cloud Rotation Field in Three Dimensions
• Spectroscopic Survey of Red Giants in the SMC. I: Kinematics
• The Geometric Distance and Proper Motion of the Triangulum Galaxy (M33)
• Yellow and Red Supergiants in the Large Magellanic Cloud
• Kinematics of massive stars in the Small Magellanic Cloud
• Cold and warm atomic gas around the Perseus molecular cloud I: Basic Properties
• Red Giants in the Small Magellanic Cloud. I. Disk and Tidal Stream Kinematics
• Hubble Space Telescope Proper Motions along the Sagittarius Stream: I. Observations and Results for Stars in Four Fields

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