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タイムリーなことに、今日はGaia衛星による🌌天の川銀河のストリーム構造の話を対面で聞く機会を得た 長いOrphan stream の個々の星の速度の向きが一致しなきことから、遭遇した大マゼラン雲(LMC)の重力による摂動として、LMCの質量を決定 https://t.co/5ZmQynKBQg https:…
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The LMC is a natural candidate for this and many of the streams have proper motions pulled towards the recent track of the LMC. We saw this previously with the Orphan (aka Chenab) stream (https://t.co/v4SQ8hDsjG) which passes close to the LMC and receiv…
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RT @neuronomer: 2) Orphan Stream has a weird kink in the South. The OATs argue this is explained by the fly-by of the LMC and infer an LMC…
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We expect that not all of the MW will have been accelerated by this amount and thus there should see a bulk velocity upwards in the outskirts of the Milky Way with future observations (or maybe even in Gaia). See https://t.co/v4SQ8hDsjG for more details…