text:   metal-poor stars in the Galactic bulge",9,"['I am proud to present: the first Pristine Inner Galaxy Survey (PIGS) paper! <LINK> 🎉 In it, we study the kinematics of metal-poor stars in the Galactic bulge region. A summary follows: [1/7] <LINK>', 'We used the anti-metal detector powers of CaHK photometry obtained at @CFHTelescope to find rare metal-poor stars in the metal-rich needle stack that is the Galactic bulge. [2/7]', ""The kinematics of the metal-poor ([Fe/H] &lt; -1) component of the bulge hasn't really been studied in detail yet. We use a sample of thousands of stars observed with AAT/AAOmega+2dF to look at how this old component behaves! [3/7]"", 'We find that the rotation of stars in the inner Galaxy decreases with decreasing metallicity, until it completely disappears for the most metal-poor stars ([Fe/H] &lt; -2), see this figure (the line is a bar model): [4/7] https://t.co/ucWKllIU0F', 'We also found a strikingly strong and continuous relation between the velocity dispersion (how hot the population is) and the metallicity: [5/7] https://t.co/0jN7F4NANR', 'We propose a few interpretations: a density transition of components of different kinematics &amp; metallicities, a different mapping of stars onto the boxy/peanut bulge and/or the influence of the bar on a pressure-supported component. Probably all of them play a role! [6/7]', 'So this is clearly not the last PIGS paper, since a lot is still unknown about this exciting population of stars..! :) [7/7] \n\n(with Twitter people @nfmartin1980, @Nico_Longeard, @kmalhan07, @Astro_Sestitof, @Thomas_gft, @Cosmic_Horizons and @FadAstra)', '@nfmartin1980 @CFHTelescope I guess I shouldn’t have put that - there... but yes, this paper is secretly about how we detected anti-matter in metal-poor stars! Should have submitted to Nature...', '@arm2armtweet Do you recognise the giraffe plot?!']",19,10,1759