Now showing items 5-8 of 446

    • The Milky Way Halo in Action Space 

      Myeong, GC; Evans, NW; Belokurov, V; Sanders, JL; Koposov, SE (IoP Publishing, 2018-04-01)
      We analyze the structure of the local stellar halo of the Milky Way using ~60000 stars with full phase space coordinates extracted from the SDSS–Gaia catalog. We display stars in action space as a function of metallicity ...
    • Observational hertzsprung-russell diagrams 

      Babusiaux, C; Van Leeuwen, F; Barstow, MA; Jordi, C; Vallenari, A; Bossini, D; Bressan, A et al. (EDP Sciences, 2018)
      We highlight the power of the Gaia DR2 in studying many fine structures of the Hertzsprung-Russell diagram (HRD). Gaia allows us to present many different HRDs, depending in particular on stellar population selections. We ...
    • Homogeneous Analysis of the Dust Morphology of Transition Disks Observed with ALMA: Investigating Dust Trapping and the Origin of the Cavities 

      Pinilla, P; Tazzari, M; Pascucci, I; Youdin, AN; Garufi, A; Manara, CF; Testi, L et al. (American Astronomical Society, 2018)
      We analyze the dust morphology of 29 transition disks (TDs) observed with ALMA at (sub-) millimeter-emission. We perform the analysis in the visibility plane to characterize the total flux, cavity size, and shape of the ...
    • Discovery of fe Kα X-Ray reverberation around the black holes in MCG-5-23-16 and NGC 7314 

      Zoghbi, A; Reynolds, C; Cackett, EM; Miniutti, G; Kara, E; Fabian, AC (American Astronomical Society, 2013)
      Several X-ray observations have recently revealed the presence of reverberation time delays between spectral components in AGN. Most of the observed lags are between the power-law Comptonization component, seen directly, ...