Browsing by Author "Belokurov, V."

Now showing 1 - 8 of 8
  • Thumbnail Image
    Item
    Discovery of a thin stellar stream in the SLAMS survey
    (2018) Jethwa, P.; Torrealba, G.; Navarrete, C.; Carballo-Bello, J. A.; de Boer, T.; Erkal, D.; Koposov, S. E.; Duffau, S.; Geisler, D.; Catelan, Márcio; Belokurov, V.
  • Thumbnail Image
    Item
    Discovery of ~9000 new RR Lyrae in the southern Catalina surveys
    (2015) Torrealba, G.; Catelan, Márcio; Drake, A. J.; Djorgovski, S. G.; McNaught, R. H.; Belokurov, V.; Koposov, S.M.; Graham, M. J.; Mahabal, A.; Larson, S.; Christensen, E.
  • No Thumbnail Available
    Item
    Near-Field Cosmology with RR Lyrae Variable Stars: a first view of substructure in the southern sky
    (2016) Navarrete, C.; Duffau, S.; Vivas, A. K.; Catelan, Márcio; Hajdu, G.; Torrealba, G.; Cortés, C.; Belokurov, V.; Koposov, S.; Drake, A. J.
    We present the current status of the spectroscopic follow-up of a large number of RR Lyrae (RRL) halo overdensity candidates recently found by Torrealba et al. (2015) using southern-hemisphere data from the Catalina Real-time Transient Survey (CRTS). Characterizing the individual RRL stars in these overdensities is crucial to confirm them as real halo substructures. Low-resolution spectra have been obtained for RRL stars in 11 different overdensities, using the SOAR and Magellan telescopes. Radial velocities and metallicities have been derived so far for 123 and 99 RRL stars, respectively....
  • Thumbnail Image
    Item
    Stellar streams around the Magellanic Clouds in 4D
    (OUP, 2018) Navarrete Silva, Camila Andrea; Belokurov, V.; Catelan, Márcio; Jethwa, P.; Koposov, S. E.; Carballo-Bello, J. A.; Jofré, P.; Erkal, D.; Duffau, S.; Corral-Santan, J. M.
    We carried out a spectroscopic follow-up programme of the four new stellar stream candidates detected by Belokurov & Koposov in the outskirts of the Large Magellanic Cloud (LMC) using FORS2 (VLT). The medium-resolution spectra were used to measure the line-of-sight velocities, estimate stellar metallicities, and classify stars into Blue Horizontal Branch (BHB) and Blue Straggler (BS) stars. Using the 4-D phase-space information, we attribute approximately one half of our sample to the Magellanic Clouds, while the rest is part of the Galactic foreground. Only two of the four stream candidates are confirmed kinematically. While it is impossible to estimate the exact levels of MW contamination, the phase-space distribution of the entire sample of our Magellanic stars matches the expected velocity gradient for the LMC halo and extends as far as 33 deg (angular separation) or 29 kpc from the LMC centre. Our detections reinforce the idea that the halo of the LMC seems to be larger than previously expected, and its debris can be spread in the sky out to very large separations from the LMC centre. Finally, we provide some kinematic evidence that many of the stars analysed here have likely come from the Small Magellanic Cloud.
  • Thumbnail Image
    Item
    The Catalina Surveys Southern periodic variable star catalogue
    (2017) Drake, A. J.; Djorgovski, S. G.; Catelan, Márcio; Graham, M. J.; Mahabal, A. A.; Larson, S.; Christensen, E.; Torrealba, G.; Beshore, E.; McNaught, R. H.; Garradd, G.; Belokurov, V.; Koposov, S. E.
  • Thumbnail Image
    Item
    The Discovery of Tidal Tails around the Globular Cluster NGC 7492 with Pan-STARRS1
    (2017) Navarrete Silva, Camila Andrea; Belokurov, V.; Koposov, S. E.
  • Thumbnail Image
    Item
    The Pisces Plume and the Magellanic wake
    (2019) Belokurov, V.; Deason, A. J.; Erkal, D.; Koposov, S. E.; Carballo Bello, J. A.; Smith, M. C.; Jethwa, P.; Navarrete Silva, Camila Andrea
  • Thumbnail Image
    Item
    Unmixing the Galactic halo with RR Lyrae tagging
    (2018) Belokurov, V.; Deason, A. J.; Koposov, S. E.; Catelan, Márcio; Erkal, D.; Drake, A. J.; Evans, N. W.