Search Results - "Koposov, Sergey"

Stellar streams around the Magellanic Clouds by Belokurov, Vasily, Koposov, Sergey E.

“…Using blue horizontal branch (BHB) stars identified in the Dark Energy Survey (DES) Year 1 data, we report the detection of an extended and lumpy stellar…”
Get full text

Common origin for Hercules-Aquila and Virgo Clouds in Gaia DR2 by Simion, Iulia T, Belokurov, Vasily, Koposov, Sergey E

Get full text

Completeness of the Gaia-verse – IV. The astrometry spread function of Gaia DR2 by Everall, Andrew, Boubert, Douglas, Koposov, Sergey E, Smith, Leigh, Holl, Berry

“…ABSTRACT Gaia Data Release 2 (DR2) published positions, parallaxes, and proper motions for an unprecedented 1331 909 727 sources, revolutionizing the field of…”
Get full text

Chemodynamical properties of the Anticentre Stream: a surviving disc fossil from a past satellite interaction by Laporte, Chervin F P, Belokurov, Vasily, Koposov, Sergey E, Smith, Martin C, Hill, Vanessa

“…ABSTRACT Using Gaia second data release (DR2), we trace the Anticentre Stream (ACS) in various stellar populations across the sky and find that it is…”
Get full text

The halo’s ancient metal-rich progenitor revealed with BHB stars by Lancaster, Lachlan, Koposov, Sergey E, Belokurov, Vasily, Evans, N Wyn, Deason, Alis J

“…Abstract Using the data from the Sloan Digital Sky Survey and the Gaia satellite, we assemble a pure sample of ∼3000 blue horizontal branch (BHB) stars with 7D…”
Get full text

Unresolved stellar companions with Gaia DR2 astrometry by Belokurov, Vasily, Penoyre, Zephyr, Oh, Semyeong, Iorio, Giuliano, Hodgkin, Simon, Evans, N Wyn, Everall, Andrew, Koposov, Sergey E, Tout, Christopher A, Izzard, Robert, Clarke, Cathie J, Brown, Anthony G A

“…ABSTRACT For stars with unresolved companions, motions of the centre of light and that of mass decouple, causing a single-source astrometric model to perform…”
Get full text

Detection of the LMC-induced sloshing of the Galactic halo by Erkal, Denis, Deason, Alis J, Belokurov, Vasily, Xue, Xiang-Xiang, Koposov, Sergey E, Bird, Sarah A, Liu, Chao, Simion, Iulia T, Yang, Chengqun, Zhang, Lan, Zhao, Gang

“…ABSTRACT A wealth of recent studies have shown that the LMC is likely massive, with a halo mass >1011 M⊙. One consequence of having such a nearby and massive…”
Get full text

Constraining the shape of Milky Way satellites with distance gradients by An, Zhaozhou, Koposov, Sergey E

“…ABSTRACT We combine the Dark Energy Camera Legacy Survey DR8 photometry with Gaia photometry to study the 3D structure of Bootes I, Draco, Ursa Minor, Sextans,…”
Get full text

Constraining the Milky Way Potential with a Six-Dimensional Phase-Space Map of the GD-1 Stellar Stream by Koposov, Sergey E, Rix, Hans-Walter, Hogg, David W

“…The narrow GD-1 stream of stars, spanning 60{sup 0} on the sky at a distance of {approx}10 kpc from the Sun and {approx}15 kpc from the Galactic center, is…”
Get full text

Snake in the Clouds: a new nearby dwarf galaxy in the Magellanic bridge by Koposov, Sergey E, Walker, Matthew G, Belokurov, Vasily, Casey, Andrew R, Geringer-Sameth, Alex, Mackey, Dougal, Da Costa, Gary, Erkal, Denis, Jethwa, Prashin, Mateo, Mario, Olszewski, Edward W, Bailey, John I

Get full text

Search for globular clusters associated with the Milky Way dwarf galaxies using Gaia DR2 by Huang, Kuan-Wei, Koposov, Sergey E

“…ABSTRACT We report the result of searching for globular clusters (GCs) around 55 Milky Way (MW) satellite dwarf galaxies within the distance of 450 kpc from…”
Get full text

200 000 candidate very metal-poor stars in Gaia DR3 XP spectra by Ji, Alexander P, Koposov, Sergey E, Limberg, Guilherme

“…ABSTRACT Very metal-poor stars ($\rm [Fe/H] \lt -2$) in the Milky Way are fossil records of early chemical evolution and the assembly and structure of the…”
Get full text

To the Galactic Virial Radius with Hyper Suprime-Cam by Deason, Alis J., Belokurov, Vasily, Koposov, Sergey E.

“…We exploit the exquisite, deep Hyper Suprime-Cam (HSC) imaging data to probe the Galactic halo out to 200 kpc. Using the ∼100 square degree, multiband…”
Get full text

Indication of Gamma-Ray Emission from the Newly Discovered Dwarf Galaxy Reticulum II by Geringer-Sameth, Alex, Walker, Matthew G, Koushiappas, Savvas M, Koposov, Sergey E, Belokurov, Vasily, Torrealba, Gabriel, Evans, N Wyn

“…We present a search for γ-ray emission from the direction of the newly discovered dwarf galaxy Reticulum II. Using Fermi-LAT Collaboration data, we detect a…”
Get full text

The Pisces Plume and the Magellanic wake by Belokurov, Vasily, Deason, Alis J, Erkal, Denis, Koposov, Sergey E, Carballo-Bello, Julio A, Smith, Martin C, Jethwa, Prashin, Navarrete, Camila

“…ABSTRACT Using RR Lyrae stars in the Gaia Data Release 2 and Pan-STARRS1 we study the properties of the Pisces overdensity, a diffuse substructure in the outer…”
Get full text

Catalogues of active galactic nuclei from Gaia and unWISE data by Shu, Yiping, Koposov, Sergey E, Evans, N Wyn, Belokurov, Vasily, McMahon, Richard G, Auger, Matthew W, Lemon, Cameron A

“…ABSTRACT We present two catalogues of active galactic nucleus (AGN) candidates selected from the latest data of two all-sky surveys – Data Release 2 of the…”
Get full text

Identifying RR Lyrae in the ZTF DR3 data set by Huang, Kuan-Wei, Koposov, Sergey E

“…ABSTRACT We present an RR Lyrae (RRL) catalogue based on the combination of the third data release of the Zwicky Transient Facility (ZTF DR3) and Gaia EDR3. We…”
Get full text

Crater 2: An Extremely Cold Dark Matter Halo by Caldwell, Nelson, Walker, Matthew G., Mateo, Mario, Olszewski, Edward W., Koposov, Sergey, Belokurov, Vasily, Torrealba, Gabriel, Geringer-Sameth, Alex, Johnson, Christian I.

“…We present results from MMT/Hectochelle spectroscopy of 390 red giant candidate stars along the line of sight to the recently discovered Galactic satellite…”
Get full text

Gravitationally lensed quasars in Gaia: I. Resolving small-separation lenses by Lemon, Cameron A., Auger, Matthew W., McMahon, Richard G., Koposov, Sergey E.

“…Abstract Gaia's exceptional resolution (FWHM ∼ 0.1 arcsec) allows identification and cataloguing of the multiple images of gravitationally lensed quasars. We…”
Get full text

BEASTS OF THE SOUTHERN WILD: DISCOVERY OF NINE ULTRA FAINT SATELLITES IN THE VICINITY OF THE MAGELLANIC CLOUDS by Koposov, Sergey E., Belokurov, Vasily, Torrealba, Gabriel, Evans, N. Wyn

“…ABSTRACT We have used the publicly released Dark Energy Survey (DES) data to hunt for new satellites of the Milky Way (MW) in the southern hemisphere. Our…”
Get full text