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Identifying Active Kelvin-Helmholtz Vortices on Saturn's Magnetopause Boundary
Delamere, P. A.; Johnson, J. R.; Burkholder, B. L. +1 more
For ∼2,000 Cassini magnetopause encounters, we analyse plasma and magnetic fields. The boundary can be unstable to the Kelvin-Helmholtz instability (KHI), which can drive large-scale flows identifiable in plasma measurements. Bulk flow reversed from the expected direction near the magnetopause can indicate vorticity associated with active KH, and …
Linking the small-scale relativistic winds and the large-scale molecular outflows in the z = 1.51 lensed quasar HS 0810+2554
Cappi, M.; Vignali, C.; Comastri, A. +7 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of the quadruply lensed z = 1.51 quasar HS 0810+2554 which provide useful insight on the kinematics and morphology of the CO molecular gas and the ∼ 2 mm-continuum emission in the quasar host galaxy. Lens modelling of the mm-continuum and the spectrally integrated CO(J = 3…
Properties of the Milky Way's Old Populations Based on Photometric Metallicities of the OGLE RR Lyrae Stars
Soszyński, I.; Udalski, A.; Szymański, M. K. +11 more
We have used photometric data on almost 91 000 fundamental-mode RR Lyr stars (type RRab) detected by the OGLE survey to investigate properties of old populations in the Milky Way. Based on their metallicity distributions, we demonstrate that the Galaxy is built from three distinct old components: halo, bulge, and disk. The distributions reach thei…
An ancient double degenerate merger in the Milky Way halo
Vennes, Stéphane; Ferrario, Lilia; Kawka, Adela
We present an analysis and re-appraisal of the massive, carbon-enriched (DQ) white dwarf (WD) LP 93-21. Its high mass ( ≈1.1 M⊙) and membership to the class of warm DQ WDs, combined with its peculiar halo kinematics suggest that this object is the product of an ancient stellar merger event, most likely that of two WDs. Furthermore, the …
The Smallest Scale of Hierarchy survey (SSH) - I. Survey description
Cignoni, M.; Tosi, M.; Bellazzini, M. +7 more
The Smallest Scale of Hierarchy (SSH) survey is an ongoing strategic large program at the Large Binocular Telescope, aimed at the detection of faint stellar streams and satellites around 45 late-type dwarf galaxies located in the Local Universe within ≃10 Mpc. SSH exploits the wide-field, deep photometry provided by the Large Binocular Cameras in …
The XMM deep survey in the CDFS. XI. X-ray spectral properties of 185 bright sources
Brandt, W. N.; Vignali, C.; Gilli, R. +11 more
We present the X-ray spectra of 185 bright sources detected in the XMM-Newton deep survey of the Chandra Deep Field South with the three EPIC cameras combined. The 2-10 keV flux limit of the sample is 2 × 10-15 erg s-1 cm-2. The sources are distributed over a redshift range of z = 0.1-3.8, with 11 new X-ray redshif…
Erratum: The Herschel Bright Sources (HerBS): sample definition and SCUBA-2 observations
Ivison, R. J.; Omont, A.; Clements, D. L. +20 more
A study of the physical properties of SB2s with both the visual and spectroscopic orbits
Tamazian, Vakhtang S.; Campo, Pedro P.; Piccotti, Luca +4 more
The study of a selected set of 69 double-lined spectroscopic binaries (SB2) with well-defined visual and spectroscopic orbits was carried out. The orbital parallax, the mass, the colour, and the luminosity of each component were derived from observational data for almost all of these systems. We have also obtained an independent estimation of the …
Precise calibration of the dependence of surface brightness-colour relations on colour and class for late-type stars
White, T. R.; Huber, D.; Farrington, C. D. +9 more
Context. Surface brightness-colour relations (SBCRs) are used to derive the stellar angular diameters from photometric observations. They have various astrophysical applications, such as the distance determination of eclipsing binaries or the determination of exoplanet parameters. However, strong discrepancies between the SBCRs still exist in the …
Solar-Cycle Variation of the Subsurface Flows of Active- and Quiet-Region Subsets
Howe, R.; Komm, R.; Hill, F.
We study the solar-cycle variation of subsurface flows for both active and quiet solar regions. We derive flows from the surface to a depth of 16 Mm using ring-diagram analysis applied to Dopplergrams obtained with the Michelson Doppler Imager (MDI) Dynamics Program, the Global Oscillation Network Group (GONG), and the Helioseismic and Magnetic Im…