Search Publications
Comet 67P/Churyumov-Gerasimenko: Close-up on Dust Particle Fragments
Langevin, Y.; Altwegg, K.; Krüger, H. +44 more
The COmetary Secondary Ion Mass Analyser instrument on board ESA's Rosetta mission has collected dust particles in the coma of comet 67P/Churyumov-Gerasimenko. During the early-orbit phase of the Rosetta mission, particles and particle agglomerates have been imaged and analyzed in the inner coma at distances between 100 km and 10 km off the cometa…
Molecular gas in the halo fuels the growth of a massive cluster galaxy at high redshift
Pentericci, L.; Villar-Martín, M.; Dannerbauer, H. +19 more
The largest galaxies in the universe reside in galaxy clusters. Using sensitive observations of carbon monoxide, we show that the Spiderweb galaxy—a massive galaxy in a distant protocluster—is forming from a large reservoir of molecular gas. Most of this molecular gas lies between the protocluster galaxies and has low velocity dispersion, indicati…
The CALYMHA survey: Lyα escape fraction and its dependence on galaxy properties at z = 2.23
Smail, Ian; Sobral, David; Matthee, Jorryt +4 more
We present the first results from our CAlibrating LYMan α with Hα (CALYMHA) pilot survey at the Isaac Newton Telescope. We measure Lyα emission for 488 Hα selected galaxies at z = 2.23 from High-z Emission Line Survey in the COSMOS and UDS fields with a specially designed narrow-band filter (λc = 3918 Å, Δλ = 52 Å). We find 17 dual Hα-L…
Wave analysis in the atmosphere of Venus below 100-km altitude, simulated by the LMD Venus GCM
Lebonnois, Sébastien; Sugimoto, Norihiko; Gilli, Gabriella
A new simulation of Venus atmospheric circulation obtained with the LMD Venus GCM is described and the simulated wave activity is analyzed. Agreement with observed features of the temperature structure, static stability and zonal wind field is good, such as the presence of a cold polar collar, diurnal and semi-diurnal tides. At the resolution used…
A young star-forming galaxy at z = 3.5 with an extended Lyman α halo seen with MUSE
Bacon, Roland; Blaizot, Jérémy; Brinchmann, Jarle +12 more
Spatially resolved studies of high-redshift galaxies, an essential insight into galaxy formation processes, have been mostly limited to stacking or unusually bright objects. We present here the study of a typical (L*, M⋆ = 6 × 109 M⊙) young lensed galaxy at z = 3.5, observed with Multi Unit Spectroscopic Explorer (…
Gaia Data Release 1. Reference frame and optical properties of ICRF sources
Holl, B.; Biermann, M.; Hutton, A. +18 more
Context. As part of the data processing for Gaia Data Release 1 (Gaia DR1) a special astrometric solution was computed, the so-called auxiliary quasar solution. This gives positions for selected extragalactic objects, including radio sources in the second realisation of the International Celestial Reference Frame (ICRF2) that have optical counterp…
The H I Content of the Universe Over the Past 10 GYRS
Prochaska, J. Xavier; Rafelski, Marc; Neeleman, Marcel +4 more
We use the Hubble Space Telescope (HST) archive of ultraviolet (UV) quasar spectroscopy to conduct the first blind survey for damped Lyα absorbers (DLAs) at low redshift (z\lt 1.6). Our statistical sample includes 463 quasars with spectral coverage spanning a total redshift path {{Δ }}z=123.3 or an absorption path {{Δ }}X=229.7. Within this survey…
A deep XMM-Newton study of the hot gaseous halo around NGC 1961
Bregman, Joel N.; Churazov, Eugene; Anderson, Michael E.
We examine 11 XMM-Newton observations of the giant spiral galaxy NGC 1961, allowing us to study the hot gaseous halo of a spiral galaxy in unprecedented detail. We perform a spatial and a spectral analysis; with the former, the hot halo is detected to at least 80 kpc and with the latter its properties can be measured in detail up to 42 kpc. We fin…
AGN are cooler than you think: the intrinsic far-IR emission from QSOs
Oliver, S. J.; Page, M. J.; Symeonidis, M. +4 more
We present an intrinsic AGN spectral energy distribution (SED) extending from the optical to the submm, derived with a sample of unobscured, optically luminous (νLν,5100 > 1043.5 erg s-1) QSOs at z < 0.18 from the Palomar Green survey. The intrinsic AGN SED was computed by removing the contribution from stars…
ALFALFA Discovery of the Most Metal-poor Gas-rich Galaxy Known: AGC 198691
McQuinn, Kristen B. W.; Cannon, John M.; Skillman, Evan D. +12 more
We present spectroscopic observations of the nearby dwarf galaxy AGC 198691. This object is part of the Survey of H I in Extremely Low-Mass Dwarfs project, which is a multi-wavelength study of galaxies with H I masses in the range of 106-107.2 M ⊙, discovered by the Arecibo Legacy Fast ALFA (ALFALFA) survey. We hav…