Search Publications
The HDUV Survey: Six Lyman Continuum Emitter Candidates at z ∼ 2 Revealed by HST UV Imaging
Oesch, P. A.; Carollo, C. M.; Nelson, E. J. +14 more
We present six galaxies at z∼ 2 that show evidence of Lyman continuum (LyC) emission based on the newly acquired UV imaging of the Hubble Deep UV legacy survey (HDUV) conducted with the WFC3/UVIS camera on the Hubble Space Telescope (HST). At the redshift of these sources, the HDUV F275W images partially probe the ionizing continuum. By exploiting…
Disruption of Saturn's quasi-periodic equatorial oscillation by the great northern storm
Fletcher, Leigh N.; Irwin, Patrick G. J.; Flasar, F. Michael +7 more
The equatorial middle atmospheres of the Earth1, Jupiter2 and Saturn3,4 all exhibit a remarkably similar phenomenon—a vertical, cyclic pattern of alternating temperatures and zonal (east-west) wind regimes that propagate slowly downwards with a well-defined multi-year period. Earth's quasi-biennial oscillation (QBO…
Galactic winds with MUSE: A direct detection of Fe II* emission from a z = 1.29 galaxy
Bacon, Roland; Finley, Hayley; Bouché, Nicolas +13 more
Emission signatures from galactic winds provide an opportunity to directly map the outflowing gas, but this is traditionally challenging because of the low surface brightness. Using very deep observations (27 h) of the Hubble Deep Field South with the Multi Unit Spectroscopic Explorer (MUSE) instrument, we identify signatures of an outflow in both…
Staying away from the bar: the local dynamical signature of slow and fast bars in the Milky Way
Siebert, Arnaud; Famaey, Benoit; Bienaymé, Olivier +3 more
Both the three-dimensional density of red clump giants and the gas kinematics in the inner Galaxy indicate that the pattern speed of the Galactic bar could be much lower than previously estimated. Here, we show that such slow bar models are unable to reproduce the bimodality observed in local stellar velocity space. We do so by computing the respo…
Formation of Methylamine and Ethylamine in Extraterrestrial Ices and Their Role as Fundamental Building Blocks of Proteinogenic α-amino Acids
Kaiser, Ralf I.; Förstel, Marko; Bergantini, Alexandre +2 more
The -CH-NH2 moiety represents the fundamental building block of all proteinogenic amino acids, with the cyclic amino acid proline being a special case (-CH-NH- in proline). Exploiting a chemical retrosynthesis, we reveal that methylamine (CH3NH2) and/or ethylamine (CH3CH2NH2) are es…
Powerful outflows in the central parsecs of the low-luminosity active galactic nucleus NGC 1386
Prieto, M. A.; Luque, R.; Müller-Sánchez, F. +3 more
Low-luminosity active galactic nuclei, I.e. L_{bol}/Ledd ∼ 10-6-10-3, constitute the bulk population of active galactic nuclei (AGNs). Powerful jets, common in these objects, are a crucial source of feedback energy-driving mass outflows into the host galaxy and the intergalactic medium. This paper reports the first…
A Surface Density Perturbation in the TW Hydrae Disk at 95 au Traced by Molecular Emission
Henning, Th.; van Boekel, R.; Birnstiel, T. +6 more
We present ALMA Cycle 2 observations at 0.″5 resolution of TW Hya of CS J=5-4 emission. The radial profile of the integrated line emission displays oscillatory features outward of 1.″5 (≈ 90 au). A dip-like feature at 1.″6 is coincident in location, depth, and width with features observed in dust scattered light at near-infrared wavelengths. Using…
Optical Line Emission from z ∼ 6.8 Sources with Deep Constraints on Lyα Visibility
Maiolino, R.; Finkelstein, S. L.; Castellano, M. +15 more
We analyze a sample of z-dropout galaxies in the CANDELS GOODS South and UDS fields that have been targeted by a dedicated spectroscopic campaign aimed at detecting their Lyα line. Deep IRAC observations at 3.6 and 4.5 µm are used to determine the strength of optical emission lines affecting these bands at z ∼ 6.5-6.9 in order to (1) investi…
Chemical Cartography. I. A Carbonicity Map of the Galactic Halo
Yoon, Jinmi; Beers, Timothy C.; Lee, Young Sun +5 more
We present the first map of carbonicity, [C/Fe], for the halo system of the Milky Way, based on a sample of over 100,000 main-sequence turnoff stars with available spectroscopy from the Sloan Digital Sky Survey. This map, which explores distances up to 15 kpc from the Sun, reveals clear evidence for the dual nature of the Galactic halo, based on t…
Idunn Mons on Venus: Location and extent of recently active lava flows
Helbert, Jörn; D'Incecco, Piero; D'Amore, Mario +1 more
From 2006 until 2014 the ESA Venus Express probe observed the atmosphere and surface of the Earth's twin planet. The Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) has provided data that indicate the occurrence of recent volcanic activity on Venus. We selected the eastern flank of Idunn Mons - Imdr Regio's single large volcano - as the…