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CO Emission in Infrared-selected Active Galactic Nuclei
Kirkpatrick, Allison; Pope, Alexandra; Keller, Erica +1 more
In order to better understand how active galactic nuclei (AGNs) affect the interstellar media of their host galaxies, we perform a meta-analysis of the CO emission for a sample of z = 0.01-4 galaxies from the literature with existing CO detections and well-constrained AGN contributions to the infrared (67 galaxies). Using either Spitzer/IRS mid-in…
The VANDELS survey: the role of ISM and galaxy physical properties in the escape of Lyα emission in z ∼ 3.5 star-forming galaxies
Maccagni, D.; Schaerer, D.; Finkelstein, S. L. +21 more
Aims: We wish to investigate the physical properties of a sample of Lyα emitting galaxies in the VANDELS survey, with particular focus on the role of kinematics and neutral hydrogen column density in the escape and spatial distribution of Lyα photons.
Methods: From all the Lyα emitting galaxies in the VANDELS Data Release 2 at 3.5 ≲ z ≲ …
The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: The Fourth and Fifth Data Releases
Feng, Xiaotong; Luo, A. -L.; Zhao, Y. -H. +15 more
We present Data Releases 4 and 5 of the quasar catalog from the quasar survey by the Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST), which includes quasars observed between 2015 September and 2017 June. There are a total of 19,253 quasars identified by visual inspections of the spectra. Among them, 11,458 were independently dis…
Spatially Resolved Stellar Kinematics of the Ultra-diffuse Galaxy Dragonfly 44. II. Constraints on Fuzzy Dark Matter
van Dokkum, Pieter; Forbes, Duncan A.; Romanowsky, Aaron J. +9 more
Given the absence of directly detected dark matter (DM) as weakly interacting massive particles, there is strong interest in the possibility that DM is an ultralight scalar field, here denoted as “fuzzy” DM. Ultra-diffuse galaxies, with the sizes of giant galaxies and the luminosities of dwarf galaxies, have a wide range of DM halo masses, thus pr…
The magnetic propeller accretion regime of LkCa 15
Moutou, C.; Ménard, F.; Carmona, A. +12 more
We present a spectropolarimetric study of the classical T Tauri star (cTTS) LkCa 15 investigating the large-scale magnetic topology of the central star and the way the field connects to the inner regions of the accretion disc. We find that the star hosts a strong poloidal field with a mainly axisymmetric dipole component of 1.35 kG, whereas the ma…
Transverse kinematics of the Galactic bar-bulge from VVV and Gaia
Evans, N. Wyn; Sanders, Jason L.; Lucas, Philip +1 more
We analyse the kinematics of the Galactic bar-bulge using proper motions from the ESO public survey Vista Variables in the Via Lactea (VVV) and the second Gaia data release. Gaia has provided some of the first absolute proper motions within the bulge and the near-infrared VVV multi-epoch catalogue complements Gaia in highly extincted low-latitude …
The shapes of the rotation curves of star-forming galaxies over the last ≈10 Gyr
Bacon, Roland; Smail, Ian; Swinbank, A. M. +16 more
We analyse maps of the spatially resolved nebular emission of ≈1500 star-forming galaxies at z ≈ 0.6-2.2 from deep K-band Multi-Object Spectrograph and MUSE observations to measure the average shape of their rotation curves. We use these to test claims for declining rotation curves at large radii in galaxies at z ≈ 1-2 that have been interpreted a…
The Hubble PanCET program: an extensive search for metallic ions in the exosphere of GJ 436 b
Sanz-Forcada, J.; Ehrenreich, D.; Lecavelier des Etangs, A. +15 more
Context. The quiet M2.5 star GJ 436 hosts a warm Neptune that displays an extended atmosphere that dwarfs its own host star. Predictions of atmospheric escape in such planets state that H atoms escape from the upper atmosphere in a collisional regime and that the flow can drag heavier atoms to the upper atmosphere. It is unclear, however, what ast…
Contributions from Accreted Organics to Titan’s Atmosphere: New Insights from Cometary and Chondritic Data
Miller, Kelly E.; Glein, Christopher R.; Waite, J. Hunter, Jr.
Since its discovery in the first half of the 20th century, scientists have puzzled over the origins of Titan’s atmosphere. Current models suggest that atmospheric N2 on Titan may have originated from NH3-bearing ice with N-isotopic ratios similar to those observed in NH2 in cometary comae (14N/15
In Situ Measurements of the Variable Slow Solar Wind near Sector Boundaries
Davies, J. A.; Lavraud, B.; Kilpua, E. +2 more
The release of density structures at the tip of the coronal helmet streamers, likely as a consequence of magnetic reconnection, contributes to the mass flux of the slow solar wind (SSW). In situ measurements in the vicinity of the heliospheric plasma sheet of the magnetic field, protons, and suprathermal electrons reveal details of the processes a…