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The TW Hya Rosetta Stone Project. II. Spatially Resolved Emission of Formaldehyde Hints at Low-temperature Gas-phase Formation
Wilner, David J.; Cleeves, L. Ilsedore; Walsh, Catherine +15 more
Formaldehyde (H2CO) is an important precursor to organics like methanol (CH3OH). It is important to understand the conditions that produce H2CO and prebiotic molecules during star and planet formation. H2CO possesses both gas-phase and solid-state formation pathways, involving either UV-produced radical …
The GOGREEN survey: dependence of galaxy properties on halo mass at z > 1 and implications for environmental quenching
Cooper, M. C.; Muzzin, Adam; Vulcani, Benedetta +18 more
We use photometric redshifts and statistical background subtraction to measure stellar mass functions in galaxy group-mass (4.5-8 × 1013 M⊙) haloes at 1 < z < 1.5. Groups are selected from COSMOS and SXDF, based on X-ray imaging and sparse spectroscopy. Stellar mass (Mstellar) functions are computed for quies…
Evaluation of CME Arrival Prediction Using Ensemble Modeling Based on Heliospheric Imaging Observations
Dumbović, Mateja; Möstl, Christian; Weiss, Andreas J. +8 more
In this study, we evaluate a coronal mass ejection (CME) arrival prediction tool that utilizes the wide-angle observations made by STEREO's heliospheric imagers (HI). The unsurpassable advantage of these imagers is the possibility to observe the evolution and propagation of a CME from close to the Sun out to 1 AU and beyond. We believe that by exp…
HD 143006: circumbinary planet or misaligned disc?
Pinte, C.; Ballabio, G.; Nealon, R. +3 more
Misalignments within protoplanetary discs are now commonly observed, and features such as shadows in scattered light images indicate departure from a co-planar geometry. VLT/SPHERE (Very Large Telescope/Spectro-Polarimetric High-contrast Exoplanet REsearch) observations of the disc around HD 143006 show a large-scale asymmetry and two narrow dark …
A strong lensing model of the galaxy cluster PSZ1 G311.65-18.48
Brammer, G.; Grillo, C.; Tozzi, P. +10 more
We present a strong lensing analysis of the galaxy cluster PSZ1 G311.65-18.48 (z = 0.443) using multi-band observations with Hubble Space Telescope complemented with VLT/MUSE spectroscopic data. The MUSE observations provide redshift estimates for the lensed sources and help to reduce misidentification of the multiple images. Spectroscopic data ar…
The unusual widespread solar energetic particle event on 2013 August 19. Solar origin and particle longitudinal distribution
Williams, D.; Jian, L. K.; Rodríguez-Pacheco, J. +11 more
Context. Late on 2013 August 19, STEREO-A, STEREO-B, MESSENGER, Mars Odyssey, and the L1 spacecraft, spanning a longitudinal range of 222° in the ecliptic plane, observed an energetic particle flux increase. The widespread solar energetic particle (SEP) event was associated with a coronal mass ejection (CME) that came from a region located near th…
Intense dB/dt Variations Driven by Near Earth Bursty Bulk Flows (BBFs): A Case Study
Dunlop, Malcolm W.; Wei, Dong; Yang, Junying +3 more
During geomagnetically disturbed times the surface geomagnetic field often changes abruptly, producing geomagnetically induced currents (GICs) in a number of ground based systems. There are, however, few studies reporting GIC effects which are driven directly by bursty bulk flows (BBFs) in the inner magnetosphere. In this study, we investigate the…
Characterizing the target selection pipeline for the Dark Energy Spectroscopic Instrument Bright Galaxy Survey
Baugh, Carlton M.; Myers, Adam D.; Moustakas, John +18 more
We present the steps taken to produce a reliable and complete input galaxy catalogue for the Dark Energy Spectroscopic Instrument (DESI) Bright Galaxy Survey (BGS) using the photometric Legacy Survey DR8 DECam. We analyse some of the main issues faced in the selection of targets for the DESI BGS, such as star-galaxy separation, contamination by fr…
New mass-loss rates of B supergiants from global wind models
Krtička, J.; Kubát, J.; Krtičková, I.
Massive stars lose a significant fraction of mass during their evolution. However, the corresponding mass-loss rates are rather uncertain, especially for evolved stars. To improve this, we calculated global line-driven wind models for Galactic B supergiants. Our models predict radial wind structure and particularly the mass-loss rates and terminal…
Are Massive Dense Clumps Truly Subvirial? A New Analysis Using Gould Belt Ammonia Data
Caselli, Paola; Di Francesco, James; Rosolowsky, Erik +22 more
Dynamical studies of dense structures within molecular clouds often conclude that the most massive clumps contain too little kinetic energy for virial equilibrium, unless they are magnetized to an unexpected degree. This raises questions about how such a state might arise, and how it might persist long enough to represent the population of massive…