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MUSE-ALMA haloes V: physical properties and environment of z ≤ 1.4 H I quasar absorbers
Pettini, Max; York, Donald G.; Hamanowicz, Aleksandra +11 more
We present results of the MUSE-ALMA haloes, an ongoing study of the circumgalactic medium (CGM) of low-redshift galaxies (z ≤ 1.4), currently comprising 14 strong H I absorbers in 5 quasar fields. We detect 43 galaxies associated with absorbers down to star formation rate (SFR) limits of 0.01-0.1 M⊙ yr-1, found within impact …
Double dark matter vision: twice the number of compact-source lenses with narrow-line lensing and the WFC3 grism
Brammer, G.; Treu, T.; Fassnacht, C. D. +9 more
The magnifications of compact-source lenses are extremely sensitive to the presence of low-mass dark matter haloes along the entire sightline from the source to the observer. Traditionally, the study of dark matter structure in compact-source strong gravitational lenses has been limited to radio-loud systems, as the radio emission is extended and …
The Splash without a Merger
Debattista, Victor P.; Amarante, João A. S.; Beraldo e Silva, Leandro +1 more
The Milky Way's progenitor experienced several merger events that left their imprints on the stellar halo, including the Gaia-Sausage/Enceladus. Recently, it has been proposed that this event perturbed the proto-disk and gave rise to a metal-rich ([Fe/H] > -1), low angular momentum (Vφ < 100 km s-1) stellar population. …
Unveiling the β Pictoris system, coupling high contrast imaging, interferometric, and radial velocity data
Genzel, R.; Henning, T.; Meunier, N. +85 more
Context. The nearby and young β Pictoris system hosts a well resolved disk, a directly imaged massive giant planet orbiting at ≃9 au, as well as an inner planet orbiting at ≃2.7 au, which was recently detected through radial velocity (RV). As such, it offers several unique opportunities for detailed studies of planetary system formation and early …
Full 5D characterisation of the Sagittarius stream with Gaia DR2 RR Lyrae
Castro-Ginard, A.; Helmi, A.; Antoja, T. +4 more
Context. The Sagittarius (Sgr) stream is one of the best tools that we currently have to estimate the mass and shape of our Galaxy. However, assigning membership and obtaining the phase-space distribution of the stars that form the tails of the stream is quite challenging.
Aims: Our goal is to produce a catalogue of the RR Lyrae stars of Sgr …
Measuring bulk flows of the intracluster medium in the Perseus and Coma galaxy clusters using XMM-Newton
Fabian, A. C.; Pinto, C.; Eckert, D. +7 more
We demonstrate a novel technique for calibrating the energy scale of the EPIC-pn detector on XMM-Newton, which allows us to measure bulk flows in the intracluster medium (ICM) of the Perseus and Coma galaxy clusters. The procedure uses the fluorescent instrumental background lines present in all observations, in particular, Cu-Kα. By studying thei…
Mars' Ionopause: A Matter of Pressures
Holmstrom, Mats; Sánchez-Cano, Beatriz; Mayyasi, Majd +8 more
This study assesses under what circumstances the Martian ionopause is formed on the dayside, both in regions where there are strong crustal magnetic fields and areas where these fields are small (<30 nT). Multiple data sets from three MAVEN dayside deep dip campaigns are utilized between periapsis and 600-1,000 km, as well as solar wind observa…
Four Distinct Pathways to the Element Abundances in Solar Energetic Particles
Reames, Donald V.
Based upon recent evidence from abundance patterns of chemical elements in solar energetic particles (SEPs), and, ironically, the belated inclusion of H and He, we can distinguish four basic SEP populations: (1) SEP1—pure "impulsive" SEPs are produced by magnetic reconnection in solar jets showing steep power-law enhancements of 1 ≤Z ≤56 ions vers…
On the Origin and Evolution of the Material in 67P/Churyumov-Gerasimenko
Morbidelli, Alessandro; Snodgrass, Colin; Altwegg, Kathrin +5 more
Primitive objects like comets hold important information on the material that formed our solar system. Several comets have been visited by spacecraft and many more have been observed through Earth- and space-based telescopes. Still our understanding remains limited. Molecular abundances in comets have been shown to be similar to interstellar ices …
Central molecular zones in galaxies: 12CO-to-13CO ratios, carbon budget, and X factors
Israel, F. P.
We present ground-based measurements of 126 nearby galaxy centers in 12CO and 92 in 13CO in various low-J transitions. More than 60 galaxies were measured in at least four lines. The average relative intensities of the first four J 12CO transitions are 1.00:0.92:0.70:0.57. In the first three J transitions, the aver…