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Seasonal variability of the hydrogen exosphere of Mars
Halekas, J. S.
The Mars Atmosphere and Volatile EvolutioN (MAVEN) mission measures both the upstream solar wind and collisional products from energetic neutral hydrogen atoms that precipitate into the upper atmosphere after their initial formation by charge exchange with exospheric hydrogen. By computing the ratio between the densities of these populations, we d…
BAT AGN Spectroscopic Survey (BASS) - VI. The ΓX-L/LEdd relation
Lamperti, Isabella; Schawinski, Kevin; Veilleux, Sylvain +11 more
We study the relation between accretion rate (in terms of L/LEdd) and shape of the hard X-ray spectral energy distribution (namely the photon index Γx) for a large sample of 228 hard X-ray-selected, low-redshift active galactic nuclei (AGNs), drawn from the Swift/BAT AGN Spectroscopic Survey (BASS). This includes 30 AGNs for …
The Fraction of Cool-core Clusters in X-Ray versus SZ Samples Using Chandra Observations
Lovisari, Lorenzo; Andrade-Santos, Felipe; Jones, Christine +21 more
We derive and compare the fractions of cool-core clusters in the Planck Early Sunyaev-Zel’dovich sample of 164 clusters with z≤slant 0.35 and in a flux-limited X-ray sample of 100 clusters with z≤slant 0.30, using Chandra observations. We use four metrics to identify cool-core clusters: (1) the concentration parameter, which is the ratio of the in…
The host galaxies and explosion sites of long-duration gamma ray bursts: Hubble Space Telescope near-infrared imaging
Lyman, J. D.; Bloom, J. S.; Angus, C. R. +10 more
We present the results of a Hubble Space Telescope WFC3/F160W Snapshot survey of the host galaxies of 39 long-duration gamma-ray bursts (LGRBs) at z < 3. We have non-detections of hosts at the locations of four bursts. Sufficient accuracy to astrometrically align optical afterglow images and determine the location of the LGRB within its host wa…
Dense Molecular Gas Tracers in the Outflow of the Starburst Galaxy NGC 253
Meier, David S.; Ott, Jürgen; Warren, Steven R. +12 more
We present a detailed study of a molecular outflow feature in the nearby starburst galaxy NGC 253 using ALMA. We find that this feature is clearly associated with the edge of NGC 253's prominent ionized outflow, has a projected length of ∼300 pc, with a width of ∼50 pc, and a velocity dispersion of ∼40 km s-1, which is consistent with a…
The AMBRE project: chemical evolution models for the Milky Way thick and thin discs
Recio-Blanco, A.; de Laverny, P.; Hayden, M. +5 more
We study the chemical evolution of the thick and thin discs of the Galaxy by comparing detailed chemical evolution models with recent data from the Archéologie avec Matisse Basée sur les aRchives de l'ESO project. The data suggest that the stars in the thick and thin discs form two distinct sequences with the thick disc stars showing higher [α/Fe]…
Neutrino lines from majoron dark matter
Garcia-Cely, Camilo; Heeck, Julian
Models with spontaneously broken global lepton number can lead to a pseudo-Goldstone boson as a long-lived dark matter candidate. Here we revisit the case of singlet majoron dark matter and discuss multiple constraints. For masses above MeV, this model could lead to a detectable flux of monochromatic mass-eigenstate neutrinos, which have flavor ra…
An ALMA Survey of DCN/H13CN and DCO+/H13CO+ in Protoplanetary Disks
Wilner, David J.; Aikawa, Yuri; Andrews, Sean M. +7 more
The deuterium enrichment of molecules is sensitive to their formation environment. Constraining patterns of deuterium chemistry in protoplanetary disks is therefore useful for probing how material is inherited or reprocessed throughout the stages of star and planet formation. We present ALMA observations at ∼0.″6 resolution of DCO+, H
X-ray and Ultraviolet Properties of AGNs in Nearby Dwarf Galaxies
Greene, Jenny E.; Baldassare, Vivienne F.; Reines, Amy E. +1 more
We present new Chandra X-ray Observatory and Hubble Space Telescope observations of eight optically selected broad-line active galactic nucleus (AGN) candidates in nearby dwarf galaxies (z < 0.055). Including archival Chandra observations of three additional sources, our sample contains all 10 galaxies from Reines et al. (2013) with both broad …
Lens modelling Abell 370: crowning the final frontier field with MUSE
Mahler, Guillaume; Richard, Johan; Schmidt, Kasper B. +8 more
We present a strong lensing analysis on the massive cluster Abell 370 (A370; z = 0.375), using a combination of deep multiband Hubble Space Telescope (HST) imaging and Multi-Unit Spectroscopic Explorer (MUSE) spectroscopy. From only 2 h of the MUSE data, we are able to measure 120 redshifts in the southern BCG area, including several multiply imag…