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Evolution in the Black Hole—Galaxy Scaling Relations and the Duty Cycle of Nuclear Activity in Star-forming Galaxies
Trump, Jonathan R.; Brandt, W. N.; Xue, Y. Q. +6 more
We measure the location and evolutionary vectors of 69 Herschel-detected broad-line active galactic nuclei (BLAGNs) in the {{M}BH}-{{M}*} plane. BLAGNs are selected from the COSMOS and CDF-S fields, and span the redshift range 0.2≤slant z\lt 2.1. Black hole masses are calculated using archival spectroscopy and single-epoch vi…
High-resolution imaging of the molecular outflows in two mergers: IRAS 17208-0014 and NGC 1614
Tacconi, L. J.; Hunt, L. K.; Colina, L. +11 more
Context. Galaxy evolution scenarios predict that the feedback of star formation and nuclear activity (AGN) can drive the transformation of gas-rich spiral mergers into (ultra) luminous infrared galaxies and, eventually, lead to the build-up of QSO/elliptical hosts.
Aims: We study the role that star formation and AGN feedback have in launching…
Statistical Evidence for Contributions of Flares and Coronal Mass Ejections to Major Solar Energetic Particle Events
Dudok de Wit, T.; Klein, K. -L.; Miteva, R. +2 more
Solar energetic particle (SEP) events are related to flares and coronal mass ejections (CMEs). This work is a new investigation of statistical relationships between SEP peak intensities - deka-MeV protons and near-relativistic electrons - and characteristic quantities of the associated solar activity. We consider the speed of the CME and quantitie…
Luminous and Dark Matter Profiles from Galaxies to Clusters: Bridging the Gap with Group-scale Lenses
Treu, Tommaso; Ellis, Richard S.; Newman, Andrew B.
Observations of strong gravitational lensing, stellar kinematics, and larger-scale tracers enable accurate measures of the distribution of dark matter (DM) and baryons in massive early-type galaxies (ETGs). While such techniques have been applied to galaxy-scale and cluster-scale lenses, the paucity of intermediate-mass systems with high-quality d…
Revisiting Ulysses Observations of Interstellar Helium
Wood, Brian E.; Müller, Hans-Reinhard; Witte, Manfred
We report the results of a comprehensive reanalysis of Ulysses observations of interstellar He atoms flowing through the solar system, the goal being to reassess the interstellar He flow vector and to search for evidence of variability in this vector. We find no evidence that the He beam seen by Ulysses changes at all from 1994-2007. The direction…
The Multiplicity of Massive Stars: a High Angular Resolution Survey With the Guidance Sensor
Maíz Apellániz, J.; Norris, R. P.; Gies, D. R. +11 more
We present the results of an all-sky survey made with the Fine Guidance Sensor on the Hubble Space Telescope to search for angularly resolved binary systems among massive stars. The sample of 224 stars is comprised mainly of Galactic O- and B-type stars and luminous blue variables, plus a few luminous stars in the Large Magellanic Cloud. The FGS T…
Hubble Frontier Fields: the geometry and dynamics of the massive galaxy cluster merger MACSJ0416.1-2403
Richard, Johan; Massey, Richard; Kneib, Jean-Paul +13 more
We use a joint optical/X-ray analysis to constrain the geometry and history of the ongoing merging event in the massive galaxy cluster MACSJ0416.1-2403 (z = 0.397). Our investigation of cluster substructure rests primarily on a combined strong- and weak-lensing mass reconstruction based on the deep, high-resolution images obtained for the Hubble F…
The bubble-like interior of the core-collapse supernova remnant Cassiopeia A
Milisavljevic, Dan; Fesen, Robert A.
The death of massive stars is believed to involve aspheric explosions initiated by the collapse of an iron core. The specifics of these catastrophic explosions remain uncertain, due partly to limited observational constraints on asymmetries deep inside the star. Here we present near-infrared observations of the young supernova remnant Cassiopeia A…
Seasonal variations in Titan's middle atmosphere during the northern spring derived from Cassini/CIRS observations
Bézard, Bruno; Vinatier, Sandrine; Achterberg, Richard K. +8 more
We analyzed spectra acquired at the limb of Titan in the 2006-2013 period by the Cassini/Composite Infrared Spectrometer (CIRS) in order to monitor the seasonal evolution of the thermal, gas composition and aerosol spatial distributions. We are primarily interested here in the seasonal changes after the northern spring equinox and interpret our re…
KMOS view of the Galactic centre. I. Young stars are centrally concentrated
Kuntschner, H.; Hilker, M.; Walcher, C. J. +7 more
Context. The Galactic centre hosts a crowded, dense nuclear star cluster with a half-light radius of 4 pc. Most of the stars in the Galactic centre are cool late-type stars, but there are also ≳100 hot early-type stars in the central parsec of the Milky Way. These stars are only 3-8 Myr old.
Aims: Our knowledge of the number and distribution …