Search Publications
A volume-limited sample of X-ray galaxy groups and clusters - I. Radial entropy and cooling time profiles
Fabian, A. C.; Sanders, J. S.; Panagoulia, E. K.
We present the first results of our study of a sample of 101 X-ray galaxy groups and clusters, which is volume-limited in each of three X-ray luminosity bins. The aim of this work is to study the properties of the innermost ICM in the cores of our groups and clusters, and to determine the effect of non-gravitational processes, such as active galac…
The mass-metallicity-star formation rate relation at z ≳ 2 with 3D Hubble Space Telescope
Bowler, R. A. A.; Cullen, F.; McLure, R. J. +2 more
We present new accurate measurements of the mass, metallicity and star-formation rate of a statistically significant sample of 93 galaxies at z ≳ 2 using near-infrared spectroscopy taken as part of the 3D-Hubble Space Telescope survey. We derive a mass-metallicity relation (MZR) for our sample with metallicities based on the oxygen and Hβ nebular …
Thermal desorption of circumstellar and cometary ice analogs
Martín-Doménech, R.; Muñoz Caro, G. M.; Bueno, J. +1 more
Context. Thermal annealing of interstellar ices takes place in several stages of star formation. Knowledge of this process comes from a combination of astronomical observations and laboratory simulations under astrophysically relevant conditions.
Aims: For the first time we present the results of temperature programmed desorption (TPD) experi…
The NuSTAR View of Nearby Compton-thick Active Galactic Nuclei: The Cases of NGC 424, NGC 1320, and IC 2560
Harrison, F. A.; Stern, D.; Zhang, W. W. +25 more
We present X-ray spectral analyses for three Seyfert 2 active galactic nuclei (AGNs), NGC 424, NGC 1320, and IC 2560, observed by NuSTAR in the 3-79 keV band. The high quality hard X-ray spectra allow detailed modeling of the Compton reflection component for the first time in these sources. Using quasi-simultaneous NuSTAR and Swift/XRT data, as we…
zCOSMOS 20k: satellite galaxies are the main drivers of environmental effects in the galaxy population at least to z ∼ 0.7
Kneib, J. -P.; Aussel, H.; Le Floc'h, E. +41 more
We explore the role of environment in the evolution of galaxies over 0.1 < z < 0.7 using the final zCOSMOS-bright data set. Using the red fraction of galaxies as a proxy for the quenched population, we find that the fraction of red galaxies increases with the environmental overdensity δ and with the stellar mass M*, consistent wit…
Kelvin Helmholtz Instability in Planetary Magnetospheres
Wing, Simon; Delamere, Peter A.; Johnson, Jay R.
Kelvin-Helmholtz instability plays a particularly important role in plasma transport at magnetospheric boundaries because it can control the development of a turbulent boundary layer, which governs the transport of mass, momentum, and energy across the boundary. Waves generated at the interface can also couple into body modes in the plasma sheet a…
CARMA Large Area Star Formation Survey: Observational Analysis of Filaments in the Serpens South Molecular Cloud
Fernández-López, M.; Rosolowsky, E.; Shirley, Y. L. +15 more
We present the N2H+ (J = 1 → 0) map of the Serpens South molecular cloud obtained as part of the CARMA Large Area Star Formation Survey. The observations cover 250 arcmin2 and fully sample structures from 3000 AU to 3 pc with a velocity resolution of 0.16 km s-1, and they can be used to constrain the ori…
An Infrared-luminous Merger with Two Bipolar Molecular Outflows: ALMA and SMA Observations of NGC 3256
Aalto, Susanne; Sakamoto, Kazushi; Combes, Francoise +2 more
We report Atacama Large Millimeter/sub-millimeter Array and Submillimeter Array observations of the infrared-luminous merger NGC 3256, the most luminous galaxy within z = 0.01. Both of the two merger nuclei separated by 5'' (0.8 kpc) have a molecular gas concentration, a nuclear disk, with Σmol > 103 M ⊙ pc…
Accretion onto Planetary Mass Companions of Low-mass Young Stars
Herczeg, Gregory J.; Metchev, Stanimir; Zhou, Yifan +2 more
Measurements of accretion rates onto planetary mass objects may distinguish between different planet formation mechanisms, which predict different accretion histories. In this Letter, we use Hubble Space Telescope (HST)/WFC3 UVIS optical photometry to measure accretion rates onto three accreting objects, GSC 06214-00210 b, GQ Lup b, and DH Tau b, …
Turbulence Sets the Initial Conditions for Star Formation in High-pressure Environments
Testi, L.; Bastian, N.; Bally, J. +9 more
Despite the simplicity of theoretical models of supersonically turbulent, isothermal media, their predictions successfully match the observed gas structure and star formation activity within low-pressure (P/k < 105 K cm-3) molecular clouds in the solar neighborhood. However, it is unknown whether or not these theories exte…