Search Publications
New Limits on an Intermediate-Mass Black Hole in Omega Centauri. II. Dynamical Models
Anderson, Jay; van der Marel, Roeland P.
We present a detailed dynamical analysis of the projected density and kinematical data available for the globular cluster ω Centauri. We solve the spherical anisotropic Jeans equation for a given density profile to predict the projected profiles of the rms velocity {\bar{σ}}(R), in each of the three orthogonal coordinate directions (line of sight,…
Three-Dimensional Integral Field Observations of 10 Galactic Winds. I. Extended Phase (gsim10 Myr) of Mass/Energy Injection Before the Wind Blows
Sharp, R. G.; Bland-Hawthorn, J.
In recent years, we have come to recognize the widespread importance of large-scale winds in the life cycle of galaxies. The onset and evolution of a galactic wind is a highly complex process which must be understood if we are to understand how energy and metals are recycled throughout the galaxy and beyond. Here we present three-dimensional spect…
A white dwarf cooling age of 8Gyr for NGC 6791 from physical separation processes
Salaris, Maurizio; Córsico, Alejandro H.; Althaus, Leandro G. +6 more
NGC 6791 is a well studied open cluster that it is so close to us that can be imaged down to very faint luminosities. The main-sequence turn-off age (~8Gyr) and the age derived from the termination of the white dwarf cooling sequence (~6Gyr) are very different. One possible explanation is that as white dwarfs cool, one of the ashes of helium burni…
Research Status Advantages and Disadvantages of China in Space Science Applications and Technology
Wu, J.; Guo, Huadong
Possible thermochemical disequilibrium in the atmosphere of the exoplanet GJ 436b
Deming, Drake; Madhusudhan, Nikku; Stevenson, Kevin B. +7 more
The nearby extrasolar planet GJ 436b-which has been labelled as a `hot Neptune'-reveals itself by the dimming of light as it crosses in front of and behind its parent star as seen from Earth. Respectively known as the primary transit and secondary eclipse, the former constrains the planet's radius and mass, and the latter constrains the planet's t…
The far-infrared/radio correlation as probed by Herschel
Berta, S.; Magnelli, B.; Nordon, R. +102 more
We set out to determine the ratio, qIR, of rest-frame 8-1000-µm flux, SIR, to monochromatic radio flux, S1.4 GHz, for galaxies selected at far-infrared (IR) and radio wavelengths, to search for signs that the ratio evolves with redshift, luminosity or dust temperature, Td, and to identify any far-I…
Improving Galactic Center Astrometry by Reducing the Effects of Geometric Distortion
Ghez, A. M.; Anderson, J.; Lu, J. R. +4 more
We present significantly improved proper motion measurements of the Milky Way's central stellar cluster. These improvements are made possible by refining our astrometric reference frame with a new geometric optical distortion model for the W. M. Keck II 10 m telescope's adaptive optics camera (NIRC2) in its narrow field mode. For the first time, t…
Reversal of Fortune: Confirmation of an Increasing Star Formation-Density Relation in a Cluster at z = 1.62
Papovich, Casey; Finkelstein, Steven L.; Saintonge, Amélie +9 more
We measure the rest-frame colors (dust-corrected), infrared luminosities, star formation rates, and stellar masses of 92 galaxies in a Spitzer-selected cluster at z = 1.62. By fitting spectral energy distributions (SEDs) to 10-band photometry (0.4 µm<λobs < 8 µm) and measuring 24 µm fluxes for the 12 spectroscopi…
Dark Matter Contraction and the Stellar Content of Massive Early-type Galaxies: Disfavoring "Light" Initial Mass Functions
Treu, T.; Auger, M. W.; Gavazzi, R. +3 more
We use stellar dynamics, strong lensing, stellar population synthesis models, and weak lensing shear measurements to constrain the dark matter (DM) profile and stellar mass in a sample of 53 massive early-type galaxies. We explore three DM halo models (unperturbed Navarro, Frenk, and White (NFW) halos and the adiabatic contraction models of Blumen…
Initial highlights of the HOBYS key program, the Herschel imaging survey of OB young stellar objects
Aussel, H.; Olofsson, G.; Abergel, A. +46 more
We present the initial highlights of the HOBYS key program, which are based on Herschel images of the Rosette molecular complex and maps of the RCW120 H ii region. Using both SPIRE at 250/350/500 µm and PACS at 70/160 µm or 100/160 µm, the HOBYS survey provides an unbiased and complete census of intermediate- to high-mass young s…