Search Publications
A stellar census in globular clusters with MUSE: The contribution of rotation to cluster dynamics studied with 200 000 stars
Dreizler, S.; Roth, M. M.; Kamann, S. +10 more
This is the first of a series of papers presenting the results from our survey of 25 Galactic globular clusters with the MUSE integral-field spectrograph. In combination with our dedicated algorithm for source deblending, MUSE provides unique multiplex capabilities in crowded stellar fields and allows us to acquire samples of up to 20 000 stars wi…
Simulations of the WFIRST Supernova Survey and Forecasts of Cosmological Constraints
Kirshner, R. P.; Rest, A.; Filippenko, A. V. +14 more
The Wide Field InfraRed Survey Telescope (WFIRST) was the highest-ranked large space-based mission of the 2010 New Worlds, New Horizons decadal survey. It is now a NASA mission in formulation with a planned launch in the mid 2020s. A primary mission objective is to precisely constrain the nature of dark energy through multiple probes, including Ty…
Turbulence in the TW Hya Disk
Hughes, A. Meredith; Wilner, David J.; Andrews, Sean M. +3 more
Turbulence is a fundamental parameter in models of grain growth during the early stages of planet formation. As such, observational constraints on its magnitude are crucial. Here we self-consistently analyze ALMA CO(2-1), SMA CO(3-2), and SMA CO(6-5) observations of the disk around TW Hya and find an upper limit on the turbulent broadening of <…
StarHorse: a Bayesian tool for determining stellar masses, ages, distances, and extinctions for field stars
da Costa, L. N.; Maia, M. A. G.; Anders, F. +12 more
Understanding the formation and evolution of our Galaxy requires accurate distances, ages, and chemistry for large populations of field stars. Here, we present several updates to our spectrophotometric distance code, which can now also be used to estimate ages, masses, and extinctions for individual stars. Given a set of measured spectrophotometri…
The DEIMOS 10K Spectroscopic Survey Catalog of the COSMOS Field
Salvato, M.; Nayyeri, H.; Hasinger, G. +14 more
We present a catalog of 10,718 objects in the COSMOS field, observed through multi-slit spectroscopy with the Deep Imaging Multi-Object Spectrograph (DEIMOS) on the Keck II telescope in the wavelength range ∼5500-9800 Å. The catalog contains 6617 objects with high-quality spectra (two or more spectral features), and 1798 objects with a single spec…
Measurements of the Temperature and E-mode Polarization of the CMB from 500 Square Degrees of SPTpol Data
Ade, P. A. R.; Chiang, H. C.; Bleem, L. E. +64 more
We present measurements of the E-mode polarization angular auto-power spectrum (EE) and temperature-E-mode cross-power spectrum (TE) of the cosmic microwave background (CMB) using 150 GHz data from three seasons of SPTpol observations. We report the power spectra over the spherical harmonic multipole range 50< {\ell }≤slant 8000 and detect nine…
LISA verification binaries with updated distances from Gaia Data Release 2
Rossi, E. M.; Groot, P. J.; Marsh, T. R. +6 more
Ultracompact binaries with orbital periods less than a few hours will dominate the gravitational wave signal in the mHz regime. Until recently, 10 systems were expected to have a predicted gravitational wave signal strong enough to be detectable by the Laser Interferometer Space Antenna (LISA), the so-called `verification binaries'. System paramet…
Evolution of the f σ8 tension with the Planck15 /Λ CDM determination and implications for modified gravity theories
Kazantzidis, Lavrentios; Perivolaropoulos, Leandros
We construct an updated extended compilation of distinct (but possibly correlated) f σ8(z ) redshift space distortion (RSD) data published between 2006 and 2018. It consists of 63 datapoints and is significantly larger than previously used similar data sets. After fiducial model correction we obtain the best fit Ω0 m-σ8<…
The Hubble Space Telescope UV legacy survey of galactic globular clusters - XVI. The helium abundance of multiple populations
Anderson, J.; Milone, A. P.; Cordoni, G. +16 more
Recent work, based on data from the Hubble Space Telescope (HST ) UV Legacy Survey of Galactic Globular Clusters (GCs), has revealed that all the analysed clusters host two groups of first- (1G) and second-generation (2G) stars. In most GCs, both 1G and 2G stars host substellar populations with different chemical composition. We compare multiwavel…
CMU DeepLens: deep learning for automatic image-based galaxy-galaxy strong lens finding
Mandelbaum, Rachel; Li, Nan; Collett, Thomas E. +5 more
Galaxy-scale strong gravitational lensing can not only provide a valuable probe of the dark matter distribution of massive galaxies, but also provide valuable cosmological constraints, either by studying the population of strong lenses or by measuring time delays in lensed quasars. Due to the rarity of galaxy-scale strongly lensed systems, fast an…