Search Publications
The Physical Conditions, Metallicity and Metal Abundance Ratios in a Highly Magnified Galaxy at z = 3.6252
Oguri, Masamune; Rigby, Jane R.; Florian, Michael +5 more
We present optical and near-IR imaging and spectroscopy of SGAS J105039.6+001730, a strongly lensed galaxy at z = 3.6252 magnified by >30×, and derive its physical properties. We measure a stellar mass of log(M */M ⊙) = 9.5 ± 0.35, star formation rates from [O II] λλ3727 and Hβ of 55 ± 25 and 84 ± 24 M ⊙ yr…
H2D+ observations give an age of at least one million years for a cloud core forming Sun-like stars
Caselli, Paola; Menten, Karl M.; Sipilä, Olli +8 more
The age of dense interstellar cloud cores, where stars and planets form, is a crucial parameter in star formation and difficult to measure. Some models predict rapid collapse, whereas others predict timescales of more than one million years (ref. 3). One possible approach to determining the age is through chemical changes as cloud contraction occu…
The HST/ACS Coma Cluster Survey - X. Nuclear star clusters in low-mass early-type galaxies: scaling relations
Ferguson, Henry C.; Balcells, Marc; Graham, Alister W. +16 more
We present scaling relations between structural properties of nuclear star clusters and their host galaxies for a sample of early-type dwarf galaxies observed as part of the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) Coma Cluster Survey. We have analysed the light profiles of 200 early-type dwarf galaxies in the magnitude range…
A Consistent Study of Metallicity Evolution at 0.8 < z < 2.6
van Dokkum, Pieter; Bender, Ralf; Tacchella, Sandro +33 more
We present the correlations between stellar mass, star formation rate (SFR), and the [N II]/Hα flux ratio as an indicator of gas-phase metallicity for a sample of 222 galaxies at 0.8 < z < 2.6 and log (M */M ⊙) = 9.0-11.5 from the LUCI, SINS/zC-SINF, and KMOS3D surveys. This sample provides a unique analysis …
Weak lensing analysis of SZ-selected clusters of galaxies from the SPT and Planck surveys
Gruen, D.; Bender, R.; Seitz, S. +8 more
We present the weak lensing analysis of the Wide-Field Imager Sunyaev-Zel'dovich Cluster of Galaxy (WISCy) sample, a set of 12 clusters of galaxies selected for their Sunyaev-Zel'dovich (SZ) effect. After developing new and improved methods for background selection and determination of geometric lensing scaling factors from absolute multiband phot…
A remarkable recurrent nova in M 31: The optical observations
Ness, J. -U.; Henze, M.; Shafter, A. W. +5 more
Context. In late Nov. 2013 the fifth eruption in five years of the M 31 recurrent nova M 31N 2008-12a was announced.
Aims: In this Letter we address the optical lightcurve and progenitor system of M 31N 2008-12a.
Methods: Optical imaging data of the 2013 eruption from the Liverpool Telescope, La Palma; Danish 1.54 m Telescope, La Silla; …
Evidence for a Weak Wind from the Young Sun
Redfield, Seth; Wood, Brian E.; Müller, Hans-Reinhard +1 more
The early history of the solar wind has remained largely a mystery due to the difficulty of detecting winds around young stars that can serve as analogs for the young Sun. Here we report on the detection of a wind from the 500 Myr old solar analog π1 UMa (G1.5 V), using spectroscopic observations from the Hubble Space Telescope. We dete…
The Properties of Low Redshift Intergalactic O VI Absorbers Determined from High S/N Observations of 14 QSOs with the Cosmic Origins Spectrograph
Savage, B. D.; Wakker, B. P.; Stocke, J. T. +4 more
We report on the observed properties of the plasma revealed through high signal-to-noise observations of 54 intervening O VI absorption systems containing 85 O VI and 133 H I components in a blind survey of 14 QSOs observed at ~18 km s-1 resolution with the Cosmic Origins Spectrograph over a redshift path of 3.52 at z < 0.5. Simple s…
Using the CMB angular power spectrum to study Dark Matter-photon interactions
Lesgourgues, Julien; Wilkinson, Ryan J.; Bœhm, C. {é. }line
In this paper, we explore the impact of Dark Matter-photon interactions on the CMB angular power spectrum. Using the one-year data release of the Planck satellite, we derive an upper bound on the Dark Matter-photon elastic scattering cross section of σDM-γ <= 8 × 10-31 (mDM/GeV) cm2 (68% CL) if the cr…
A Molecular Line Scan in the Hubble Deep Field North: Constraints on the CO Luminosity Function and the Cosmic H2 Density
Daddi, E.; Maiolino, R.; Menten, K. M. +19 more
We present direct constraints on the CO luminosity function at high redshift and the resulting cosmic evolution of the molecular gas density, \rho _H_2(z), based on a blind molecular line scan in the Hubble Deep Field North (HDF-N) using the IRAM Plateau de Bure Interferometer. Our line scan of the entire 3 mm window (79-115 GHz) covers a cosmic v…