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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…
RINGFINDER: Automated Detection of Galaxy-scale Gravitational Lenses in Ground-based Multi-filter Imaging Data
Treu, Tommaso; Gavazzi, Raphaël; Marshall, Philip J. +1 more
We present RINGFINDER, a tool for finding galaxy-scale strong gravitational lenses in multi-band imaging data. By construction, the method is sensitive to configurations involving a massive foreground ETG and a faint, background, blue source. RINGFINDER detects the presence of blue residuals embedded in an otherwise smooth red light distribution b…
An X-ray survey of the 2 Jy sample - I. Is there an accretion mode dichotomy in radio-loud AGN?
Hardcastle, M. J.; Croston, J. H.; Morganti, R. +4 more
We carry out a systematic study of the X-ray emission from the active nuclei of the 0.02 < z < 0.7 2 Jy sample, using Chandra and XMM-Newton observations. We combine our results with those from mid-infrared, optical emission-line and radio observations, and add them to those of the 3CRR sources. We show that the low-excitation objects in our…