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Comet 67P/Churyumov-Gerasimenko preserved the pebbles that formed planetesimals
Rodriguez, J.; Colangeli, L.; Della Corte, V. +16 more
Solar system formation models predict that the building blocks of planetesimals were mm- to cm-sized pebbles, aggregates of ices and non-volatile materials, consistent with the compact particles ejected by comet 67P/Churyumov-Gerasimenko (67P hereafter) and detected by GIADA (Grain Impact Analyzer and Dust Accumulator) on-board the Rosetta spacecr…
Jellyfish: the origin and distribution of extreme ram-pressure stripping events in massive galaxy clusters
Ebeling, Harald; McPartland, Conor; Roediger, Elke +1 more
We investigate the observational signatures and physical origin of ram-pressure stripping (RPS) in 63 massive galaxy clusters at z = 0.3-0.7, based on images obtained with the Hubble Space Telescope. Using a training set of a dozen `jellyfish' galaxies identified earlier in the same imaging data, we define morphological criteria to select 211 addi…
A Keck Adaptive Optics Survey of a Representative Sample of Gravitationally Lensed Star-forming Galaxies: High Spatial Resolution Studies of Kinematics and Metallicity Gradients
Richard, Johan; Stark, Daniel P.; Ellis, Richard S. +4 more
We discuss spatially resolved emission line spectroscopy secured for a total sample of 15 gravitationally lensed star-forming galaxies at a mean redshift of z≃ 2 based on Keck laser-assisted adaptive optics observations undertaken with the recently improved OSIRIS integral field unit (IFU) spectrograph. By exploiting gravitationally lensed sources…
The Bursty Star Formation Histories of Low-mass Galaxies at 0.4 < z < 1 Revealed by Star Formation Rates Measured From Hβ and FUV
Barro, Guillermo; Pérez-González, Pablo G.; Bell, Eric F. +17 more
We investigate the burstiness of star formation histories (SFHs) of galaxies at 0.4 < z < 1 by using the ratio of star formation rates (SFRs) measured from Hβ and FUV (1500 Å) (Hβ-to-FUV ratio). Our sample contains 164 galaxies down to stellar mass (M *) of 108.5 M ⊙ in the CANDELS GOODS-N region, where Team …
Wolf-Rayet stars in the Small Magellanic Cloud. II. Analysis of the binaries
Sander, A.; Hamann, W. -R.; Oskinova, L. M. +7 more
Context. Massive Wolf-Rayet (WR) stars are evolved massive stars (MI ≳ 20 M⊙) characterized by strong mass-loss. Hypothetically, they can form either as single stars or as mass donors in close binaries. About 40% of all known WR stars are confirmed binaries, raising the question as to the impact of binarity on the WR populati…
Star Formation and AGN Activity in Galaxy Clusters from z=1-2: a Multi-Wavelength Analysis Featuring Herschel/PACS
Dey, Arjun; Cybulski, Ryan; Alberts, Stacey +11 more
We present a detailed, multi-wavelength study of star formation (SF) and active galactic nucleus (AGN) activity in 11 near-infrared (IR) selected, spectroscopically confirmed massive (≳1014 M ⊙) galaxy clusters at 1 < z < 1.75. Using new deep Herschel/PACS imaging, we characterize the optical to far-IR spectral energy d…
Characterizing filaments in regions of high-mass star formation: High-resolution submilimeter imaging of the massive star-forming complex NGC 6334 with ArTéMiS
Hill, T.; Rodriguez, L.; Roussel, H. +28 more
Context. Herschel observations of nearby molecular clouds suggest that interstellar filaments and prestellar cores represent two fundamental steps in the star formation process. The observations support a picture of low-mass star formation according to which filaments of ~0.1 pc width form first in the cold interstellar medium, probably as a resul…
The BOSS Emission-line Lens Survey. IV. Smooth Lens Models for the BELLS GALLERY Sample
Brownstein, Joel R.; Marques-Chaves, Rui; Oguri, Masamune +9 more
We present Hubble Space Telescope F606W-band imaging observations of 21 galaxy-Lyα emitter lens candidates in the Baryon Oscillation Spectroscopic Survey Emission-Line Lens Survey (BELLS) for the GALaxy-Lyα EmitteR sYstems (BELLS GALLERY) survey. Seventeen systems are confirmed to be definite lenses with unambiguous evidence of multiple imaging. T…
Search for astrophysical rotating Ellis wormholes with x-ray reflection spectroscopy
Bambi, Cosimo; Zhou, Menglei; Cardenas-Avendano, Alejandro +2 more
Recently, two of us have found numerically rotating Ellis wormholes as solutions of four-dimensional Einstein gravity coupled to a phantom field. In this paper, we investigate possible observational signatures to identify similar objects in the Universe. These symmetric wormholes have a mass and are compact, so they may look like black holes. We s…
The mass-sheet degeneracy and time-delay cosmography: analysis of the strong lens RXJ1131-1231
Amara, Adam; Refregier, Alexandre; Birrer, Simon
We present extended modelling of the strong lens system RXJ1131-1231 with archival data in two HST bands in combination with existing line-of-sight contribution and velocity dispersion estimates. Our focus is on source size and its influence on time-delay cosmography. We therefore examine the impact of mass-sheet degeneracy and especially the dege…