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Probing dark matter substructure in the gravitational lens HE 0435-1223 with the WFC3 grism
Keeton, C. R.; Kochanek, C. S.; Brammer, G. +7 more
Strong gravitational lensing provides a powerful test of cold dark matter (CDM) as it enables the detection and mass measurement of low-mass haloes even if they do not contain baryons. Compact lensed sources such as active galactic nuclei (AGNs) are particularly sensitive to perturbing subhaloes, but their use as a test of CDM has been limited by …
ALMA Reveals Metals yet No Dust within Multiple Components in CR7
Schaerer, D.; Mobasher, B.; Ferrara, A. +8 more
We present spectroscopic follow-up observations of CR7 with ALMA, targeted at constraining the infrared (IR) continuum and [C II]{}158µ {{m}} line-emission at high spatial resolution matched to the HST/WFC3 imaging. CR7 is a luminous Lyα emitting galaxy at z = 6.6 that consists of three separated UV-continuum components. Our obser…
Bombs and Flares at the Surface and Lower Atmosphere of the Sun
Leenaarts, J.; Hansteen, V. H.; Rouppe van der Voort, L. +3 more
A spectacular manifestation of solar activity is the appearance of transient brightenings in the far wings of the Hα line, known as Ellerman bombs (EBs). Recent observations obtained by the Interface Region Imaging Spectrograph have revealed another type of plasma “bombs” (UV bursts) with high temperatures of perhaps up to 8 × 104 K wit…
Falling Outer Rotation Curves of Star-forming Galaxies at 0.6 ≲ z ≲ 2.6 Probed with KMOS3D and SINS/zC-SINF
Übler, Hannah; van Dokkum, Pieter G.; Brammer, Gabe +25 more
We exploit the deep, resolved, Hα kinematic data from the KMOS3D and SINS/zC-SINF surveys to examine the largely unexplored outer-disk kinematics of star-forming galaxies (SFGs), out to the peak of cosmic star formation. Our sample contains 101 SFGs, representative of the more massive (9.3≲ {log}{M}* /{M}⊙ ≲ 11.5) …
A Measurement of the Cosmic Microwave Background B-mode Polarization Power Spectrum at Subdegree Scales from Two Years of polarbear Data
Ade, P. A. R.; Baccigalupi, C.; Borrill, J. +79 more
We report an improved measurement of the cosmic microwave background B-mode polarization power spectrum with the Polarbear experiment at 150 GHz. By adding new data collected during the second season of observations (2013-2014) to re-analyzed data from the first season (2012-2013), we have reduced twofold the band-power uncertainties. The band pow…
A Close-up View of the Young Circumbinary Disk HD 142527
Ricci, L.; Boehler, Y.; Grady, C. +4 more
We present ALMA observations of the 0.88 millimeter dust continuum and the 13CO and C18O J = 3-2 line emission of the circumbinary disk HD 142527 at a spatial resolution of ∼0.″25. This system is characterized by a large central cavity of roughly 120 au in radius, and asymmetric dust and gas emission. By comparing the observa…
Warm inflation dissipative effects: Predictions and constraints from the Planck data
Benetti, Micol; Ramos, Rudnei O.
We explore the warm inflation scenario theoretical predictions looking at two different dissipative regimes for several representative primordial potentials. As it is well known, warm inflation is able to decrease the tensor-to-scalar ratio value, rehabilitating several primordial potentials ruled out in the cold inflation context by the recent co…
Characterizing the UV-to-NIR shape of the dust attenuation curve of IR luminous galaxies up to z ∼ 2
Buat, V.; Burgarella, D.; Efstathiou, A. +4 more
In this work, we investigate the far-ultraviolet (UV) to near-infrared (NIR) shape of the dust attenuation curve of a sample of IR-selected dust obscured (ultra)luminous IR galaxies at z ∼ 2. The spectral energy distributions (SEDs) are fitted with Code Investigating GALaxy Emission, a physically motivated spectral-synthesis model based on energy …
MOSFIRE Spectroscopy of Quiescent Galaxies at 1.5 < z < 2.5. I. Evolution of Structural and Dynamical Properties
Ellis, Richard S.; Belli, Sirio; Newman, Andrew B.
We present deep near-infrared spectra for a sample of 24 quiescent galaxies in the redshift range 1.5< z< 2.5 obtained with the MOSFIRE spectrograph at the W. M. Keck Observatory. In conjunction with a similar data set we obtained in the range 1< z< 1.5 with the LRIS spectrograph, we analyze the kinematic and structural properties for …
Wide binaries in Tycho-Gaia: search method and the distribution of orbital separations
Agüeros, Marcel A.; Andrews, Jeff J.; Chanamé, Julio
We mine the Tycho-Gaia astrometric solution (TGAS) catalogue for wide stellar binaries by matching positions, proper motions and astrometric parallaxes. We separate genuine binaries from unassociated stellar pairs through a Bayesian formulation that includes correlated uncertainties in the proper motions and parallaxes. Rather than relying on assu…