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Herschel-ATLAS: properties of dusty massive galaxies at low and high redshifts
Smail, I.; Ivison, R. J.; Ibar, E. +16 more
We present a comparison of the physical properties of a rest-frame 250-µm-selected sample of massive, dusty galaxies from 0 < z < 5.3. Our sample comprises 29 high-redshift submillimetre galaxies (SMGs) from the literature and 843 dusty galaxies at z < 0.5 from the Herschel-Astrophysical TeraHertz Large Area Survey (H-ATLAS), select…
On the lack of X-ray bright Type IIP supernovae
Dwarkadas, V. V.
Type IIP supernovae (SNe) are expected to arise from red supergiant stars (RSGs). These stars have observed mass-loss rates that span more than two orders of magnitude, from less than 10^{-6} M_{⊙} yr-1 to almost 10^{-4} M_{⊙} yr-1. Thermal bremsstrahlung X-ray emission from at least some IIPs should reflect the larger end of…
Hubble Space Telescope and Ground-based Observations of the Type Iax Supernovae SN 2005hk and SN 2008A
Filippenko, Alexei V.; Schneider, Donald P.; Foley, Ryan J. +24 more
We present Hubble Space Telescope (HST) and ground-based optical and near-infrared observations of SN 2005hk and SN 2008A, typical members of the Type Iax class of supernovae (SNe). Here we focus on late-time observations, where these objects deviate most dramatically from all other SN types. Instead of the dominant nebular emission lines that are…
A search for flares and mass ejections on young late-type stars in the open cluster Blanco-1
Lammer, H.; Guenther, E. W.; Khodachenko, M. L. +5 more
We present a search for stellar activity (flares and mass ejections) in a sample of 28 stars in the young open cluster Blanco-1. We use optical spectra obtained with European Southern Observatory's Visible Multi-Object Spectrograph installed on the Very Large Telescope. From the total observing time of ∼5 h, we find four Hα flares but no distinct …
Extended [C II] Emission in Local Luminous Infrared Galaxies
Elbaz, D.; Veilleux, S.; Sanders, D. B. +20 more
We present Herschel/PACS observations of extended [C II] 157.7 µm line emission detected on ~1-10 kpc scales in 60 local luminous infrared galaxies (LIRGs) from the Great Observatories All-sky LIRG Survey. We find that most of the extra-nuclear emission show [C II]/FIR ratios >=4 × 10-3, larger than the mean ratio seen in the n…
Cosmological constraints on neutrinos after BICEP2
Zhang, Jing-Fei; Zhang, Xin; Li, Yun-He
Since the B-mode polarization of the cosmic microwave background (CMB) was detected by the BICEP2 experiment and an unexpectedly large tensor-to-scalar ratio,
Predicted Space Motions for Hypervelocity and Runaway Stars: Proper Motions and Radial Velocities for the Gaia Era
Geller, Margaret J.; Brown, Warren R.; Kenyon, Scott J. +1 more
We predict the distinctive three-dimensional space motions of hypervelocity stars (HVSs) and runaway stars moving in a realistic Galactic potential. For nearby stars with distances less than 10 kpc, unbound stars are rare; proper motions alone rarely isolate bound HVSs and runaways from indigenous halo stars. At large distances of 20-100 kpc, unbo…
The Knotted Sky II: does BICEP2 require a nontrivial primordial power spectrum?
Aslanyan, Grigor; Easther, Richard; Price, Layne C. +1 more
An inflationary gravitational wave background consistent with BICEP2 is difficult to reconcile with a simple power-law spectrum of primordial scalar perturbations. Tensor modes contribute to the temperature anisotropies at multipoles with l≲ 100, and this effect - together with a prior on the form of the scalar perturbations - was the source of pr…
Spatially resolved velocity maps of halo gas around two intermediate-redshift galaxies
Johnson, Sean D.; Chen, Hsiao-Wen; Gauthier, Jean-René +3 more
Absorption-line spectroscopy of multiply-lensed QSOs near a known foreground galaxy provides a unique opportunity to go beyond the traditional one-dimensional application of QSO probes and establish a crude three-dimensional map of halo gas around the galaxy that records the line-of-sight velocity field at different locations in the gaseous halo. …
Investigating Nearby Star-forming Galaxies in the Ultraviolet with HST/COS Spectroscopy. I. Spectral Analysis and Interstellar Abundance Determinations
Aloisi, A.; James, B. L.; Wolfe, M. A. +2 more
This is the first in a series of three papers describing a project with the Cosmic Origins Spectrograph on the Hubble Space Telescope to measure abundances of the neutral interstellar medium (ISM) in a sample of nine nearby star-forming galaxies. The goal is to assess the (in)homogeneities of the multiphase ISM in galaxies where the bulk of metals…