Search Publications
HST Grism Confirmation of Two z ∼ 2 Structures from the Clusters around Radio-loud AGN (CARLA) Survey
Noirot, Gaël; Gonzalez, Anthony H.; Stern, Daniel +10 more
Using Hubble Space Telescope slitless grism data, we report the spectroscopic confirmation of two distant structures at z∼ 2 associated with powerful high-redshift radio-loud active galactic nuclei (AGNs). These rich structures, likely (forming) clusters, are among the most distant structures currently known, and were identified on the basis of Sp…
The first observation of an intermediate flare from SGR 1935+2154
Hurley, K.; Zhang, X. -L.; Israel, G. L. +8 more
We report on the bright burst detected by four Interplanetary network (IPN) spacecraft on 2015 April 12. The IPN localization of the source is consistent with the position of the recently discovered soft gamma-repeater SGR 1935+2154. From the Konus-Wind (KW) observation, we derive temporal and spectral parameters of the emission, and the burst ene…
Inflation in the closed FLRW model and the CMB
Bonga, Béatrice; Gupt, Brajesh; Yokomizo, Nelson
Recent cosmic microwave background (CMB) observations put strong constraints on the spatial curvature via estimation of the parameter Ωk assuming an almost scale invariant primordial power spectrum. We study the evolution of the background geometry and gauge-invariant scalar perturbations in an inflationary closed FLRW model and calcula…
Submillimeter Polarization Spectrum in the Vela C Molecular Cloud
Ward-Thompson, Derek; Fissel, Laura M.; Nakamura, Fumitaka +27 more
Polarization maps of the Vela C molecular cloud were obtained at 250, 350, and 500 µm during the 2012 flight of the balloon-borne telescope BLASTPol. These measurements are used in conjunction with 850 µm data from Planck to study the submillimeter spectrum of the polarization fraction for this cloud. The spectrum is relatively flat an…
X-ray and radio emission from the luminous supernova 2005kd
Bauer, F. E.; Dwarkadas, V. V.; Romero-Cañizales, C. +1 more
SN 2005kd is among the most luminous supernovae (SNe) to be discovered at X-ray wavelengths. We have re-analysed all good angular resolution (better than 20 arcsec full width at half-maximum point spread function) archival X-ray data for SN 2005kd. The data reveal an X-ray light curve that decreases as t-1.62±0.06. Our modelling of the …
CFHTLenS and RCSLenS cross-correlation with Planck lensing detected in fourier and configuration space
Heymans, Catherine; Moutard, Thibaud; Harnois-Déraps, Joachim +13 more
We measure the cross-correlation signature between the Planck cosmic microwave background (CMB) lensing map and the weak lensing observations from both the Red-sequence Cluster Lensing Survey and the Canada-France-Hawaii Telescope Lensing Survey. In addition to a Fourier analysis, we include the first configuration-space detection, based on the es…
The Possible Detection of a Binary Companion to a Type Ibn Supernova Progenitor
Maund, J. R.; Mattila, S.; Pastorello, A. +2 more
We present late-time observations of the site of the Type Ibn supernova (SN) 2006jc, acquired with the Hubble Space Telescope Advanced Camera for Surveys. A faint blue source is recovered at the SN position, with brightness {m}F435W=26.76+/- 0.20, {m}F555W=26.60+/- 0.23 and {m}F625W=26.32+/- 0.19 mag, although ther…
The Nature and Frequency of the Gas Outbursts in Comet 67P/Churyumov-Gerasimenko Observed by the Alice Far-ultraviolet Spectrograph on Rosetta
Parker, Joel Wm.; Bertaux, Jean-Loup; Stern, S. Alan +7 more
Alice is a far-ultraviolet imaging spectrograph on board Rosetta that, among multiple objectives, is designed to observe emissions from various atomic and molecular species from within the coma of comet 67P/Churyumov-Gerasimenko. The initial observations, made following orbit insertion in 2014 August, showed emissions of atomic hydrogen and oxygen…
Discovery of Broad Soft X-ray Absorption Lines from the Quasar Wind in PDS 456
Behar, E.; Turner, T. J.; Tombesi, F. +5 more
High-resolution soft X-ray spectroscopy of the prototype accretion disk wind quasar, PDS 456, is presented. Here, the XMM-Newton reflection grating spectrometer spectra are analyzed from the large 2013-2014 XMM-Newton campaign, consisting of five observations of approximately 100 ks in length. During the last observation (OBS. E), the quasar is at…
The cause of spatial structure in solar He I 1083 nm multiplet images
Joshi, Jayant; Carlsson, Mats; Leenaarts, Jorrit +2 more
Context. The He I 1083 nm is a powerful diagnostic for inferring properties of the upper solar chromosphere, in particular for the magnetic field. The basic formation of the line in one-dimensional models is well understood, but the influence of the complex three-dimensional structure of the chromosphere and corona has however never been investiga…