Search Publications
Tracing the Mass Growth and Star Formation Rate Evolution of Massive Galaxies from z ~ 6 to z ~ 1 in the Hubble Ultra-Deep Field
Stiavelli, Massimo; Franx, Marijn; van Dokkum, Pieter +8 more
We present an analysis of an H 160-selected photometric catalog of galaxies in the Hubble Ultra-Deep Field, using imaging from the WFC3/IR camera on the Hubble Space Telescope in combination with archival ultraviolet, optical, and near-infrared imaging. Using these data, we measure the spectral energy distributions of ~1500 galaxies to …
ULASJ1234+0907: the reddest type 1 quasar at z = 2.5 revealed in the X-ray and far-infrared.
Fabian, A. C.; Banerji, M.; McMahon, R. G.
We present Herschel and XMM-Newton observations of ULASJ1234+0907 (z = 2.503), the reddest broad-line type 1 quasar currently known with (i - K)AB > 7.1. Herschel observations indicate that the quasar host is a hyperluminous infrared galaxy with a total infrared luminosity of log10(LIR/L⊙) = 13.90 ± 0…
SUZAKU Observation of the Black Hole Binary 4U 1630-47 in the Very High State
Done, Chris; Shirahata, Mai; Ueda, Yoshihiro +7 more
We report the results from an X-ray and near-infrared observation of the Galactic black hole binary 4U 1630-47 in the very high state (VHS), performed with Suzaku and the Infrared Survey Facility around the peak of the 2012 September-October outburst. The X-ray spectrum is approximated by a steep power law, with photon index of 3.2, identifying th…
The force-free configuration of flux ropes in geomagnetotail: Cluster observations
Rème, H.; Dunlop, M.; Liu, Z. X. +7 more
Unambiguous knowledge of magnetic field structure and the electric current distribution is critical for understanding the origin, evolution, and related dynamic properties of magnetic flux ropes (MFRs). In this paper, a survey of 13 MFRs in the Earth's magnetotail are conducted by Cluster multipoint analysis, so that their force-free feature, i.e.…
Plasma Flows in the Heliosheath along the Voyager 1 and 2 Trajectories due to Effects of the 11 yr Solar Cycle
Toth, G.; Richardson, J. D.; Opher, M. +2 more
We investigate the role of the 11 yr solar cycle variations in the solar wind (SW) parameters on the flows in the heliosheath using a new three-dimensional time-dependent model of the interaction between the SW and the interstellar medium. For boundary conditions in the model we use realistic time and the latitudinal dependence of the SW parameter…
The detached dust shells around the carbon AGB stars R Sculptoris and V644 Scorpii
Olofsson, G.; Maercker, M.; Leal-Ferreira, M. L. +2 more
Context. The morphology of the circumstellar envelopes (CSE) around asymptotic giant branch (AGB) stars gives information on the mass-loss process from the star, its evolution and wind, and on the effect of binary interaction. However, determining the distribution of dust in the circumstellar envelopes is difficult. Observations of polarised, dust…
Structure and Morphology of X-Ray-selected Active Galactic Nucleus Hosts at 1 < z < 3 in the CANDELS-COSMOS Field
Fang, Guanwen; Kong, Xu; Chen, Yang +4 more
We analyze morphologies of the host galaxies of 35 X-ray-selected active galactic nuclei (AGNs) at z ~ 2 in the Cosmic Evolution Survey field using Hubble Space Telescope/WFC3 imaging taken from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey. We build a control sample of 350 galaxies in total by selecting 10 non-active galaxies…
A Challenging Solar Eruptive Event of 18 November 2003 and the Causes of the 20 November Geomagnetic Superstorm. II. CMEs, Shock Waves, and Drifting Radio Bursts
Temmer, M.; Grechnev, V. V.; Fainshtein, V. G. +7 more
We continue our study (Grechnev et al., 2013, doi:10.1007/s11207-013-0316-6; Paper I) on the 18 November 2003 geoffective event. To understand possible impact on geospace of coronal transients observed on that day, we investigated their properties from solar near-surface manifestations in extreme ultraviolet, LASCO white-light images, and dynamic …
Constraints on the Binary Properties of Mid- to Late T Dwarfs from Hubble Space Telescope WFC3 Observations
Mora, A.; Martín, E. L.; Solano, E. +4 more
We used Hubble Space Telescope/Wide Field Camera 3 (WFC3) observations of a sample of 26 nearby (<=20 pc) mid- to late T dwarfs to search for cooler companions and measure the multiplicity statistics of brown dwarfs (BDs). Tightly separated companions were searched for using a double point-spread-function-fitting algorithm. We also compared our…
On the Progenitors of Local Group Novae. I. The M31 Catalog
Shafter, A. W.; Bode, M. F.; Darnley, M. J. +2 more
We report the results of a survey of M31 novae in quiescence. This is the first catalog of extragalactic systems in quiescence to be published, and contains data for 38 spectroscopically confirmed novae from 2006 to 2012. We used Liverpool Telescope images of each nova during eruption to define an accurate position for each system. These positions…