Search Publications
The Hubble Space Telescope Cluster Supernova Survey. II. The Type Ia Supernova Rate in High-redshift Galaxy Clusters
Gladders, M. D.; Panagia, N.; Huang, X. +41 more
We report a measurement of the Type Ia supernova (SN Ia) rate in galaxy clusters at 0.9 < z < 1.46 from the Hubble Space Telescope Cluster Supernova Survey. This is the first cluster SN Ia rate measurement with detected z > 0.9 SNe. Finding 8 ± 1 cluster SNe Ia, we determine an SN Ia rate of 0.50+0.23 -0.19 (stat)
Resolving the Galaxies within a Giant Lyα Nebula: Witnessing the Formation of a Galaxy Group?
Dey, Arjun; Jannuzi, Buell T.; Soifer, B. T. +8 more
Detailed analysis of the substructure of Lyα nebulae can put important constraints on the physical mechanisms at work and the properties of galaxies forming within them. Using high-resolution Hubble Space Telescope (HST) imaging of a Lyα nebula at z ≈ 2.656, we have taken a census of the compact galaxies in the vicinity, used optical/near-infrared…
Morphological Evolution of a Three-dimensional Coronal Mass Ejection Cloud Reconstructed from Three Viewpoints
Feng, L.; Inhester, B.; Wei, Y. +3 more
The propagation properties of coronal mass ejections (CMEs) are crucial to predict its geomagnetic effect. A newly developed three-dimensional (3D) mask fitting reconstruction method using coronagraph images from three viewpoints has been described and applied to the CME ejected on 2010 August 7. The CME's 3D localization, real shape, and morpholo…
On the Role of the Accretion Disk in Black Hole Disk-Jet Connections
Fabian, A. C.; Miller, J. M.; Nowak, M. A. +5 more
Models of jet production in black hole systems suggest that the properties of the accretion disk—such as its mass accretion rate, inner radius, and emergent magnetic field—should drive and modulate the production of relativistic jets. Stellar-mass black holes in the "low/hard" state are an excellent laboratory in which to study disk-jet connection…
Early-type Galaxies at z ~ 1.3. IV. Scaling Relations in Different Environments
Demarco, R.; Tanaka, M.; Rosati, P. +15 more
We present the Kormendy and mass-size relations (MSR) for early-type galaxies (ETGs) as a function of environment at z ~ 1.3. Our sample includes 76 visually classified ETGs with masses 1010 < M/M ⊙ < 1011.5, selected in the Lynx supercluster and in the Great Observatories Origins Deep Survey/Chandra Deep Fie…
A Herschel Survey of Cold Dust in Disks around Brown Dwarfs and Low-mass Stars
Pascucci, Ilaria; Henning, Thomas; Ménard, François +6 more
We report the complete photometric results from our Herschel study which is the first comprehensive program to search for far-infrared emission from cold dust around young brown dwarfs (BDs). We surveyed 50 fields containing 51 known or suspected BDs and very low mass stars that have evidence of circumstellar disks based on Spitzer photometry and/…
Luminous and High Stellar Mass Candidate Galaxies at z ≈ 8 Discovered in the Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey
Papovich, Casey; Finkelstein, Steven L.; Dickinson, Mark +26 more
One key goal of the Hubble Space Telescope Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey is to track galaxy evolution back to z ≈ 8. Its two-tiered "wide and deep" strategy bridges significant gaps in existing near-infrared surveys. Here we report on z ≈ 8 galaxy candidates selected as F105W-band dropouts in one of its deep fields…
The Unusual Temporal and Spectral Evolution of SN2011ht. II. Peculiar Type IIn or Impostor?
Humphreys, Roberta M.; Davidson, Kris; Pogge, R. W. +4 more
SN2011ht has been described both as a true supernova (SN) and as an impostor. In this paper, we conclude that it does not match some basic expectations for a core-collapse event. We discuss SN2011ht's spectral evolution from a hot dense wind to a cool dense wind, followed by the post-plateau appearance of a faster low density wind during a rapid d…
Luminous Satellites. II. Spatial Distribution, Luminosity Function, and Cosmic Evolution
Treu, T.; Auger, M. W.; Fassnacht, C. D. +3 more
We infer the normalization and the radial and angular distributions of the number density of satellites of massive galaxies (log10[M*h/M ⊙] > 10.5) between redshifts 0.1 and 0.8 as a function of host stellar mass, redshift, morphology, and satellite luminosity. Exploiting the depth and resolution of the COSMOS H…
The Relationship between the Sudden Change of the Lorentz Force and the Magnitude of Associated Flares
Liu, Chang; Wang, Haimin; Wang, Shuo
The rapid and irreversible change of photospheric magnetic fields associated with flares has been confirmed by many recent studies. These studies showed that the photospheric magnetic fields respond to coronal field restructuring and turn to a more horizontal state near the magnetic polarity inversion line (PIL) after eruptions. Recent theoretical…