Search Publications
The Assembly of the Red Sequence at z ~ 1: The Color and Spectral Properties of Galaxies in the Cl1604 Supercluster
Surace, J. A.; Fassnacht, C. D.; Kocevski, D. D. +6 more
We investigate the properties of the 525 spectroscopically confirmed members of the Cl1604 supercluster at z ~ 0.9 as part of the Observations of Redshift Evolution in Large Scale Environments survey. In particular, we focus on the photometric, stellar mass, morphological, and spectral properties of the 305 member galaxies of the eight clusters an…
On the Role of Rotating Sunspots in the Activity of Solar Active Region NOAA 11158
Maurya, R. A.; Ambastha, A.; Vemareddy, P.
We study the role of rotating sunspots in relation to the evolution of various physical parameters characterizing the non-potentiality of the active region (AR) NOAA 11158 and its eruptive events using the magnetic field data from the Helioseismic and Magnetic Imager (HMI) and multi-wavelength observations from the Atmospheric Imaging Assembly (AI…
The Near-infrared Background Intensity and Anisotropies during the Epoch of Reionization
Gong, Yan; Cooray, Asantha; Smidt, Joseph +1 more
A fraction of the extragalactic near-infrared (near-IR) background light involves redshifted photons from the ultraviolet (UV) emission from galaxies present during reionization at redshifts above 6. The absolute intensity and the anisotropies of the near-IR background provide an observational probe of the first-light galaxies and their spatial di…
A 10 kpc Scale Seyfert Galaxy Outflow: HST/COS Observations of IRAS F22456-5125
Kriss, Gerard A.; Arav, Nahum; Edmonds, Doug +2 more
We present analysis of the UV spectrum of the low-z AGN IRAS F22456-5125 obtained with the Cosmic Origins Spectrograph on board the Hubble Space Telescope. The spectrum reveals six main kinematic components, spanning a range of velocities of up to 800 km s-1, which for the first time are observed in troughs associated with C II, C IV, N…
A Non-radial Eruption in a Quadrupolar Magnetic Configuration with a Coronal Null
Liu, Yang; Hayashi, Keiji; Sun, Xudong +2 more
We report one of the several homologous non-radial eruptions from NOAA active region (AR) 11158 that are strongly modulated by the local magnetic field as observed with the Solar Dynamic Observatory. A small bipole emerged in the sunspot complex and subsequently created a quadrupolar flux system. Nonlinear force-free field extrapolation from vecto…
CLASH: New Multiple Images Constraining the Inner Mass Profile of MACS J1206.2-0847
Infante, L.; Zheng, W.; Molino, A. +45 more
We present a strong-lensing analysis of the galaxy cluster MACS J1206.2-0847 (z = 0.44) using UV, Optical, and IR, HST/ACS/WFC3 data taken as part of the CLASH multi-cycle treasury program, with VLT/VIMOS spectroscopy for some of the multiply lensed arcs. The CLASH observations, combined with our mass model, allow us to identify 47 new multiply le…
The Nature of Extremely Red H - [4.5] > 4 Galaxies Revealed with SEDS and CANDELS
Dickinson, M.; Ferguson, H. C.; Giavalisco, M. +20 more
We have analyzed a sample of 25 extremely red H - [4.5] > 4 galaxies, selected using 4.5 µm data from the Spitzer SEDS survey and deep H-band data from the Hubble Space Telescope CANDELS survey, over ~180 arcmin2 of the UKIDSS Ultra-Deep Survey field. Our aim is to investigate the nature of this rare population of mid-infrared …
The Low-redshift Intergalactic Medium as Seen in Archival Legacy HST/STIS and FUSE Data
Shull, J. Michael; Danforth, Charles W.; Tilton, Evan M. +1 more
We present a comprehensive catalog of ultraviolet (HST/STIS and FUSE) absorbers in the low-redshift intergalactic medium (IGM) at z < 0.4. The catalog draws from much of the extensive literature on IGM absorption and reconciles discrepancies among several previous catalogs through a critical evaluation of all reported absorption features in lig…
Velocity Measurements for a Solar Active Region Fan Loop from Hinode/EIS Observations
Young, P. R.; Mason, H. E.; O'Dwyer, B.
The velocity pattern of a fan loop structure within a solar active region over the temperature range 0.15-1.5 MK is derived using data from the EUV Imaging Spectrometer (EIS) on board the Hinode satellite. The loop is aligned toward the observer's line of sight and shows downflows (redshifts) of around 15 km s-1 up to a temperature of 0…
The Nature and Nurture of Bars and Disks
Corsini, E. M.; Aguerri, J. A. L.; Sánchez-Janssen, R. +2 more
The effects that interactions produce on galaxy disks and how they modify the subsequent formation of bars need to be distinguished to fully understand the relationship between bars and environment. To this aim we derive the bar fraction in three different environments ranging from the field to Virgo and Coma Clusters, covering an unprecedentedly …