Search Publications
Sympathetic Filament Eruptions from a Bipolar Helmet Streamer in the Sun
Yang, Bo; Yang, Jiayan; Bi, Yi +3 more
On 2005 August 5, two solar filaments erupted successively from different confined arcades underlying a common overarching multiple-arcade bipolar helmet streamer. We present detailed observations of these two events and identify them as sympathetic filament eruptions. The first (F1) is a small active-region filament located near the outskirts of …
Chandra and XMM-Newton Studies of the Supernova Remnant G292.2-0.5 Associated with the Pulsar J1119-6127
Safi-Harb, Samar; Gonzalez, Marjorie E.; Kumar, Harsha S.
We present the first detailed imaging and spatially resolved spectroscopic study of the Galactic supernova remnant (SNR) G292.2-0.5, associated with the high-magnetic field radio pulsar (PSR) J1119-6127, using Chandra and XMM-Newton. The high-resolution X-ray images reveal a partially limb-brightened morphology in the west, with diffuse emission c…
IDCS J1426.5+3508: Cosmological Implications of a Massive, Strong Lensing Cluster at z = 1.75
Dey, Arjun; Eisenhardt, Peter R. M.; Gonzalez, Anthony H. +6 more
The galaxy cluster IDCS J1426.5+3508 at z = 1.75 is the most massive galaxy cluster yet discovered at z > 1.4 and the first cluster at this epoch for which the Sunyaev-Zel'Dovich effect has been observed. In this paper, we report on the discovery with Hubble Space Telescope imaging of a giant arc associated with this cluster. The curvature of t…
A Candidate Active Galactic Nucleus with a Pure Soft Thermal X-Ray Spectrum
Ueda, Yoshihiro; Awaki, Hisamitsu; Terashima, Yuichi +2 more
We report the discovery of a candidate active galactic nucleus (AGN), 2XMM J123103.2+110648 at z = 0.13, with an X-ray spectrum represented purely by soft thermal emission reminiscent of Galactic black hole (BH) binaries in the disk-dominated state. This object was found in the second XMM-Newton serendipitous source catalog as a highly variable X-…
Evolution in the Continuum Morphological Properties of Lyα-emitting Galaxies from z = 3.1 to z = 2.1
Gronwall, Caryl; Gawiser, Eric; Ciardullo, Robin +4 more
We present a rest-frame ultraviolet morphological analysis of 108 z ~= 2.1 Lyα emitters (LAEs) in the Extended Chandra Deep Field South and compare it to a similar sample of 171 LAEs at z ~= 3.1. Using Hubble Space Telescope images from the Galaxy Evolution from Morphology and SEDs survey, Great Observatories Origins Deep Survey, and Hubble Ultrad…
Rest-frame UV-Optically Selected Galaxies at 2.3 <~ z <~ 3.5: Searching for Dusty Star-forming and Passively Evolving Galaxies
Dickinson, Mark; Ferguson, Henry C.; Fontana, Adriano +17 more
A new set of color selection criteria (VJL) analogous with the BzK method is designed to select both star-forming galaxies (SFGs) and passively evolving galaxies (PEGs) at 2.3 <~ z <~ 3.5 by using rest-frame UV-optical (V - J versus J - L) colors. The criteria are thoroughly tested with theoretical stellar population synthesis models and rea…
Magnification by Galaxy Group Dark Matter Halos
Leauthaud, Alexie; Rhodes, Jason; Capak, Peter +6 more
We report on the detection of gravitational lensing magnification by a population of galaxy groups, at a significance level of 4.9σ. Using X-ray-selected groups in the COSMOS 1.64 deg2 field, and high-redshift Lyman break galaxies as sources, we measure a lensing-induced angular cross-correlation between the samples. After satisfying co…
Shocks, Seyferts, and the Supernova Remnant Connection: A Chandra Observation of the Circinus Galaxy
Hardcastle, M. J.; Croston, J. H.; Kraft, R. P. +4 more
We analyze new Chandra observations of the nearest (D = 4 Mpc) Seyfert 2 active galaxy, Circinus, and match them to pre-existing radio, infrared, and optical data to study the kpc-scale emission. The proximity of Circinus allows us to observe in striking detail the structure of the radio lobes, revealing for the first time edge-brightened emission…
Infrared and Hard X-Ray Diagnostics of Active Galactic Nucleus Identification from the Swift/BAT and AKARI All-sky Surveys
Stawarz, Ł.; Gandhi, P.; Oyabu, S. +8 more
We combine data from two all-sky surveys in order to study the connection between the infrared and hard X-ray (>10 keV) properties for local active galactic nuclei (AGNs). The Swift Burst Alert Telescope all-sky survey provides an unbiased, flux-limited selection of hard X-ray-detected AGNs. Cross-correlating the 22 month hard X-ray survey with…
Chemical Analysis of a Diffuse Cloud along a Line of Sight toward W51: Molecular Fraction and Cosmic-Ray Ionization Rate
Menten, K. M.; Gerin, M.; Goicoechea, J. R. +4 more
Absorption lines from the molecules OH+, H2O+, and H+ 3 have been observed in a diffuse molecular cloud along a line of sight near W51 IRS2. We present the first chemical analysis that combines the information provided by all three of these species. Together, OH+ and H2O<…