Search Publications
Abundance and temperature distributions in the hot intra-cluster gas of Abell 4059
Zhang, Y. -Y.; Simionescu, A.; Kaastra, J. S. +5 more
Using the EPIC and RGS data from a deep (200 ks) XMM-Newton observation, we investigate the temperature structure (kT and σT) and the abundances of nine elements (O, Ne, Mg, Si, S, Ar, Ca, Fe, and Ni) of the intra-cluster medium (ICM) in the nearby (z = 0.046) cool-core galaxy cluster Abell 4059. Next to a deep analysis of the cluster c…
High-resolution Imaging of PHIBSS z ∼ 2 Main-sequence Galaxies in CO J = 1 → 0
Wuyts, S.; Förster Schreiber, N. M.; Genzel, R. +14 more
We present Karl Jansky Very Large Array observations of the CO J=1-0 transition in a sample of four z∼ 2 main-sequence galaxies. These galaxies are in the blue sequence of star-forming galaxies at their redshift, and are part of the IRAM Plateau de Bure HIgh-z Blue Sequence Survey which imaged them in CO J=3-2. Two galaxies are imaged here at high…
Constraints on the Initial-Final Mass Relation from Wide Double White Dwarfs
Anderson, Scott F.; Gianninas, A.; Kilic, Mukremin +3 more
We present observational constraints on the initial-final mass relation (IFMR) using wide double white dwarfs (DWDs). We identify 65 new candidate wide DWDs within the Sloan Digital Sky Survey, bringing the number of candidate wide DWDs to 142. We then engage in a spectroscopic follow-up campaign and collect existing spectra for these objects; usi…
The Relation between Luminous AGNs and Star Formation in Their Host Galaxies
Smith, G. P.; Egami, E.; Rieke, G. H. +3 more
We study the relation of active galactic nuclei (AGNs) to star formation in their host galaxies. Our sample includes 205 Type-1 and 85 Type-2 AGNs, 162 detected with Herschel, from fields surrounding 30 galaxy clusters in the Local Cluster Substructure Survey. The sample is identified by optical line widths and ratios after selection to be brighte…
Geoeffectiveness of Coronal Mass Ejections in the SOHO Era
Rodriguez, L.; Vršnak, B.; Veronig, A. +6 more
The main objective of the study is to determine the probability distributions of the geomagnetic Dst index as a function of the coronal mass ejection (CME) and solar flare parameters for the purpose of establishing a probabilistic forecast tool for the intensity of geomagnetic storms. We examined several CME and flare parameters as well as the eff…
Characteristics of Spiral Arms in Late-type Galaxies
Reid, M. J.; Honig, Z. N.
We have measured the positions of large numbers of H II regions in four nearly face-on, late-type, spiral galaxies: NGC 628 (M74), NGC 1232, NGC 3184, and NGC 5194 (M51). Fitting log-periodic spiral models to segments of each arm yields local estimates of spiral pitch angle and arm width. While pitch angles vary considerably along individual arms,…
Hubble Frontier Field free-form mass mapping of the massive multiple-merging cluster MACSJ0717.5+3745
Broadhurst, Tom; Zheng, Wei; Zitrin, Adi +4 more
We examine the latest data on the cluster MACSJ0717.5+3745 from the Hubble Frontier Fields campaign. The critically lensed area is the largest known of any lens and very irregular making it a challenge for parametric modelling. Using our free-form method we obtain an accurate solution, identify here many new sets of multiple images, doubling the n…
A WFC3 Grism Emission Line Redshift Catalog in the GOODS-South Field
Finkelstein, Steven L.; Barro, Guillermo; Ferguson, Henry C. +19 more
We combine Hubble Space Telescope (HST)/Wide Field Camera3 (WFC3) imaging and G141 grism observations from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) and 3D-HST surveys to produce a catalog of grism spectroscopic redshifts for galaxies in the CANDELS/GOODS-South field. The WFC3/G141 grism spectra cover a wavelengt…
A Radio Jet Drives a Molecular and Atomic Gas Outflow in Multiple Regions within One Square Kiloparsec of the Nucleus of the nearby Galaxy IC5063
Combes, F.; Dasyra, K. M.; Bostrom, A. C. +1 more
We analyzed near-infrared data of the nearby galaxy IC5063 taken with the Very Large Telescope SINFONI instrument. IC5063 is an elliptical galaxy that has a radio jet nearly aligned with the major axis of a gas disk in its center. The data reveal multiple signatures of molecular and atomic gas that has been kinematically distorted by the passage o…
Star-forming Blue ETGs in Two Newly Discovered Galaxy Overdensities in the HUDF at z=1.84 and 1.9: Unveiling the Progenitors of Passive ETGs in Cluster Cores
Papovich, Casey; Finkelstein, Steven L.; Castellano, Marco +15 more
We present the discovery of two galaxy overdensities in the Hubble Space Telescope UDF: a proto-cluster, HUDFJ0332.4-2746.6 at z=1.84+/- 0.01, and a group, HUDFJ0332.5-2747.3 at z=1.90 ± 0.01. Assuming viralization, the velocity dispersion of HUDFJ0332.4-2746.6 implies a mass of {{M}200}=(2.2+/- 1.8)× {{10}14} {{M}⊙