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30 papers · 1 filter
Chandra Discovery of a Binary Active Galactic Nucleus in Mrk 739
Michael Koss, Richard Mushotzky, Ezequiel Treister +6
We have discovered a binary AGN in the galaxy Mrk 739 using Chandra and Swift BAT. We find two luminous L_2-10 keV=1.1*10^43 and 1.0*10^42 erg/s, unresolved nuclei with a projected…
Morphological evolution of galaxies from ultradeep HST WFC3 imaging: the Hubble sequence at z~2
Daniel Szomoru, Marijn Franx, Rychard J. Bouwens +4
We use ultradeep HST WFC3/IR imaging of the HUDF to investigate the rest-frame optical morphologies of a mass-selected sample of galaxies at z~2. We find a large variety of galaxy…
The stellar velocity dispersion of a compact massive galaxy at z=1.80 using X-Shooter: confirmation of the evolution in the mass-size and mass-dispersion relations
Jesse van de Sande, Mariska Kriek, Marijn Franx +7
Recent photometric studies have shown that early-type galaxies at fixed stellar mass were smaller and denser at earlier times. In this paper we assess that finding by deriving the…
South Pole Telescope Detections of the Previously Unconfirmed Planck Early SZ Clusters in the Southern Hemisphere
K. Story, K. A. Aird, K. Andersson +60
We present South Pole Telescope (SPT) observations of the five galaxy cluster candidates in the southern hemisphere which were reported as unconfirmed in the Planck Early Sunyaev-Z…
Hanny's Voorwerp: a nuclear starburst in IC2497
M. A. Garrett, H. Rampadarath, G. I. G. Jozsa +7
We present high and intermediate resolution radio observations of the central region in the spiral galaxy IC 2497, performed using the European VLBI Network (EVN) at 18 cm, and the…
Modeling the Outskirts of Galaxy Clusters with Cosmological Simulations
Daisuke Nagai
We present cosmological simulations of galaxy clusters, with focus on the cluster outskirts. We show that large-scale cosmic accretion and mergers produce significant internal gas…