Search Publications
Submillimeter Array Imaging of the CO(3-2) Line and 860 µm Continuum of Arp 220: Tracing the Spatial Distribution of Luminosity
Wilner, David J.; Zhang, Qizhou; Wang, Junzhi +6 more
We used the Submillimeter Array (SMA) to image 860 µm continuum and CO(3-2) line emission in the ultraluminous merging galaxy Arp 220, achieving a resolution of 0.23'' (80 pc) for the continuum and 0.33'' (120 pc) for the line. The CO emission peaks around the two merger nuclei with a velocity signature of gas rotation …
Separating Baryons and Dark Matter in Cluster Cores: A Full Two-dimensional Lensing and Dynamic Analysis of Abell 383 and MS 2137-23
Smith, Graham P.; Treu, Tommaso; Ellis, Richard S. +2 more
We utilize existing data for the galaxy clusters MS 2137-23 and Abell 383 to present improved measures of the distribution of dark and baryonic material in the clusters' central regions. Our method, based on the combination of gravitational lensing and dynamical data, is uniquely capable of separating the distribution of dark and baryonic componen…
Spatially Resolved Properties of the GRB 060505 Host: Implications for the Nature of the Progenitor
Fruchter, Andrew S.; Östlin, Göran; Hjorth, Jens +12 more
GRB 060505 was the first well-observed nearby possible long-duration gamma-ray burst (GRB) that had no associated supernova. Here we present spatially resolved spectra of the host galaxy of GRB 060505, an Sbc spiral, at redshift z = 0.0889. The GRB occurred inside a star-forming region in the northern spiral arm at 6.5 kpc from the center. From th…
Resonant Cyclotron Scattering in Magnetars' Emission
Götz, D.; Rea, N.; Lyutikov, M. +2 more
We present a systematic fit of a model of resonant cyclotron scattering (RCS) to the X-ray data of 10 magnetars, including canonical and transient anomalous X-ray pulsars (AXPs) and soft gamma repeaters (SGRs). In this scenario, nonthermal magnetar spectra in the soft X-rays (i.e., below ~10 keV) result from resonant cyclotron scattering of the th…
Modeling Fe II Emission and Revised Fe II (UV) Empirical Templates for the Seyfert 1 Galaxy I Zw 1
Bruhweiler, F.; Verner, E.
We use the narrow-lined broad-line region (BLR) of the Seyfert 1 galaxy, I Zw 1, as a laboratory for modeling the ultraviolet (UV) Fe II 2100-3050 Å emission complex. We calculate a grid of Fe II emission spectra representative of BLR clouds and compare them with the observed I Zw 1 spectrum. Our predicted spectrum for log [nH/(cm …
The Detailed Evolution of E+A Galaxies into Early Types
Zabludoff, Ann I.; Zaritsky, Dennis; Yang, Yujin +1 more
Poststarburst, or E+A, galaxies are the best candidates for galaxies in transition from being gas-rich and star-forming to gas-poor and passively evolving as a result of galaxy-galaxy interactions. To focus on what E+A galaxies become after their young stellar populations fade away, we present the detailed morphologies of 21 E+A galaxies using hig…
Spectroscopic Confirmation of an Extreme Starburst at Redshift 4.547
Aussel, H.; Sanders, D. B.; Ilbert, O. +22 more
We report the spectroscopic confirmation of a submillimeter galaxy (SMG) at z = 4.547 with an estimated LIR = (0.5-2.0) × 1013 L⊙. The spectra, mid-IR, and X-ray properties indicate the bolometric luminosity is dominated by star formation at a rate of >1000 M⊙ yr-1. Multiple, spatially sepa…
Lyman Break Galaxies, Lyα Emitters, and a Radio Galaxy in a Protocluster at z = 4.1
Ford, H. C.; Demarco, R.; Zheng, W. +17 more
We present deep HST ACS observations in g475r625i775z850 toward the z = 4.1 radio galaxy TN J1338-1942 and its overdensity of >30 spectroscopically confirmed Lyα emitters (LAEs). We select 66 g475 band dropouts to z850,5 σ = 27, 6 of which are also LAEs. Although our color-color …
Exoplanet HD 209458b (Osiris): Evaporation Strengthened
Lecavelier des Etangs, A.; Ferlet, R.; Vidal-Madjar, A. +4 more
Following reanalysis of Hubble Space Telescope observations of primary transits of the extrasolar planet HD 209458b at Lyα, Ben-Jaffel claims that no sign of evaporation is observed. Here we show that, in fact, this new analysis is consistent with the one of Vidal-Madjar and coworkers, and supports the detection of evaporation. The apparent disagr…
A Global Kinetic Model for Cometary Comae: The Evolution of the Coma of the Rosetta Target Comet Churyumov-Gerasimenko throughout the Mission
Tenishev, Valeriy; Combi, Michael; Davidsson, Björn
The Rosetta spacecraft is en route to comet 67P/Churyumov-Gerasimenko for a rendezvous, landing, and extensive orbital phase beginning in 2014. Model studies of the coma will be required not only for planning of the mission and interpretation of spacecraft data, but also for an expectedly large amount of complementary remote observational data tha…