Search Publications
The 60 Month All-sky Burst Alert Telescope Survey of Active Galactic Nucleus and the Anisotropy of nearby AGNs
Greiner, J.; Alexander, D. M.; Ajello, M. +3 more
Surveys above 10 keV represent one of the best resources to provide an unbiased census of the population of active galactic nuclei (AGNs). We present the results of 60 months of observation of the hard X-ray sky with Swift/Burst Alert Telescope (BAT). In this time frame, BAT-detected (in the 15-55 keV band) 720 sources in an all-sky survey of whic…
LoCuSS: The Sunyaev-Zel'dovich Effect and Weak-lensing Mass Scaling Relation
Smith, Graham P.; Gralla, Megan; Mroczkowski, Tony +22 more
We present the first weak-lensing-based scaling relation between galaxy cluster mass, M WL, and integrated Compton parameter Y sph. Observations of 18 galaxy clusters at z ~= 0.2 were obtained with the Subaru 8.2 m telescope and the Sunyaev-Zel'dovich Array. The M WL-Y sph scaling relations, measured at …
A Hubble Space Telescope Survey of H2 Emission in the Circumstellar Environments of Young Stars
Herczeg, Gregory J.; Brown, Alexander; France, Kevin +8 more
The formation timescale and final architecture of exoplanetary systems are closely related to the properties of the molecular disks from which they form. Observations of the spatial distribution and lifetime of the molecular gas at planet-forming radii (a < 10 AU) are important for understanding the formation and evolution of exoplanetary syste…
The Red Supergiant Progenitor of Supernova 2012aw (PTF12bvh) in Messier 95
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Cenko, S. Bradley +9 more
We report on the direct detection and characterization of the probable red supergiant (RSG) progenitor of the intermediate-luminosity Type II-Plateau (II-P) supernova (SN) 2012aw in the nearby (10.0 Mpc) spiral galaxy Messier 95 (M95; NGC 3351). We have identified the star in both Hubble Space Telescope images of the host galaxy, obtained 17-18 yr…
A Disk-wind Model for the Near-infrared Excess Emission in Protostars
Bans, Alissa; Königl, Arieh
Protostellar systems, ranging from low-luminosity classical T Tauri and Herbig Ae stars to high-luminosity Herbig Be stars, exhibit a near-infrared (NIR) excess in their spectra that is dominated by a bump in the monochromatic luminosity with a peak near 3 µm. The bump can be approximated by a thermal emission component of temperature ~1500 …
Resolving the Far-IR Line Deficit: Photoelectric Heating and Far-IR Line Cooling in NGC 1097 and NGC 4559
Helou, G.; Roussel, H.; Murphy, E. J. +30 more
The physical state of interstellar gas and dust is dependent on the processes which heat and cool this medium. To probe heating and cooling of the interstellar medium over a large range of infrared surface brightness, on sub-kiloparsec scales, we employ line maps of [C II] 158 µm, [O I] 63 µm, and [N II] 122 µm in NGC 1097 and NG…
The Swift Burst Alert Telescope Detected Seyfert 1 Galaxies: X-Ray Broadband Properties and Warm Absorbers
Veilleux, Sylvain; Kallman, T. R.; McKernan, Barry +1 more
We present results from an analysis of the broadband, 0.3-195 keV, X-ray spectra of 48 Seyfert 1-1.5 sources detected in the very hard X-rays with the Swift Burst Alert Telescope (BAT). This sample is selected in an all-sky survey conducted in the 14-195 keV band. Therefore, our sources are largely unbiased toward both obscuration and host galaxy …
A HST/WFC3-IR Morphological Survey of Galaxies at z = 1.5-3.6. II. The Relation between Morphology and Gas-phase Kinematics
Erb, Dawn K.; Shapley, Alice E.; Steidel, Charles C. +3 more
We analyze rest-frame optical morphologies and gas-phase kinematics as traced by rest-frame far-UV and optical spectra for a sample of 204 star-forming galaxies in the redshift range z ~ 2-3 drawn from the Keck Baryonic Structure Survey. We find that spectroscopic properties and gas-phase kinematics are closely linked to morphology: compact galaxi…
Field Topology Analysis of a Long-lasting Coronal Sigmoid
van Ballegooijen, A. A.; DeLuca, E. E.; Savcheva, A. S.
We present the first field topology analysis based on nonlinear force-free field (NLFFF) models of a long-lasting coronal sigmoid observed in 2007 February with the X-Ray Telescope on Hinode. The NLFFF models are built with the flux rope insertion method and give the three-dimensional coronal magnetic field as constrained by observed coronal loop …
The Extended Hubble Space Telescope Supernova Survey: The Rate of Core Collapse Supernovae to z ~ 1
Mobasher, Bahram; Riess, Adam G.; Strolger, Louis-Gregory +3 more
We use a sample of 45 core collapse supernovae detected with the Advanced Camera for Surveys on board the Hubble Space Telescope to derive the core collapse supernova rate in the redshift range 0.1 < z < 1.3. In redshift bins centered on langzrang = 0.39, langzrang = 0.73, and langzrang = 1.11, we find rates of 3.00+1.28 - 0.…