Search Publications
The Lick AGN Monitoring Project: Recalibrating Single-epoch Virial Black Hole Mass Estimates
Treu, Tommaso; Filippenko, Alexei V.; Barth, Aaron J. +9 more
We investigate the calibration and uncertainties of black hole (BH) mass estimates based on the single-epoch (SE) method, using homogeneous and high-quality multi-epoch spectra obtained by the Lick Active Galactic Nucleus (AGN) Monitoring Project for nine local Seyfert 1 galaxies with BH masses <108 M ⊙. By decomposing the…
Shocking Tails in the Major Merger Abell 2744
Nulsen, Paul E. J.; Couch, Warrick J.; Owers, Matt S. +1 more
We identify four rare "jellyfish" galaxies in Hubble Space Telescope imagery of the major merger cluster Abell 2744. These galaxies harbor trails of star-forming knots and filaments which have formed in situ in gas tails stripped from the parent galaxies, indicating they are in the process of being transformed by the environment. Further evidence …
Spatially Resolved Hα Maps and Sizes of 57 Strongly Star-forming Galaxies at z ~ 1 from 3D-HST: Evidence for Rapid Inside-out Assembly of Disk Galaxies
Schmidt, Kasper B.; van Dokkum, Pieter G.; Franx, Marijn +13 more
We investigate the buildup of galaxies at z ~ 1 using maps of Hα and stellar continuum emission for a sample of 57 galaxies with rest-frame Hα equivalent widths >100 Å in the 3D-HST grism survey. We find that the Hα emission broadly follows the rest-frame R-band light but that it is typically somewhat more extended and clumpy. We quantify the s…
Precise Identifications of Submillimeter Galaxies: Measuring the History of Massive Star-forming Galaxies to z > 5
Wang, W. -H.; Owen, F. N.; Williams, J. P. +3 more
We carried out extremely sensitive Submillimeter Array (SMA) 340 GHz (860 µm) continuum imaging of a complete sample of SCUBA 850 µm sources (>4σ) with fluxes >3 mJy in the GOODS-N. Using these data and new SCUBA-2 data, we do not detect 4 of the 16 SCUBA sources, and we rule out the original SCUBA fluxes at the 4σ level. Three m…
Multi-point Shock and Flux Rope Analysis of Multiple Interplanetary Coronal Mass Ejections around 2010 August 1 in the Inner Heliosphere
Liu, Y.; Luhmann, J. G.; Webb, D. F. +20 more
We present multi-point in situ observations of a complex sequence of coronal mass ejections (CMEs) which may serve as a benchmark event for numerical and empirical space weather prediction models. On 2010 August 1, instruments on various space missions, Solar Dynamics Observatory/Solar and Heliospheric Observatory/Solar-TErrestrial-RElations-Obser…
Direct Imaging Confirmation and Characterization of a Dust-enshrouded Candidate Exoplanet Orbiting Fomalhaut
Burrows, Adam; Currie, Thayne; Fukagawa, Misato +6 more
We present Subaru/IRCS J-band data for Fomalhaut and a (re)reduction of archival 2004-2006 HST/ACS data first presented by Kalas et al. We confirm the existence of a candidate exoplanet, Fomalhaut b, in both the 2004 and 2006 F606W data sets at a high signal-to-noise ratio. Additionally, we confirm the detection at F814W and present a new detectio…
Expanded Search for z ~ 10 Galaxies from HUDF09, ERS, and CANDELS Data: Evidence for Accelerated Evolution at z > 8?
Trenti, M.; Oesch, P. A.; Carollo, C. M. +7 more
We search for z ~ 10 galaxies over ~160 arcmin2 of Wide-Field Camera 3 (WFC3)/IR data in the Chandra Deep Field South, using the public HUDF09, Early Release Science, and CANDELS surveys, that reach to 5σ depths ranging from 26.9 to 29.4 in H 160 AB mag. z >~ 9.5 galaxy candidates are identified via J 125 - H
An Integral Field Study of Abundance Gradients in nearby Luminous Infrared Galaxies
Rupke, D. S. N.; Kewley, L. J.; Dopita, M. A. +2 more
We present for the first time metallicity maps generated using data from the Wide Field Spectrograph on the ANU 2.3 m of 10 luminous infrared galaxies (LIRGs) and discuss the abundance gradients and distribution of metals in these systems. We have carried out optical integral field spectroscopy (IFS) of several LIRGs in various merger phases to in…
Quantitative Spectroscopy of Blue Supergiant Stars in the Disk of M81: Metallicity, Metallicity Gradient, and Distance
Bresolin, Fabio; Kudritzki, Rolf-Peter; Urbaneja, Miguel A. +4 more
The quantitative spectral analysis of low-resolution (~5 Å) Keck LRIS spectra of blue supergiants in the disk of the giant spiral galaxy M81 is used to determine stellar effective temperatures, gravities, metallicities, luminosities, interstellar reddening, and a new distance using the flux-weighted gravity-luminosity relationship. Substantial red…
Inverse Compton X-Ray Emission from Supernovae with Compact Progenitors: Application to SN2011fe
Hurley, K.; Costa, E.; Fransson, C. +39 more
We present a generalized analytic formalism for the inverse Compton X-ray emission from hydrogen-poor supernovae and apply this framework to SN 2011fe using Swift X-Ray Telescope (XRT), UVOT, and Chandra observations. We characterize the optical properties of SN 2011fe in the Swift bands and find them to be broadly consistent with a "normal" SN Ia…