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Section on Extragalactic Science Topics of the White Paper on the Status and Future of Ground-Based TeV Gamma-Ray Astronomy
H. Krawczynski, A. M. Atoyan, M. Beilicke +32
This is a report on the findings of the extragalactic science working group for the white paper on the status and future of TeV gamma-ray astronomy. The white paper was commissione…
Cosmic Evolution of Black Holes and Spheroids. III. The M-sigma relation in the last six billion years
J. -H. Woo, T. Treu, M. A. Malkan +1
We measure the evolution of the correlation between black hole mass and host spheroid velocity dispersion over the last 6 billion years, by studying three carefully selected sample…
A Statistical Description of AGN Jet Evolution from the VLBA Imaging and Polarimetry Survey (VIPS)
J. F. Helmboldt, G. B. Taylor, R. C. Walker +1
A detailed analysis of the evolution of the properties of core-jet systems within the VLBA Imaging and Polarimetry Survey (VIPS) is presented. We find a power-law relationship betw…
Hot self-similar relativistic MHD flows
Nadia L. Zakamska, Mitchell C. Begelman, Roger D. Blandford
We consider axisymmetric relativistic jets with a toroidal magnetic field and an ultrarelativistic equation of state, with the goal of studying the lateral structure of jets whose…
First-Year Spectroscopy for the SDSS-II Supernova Survey
Chen Zheng, Roger W. Romani, Masao Sako +77
This paper presents spectroscopy of supernovae discovered in the first season of the Sloan Digital Sky Survey-II Supernova Survey. This program searches for and measures multi-band…
Characteristics of EGRET Blazars in the VLBA Imaging and Polarimetry Survey (VIPS)
G. B. Taylor, S. E. Healey, J. F. Helmboldt +12
We examine the radio properties of EGRET-detected blazars observed as part of the VLBA Imaging and Polarimetry Survey (VIPS). VIPS has a flux limit roughly an order of magnitude be…
The VLBA Imaging and Polarimetry Survey at 5 GHz
J. F. Helmboldt, G. B. Taylor, S. Tremblay +13
We present the first results of the VLBA Imaging and Polarimetry Survey (VIPS), a 5 GHz VLBI survey of 1,127 sources with flat radio spectra. Through automated data reduction and i…
Probing Dark Energy via Weak Gravitational Lensing with the SuperNova Acceleration Probe (SNAP)
SNAP Collaboration
SNAP is a candidate for the Joint Dark Energy Mission (JDEM) that seeks to place constraints on the dark energy using two distinct methods. The first, Type Ia SN, is discussed in a…
The anatomy of a quadruply imaged gravitational lens system
S. H. Suyu, R. D. Blandford
The key to using a strong gravitational lens system to measure the Hubble constant is to obtain an accurate model of the lens potential. In this paper, we investigate the propertie…
The Fall 2004 SDSS Supernova Survey
Masao Sako, Roger Romani, Josh Frieman +38
In preparation for the Supernova Survey of the Sloan Digital Sky Survey (SDSS) II, a proposed 3-year extension to the SDSS, we have conducted an early engineering and science run d…
The relation between black hole mass and velocity dispersion at z~0.37
Tommaso Treu, Matthew Malkan, Roger Blandford
The velocity dispersion of 7 Seyfert 1 galaxies at z~0.37 is measured using high signal-to-noise Keck spectra. Black hole (BH) mass estimates are obtained via an empirically calibr…
Chandra Observations of the X-ray Environs of SN 1998bw/GRB 980425
C. Kouveliotou, S. E. Woosley, S. K. Patel +8
(Abrigded) We report X-ray studies of the environs of SN 1998bw and GRB 980425 using the Chandra X-Ray Observatory 1281 days after the GRB. Combining our observation of the superno…
Magneto-Centrifugal Launching of Jets from Accretion Disks. II: Inner Disk-Driven Winds
Ruben Krasnopolsky, Zhi-Yun Li, Roger D. Blandford
We follow numerically the time evolution of axisymmetric outflows driven magneto-centrifugally from the inner portion of accretion disks, from their launching surface to large, obs…
The Phenomena of High Energy Astrophysics
R. D. Blandford
A brief summary of some highlights in the study of high energy astrophysical sources over the past decade is presented. It is argued that the great progress that has been made deri…
Extrinsic Radio Variability of JVAS/CLASS Gravitational Lenses
L. V. E. Koopmans, A. Biggs, R. D. Blandford +6
We present flux-ratio curves of the fold and cusp (i.e. close multiple) images of six JVAS/CLASS gravitational lens systems. The data were obtained over a period of 8.5 months in 2…
The Cosmic Lens All-Sky Survey:II. Gravitational lens candidate selection and follow-up
I. W. A. Browne, P. N. Wilkinson, N. J. F. Jackson +19
We report the final results of the search for gravitationally lensed flat-spectrum radio sources found in the combination of CLASS (Cosmic Lens All Sky Survey) and JVAS (Jodrell-Ba…
The Cosmic Lens All-Sky Survey: I. Source selection and observations
S. T. Myers, N. J. Jackson, I. W. A. Browne +15
The Cosmic Lens All-Sky Survey (CLASS) is an international collaborative program which has obtained high-resolution radio images of over 10000 flat-spectrum radio sources in order…
Constraints on Cosmological Parameters from the Analysis of the Cosmic Lens All Sky Survey Radio-Selected Gravitational Lens Statistics
K. -H. Chae, A. D. Biggs, R. D. Blandford +20
We derive constraints on cosmological parameters and the properties of the lensing galaxies from gravitational lens statistics based on the final Cosmic Lens All Sky Survey (CLASS)…
Proposed Next Generation GRB Mission: EXIST
J. Grindlay, N. Gehrels, F. Harrison +7
A next generation Gamma Ray Burst (GRB) mission to follow the upcoming Swift mission is described. The proposed Energetic X-ray Imaging Survey Telescope, EXIST, would yield the lim…
To the Lighthouse
R. D. Blandford
The extreme hypothesis that essentially all types of ultrarelativistic outflow -- specifically AGN jets, pulsar wind nebulae and GRB --are electromagnetic, rather than gas dynamica…
White Dwarfs: Contributors and Tracers of the Galactic Dark-Matter Halo
L. V. E. Koopmans, R. D. Blandford
We examine the claim by Oppenheimer et al. (2001) that the local halo density of white dwarfs is an order of magnitude higher than previously thought. As it stands, the observation…
2016+112: A Gravitationally Lensed Type-II Quasar
L. V. E. Koopmans, M. A. Garrett, R. D. Blandford +3
A single-screen model of the gravitational lens system 2016+112 is proposed, that explains recent Hubble Space Telescope} (HST) infrared (NICMOS-F160W) observations and new high-re…
The new two-image gravitational lens system CLASS B2319+051
D. Rusin, D. R. Marlow, M. Norbury +10
We report the discovery of a new two-image gravitational lens system from the Cosmic Lens All-Sky Survey, CLASS B2319+051. Radio imaging with the Very Large Array (VLA) and Multi-E…
Radio Microlensing: Past, Present & Near Future
L. V. E. Koopmans, A. G. de Bruyn, C. D. Fassnacht +3
Strongly correlated non-intrinsic variability between 5 and 8.5 GHz has been observed in one of the lensed images of the gravitational lens B1600+434. These non-intrinsic (i.e. `ex…