Projects By Virginia Institute of Theoretical Astronomy:
A High Resolution Model of Interstellar Absorption
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
The main goal of high-resolution X-ray spectroscopy is to identify interesting lines and measure their properties. These lines can tell us the mass/radius relationship of neutron stars, and velocities ... A High Resolution Study of Intersteller Absorption
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
A High-Redshift Z(=0.95) Cluster Revealed by a First Bent-Double Radio Source
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
To complete the analysis and publication of this observation of a high redshift cluster associated with a FIRST bent-double radio source. Although we had proposed a 95 ksec observation, we were give 20 ... Abell 119: Cluster Mergers and the Origin of Narrow-Angle-Tall Radio Galaxies
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
Abell 119 has two parallel Narrow-Angle-Tail (NAT) radio galaxies projected near its center. Although the dynamic state of the cluster has been uncertain, our short Chandra image showed a central cold ... Abell 520: A Complex Merging Cluster with an Unusual Radio Halo
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
The cluster Abell 520 is undergoing significant dynamical evolution. Optical data reveal a number of condensations at z=0.199. X-rays show an outer elongation NE-SW and perpendicular elongation NW-SE ... Are the X-Ray Binaries in S0 Galaxies Different From Those in Ellipticals?
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
AS-VITA ABELL 2063: The Physics of Cooling Flow Clusters with Central Radio Sources
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
AS-VITA PKS B1400-33 and Abell S753: A Very Bright Radio Relic in a Poor Cluster
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
AS-VITA Searching for Millisecond Pulsars in Extremely Low-Mass WHite Dwarf Binaries
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
AS-VITA Supernova and Supernova Remnant Studies
Chevalier, Roger A. Sponsor: U.S. Nsf - Directorate Math. & Physical Sciences
AS-VITA XXM-Newton Observation of the NW Merger Shock and Radio Relic in Abell 3667
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
Chandra General Observer Program, Cycle 5
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
Chandra Observations of Galaxy Clusters with Large cD GalaxyPeculiar Velocities
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
Collaborative Research: The Young Remnants of Massive Star Supernovae
Chevalier, Roger A. Sponsor: U.S. Nsf - Directorate Math. & Physical Sciences
During their lifetimes, massive stars undergo mass loss during various evolutionary phases. When they finally end their lives as supernovae, the interaction depends on both the mass loss processes leading ... Deep Chandra and Hubble Observations in NGC4697, the Nearest Optically Luminous, X-ray Faint Elliptical Galaxy
Sarazin, Craig L. Sponsor: Space Telescope Science Institute
We propose 4 new Chandra observations of NGC4697, the nearest X-ray-faint, optically-bright elliptical, which was resolved into low mass X-ray binaries (LMXBs) in Cycle 1. We will detect LMXBs at least ... Development of a Next Generation Community Code for Astrophysical Gas Dynamics
Hawley, John F. Sponsor: University Of Maryland
Direct numerical simulations play a crucial role in the study of the structure and dynamics of the visible matter in a wide variety of astrophysical systems, from the formation of stars to accretion flows ... Dynamics and Chemistry of Star Formation in Magnetic Clouds
Li, Zhi-Yun. Sponsor: U.S. Nsf - Directorate Math. & Physical Sciences
The potentially critical role of magnetic fields in star formation has long been recognized, but remains hard to ascertain, because of the difficulty in directly measuring the field strength. This is ... ESO 137-001 in A3627:ISM Stripping and Intracluster X-Ray Binaries
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
Filamentary Radio Relics in Clusters of Galaxies: Radio Bubbles or Merger Shocks?
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
Generating a Homogeneous Library of Isolated Binary Galaxy Cluster Mergers-Application to Dark Energy Surveys
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
Complex structures in Chandra images of galaxy cluster mergers cannot be entirely analyzed by analytical arguments, and requires comparisons to numerical simulations. Yet, existing simulations in the ... Hard X-Ray Inverse Compton Emission & A Merger Shock
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
The NW radio relic in the cluster A3667 will be observed with HXD/PIN to detect and characterize the nonthermal Inverse Compton emission. This relic is the brightest cluster radio relic/halo known; ... Interpreting Ultraviolet Spectra of Stars & Galaxies from First Principles
O'Connell, Robert W. Sponsor: Astrophysical Advances
(1) He will collaborate with project P1 R. Peterson and Co-I R. Rood in planning any new observations which are necessary. The primary instrument for new observations is expected to be the Space Telescope ... ITR/AP Development of a Next Generation Community Code for Astrophysical Gas Dynamics
Hawley, John F. Sponsor: Princeton University
The University of Virginia is pleased to participate as a sub grantee in the project entitled, "Development of a Next Generation Community Code for Astrophysical Gas Dynamics" submitted to the NSF AST-ITR ... Low Mass X-Ray Binaries & Globular Clusters Education
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
For my thesis, I will be using two of NASA's premier satellites, the Chandra X-ray Observatory and the Hubble Space Telescope, to study low mass X-ray binaries (LMXBs) and globular clusters (GCs) in elliptical ... Low Mass X-ray Binaries & Globular Clusters in the Early-Type Galaxy NGC 4365
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
Low Mass X-ray Binaries & Globular Clusters in the EArly-Type Galaxy NGC 4365 (6620137)
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
Low Mass X-ray Binaries & Globular Clusters in Virgo & Non-Virgo Early-Type Galaxies
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
For my thesis, I will be using two of NASA's premier satellites, the Chandra X-ray Observatory and the Hubble Space Telescope, to study low mass X-ray binaries (LMXBs) and globular clusters (GCs) in elliptical ... Mass Constraints on High Redshift Clusters of Galaxies with XMM-Newton
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
By virtue of their immense size, galaxy clusters can provide important constraints on cosmological parameters. Two elements are crucial to this effort: a large sample of clusters covering a wide range ... Measuring Star Formation Rates in Clusters of Galaxies with GALEX
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
Recent UV and optical observations have revealed that a fairly high percentage of clusters of galaxies with short cooling times in the X-ray emitting gas (cooling flow clusters) show evidence for large ... Merger Shocks in Clusters of Galaxies
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
Major mergers of clusters of galaxies are the most energetic events in the present Universe. We propose Chandra observations of a merging cluster to detect shocks in the intracluster gas. We will use ... Models of Pulsar Wind Nebulae and Their Surroundings
Chevalier, Roger A. Sponsor: U.S. Nasa - Goddard
Observations with the Chandra X-ray Observatory have substantially increased the number of pulsars associated with wind nebulae and supernova remnants. The expansion of PWNe (pulsar wind nebulae) in various ... Nailing Down the Hard X-ray Inverse Compton Emission from the Radio Halo in the Coma Cluster
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
We will observe the central regions of the Coma cluster with the HXD/PIN to detect and characterize the nonthermal Inverse Compton (IC) emission from the radio halo. Coma has the best-studied and brightest ... NRAO, Poonam Chandra, Jansky Fellow
Chevalier, Roger A. Sponsor: U.S. National Radio Astronomy Observatory
Dr. Poonam Chandra is a Jansky Fellow funded by NRAO to carry out research in astronomy and astrophysics. The result should be broadly of interest to NRAO (i.e. have a relation to radio astronomy) ... Numerical Magnetohydrodynamic Studies of Black Hole Accretion Disk
Hawley, John F. Sponsor: U.S. Nasa - Goddard
Numerical Magnetohydrodynamic Studies of Black Hole Accretion Disks
Hawley, John F. Sponsor: U.S. Nasa - Goddard
Poonam Chandra, NRAO Jansky Fellow II
Chevalier, Roger A. Sponsor: U.S. National Radio Astronomy Observatory
Dr. Poonam Chandra is a Jansky Fellow funded by NRAO to carry out research in astronomy and astrophysics. The research should be broadly of interest to NRAO (i.e. have a relation to radio astronomy) and ... Poonam Chandra, NRAO Jansky Fellow III
Chevalier, Roger A. Sponsor: U.S. National Radio Astronomy Observatory
Probing the Complex Structure in the Core of Abell 2029
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
To complete the analysis of the new, long observation. Many of the results are from the analysis of the archive shorter observation.
On large scales, A2029 appears to be an exceptionally regular cluster. ... Probing the Galaxy-wide Globular Cluster-Low Mass X-ray Binary Connection in Early-type Galaxies
Sarazin, Craig L. Sponsor: Space Telescope Science Institute
Probing the Globular Cluster/Low Mass X-ray Binary Connection in Early-type Galaxies
Sarazin, Craig L. Sponsor: Space Telescope Science Institute
Prompt Chandra Observations of Nearby Supernovae
Chevalier, Roger A. Sponsor: Smithsonian Astrophysical Observatory
We propose to continue our studies of Type II and Type lb/c supernovae (SNe). Our work on SNe 1999em and 1998S has shown that Chandra observations can help determine the structures of the SN ejecta and ... Prompt Chandra Observations of Nearby Supernovae
Chevalier, Roger A. Sponsor: Smithsonian Astrophysical Observatory
Prompt Chandra Observations of Supernovae
Chevalier, Roger A. Sponsor: Smithsonian Astrophysical Observatory
We propose to continue our studies of Type II and Ib/c supernovae (SNe). Our work on five previous SNe has shown that Chandra spectra can reveal details of the star's pre-SN evolution and of the interaction ... Protostellar Disk Formation in Magnetic Clouds
Li, Zhi-Yun. Sponsor: U.S. Nasa - Goddard
We seek to understand the formation of protostellar disks in the present-day molecular clouds, which are believed to be significantly magnetized on both theoretical and observational grounds. Magnetic ... Pulsar Wind Nebulae & Compact Objects in Supernovae
Chevalier, Roger A. Sponsor: U.S. Nasa - Goddard
Radio Halos & Relics & Merger Shocks in Clusters of Galaxies
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
Radio halos and relics are important diagnostics for identifying clusters undergoing a major merger. We propose observations of 4 clusters in which we have recently found a halo or relic. They all show ... Resolving the Connection Between Globular Clusters and Low-Mass X-ray Binaries
Sarazin, Craig L. Sponsor: Space Telescope Science Institute
Resolving the X-ray Binary Population in Early-Type Galaxies
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
NGC 5866 is an X-ray faint SO galaxy. Previous X-ray observations with Chandra, such as our observation of NGC 4697, have shown that most of the X-ray emission in these galaxies comes from low mass X-ray ... Solving the Cooling Flow Mystery
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
Even after recent studies the amount of cooling material per year is quite large in many cooling flow clusters, implying high star formation rates. In our pilot UV imaging study of 9 cooling flow clusters ... Solving the Mystery of Short Hand Gamma Ray Bursts
Chevalier, Roger A. Sponsor: Space Telescope Science Institute
Seven years after the afterglow detections that revolutionized studies of the long-soft gamma-ray bursts, not even one afterglow of a short-hard GRB research. The forthcoming Swift satellite will report ... Starbursts & Supercavities in Clusters of Galaxies
O'Connell, Robert W. Sponsor: U.S. Nasa - Jet Propulsion Laboratory
Stellar Mass Loss Versus External Accretion in the X-ray Bright Elliptical NGC5813
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
Stellar Mass Loss Versus External Accretion in X-ray Bright Ellipticals
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
Observations of NGC 5846 and NGC 4649, two X-ray-bright elliptical galaxies with extended emission line filaments and dust, will be used to study the interaction between the hot, X-ray emitting gas and ... Stellar Mass Loss Versus External Accretion in X-ray Bright Ellipticals
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
Observations of NGC 5846 and NGC 4649, two X-ray-bright elliptical galaxies with extended emission line filaments and dust, will be used to study the interaction between the hot, X-ray emitting gas and ... Stellar Mass Loss Versus External Accretion in X-ray Bright Ellipticals
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
Stellar Wind Interactions Around Binary Stars: Models for Planetary Nebulae
Chevalier, Roger A. Sponsor: Space Telescope Science Institute
HST observations of proto-planetary nebulae and planetary nebulae suggest that bipolar structure in these objects is due to a fast collimated wind expanding in the more spherically symmetric slow wind ... Suzaku Snapshot Survey of High-Redshift Galaxy Clusters from the RCS Survey
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
We propose Suzaku observations of 10 galaxy clusters at redshifts of 0.6 to 0.95. Our targets represent the optically richest clusters at these redshifts from the 100 square degree RCS-1 survey. As ... The Complex Dynamics of the Termal & Nonthermal Intracluster Gas
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
We propose observations of two hybrid merging/cooling flow clusters, A115N/S, and A1664/3541 which have bimodal optical and X-ray distributions. Generally, mergers and cooling flows are anticorrelated; ... The Galactic Generation-X
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
We propose Chandra observations of 11 E+A galaxies from SDSS to detect X-ray emission from intermediate-mass X-ray binaries (IMXBs) and hot gas. E+As contain a young stellar population, but with no ... The Halo Structure of RCS2-2327.4-0204
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
We propose ACS, NICMOS, and Chandra observations of the extraordinary and newly discovered galaxy cluster: RCS2-2327.4-0204 at z=0.7. This cluster shows 3 or more arcs in ground-based imaging. The target ... The Hiflugcs Cluster Survey: A Cornerstone for Cosmology
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
The HIFLUGCS Cluster Survey: A Cornerstone for Cosmology
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
Chandra X-Ray Observatory Center [hereafter CXC] Awards are issued by the Smithsonian Astrophysical Observatory [hereafter SAO] for and on behalf of the National Aeronautics and Space Administration [hereafter ... The HIFLUGCS/Chandra Archive Cluster Survey: A Cornerstone for Cosmology
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
The Interaction Between Cluster Central Radio Sources and Cooling Flows
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
The Local Galaxy Cluster Mass Function of the Brightest Clusters in the Sky
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
Galaxy clusters have proven to be highly competitive and complementary cosmological probes. For the next major breakthrough more reliable mass estimates and, therefore, a better understanding of cluster ... The Local Galaxy Cluster Mass Function of the Brightest Clusters in the Sky-I
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
Galaxy clusters have proven to be highly competitive and complementary cosmological probes. For the next major breakthrough more reliable mass estimates and, therefore, a better understanding of cluster ... The Nature of the Intermediate-Luminosity X-ray Sources in Globular Clusters
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
We propose short observations of four globular clusters seen to contain relatively bright (L_X[0.5-7 keV]=5x1033 to 1035 ergs/s) low-luminosity X-ray sources of Einstein, ROSAT ... The Origin of the Disturbed Cool Core and Filamentary Radio Source in Abell 133
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
We will observe A133, a merging cluster with a cooling flow (CF) and a filamentary radio relic. Recently we observed this cluster with Chandra and found a complex central structure. There is an X-ray ... The Physics of Cooling Flow Clusters with Central Radio Sources
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
Central galaxies in rich clusters are the sites of cluster cooling flows, with large masses of gas cooling through part of the X-ray band. Many of these galaxies host powerful radio sources. These sources ... The Physics of Cooling Flow Clusters with Central Radio Sources
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
Central galaxies in rich clusters are the sites of cluster cooling flows, with large masses of gas cooling through part of the X-ray band. Many of these galaxies host powerful radio sources. These sources ... The Physics of Cooling Flow Clusters with Central Radio Sources
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
Central galaxies in rich clusters are the sites of cluster cooling flows, with large masses of gas cooling through part of the X-ray band. Many of these galaxies host powerful radio sources. These sources ... The X-Ray Emission from Type IB and IC Supernovae
Chevalier, Roger A. Sponsor: Smithsonian Astrophysical Observatory
The X-ray emission from Type Ib and Ic supernovae, whose progenitors are massive stars lacking a hydrogen envelope, probably involves the interaction of the supernova with a circumstellar wind. Plausible ... Three Dimensional Studies of the Interaction Between a Protostellar Disk & an Embedded Planet
Hawley, John F. Sponsor: U.S. Nasa - Goddard
One of the most important problems in planetary dynamics is unraveling the details of how an embedded mass interacts with an ambient gaseous disk. Although several key results have been elucidated, a ... Understanding Gas Interactions in Groups: NGC 1600
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
We propose XMM observations to study the nature of and interaction between interstellar medium and group gas in the elliptical galaxy/group NGC 1600. Temperature and abundance measurements will be ... Unveiling the Progenitors and Physics of Cosmic Explosions
Chevalier, Roger A. Sponsor: Space Telescope Science Institute
Using the Chandra Archive to Study Low Mass X-ray Binaries & Globular Clusters in Virgo & Non-Virgo Early-Type Galaxies
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
We have analyzed archival Chandra observations of early-type galaxies to detect their Low Mass X-ray Binaries (LMXBs). We determined the luminosities, luminosity function, spectral properties, X-ray colors, ... VSGC Aerospace Graduate Research Fellowship - D. Wik
Sarazin, Craig L. Sponsor: Virginia Space Grant Consortium
VSGC Aerospace Graduate Research Fellowship - D. Wik
Sarazin, Craig L. Sponsor: Virginia Space Grant Consortium
Observations of the SZ effect will soon detect thousands of galaxy clusters, which can then be used to estimate the amount of matter and dark energy in the universe. I have been working to determine ... What Bends the Lobes of WAT Radio Sources in Isolated Environments-Are they in Fossil Groups?
Sarazin, Craig L. Sponsor: Smithsonian Astrophysical Observatory
X-Ray Emissions From Filamentary Radio Relics & Mergers in Clusters of Galaxies
Sarazin, Craig L. Sponsor: U.S. Nasa - Goddard
We propose to observe the two Abell clusters of galaxies A13 and A4038 in which we have identified filamentary radio relic sources. Sensitive XMM-Newton EPIC observations will allow us to detect an excess ...
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