A5070429657- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Astrophysical Phenomena and Observations
- Spacecraft and Cryogenic Technologies
- Radio Astronomy Observations and Technology
- Planetary Science and Exploration
- CCD and CMOS Imaging Sensors
- Calibration and Measurement Techniques
- History and Developments in Astronomy
- Geophysics and Gravity Measurements
- Scientific Research and Discoveries
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Spacecraft Design and Technology
- Photocathodes and Microchannel Plates
- Impact of Light on Environment and Health
- Solar and Space Plasma Dynamics
- Spectroscopy and Laser Applications
- Space Satellite Systems and Control
California Institute of Technology
2015-2025
Infrared Processing and Analysis Center
2015-2025
Institut für Palliative Care
2019
Western University
2017
Center for Astrophysics Harvard & Smithsonian
2007-2017
Fleet Science Center
2007-2016
Jet Propulsion Laboratory
1996-2012
National Radio Astronomy Observatory
2008
University of Wisconsin–Madison
2008
Association of Universities For Research In Astronomy
2008
We construct dynamical models for a sample of 36 nearby galaxies with Hubble Space Telescope (HST) photometry and ground-based kinematics. The assume that each galaxy is axisymmetric, two-integral distribution function, arbitrary inclination angle, position-independent stellar mass-to-light ratio Υ, central massive dark object (MDO) mass M•. They provide acceptable fits to 32 the some value M• Υ; four cannot be fitted have kinematically decoupled cores. ratios inferred well-fitted are...
We describe a correlation between the mass M_BH of galaxy's central black hole and luminosity-weighted line-of-sight velocity dispersion sigma_e within half-light radius. The result is based on sample 26 galaxies, including 13 galaxies with new determinations masses from Hubble Space Telescope measurements stellar kinematics. best-fit = 1.2 (+-0.2) x 10^8 M_sun (sigma_e/200 km/s)^(3.75 (+-0.3))over almost three orders magnitude in M_BH; scatter at fixed only 0.30 dex most this due to...
Observations of nearby galaxies reveal a strong correlation between the mass central dark object M and velocity dispersion sigma host galaxy, form log(M/M_sun) = + b*log(sigma/sigma_0); however, published estimates slope b span wide range (3.75 to 5.3). Merritt & Ferrarese have argued that low slopes (<4) arise because neglect random measurement errors in dispersions an incorrect choice for Milky Way Galaxy. We show these explanations account at most small part range. Instead, arises...
The Infrared Spectrograph (IRS) is one of three science instruments on the Spitzer Space Telescope. IRS comprises four separate spectrograph modules covering wavelength range from 5.3 to 38micron with spectral resolutions, R \~90 and 600, it was optimized take full advantage very low background in space environment. performing at or better than pre-launch predictions. An autonomous target acquisition capability enables locate mid-infrared centroid a source, providing information so that...
A survey that can cover the sky in optical bands over wide fields to faint magnitudes with a fast cadence will enable many of exciting science opportunities next decade. The Large Synoptic Survey Telescope (LSST) have an effective aperture 6.7 meters and imaging camera field view 9.6 deg^2, be devoted ten-year 20,000 deg^2 south +15 deg. Each pointing imaged 2000 times fifteen second exposures six broad from 0.35 1.1 microns, total point-source depth r~27.5. LSST Science Book describes basic...
The Palomar Transient Factory (PTF) is a fully-automated, wide-field survey aimed at systematic exploration of the optical transient sky. performed using new 8.1 square degree camera installed on 48-inch Samuel Oschin telescope Observatory; colors and light curves for detected transients are obtained with automated 60-inch telescope. PTF uses eighty percent 1.2-m fifty 1.5-m time. With an exposure 60-s reaches depth approximately 21.3 in g' 20.6 R (5 sigma, median seeing). Four major...
The Palomar Transient Factory (PTF) is a wide-field experiment designed to investigate the optical transient and variable sky on time scales from minutes years. PTF uses CFH12k mosaic camera, with field of view 7.9 deg2 plate scale 1'' pixel-1, mounted Observatory 48 inch Samuel Oschin Telescope. operation strategy devised probe existing gaps in phase space search for theoretically predicted, but not yet detected, phenomena, such as fallback supernovae, macronovae,. Ia orphan afterglows...
view Abstract Citations (759) References (127) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Centers of Early-Type Galaxies with HST. IV. Central Parameter Relations. Faber, S. M. ; Tremaine, Scott Ajhar, Edward A. Byun, Yong-Ik Dressler, Alan Gebhardt, Karl Grillmair, Carl Kormendy, John Lauer, Tod R. Richstone, Douglas We analyze Hubble Space Telescope surface-brightness profiles 61 elliptical galaxies and spiral bulges (hereafter "hot" galaxies). are...
NASA's Wide-field Infrared Survey Explorer (WISE) spacecraft has been brought out of hibernation and resumed surveying the sky at 3.4 4.6 um. The scientific objectives NEOWISE reactivation mission are to detect, track, characterize near-Earth asteroids comets. search for minor planets on December 23, 2013, first new object (NEO) was discovered six days later. As an infrared survey, detects based their thermal emission is equally sensitive high low albedo objects; consequently,...
We have obtained V-band images of 45 nearby elliptical galaxies and bulges using the original Planetary Camera Hubble Space Telescope. The majority sample is at distances 10-20 Mpc. This represents a substantial increase in number that been studied resolution few parsecs. At this resolution, many reveal previously unknown central disks, dust clouds, nuclear components. find two types brightness profiles. first type consists cores. These profiles "break" from steep outer power laws to shallow...
We describe the current plans for a spectroscopic survey of millions stars in Milky Way galaxy using Guo Shou Jing Telescope (GSJT, formerly Large Area Multi-Object Spectroscopic - LAMOST). The will obtain spectra 2.5 million brighter than $r<19$ during dark/grey time, and 5 $r<17$ or $J<16$ on nights that are moonlit have low transparency. begin fall 2012, run at least four years. telescope design constrains optimal declination range observations to $10^\circ<\delta<50^\circ$, site...
Spitzer Space Telescope imaging spectrometer observations of comet 9P/Tempel 1 during the Deep Impact encounter returned detailed, highly structured, 5- to 35-micrometer spectra ejecta. Emission signatures due amorphous and crystalline silicates, carbon, carbonates, phyllosilicates, polycyclic aromatic hydrocarbons, water gas ice, sulfides were found. Good agreement is seen between ejecta material emitted from C/1995 O1 (Hale-Bopp) circumstellar around young stellar object HD100546. The...
In a companion paper by Koposov et al., RR Lyrae from \textit{Gaia} Data Release 2 are used to demonstrate that stars in the Orphan stream have velocity vectors significantly misaligned with track, suggesting it has received large gravitational perturbation satellite of Milky Way. We argue such mismatch cannot arise due any realistic static Way potential and then explore perturbative effects Large Magellanic Cloud (LMC). find LMC can produce precisely observed motion-track we therefore use...
Perhaps the most noteworthy of recent findings in extragalactic globular cluster (GC) research are multimodal GC metallicity distributions seen massive early-type galaxies. We explore origin these distinct populations, implications for galaxy formation and evolution, identify several new properties systems. First, when we separate metal-rich metal-poor subpopulations, galaxies with bimodal distributions, find that mean GCs correlates well parent luminosity but ones does not. This indicates...
Black hole (BH) masses that have been measured by reverberation mapping in active galaxies fall significantly below the correlation between bulge luminosity and BH mass determined from spatially resolved kinematics of nearby normal galaxies. This discrepancy has created concern one or both techniques suffer systematic errors. We show are consistent with recently discovered relationship galaxy velocity dispersion. Therefore, luminosities probable source disagreement, not problems either...
We analyze HST+WFPC2 images of 77 early-type galaxies. Brightness profiles are classed into "core" or "power-law" forms. Cores typically rounder than power-law Nearly all power-laws with central ellipticity >=0.3 have stellar disks, implying that disks present in epsilon <0.3, but not visible due to unfavorable geometry. A few low-luminosity core galaxies also disks; these may be transition forms from power-laws. and both twisting isophotes at small radii. Core somewhat weaker color...
We present a new catalog of photometric and spectroscopic data on M31 globular clusters (GCs). The includes optical near-infrared photometry for substantial fraction the 435 cluster candidates. use these to determine reddening intrinsic colors individual clusters, we find that extinction laws in Galaxy are not significantly different. There significant (up 0.2 mag V-K) offsets between clusters' simple stellar population predicted by synthesis models; suggest due systematic errors models....
We present Hubble Space Telescope WFPC2 images of elephant trunks in the H II region M16. There are three principle results this study. First, morphology and stratified ionization structure interface between dense molecular material interior is well understood terms photoionization a photoevaporative flow. Photoionization models an empirical density profile capture essential features observations, including extremely localized [S II] emission at observed offset peaks lower higher lines. The...
We report on the detection in Sloan Digital Sky Survey data of a 63°-long tidal stream stars, extending from Ursa Major to Cancer. The has no obvious association with orbit any known cluster or galaxy. contrast detected is greatest when using star count filter that matched color-magnitude distribution stars M13, which suggests making up are old and metal-poor. visible portion very narrow about 8.5 kpc above Galactic disk, suggesting progenitor was globular cluster. While surface density...
We present a study of globular clusters (GCs) in 17 relatively nearby early-type galaxies, based on deep F555W and F814W images from the Wide Field Planetary Camera 2, board Hubble Space Telescope. A detailed analysis color distributions, cluster sizes, luminosity functions is performed compared with GCs Milky Way. In nearly all cases, KMM test returns high confidence level for hypothesis that sum two Gaussians provides better fit to observed distribution than single Gaussian, although...
view Abstract Citations (302) References (12) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Family of Models for Spherical Stellar Systems Tremaine, Scott ; Richstone, Douglas O. Byun, Yong-Ik Dressler, Alan Faber, S. M. Grillmair, Carl Kormendy, John Lauer, Tod R. We describe a one-parameter family models stable spherical stellar systems in which the phase-space distribution function depends only on energy. The have similar density profiles their outer...
We present axisymmetric, orbit superposition models for 12 galaxies using data taken with the Hubble Space Telescope (HST) and ground-based observatories. In each galaxy, we detect a central black hole (BH) measure its mass to accuracies ranging from 10% 70%. demonstrate that in most cases BH detection requires both HST data. Using alone does provide an unbiased of (provided they are fitted fully general models), but at greatly reduced significance. The significant correlation host galaxy...