A5028532950- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- CCD and CMOS Imaging Sensors
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- SAS software applications and methods
- Adaptive optics and wavefront sensing
- Infrared Target Detection Methodologies
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Particle accelerators and beam dynamics
- Calibration and Measurement Techniques
- Cosmology and Gravitation Theories
- Advanced Semiconductor Detectors and Materials
- Pulsars and Gravitational Waves Research
- Historical Astronomy and Related Studies
- Scientific Research and Discoveries
- Geophysics and Sensor Technology
- Photorefractive and Nonlinear Optics
- Satellite Image Processing and Photogrammetry
- Mitochondrial Function and Pathology
- Chalcogenide Semiconductor Thin Films
Renaissance Sciences Corporation (United States)
2006
California Institute of Technology
1997-2001
TMT Observatory
1997-1999
Massachusetts Institute of Technology
1992-1998
Association of Universities For Research In Astronomy
1998
U.S. National Science Foundation
1998
Kitt Peak National Observatory
1998
University of Hawaii System
1995-1996
University of Hawaiʻi at Mānoa
1995
IIT@MIT
1992
We report data for $I$ band Surface Brightness Fluctuation (SBF) magnitudes, V-I colors, and distance moduli 300 galaxies. The Survey contains E, S0 early-type spiral galaxies in the proportions of 49:42:9, is essentially complete E to Hubble velocities 2000 km/s, with a substantial sampling out 4000 km/s. median error modulus 0.22 mag. also present two new results from Survey. (1) compare mean peculiar flow velocity (bulk flow) implied by our distances predictions typical cold dark matter...
We report on HST and Palomar optical images of the field GRB 990123, obtained 8 9 February 1999. find that transient (OT) associated with 990123 is located an irregular galaxy, magnitude V=24.20 +/- 0.15. The strong metal absorption lines seen in spectrum OT, along low probability a chance superposition, lead us to conclude this galaxy host GRB. OT projected within ~1'' visible stellar host, nearer edge than center. cannot, basis, rule out galactic nucleus as site GRB, since unusual...
We present B-, V-, RC-, IC-, J-, H-, K-, and K'-band observations of the optical transient (OT) associated with GRB 970228, based on a reanalysis previously used images unpublished data. In order to minimize calibration differences, we have collected analyzed most photometry consistently determined magnitude OT relative set secondary field stars. confirm our earlier finding that early decay light curves (before 1997 March 6) was faster than at intermediate times (between 6 April 7). At late...
We study the globular cluster (GC) populations of 21 giant elliptical galaxies in 19 Abell clusters. This method, applied here primarily R band, is based on surface brightness fluctuations technique extragalactic distance measurement. The sample range redshift from 5000 to 10,000 \kms, and were selected Lauer & Postman (1994) survey brightest (BCGs). find a tight correlation between GC specific frequency S_N central bright galaxy velocity dispersion. also correlates well with X-ray...
We report on observations of the fading optical counterpart gamma-ray burst GRB 970228, made with Hubble Space Telescope (HST) and Keck I telescope. The (GRB) was observed approximately 6 months after outburst, 1997 September 4, using HST/STIS CCD, 1 year 1998 February 24, HST/NICMOS, April 4 NIRC Keck. unresolved is detected by STIS at V=28.0 ± 0.25, consistent a continued power-law decline exponent -1.10 0.05. located within, but near edge of, faint extended source diameter ~08 integrated...
We present the results from a multiband optical imaging program that has definitively confirmed existence of supercluster at z approximately 0.91. Two massive clusters galaxies, Cl 1604+4304 z=0.897 and 1604+4321 z=0.924, were originally observed in high-redshift cluster survey Oke, Postman, & Lubin. They are separated by 4300 km s-1 radial velocity 17&arcmin; on plane sky. Their physical redshift proximity suggested promising candidate. Deep BRi region between two indicates large population...
A catalog of Cepheid variables is used to probe the kinematics Galactic disk. Radial velocities are measured for eight distant Cepheids toward l = 300; these new provide a particularly good constraint on distance center, R_0. We model disk with both an axisymmetric rotation curve and one weak elliptical component, find evidence ellipticity 0.043 +/- 0.016 near Sun. Using models, we derive R_0 7.66 0.32 kpc v_circ 237 12 km/s. The center agrees well recent determinations from distribution RR...
Using new radial velocity measurements of 47 faint southern hemisphere Galactic Cepheids, together with additional data from Metzger et al. (1991), gamma velocities are found for 58 low galactic latitude Cepheids. The is determined by using the period a Cepheid to generate 'typical' curve, then fitting curve two free parameters, velocity, and phase. generated second order Fourier series coefficients period. For Cepheids observations that sample over variety pulsation phases, better than 1.0...
We report I-band observations of the GRB 980329 field made on 1998 March 29 with 1.34 m Tautenberg Schmidt telescope, R-, J- and K-band April 1 APO 3.5 R- 3 Mayall 4 telescope at KPNO, 6-8 Keck-I 10 telescope. show that these other reported measurements are consistent a power-law fading optical/near-infrared source is coincident variable radio VLA J0702+3850. This firmly establishes this afterglow 980329.
view Abstract Citations (33) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Radial Velocities of 26 Northern Milky Way Cepheids Metzger, Mark R. ; Caldwell, John A. McCarthy, James K. Schechter, Paul J. Spectra taken with the Palomar 60 inch echelle spectrograph are used to obtain 231 radial velocity measurements northern hemisphere latitude between 15 and 140 deg b below 5 deg. The typical accuracy Cepheid velocities is 0.8 km/s. standard...
view Abstract Citations (23) References (22) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Whither the LSR: Anticenter Carbon Star Velocities Metzger, Mark R. ; Schechter, Paul L. We report new radial measurements of 179 carbon stars toward Galactic anticenter with accuracies 4 km/s. derive distances to from existing K-band photometry and an average galactocentric radius 13.9 kpc for in sample. Using velocities we find that star sample is moving radially...
We have obtained new observations of the gamma-ray bursts GRB 970228 and 970508 with Owens Valley Radio Observatory. was observed in 1 3 mm continuum bands. The field centered on position optical counterpart approximately 17 days after initial burst. not detected at either wavelength, which places σ upper limits 2.16 mJy 92.7 GHz 38.1 242.4 GHz. band, first X-ray source SAX J0653.8+7916 then transient by Very Large Array. A series five were made from 1997 May 10 (~2 burst detection) to 16...
We report the discovery of an arclike object 27'' from center cD galaxy in redshift z=0.066 cluster A2124. Observations with Keck II telescope reveal that is a background at z=0.573, apparently lensed into arc length ~85 and total R magnitude mR=20.86±0.07. The width resolved; we estimate it to be ~06 after correcting for seeing. A lens model A2124 core mass distribution consistent velocity dispersion reproduces observed geometry indicates magnification factor ≳9. With this magnification,...
We report Keck LRIS observations of an arclike background galaxy near the center Abell 2152 (z = 0.043), one three clusters comprising Hercules supercluster. The object has a redshift z 0.1423 and is situated 25'' north primary component A2152 brightest cluster (BCG). about 15'' in total length reddening-corrected R-band magnitude mR 18.55 ± 0.03. Its spectrum shows numerous strong emission lines, as well absorption features. strength Hα would imply star formation rate SFR ≈ 3 h-2 M⊙ yr-1...
Abstract The far infrared reflectivity spectrum of a KTiOPO4 single crystal from 15 up to 4000 cm−l for the b and c crystallographic axis, is reported first time.
We present Space Telescope Imaging Spectrograph observations of the optical transient (OT) counterpart γ-ray burster GRB 000301C obtained 5 days after burst, on 2000 March 6. CCD clear-aperture imaging reveals a R ≃ 21.50 ± 0.15 source with no apparent host galaxy. An 8000 s, 1150 Å < λ 3300 near-ultraviolet MAMA prism spectrum shows flat or slightly rising continuum (in fλ) between 2800 and Å, mean flux × 10-18 ergs s-1 cm-2 Å-1, sharp break centered at 2797 25 Å. interpret this as H I...
The first prototype of a HgCdTe infrared detector array with 1024 X pixels developed by the Rockwell International Science Center has been tested in new camera at UH 2.2 m telescope, 0.6 and CFHT. At tests were conducted both f/31, where images very high resolution obtained using tip-tilt correction, f/10 for wide field view. CFHT imaging (f/8) adaptive optics work was done. HAWAII (HgCdTe astronomical area imager) device achieved good performance. In system, double correlated readnoise 15...
Using a new f/31 secondary on tip‐tilt platform, we have built an image‐stabilization system which has been used regularly for astronomical imaging and spectroscopy the University of Hawaii 2.2 m telescope. Diffraction‐limited cores stellar point‐spread functions are achieved in near‐infrared imaging, with Strehl ratios as high 0.47. K‐band images 03 FWHM resolution (without deconvolution) routinely obtained. The construction, operation, capability current described, summary recent...
We present new optical observations of the z = 0.282 cluster Abell 697 from Keck Observatory. Images show asymmetric disturbed structure in cD halo and a previously unknown source that is likely faint gravitational lens arc. A spectrum arc did not yield redshift, but its colors suggest it lies at > 1.3. construct plausible models for inner potential are able to reproduce arc, each case require be quite elliptical. The morphology best this may have undergone recent merger process forming...