Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of California, BerkeleyUS1.3k papers
- Goddard Space Flight CenterUS1.3k papers
- California Institute of TechnologyUS1.3k papers
- The Ohio State UniversityUS1.2k papers
- Centre National de la Recherche ScientifiqueFR1.1k papers
- Massachusetts Institute of TechnologyUS1.1k papers
- University of Maryland, College ParkUS1k papers
- Center for Astrophysics Harvard & SmithsonianUS975 papers
- Lawrence Berkeley National LaboratoryUS897 papers
- University of ChicagoUS889 papers
- University of WashingtonUS868 papers
- Yale UniversityUS848 papers
180 papers · 2 filters
Exploring the Nature of Weak Chandra Sources near the Galactic Centre
R. M. Bandyopadhyay, K. M. Blundell, Ph. Podsiadlowski +5
We present early results from the first IR imaging of the weak X-ray sources discovered in a recent Chandra survey towards the Galactic Centre. From our VLT observations we will id…
Nucleosynthesis in The Oxygen-Rich Supernova Remnant G292.0+1.8 from Chandra X-Ray Spectroscopy
Sangwook Park, John P. Hughes, Patrick O. Slane +4
We continue our analysis of the Galactic oxygen-rich supernova remnant (SNR) G292.0+1.8, which was observed with the {\it Chandra X-ray Observatory}. The high angular resolution {\…
Observations and Theoretical Implications of the Large Separation Lensed Quasar SDSS J1004+4112
M. Oguri, N. Inada, C. R. Keeton +25
We study the recently discovered gravitational lens SDSS J1004+4112, the first quasar lensed by a cluster of galaxies. It consists of four images with a maximum separation of 14.62…
A Catalog of Compact Groups of Galaxies in the SDSS Commissioning Data
B. C. Lee, S. S. Allam, D. L. Tucker +20
Compact groups (CGs) of galaxies -- relatively poor groups of galaxies in which the typical separations between members is of the order of a galaxy diameter -- offer an exceptional…
Search for Galaxy Clustering around a Quasar Pair at z=4.25 found in the Sloan Digital Sky Survey
Masataka Fukugita, Osamu Nakamura, Donald P. Schneider +2
We present an investigation of the environment (\approx 600 kpc radius) of a pair of luminous z=4.25 quasars, SDSS J1439-0034 A,B, separated by 33''. An analysis of high-quality Su…
Spatial Variations of Galaxy Number Counts in the SDSS I.: Extinction, Large-Scale Structure and Photometric Homogeneity
Masataka Fukugita, Naoki Yasuda, Jon Brinkmann +5
We study the spatial variation of galaxy number counts using five band photometric images from the Sloan Digital Sky Survey. The spatial variation of this sample of 46 million gala…
The H alpha Luminosity Function of Morphologically Classified Galaxies in the Sloan Digital Sky Survey
Osamu Nakamura, Masataka Fukugita, Jon Brinkmann +1
We present a study of the H line emission from a sample of 1482 optically-selected, morphologically-classified bright galaxies (median redshift of 0.05) derived from the Sloan D…
A Gravitationally Lensed Quasar with Quadruple Images Separated by 14.62 Arcseconds
N. Inada, M. Oguri, B. Pindor +29
Gravitational lensing is a powerful tool for the study of the distribution of dark matter in the Universe. The cold-dark-matter model of the formation of large-scale structures pre…
Planetary Collisions: Electromagnetic Signals
Bing Zhang, Steinn Sigurdsson
We investigate the electromagnetic signals accompanied with planetary collisions and their event rate, and explore the possibility of directly detecting such events. A typical Eart…
Quasi-universal Gaussian jets: a unified picture for gamma-ray bursts and X-ray flashes
Bing Zhang, Xinyu Dai, Nicole M. Lloyd-Ronning +1
An observed correlation Ep \propto (E_{iso})^{1/2} extending from Gamma-ray Bursts (GRBs) to X-ray flashes (XRFs) poses problems both for a power-law universal jet model where the…
IZw1 observed with XMM-Newton: Low-energy spectral complexity, iron lines, and hard X-ray flares
L. C. Gallo, Th. Boller, W. N. Brandt +2
We present a 20 ks XMM-Newton observation of the prototypical Narrow-Line Seyfert 1 galaxy IZw1. The best-fit model to the data is a double blackbody plus a dominant power-law, on…
SDSS J115517.35+634622.0: A Newly Discovered Gravitationally Lensed Quasar
Bart Pindor, Daniel J. Eisenstein, Naohisa Inada +12
We report the discovery of SDSSJ115517.35+634622.0, a previously unknown gravitationally lensed quasar. The lens system exhibits two images of a quasar, with an image se…
Central Compact Objects in Supernova Remnants
George G. Pavlov, Divas Sanwal, Marcus A. Teter
There are point-like sources in central regions of several supernova remnants which have not been detected outside the X-ray range. The X-ray spectra of these Central Compact Objec…
Characteristics of Diffuse X-Ray Line Emission within 20 pc of the Galactic Center
Sangwook Park, Michael P. Muno, Frederick K. Baganoff +5
Over the last 3 yrs, the Galactic center (GC) region has been monitored with the Chandra X-Ray Observatory. With 11 Chandra observations through 2002 June, the total effective expo…
Year-scale morphological variation of the X-ray Crab Nebula
K. Mori, D. N. Burrows, G. G. Pavlov +3
We present year-scale morphological variations of the Crab Nebula revealed by Chandra X-ray observatory. Observations have been performed about every 1.7 years over the 3 years fro…
Dramatic X-ray Spectral Variability of the Broad Absorption Line Quasar PG2112+059
S. C. Gallagher, W. N. Brandt, Beverley J. Wills +3
With a 1999 ASCA observation, PG2112+059 became notable as the first Broad Absorption Line (BAL) quasar found to exhibit a typical radio-quiet quasar X-ray continuum underlying a l…
Fragmentation and the formation of primordial protostars: the possible role of Collision Induced Emission
Emanuele Ripamonti, Tom Abel
The mechanisms which could lead to chemo-thermal instabilities and fragmentation during the formation of primordial protostars are investigated analytically. We introduce approxima…
Blue horizontal branch stars in the Sloan Digital Sky Survey: II. Kinematics of the Galactic halo
Edwin Sirko, Jeremy Goodman, Gillian R. Knapp +6
We carry out a maximum-likelihood kinematic analysis of a sample of 1170 blue horizontal branch (BHB) stars from the Sloan Digital Sky Survey presented in Sirko et al. (2003) (Pape…
Blue horizontal branch stars in the Sloan Digital Sky Survey: I. Sample selection and structure in the Galactic halo
Edwin Sirko, Jeremy Goodman, Gillian R. Knapp +6
We isolate samples of 733 bright (g < 18) and 437 faint (g > 18) high-Galactic latitude blue horizontal branch stars with photometry and spectroscopy in the Sloan Digital Sky Surve…
Discovery of Globular Clusters in the Proto-Spiral NGC2915: Implications for Hierarchical Galaxy Evolution
G. R. Meurer, J. P. Blakeslee, M. Sirianni +30
We have discovered three globular clusters beyond the Holmberg radius in Hubble Space Telescope Advanced Camera for Surveys images of the gas-rich dark matter dominated blue compac…
Gamma-Ray Bursts: Progress, Problems & Prospects
Bing Zhang, Peter Meszaros
The cosmological gamma-ray burst (GRB) phenomenon is reviewed. The broad observational facts and empirical phenomenological relations of the GRB prompt emission and afterglow are o…
Detection of Intergalactic HeII Absorption at Redshift 3.5
W. Zheng, K. Chiu, S. F. Anderson +5
The large number of quasars found in the Sloan Digital Sky Survey has allowed searches for elusive, clear lines of sight towards HeII Ly-alpha absorption, a sensitive probe of the…
The Spectral Energy Distribution and Emission-Line properties of the NLS1 Galaxy Arakelian 564
P. Romano, S. Mathur, T. J. Turner +11
We present the intrinsic spectral energy distribution (SED) of the NLS1 Arakelian 564, constructed with contemporaneous data obtained during a multi-wavelength, multi-satellite obs…
SDSS J1335+0118: A New Two-Image Gravitational Lens
Masamune Oguri, Naohisa Inada, Francisco J. Castander +13
We report the discovery of the two-image gravitationally lensed quasar SDSS J1335+0118. The object was selected as a lens candidate from the Sloan Digital Sky Survey. The imaging a…