A5004787126- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- History and Developments in Astronomy
- Nuclear Materials and Properties
- Space Science and Extraterrestrial Life
- Space exploration and regulation
- Metabolism and Genetic Disorders
- Advanced Vision and Imaging
- Radioactive element chemistry and processing
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- Spectroscopy and Laser Applications
- Metabolomics and Mass Spectrometry Studies
- Remote Sensing in Agriculture
- CCD and CMOS Imaging Sensors
- Environmental Chemistry and Analysis
- Geophysics and Gravity Measurements
- Relativity and Gravitational Theory
- Scientific Research and Discoveries
- Social Media and Politics
Canadian Nuclear Laboratories
2024-2025
Atomic Energy (Canada)
2024
Brigham and Women's Hospital
2023
Harvard University
2023
College of Staten Island
2010-2022
American Museum of Natural History
1999-2022
The Graduate Center, CUNY
2018-2022
City University of New York
2006-2022
Georgia Southern University
2018
York University
2006-2017
We present imaging data and photometry for the COSMOS survey in 15 photometric bands between 0.3 2.4 μm. These include taken on Subaru 8.3 m telescope, KPNO CTIO 4 telescopes, CFHT 3.6 telescope. Special techniques are used to ensure that relative calibration is better than 1% across field of view. The absolute accuracy from standard-star measurements found be 6%. corrected using galaxy spectra, providing colors accurate 2% or better. Stellar counts agree well with expected values. Finally,...
The Cosmic Evolution Survey (COSMOS) was initiated with an extensive allocation (590 orbits in Cycles 12-13) using the Hubble Space Telescope (HST) for high resolution imaging. Here we review characteristics of HST imaging Advanced Camera Surveys (ACS) and parallel observations NICMOS WFPC2. A square field (1.8$\sq$\deg) has been imaged single-orbit ACS I-F814W exposures 50% completeness sources 0.5\arcsec diameter at I$_{AB} $ = 26.0 mag. is a key part COSMOS survey, providing very...
We present UBVRIz' optical images taken with MOSAIC on the CTIO 4 m telescope of 0.32 deg2 Extended Hubble Deep Field-South. This is one four fields comprising MUSYC survey, which optimized for study galaxies at z = 3, active galactic nucleus (AGN) demographics, and Galactic structure. Our methods used astrometric calibration, weighted image combination, photometric calibration in AB magnitudes are described. calculate corrected aperture photometry its uncertainties find through tests that...
Large-scale structures (LSS) out to z $< 3.0$ are measured in the Cosmic Evolution Survey (COSMOS) using extremely accurate photometric redshifts (photoz). The Ks-band selected sample (from Ultra-Vista) is comprised of 155,954 galaxies. Two techniques -- adaptive smoothing and Voronoi tessellation used estimate environmental densities within 127 redshift slices. Approximately 250 statistically significant overdense identified $= with shapes varying from elongated filamentary more circularly...
In this paper we measure the merger fraction and rate, both minor major, of massive early-type galaxies (M_star >= 10^11 M_Sun) in COSMOS field, study their role mass size evolution. We use 30-band photometric catalogue COSMOS, complemented with spectroscopy zCOSMOS survey, to define close pairs a separation 10h^-1 kpc <= r_p 30h-1 relative velocity Delta v 500 km s^-1. major (stellar ratio mu = M_star,2/M_star,1 1/4) (1/10 < fractions galaxies, dependence on redshift morphology. The rate...
We analyze the morphological properties of a large sample 1503 70 micron selected galaxies in COSMOS field spanning redshift range 0.01<z< 3.5 with median 0.5 and an infrared luminosity 10^8<L_IR<10^14L_sun 10^11.4 L_sun. In general these are massive, stellar mass 10^10-10^12 M_sun, luminous, -25<M_K<-20. find strong correlation between fraction major mergers L_IR, at highest being up to 50%. also that spirals drops dramatically L_IR. Minor likely play role boosting for sources low...
We show how accretion rate governs the physical properties of a sample unobscured broad-line, narrow-line, and lineless active galactic nuclei (AGNs). avoid systematic errors plaguing previous studies AGN rates by using accurate intrinsic luminosities (Lint) from well-sampled multiwavelength spectral energy distributions Cosmic Evolution Survey, black hole masses derived virial scaling relations (for broad-line AGNs) or host–AGN narrow-line AGNs). In general, broad emission lines are present...
We present new evidence for AGN feedback in a subset of 69 quenched low-mass galaxies ($M_{\star} \lesssim 5\times10^{9}$ M$_{\odot}$, $M_{\rm{r}} > -19$) selected from the first two years SDSS-IV MaNGA survey. The majority (85 per cent) these appear to reside group environment. find 6 our sample that have an active is preventing on-going star-formation; this time such mechanism has been observed mass range. Interestingly, five six ionised gas component kinematically offset their stellar...
Vera C. Rubin Observatory is a ground-based astronomical facility under construction, joint project of the National Science Foundation and U.S. Department Energy, designed to conduct multi-purpose 10-year optical survey southern hemisphere sky: Legacy Survey Space Time. Significant flexibility in strategy remains within constraints imposed by core science goals probing dark energy matter, cataloging Solar System, exploring transient sky, mapping Milky Way. The survey's massive data...
The role of major mergers in galaxy and black hole formation is not well constrained. To help address this, we develop an automated method to identify late-stage before coalescence the galactic cores. resulting sample distinct from those obtained using pair-finding morphological indicators. Our relies on median-filtering high-resolution images order distinguish two concentrated nuclei at small separations. Using mock images, derive statistical contamination incompleteness corrections for...
Abstract While major mergers have long been proposed as a driver of both active galactic nucleus (AGN) activity and the <?CDATA ${M}_{\mathrm{BH}}\mbox{--}{\sigma }_{\mathrm{bulge}}$?> relation, studies moderate to high-redshift Seyfert-luminosity AGN hosts found little evidence for enhanced rates interactions. However, theory observation suggest that while these AGNs may be fueled by stochastic accretion secular processes, high-luminosity, high-redshift, heavily obscured are most likely...
view Abstract Citations (116) References (56) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectrophotometric Properties of Merging Galaxies Liu, Charles T. ; Kennicutt, Robert C., Jr. We present quantitative analysis long-slit spectrophotometry 40 merging and strongly interacting galaxy systems, in the wavelength range 3650-7100 Å. Along with optically selected objects, sample includes 10 ultraluminous IRAS galaxies ongoing merger activity. The mergers...
We present a large robust sample of 1503 reliable and unconfused 70 μm selected sources from the multiwavelength data set Cosmic Evolution Survey. Using Spitzer IRAC MIPS photometry, we estimate total infrared (IR) luminosity, LIR (8–1000 μm), by finding best-fit template several different libraries. The long-wavelength 160 allow us to obtain LIR, accurate within 0.2 0.05 dex, respectively. point enables significant improvement over luminosity estimates possible with only 24 detection. full...
Abstract UO2-Molybdenum (Mo) composites are being considered for Accident Tolerant Fuel (ATF) applications in commercial nuclear reactors. In this study, UO2-10 vol% Mo was fabricated using Spark Plasma Sintering (SPS), where the particle size of varied between 30 nm, 60 100 nm and 150 µm, to study its effect on densification composite. A decrease identified cause a shift peaks UO2-Mo towards higher temperature, due particles coating bigger UO2 particles. The situ ram displacement data used...
ADVERTISEMENT RETURN TO ISSUEPREVLetterNEXT(R)-3,3,3-Trifluoro-2-hydroxy-2-methylpropionamides Are Orally Active Inhibitors of Pyruvate Dehydrogenase KinaseThomas D. Aicher, Robert C. Anderson, Gregory R. Bebernitz, Gary M. Coppola, Charles F. Jewell, Douglas Knorr, Liu, Donald Sperbeck, Leonard J. Brand, Strohschein, Jiaping Gao, Christine Vinluan, Suraj S. Shetty, Carol Dragland, Emma L. Kaplan, Dominick DelGrande, Amin Islam, Xilin Lozito, Wieslawa Maniara, Erik Walter, and William...
view Abstract Citations (51) References (28) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Spectrophotometric Survey of Merging Galaxies Liu, Charles T. ; Kennicutt, Robert C., Jr. We present long-slit spectrophotometry 40 merging or strongly interacting galaxy systems in the wavelength range 3650-7100 A. Along with optically selected objects, sample includes 10 ultraluminous IRAS galaxies evidence ongoing merger activity. The data show a wide variety...
The adult kidney contains a population of low-cycling cells that resides in the papilla. These retain for long periods S-phase markers given as short pulse early life; i.e., they are label-retaining (LRC). In previous studies rat and mice, we found shortly after acute injury many quiescent papillary LRC started proliferating (Oliver JA, Klinakis A, Cheema FH, Friedlander J, Sampogna RV, Martens TP, Liu C, Efstratiadis Al-Awqati Q. J Am Soc Nephrol 20: 2315-2327, 2009; Oliver Maarouf O, Clin...
We present an H I and optical survey of 41 extremely isolated galaxies in attempt to search for the gaseous remnants galaxy formation process, predicted exist by hierarchical models formation. By observing isolated, quiescent, nonpeculiar we minimize chances that any extragalactic found will be another galaxy, tidal debris, or ejecta from a galactic fountain superwind. have obtained new archival data VLA ATCA clouds down M ~ 107 M☉ around these galaxies. 13 I-rich companions 10 surveyed....
Post-starburst galaxies (PSBs) have recently and rapidly quenched their star-formation, thus they are an important way to understand how transition from star-forming late-types quiescent early-types. The recent discovery of large cold gas reservoirs in PSBs calls into question the theory that must lose become quiescent. Optical Integral Field Spectroscopy (IFS) surveys revealed two classes PSBs: central with quenching regions ring outskirts. We analyze a sample 13 nearby (z < 0.1) spatially...
We present multiwavelength observations of the very luminous "E+A" galaxy known as G515 (J152426.50+080908.0), including deep Ks imaging, spatially resolved Hα spectroscopy, and radio observations. The data, together with detailed spectral synthesis galaxy's integrated stellar population, show that is a ~1 Gyr old postmerger, poststarburst galaxy. detect no Balmer line emission in galaxy, although there small amount [N II] λλ6548, 6583 Å emission. H I mass has 2 σ upper limit 1.0 × 109 M☉....
The rising trend of fake news in cyberspace has escalated with increasing velocity information exchange and an explosion sources. Combating the cyber security context is important due to its use as a content-based social engineering attack, or weaponization compromise corporate assets. This research aims explore proliferation this type threat through initial empirical analysis propagation particular emphasis on potential for generation weaponized form news. Antecedents were examined using...
We examine the faint-end slope of rest-frame V-band luminosity function (LF), with respect to galaxy spectral type, field galaxies redshift z < 0.5, using a sample 80,820 photometric redshifts in 2 deg2 Cosmic Evolution Survey (COSMOS) field. For all types combined, LF ranges from –1.24 –1.12, lowest bin highest. In (0.02 0.1), where magnitude limit is MV≲ − 13, α ∼ 1.1 for early-type energy distributions (SEDs) 1.9 low-extinction starburst SEDs. each SED category (early-type, Sbc, Scd+Irr,...