bandpass photometry of the SDSS in combination with precise knowledge of galaxy ... in estimating more accurate photometric redshifts for galaxies. ...

... Title : Faint Photoelectric Photometric Standard Star Sequences. ... 82- 0192 was to establish highly accurate standard stars covering a wide range ...

New radio, infrared, and H/sub 2/O maser observations show that there is a 7'' angular separation between the protostar-like infrared source CRL 2591 and the compact H II region which has until now been identified with it, while the H/sub 2/O maser coincides with the infrared source. This result, together with an extension of ...

An approximate mathematical theory of the photometric integrating sphere is developed. The analysis is accurate to the first order in the ratio of the baffle area to the sphere wall area. The sphere is assumed to be occupied by a circular baffle and a sph...

The Voyager whole-disk observations of Triton at 0.41, 0.48, and 0.56 micron filter wavelengths are analyzed using a model which combines an improved version of Hapke's photometric equation with a thin atmospheric haze layer in the appropriate spherical geometry. The model is shown to describe accurately the phase curves over a range of phase angles and to ...

Photometric OGLE (I) and MACHO (VR) light curves together with AAT 2dF spectra of five OB eclipsing binaries in the SMC are analyzed. A specifically designed procedure for the correlated photometric and spectroscopic solution using the MORO light curve code and FITSB2 spectrum fitting approach yields accurate stellar and orbital ...

We present the first sub-arcsecond resolution two-dimensional stellar kinematics and X-ray observations of the prototypical starburst galaxy NGC 253 which define the position and nature of the galactic nucleus. These observations comprise some of the best probes of the central 300 pc of NGC 253, the nearest massive galaxy undergoing a powerful starburst, and will allow us to gain more insight into ...

We present the first sub-arcsecond resolution two-dimensional stellar kinematics and X-ray observations of the prototypical starburst galaxy NGC 253 which define the position and nature of the galactic nucleus. These observations comprise some of the best probes of the central 300 pc of NGC 253, the nearest massive galaxy undergoing a powerful starburst, and will allow us to gain more insight into ...

Coded in the radio, infrared, and x-ray emissions from the invisible nucleus of the Galaxy is mounting evidence that it is periodically the scene of titanic explosions. (WDM)

It has recently been demonstrated that one can accurately derive galaxy morphology from particular primary and secondary isophotal shape estimates in the Sloan Digital Sky Survey (SDSS) imaging catalog. This was accomplished by applying Machine Learning techniques to the Galaxy Zoo morphology catalog. Using the broad bandpass photometry of the SDSS in combination with precise ...

Accurate stellar colors are necessary for a wide range of PS1 science objectives. I will report on the status of our PS1 "ubercalibration" effort to provide improved photometric calibration over the entire 3 pi survey footprint. As an example, I will show how this new calibration improves dust reddening measurements using the "bluetip" method.

Four methods of determining 0.1-- 30% aluminum in beryllium and beryllium-- aluminum alloys were compared: gravimetric method with hydroxyquinoline; gravimetric method with hydroxyquinoline from aqueous acetone medium; complexometnic method by back titration with thorium; and photometrically with methylthymol blue. The most accurate method is the ...

Advancements in the performance and ease of use of absolute photodetectors based upon electrical substitution principals offers the possibility of a simplified and more accurate way to transfer the fundamental radiometric, photometric, and pyrometric unit...

A method used at LASL for the accurate and precise assay of plutonium metal was modified for the measurement of plutonium in plutonium oxides, nitrate solutions, and in other samples containing large quantities of plutonium in oxidized states higher than ...

New infrared observations of the two faintest known, late M dwarfs, Wolf 359 and +4 degrees 4048B (=VB 10) provide accurate luminosities and moderately well-determined tempratures (2500 and 2250 K, respectively). The photometric observations are fitted to...

The report describes a simple and quick flame-photometric absorption method for the determination of zinc content of the serum. The author demonstrates that this method is sufficiently reliable and sufficiently accurate. (Author)

The accurate analysis of eclipsing binary light curves is fundamental to obtaining information on the physical properties of stars. The model described accounts for the important geometric and photometric distortions such as rotational and tidal distortio...

Context: This paper reports the results obtained on the photometric redshifts measurement and accuracy, and cluster tomography in the ESO Distant Cluster Survey (EDisCS) fields. Aims: We present the methods used to determine photometric redshifts to discriminate between member and non-member galaxies and reduce the contamination by faint stars in ...

The spectral energy distributions (SEDs) of the local luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs) were thought to be well understood and exemplified by that of Arp 220, the "poster child" of these objects; but in fact, Arp 220 has been shown to be special in more than one way. Here we present comprehensive SEDs (from radio through x-ray) for the 88 most luminous (U)LIRGs in the ...

Observing and interpreting the 3D kinematics in our Galaxy will certainly yield to a detailed understanding of how galaxies form and evolve. With many new data available or coming, large and accurate photometric, proper motion or radial velocity surveys, important questions can be re-examined and more accurate answers are expected: for ...

led to incredible scientific discoveries. The development of radio, infrared, and X-ray telescopes has revealed a. Universe more exotic than ever imagined. ...

Selected photometric bands, spatial resolution, disk dimension in the frame and the scanned sky background level are determined in order to establish galactic structural parameters. A crude analysis could lead to erroneous results. Possible causes of error, as well as the minimum requirements for a precise determination of parameters, will be discussed. Our main goal is to ...

This paper describes a photometric stereo method designed for surfaces with spatially-varying BRDFs, including surfaces with both varying diffuse and specular properties. Our optimization-based method builds on the observation that most objects are composed of a small number of fundamental materials by constraining each pixel to be representable by a combination of at most two ...

This paper proposes a method for the spectrophotometric and extraction photometric determination of Mo(VI) and V(V) in alloys and steels using TPH. Determination of vanadium in titanium alloys is discussed. Results of the determination are presented. A discussion of determination of molybdenum in steels and alloys is given. The proposed method presented gives more ...

Methods which can reduce random and systematic errors in the determination of absolute dimensions of main sequence stars to values appreciably less than 10 percent are considered. Topics include the importance of choosing suitable double-lined eclipsing systems, spectral lines and photometric models for precision determination of stellar dimensions, and advantages of analyzing ...

Weak lensing tomography is a powerful new tool for constraining cosmology in a way that is independent of both the physics and systematics of other methods. By measuring the variation in the weak lensing shear as a function of background galaxy redshift, we make a purely geometric measurement of the expansion rate history. This has the ability to measure dark energy and even constrain deviations ...

Weak lensing tomography is a powerful new tool for constraining cosmology in a way that is independent of both the physics and systematics of other methods. By measuring the variation in the weak lensing shear as a function of background galaxy redshift, we make a purely geometric measurement of the expansion rate history. This has the ability to measure dark energy and even constrain deviations ...

Oblique-viewing endoscopes (oblique scopes) are widely used in computer assisted surgeries. The viewing direction of an oblique scope can be changed by rotating the scope cylinder; this extends the field of view, but also makes the geometric calibration process more difficult. Although few calibration methods have yet been developed, calibration is critical for the application of augmented-reality ...

New photometric and spectroscopic observations of the 1.7 day eclipsing binary IQ Persei (B8 + A6) have been analyzed to yield very accurate fundamental properties of the system. Reticon spectroscopic observations obtained at McDonald Observatory were used to determine accurate radial velocities of both stars in this slightly eccentric ...

After briefly reviewing the history of astronomical photometry, we calibrate secondary standard stars for a new photometric system (for the Sloan Digital Sky Survey) and show how this system can be used to discover a variety of objects of interest on the basis of their color indices. Using this new photometric system we identified candidate RR Lyrae stars ...

With this paper, we release accurate photometric redshifts for 1692 counterparts to Chandra sources in the central square degree of the COSMOS field. The availability of a large training set of spectroscopic redshifts that extends to faint magnitudes enabled photometric redshifts comparable to the highest quality results presently ...

Many of the cosmological tests to be performed by planned dark energy experiments will require extremely well-characterized photometric redshift measurements. Weak lensing analysis from simulations have shown that the true mean redshift of the objects in each photo-z bin must be known to better than 0.002(1+z) if errors in cosmological measurements are not to be degraded. A ...

This paper supplements Jiang et al., who studied 172 M31 globular clusters (GCs) and GC candidates from Battistini et al. on the basis of integrated photometric measurements in the Beijing-Arizona-Taiwan-Connecticut (BATC) photometric system. Here, we present multicolor photometric CCD data (in the BATC system) for the remaining 39 M31 ...

The SPRED spectrometer was photometrically calibrated by using the FTU tokamak plasma and the Grazing Incidence Time Resolving Spectrometer (GRITS) from the Johns Hopkins University [Stratton, Nucl. Fusion, Vol. 24, No. 6, pp. 767-777, 1984]. The photometric calibration of the GRITS spectrometer was transferred to the SPRED [Fonck, R.J., Applied Optics, ...

Infrared J (1.2 ..mu..m), H (1.6 ..mu..m), and K (2.2 ..mu..m) photometry is presented for a subsample of galaxies with morphological types of Sc and Sb of the sample types Sc and Sb of the sample by Rubin et al. and one edge-on spiral galaxy. After an overview of the science of infrared photometry, accurate photometric magnitudes are derived via curves of ...

The aim of this paper is to calculate an accurate large-scale flatfield for the STEREO HI-1 instruments. This is done by analysing the variation in intensity of stars in the background starfield as they pass across the CCD. In order to use the background starfield, a photometric calibration is performed which defines a HI magnitude scale and a conversion ...

The Large Synoptic Survey Telescope (LSST) will continuously image the entire sky visible from Cerro Pachon in northern Chile every 3-4 nights throughout the year. The LSST will provide data for a broad range of science investigations that require better than 1% photometric precision across the sky (repeatability and uniformity) and a similar accuracy of measured broadband ...

Precision photometric redshifts will be essential for extracting cosmological parameters from the next generation of wide-area imaging surveys. In this paper, we introduce a photometric redshift algorithm, ArborZ, based on the machine-learning technique of boosted decision trees. We study the algorithm using galaxies from the Sloan Digital Sky Survey ...

Precision photometric redshifts will be essential for extracting cosmological parameters from the next generation of wide-area imaging surveys. In this paper, we introduce a photometric redshift algorithm, ArborZ, based on the machine-learning technique of boosted decision trees. We study the algorithm using galaxies from the Sloan Digital Sky Survey ...

The Clementine multispectral dataset will enable compositional mapping of the entire lunar surface at a resolution of ~100-200 m, but a highly accurate photometric normalization is needed to achieve challenging scientific objectives such as mapping petrographic or elemental compositions. The goal of this work is to normalize the Clementine data to an ...

Photometric techniques are often used to observe stars and it can be demonstrated that fundamental stellar properties can be observationally determined using calibrated sets of photometric data. Many of the most powerful techniques utilized to calibrate stellar photometry employ the use of stars in clusters since the individual stars are believed to have ...

Acquiring accurate radiometric measurements is an essential part of characterizing non-resolvable satellites. For instance, temporal photometric signatures provide information on characteristic size, reflectance, and stability, spin rate, etc., and with more detailed analysis, shape and attitude. Multi-color photometric measurements ...

The Gaia mission is expected to provide highly accurate astrometric, photometric, and spectroscopic measurements for about 109 objects. Automated classification of detected sources is a key part of the data processing. Here a few aspects of the Gaia classification process are presented. Information from other surveys at longer wavelengths, and from ...

On March 16 of 1996, the authors used a new developed CCD camera attached to the 1 meter telescope at Yunnan Observatory, to take photometric observations for the comet Hyakutake. The positions have been measured accurately. From images observed, one can clearly see that the cometary coma is very large and basically symmetric with a peach shape.

We demonstrate that the diffraction removal procedure outlined by Hapke et al. [Icarus, 199, 210 (2009)] contains an error. By following their intended scheme we found that the Hapke model is not anisotropic enough to describe the reflectance patterns.

, and the superior light collecting power of the VLT combined with the high efficiency of the FORS spectroscopic but, more importantly, it allows us to look back into cosmic history. So far photometric redshifts have been derived for about 7000 FDF galaxies. But accurate spectroscopic redshifts (which take much

A recent flood of astronomical data has created much demand for sophisticated statistical and machine learning tools that can rapidly draw accurate inferences from large databases of high-dimensional data. In this Ph.D. thesis, methods for statistical inference in such databases will be proposed, studied, and applied to real data. I use methods for low-dimensional ...

Microquantities of sulfur were determined in Ti and Zr by photometric analysis. The catalytic iodineazide reaction and a highly-sensitive standard solution scale were used. The determination takes 2.5 -to 3 hours and is accurate to within 10%. (R.V.J.)

Variable blurring of astronomical images by seeing and the instrumental Point Spread Function (PSF) makes it challenging to obtain accurate photometric and morphometric measurements under changing observing conditions. I show how the new PSFEx PSF modeling software and the latest version of the SExtractor source extraction tool can be combined to perform ...

The application of a number of azo dyes of the Solochrome class for the spectrophotometric determination of quadri- and sexavalent uranium and thorium in hydrochloric acid- methanolic media is described. The methods developed make possible the accurate and rapid quantitative determination of microgram amounts of the elements. (auth)

The VIMOS VLT Deep Survey The assembly history of the stellar mass in galaxies: from the young to the old using two different samples: (1) an optical (I-selected 17.5 spectroscopic sample of about 10 200 galaxies, with photometric redshifts accurately calibrated on the VVDS spectroscopic sample