An investigation of the spectral energy distribution (SED) of the compact steep-spectrum (CSS) source and possible radio-loud narrow-line Seyfert 1 galaxy (NLS1), PKS 2004-447, is presented. ... Analysis of a non-contemporaneous, low-resolution optical spectrum suggests that the narrow-line region (NLR) is much more reddened than the X-ray emitting region suggesting that the gas-to-dust ratio in PKS 2004-447 may be very different than in our own Galaxy. ...

... The resolution element (one diode) for GHRS was matched to the width of the SSA. ... A delta-function spectra line observed through the SSA can be described by a Gaussian with a FWHM of about 0.925 diodes which is about 3.7 quarter-stepped pixels. ... Since an SSA spectrum is the best resolution we can obtain with GHRS, it is useful to describe the LSA LSF in terms of the SSA PSF. Consequently, we have measured the LSA-SSA differential LSF for a number of gratings and at a sample of wavelengths. ...

K-band Arcetri Obscured Supernova Search . What is the KAOSS Project? W hat is the KAOSS Project? Some recent surveys aimed at detecting Supernovae (SNe) in the optical have found that starburst galaxies do not show evidence for an enhanced SN rate, with respect to quiescent galaxies (Richmond et al. ... A similar result was obtained by Navasardyan et al. (2001) who looked for SNe in interacting galaxies, finding no evidence for correlations between SN rate and galaxy properties. ...

... There are four independent correlator boards available in the correlator spectrometer. Each board can be assigned any available bandwidth, center frequency, sampling level, polarization, and number of channels. ... Sampling level: Your data can be sampled with either 3-level, 3-level interleaved, or 9-level sampling. 9-level operation achieves 98% of the signal-to-noise of analog correlation, whereas 3-level sampling achieves 81%. ... You cannot use 9-level sampling with a 50-MHz bandpass. ...

Next: Extraction of Information Up: Image Manipulations Previous: Transformations . ... Basically, it is not possible to retrieve information on features with frequencies higher than the Nyquist frequency (see Equation ). Several different techniques are used depending on the data (see Wells 1980 for a general discussion of the methods). ... Another group of image restoration algorithms use iterative methods to obtain a solution which is consistent with the data. ...

... Optical: Nebulosity offset to NE. X-ray: Non-thermal shell, confused by the Vela SNR, with central source, and possible associated pulsar. Point sources: Central X-ray source, with optical nebula, and possible associated pulsar. ... ADS . ... 1998, Nature, 396, 142. -ray observations. ... 1999, ApJ, 519, L177. ... Chandra of central X-ray source. ... Optical observations of central source. ... 2005, ApJ, 619, L163. -ray observations. ... Deep optical observations of compact X-ray source. ...

Some Effects of Earthquakes, Temperature, Wind Stor ms and Barometric Pressure on the Inter ferometer at Hanford Robert Schofield Masahiro Ito Rauha Rahkola Evan Mauceli Ray Frey David Strom Jim Brau University of Oregon Some Concerns With Low Frequency Influences · Loss of lock · Need for increased servo loop gain · May eat up actuator range · Possible increased background in the LIGO frequency band · Possible modulation of noise in the LIGO band Guralp ...

Next: Conclusions Up: Selection Effects Previous: Inconsistent (or Inconsistently Applied) . Another possible bias, present in this as well as all other surveys which use spectral indices based upon nonsimultaneous data in their selection process, is due to variability. ... In order to minimize the effect of non-simultaneous radio survey data upon our samples, we decided to expand the common definition of flat-spectrum radio sources to extend to (instead of 0.5). ...

... Наблюдения (Модераторы: tlgleonid , SP ) > . Possible GRB . ... Отчеты о наблюдениях . ... Наблюдения . ... Оффлайн . Сообщений: 2108 . Благодарностей: 21 . ... 16 Февраль 2011, 19:16:44 ? ... SUBJECT: OT 110215: possible GRB from 2MASS J00264184+8324093 . ... reflector and CCD the bright optical flash was detected starting on 2011 . ... Lightcurve: http://hea.iki.rssi.ru/~denis/J002641+832409-LC-Sergei.png . ... Записан . ... Сообщений: 3068 . ... Ответ #1 : 16 Февраль 2011, 19:21:11 ? ...

... In laboratory the design and a manufacturing techniques mirror aspherical optics are developed ("fokon", ellipsoid, aspherical mirror).Such optical elements are made of widespread aluminium alloys on the standard equipment without use diamond turning. ... Using: optical blocks of not image optical devices for transitions, collimation, focus (concentration) radiations in a wide spectral range from UV to IR. Focusing and collimation of light; . ... circle aperture/ring aperture; . ... Back Forward . ...

... The power can be converted to the probability that the period found is not true, the false alarm probability (FAP). Scargle (1982) showed that the probability distribution returned by this method is exponential, and thus the probability of a false alarm is defined as , where z is the power at a given frequency and N is the number of frequencies sampled. Unfortunately, the formulation for calculating the FAP is only valid in the case where the data are not clumped in their sampling. ...

Application of IVOA software tools for radio sources investigation Zhelenkova O., Kopylov A., Chernenkov V. The interrelationship between the objects of astronomical catalogs in the different ranges of electromagnetic spectrum and their association into the real astrophysical source has obvious scientific interest. ... We used NVSS as the reference coordinate catalog. ... For 60% of radio sources identified with the objects of the radio catalogs we discovered optical candidates in SDSS survey. ...

Static Fourier spectrometers are often used for spectral measurements of the ionosphere emissions. There are two main advantages of Fourier spectrometers (FS) - large geometric factor and high spectral resolution; these parameters are two orders better than for grating spectral instruments. ... In scanning Fourier spectrometer optical and electric modulation of signal is used to avoid this problem, for static Fourier spectrometer there are no such ways. ...

... Optical constants of Fe 2 O 3 in the infrared spectral region. ... Optical constants: . amorphous Fe 2 O 3 . ... The Reflectance of polarized radiation at the incidence angle 12 deg was measured in the range from 1400 to 200 cm -1 for monocrystalline hematite (alpha-Fe 2 O 3 ) and amorphous Fe 2 O 3 samples. Special technique applied allowed to reduce the relative errors downto 1% for the reflectance values of 0.005-0.8. The optical constants were obtained by the Kramers-Kronig method. ...

... 2006: . A high angular resolution (0.4") was reached at the BTA as a result of use of an image stabilizer, coupled with the optical image cutter and a specialized echelle spectra reduction algorithm during the observations with high spectral resolution (R=75000) in the wavelength range of 450-650 nm. ... Archive . ... Last update: 20/02/2013 ...

... A tool for analyzing single-dish data, DISH, is developed on this platform. ... A complete Users' Manual and Reference Guide are available on the web in the AIPS ++ documentation sections. % dish # From the unix prompt, this # begins an AIPS ++ session # and creates the DISH tool # referred to as d . # d.show() hence calls the # dish function show - d.import('/home/gbtdata/AGBT02B_28_02','ohmaser', startscan=23,stopscan=28) # The import function converts # GBT FITS data to DISH format...

... Polarization spectra of 12 asteroids (bottom panel) and of two regions of the Moon (top panel). ... In particular we are interested in possible relationships between the wavelength-dependent variation of linear polarization and the properties of the surfaces, including albedo and composition. ... We found that objects with marginally different relative reflectance spectra (in the optical) may have totally different polarization spectra. ...

... Imaging control and image data flow registration is fulfilled by the onboard computer. This allows to control image acquisition in real time. ... The coordinate and time reference system (KKVO) has been developed for determination of s/c spatial orientation in real time as well as orbital parameters with a required frequency of spatial orientation and s/c postioning updatement. The data obtained by the system is used for s/c flight control and coordinate referencing of the remote sensing data. ...

... arXiv.org . astro-ph . ... We fit the near-infrared to radio spectral energy distributions of 30 luminous and ultra-luminous infrared galaxies with pure starburst models or models that include both starburst and AGN components to determine important physical parameters for this population of objects. In particular we constrain the optical depth towards the luminosity source, the star formation rate, the star formation efficiency and the AGN fraction. ...

... We present the results of our new observations of TYC 0075 01143 1, a recently discovered double-mode Scuti variable. We improved the frequencies and and pulsation amplitudes, detected the interaction frequencies , , and a possible nonradial frequency . ... The finding chart of TYC 0075 01143 1. ... Using our new observations of TYC 0075 01143 1, we improved the frequencies and , detected oscillations corresponding to interaction between and : and ; we also found a possible nonradial frequency . ...