... In order to obtain a quantitative estimate of the accuracy and reliability of our data reduction procedures and results, we have performed a data reduction pipeline based on the following steps: i) define a set of simulated HST-like images with synthetic globular cluster stellar distributions, which provide the ``true'' data for comparison; ii) convolve these images with appropriate assumptions of PSF and noise in order to construct simulated `` observed '' ... It contains 470 stars. b) ...

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• Model Fitting
• The Spitzer discovery of a galaxy with infrared emission solely due to AGN
• A New Database of Observed Spectral Energy Distributions of Nearby Starburst

... Posts tagged ?background? ... Probability density functions are another way of summarizing the consequences of assuming a Gaussian error distribution when the true distribution is Poisson. We can compute the posterior probability of the intensity of a source , when some number of counts are observed in a source region, and the background is estimated using counts observed in a different region. ... In both cases a background of 200 counts collected in an area 40x the source area is used. ...

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• The AstroStat Slog Blog Archive When you observed zero counts, you didn?t not
• The AstroStat Slog PDF
• The AstroStat Slog Blog Archive Significance of 5 counts

... PPTA timeline . ... List of projects . ... RedGW . ... One of the main goals of pulsar timing array projects is to limit the existence of a background of gravitational waves (GWs). Jenet et al. (2006) developed a method to determine such a limit if (and only if) the pulsar timing residuals were statistically white. In the paper we used data from six pulsars from the PPTA project to obtain a limit. The remaining pulsars were rejected because their timing residuals were not white. ...

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• PPTA Wiki | Projects / HellDown
• The observed distribution
• Research - All-sky map of high-velocity clouds

... Chapter 14. ... Data consist of numbers, of course. ... In the following sections, you will repeatedly encounter the following paradigm: § apply some formula to the data to compute a statistic § compute where the value of that statistic falls in a probability distribution that is computed on the basis of some null hypothesis § if it falls in a very unlikely spot, way out on a tail of the distribution , conclude that the null hypothesis is false for your ... 609 610 Chapter 14. ...

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• http://www.arcetri.astro.it/irlab/doc/library/nr/f14-0.pdf
• IBIS - Flat Fielding
• CHIANTI atomic database

Next: Generating Calibration Reference Files with an OPUS Pipeline . Up: Data Pipelines and Quality Control . ... Space Telescope Science Institute, Baltimore, MD 21218 . ... The OPUS pipeline data processing software, developed at the Space Telescope Science Institute (STScI), handles this demanding level of throughput by providing a distributed, concurrent pipeline processing environment for the set of applications that transform the raw telescope telemetry into archival products. ...

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• Simulation of HST PSFs using Tiny Tim
• A Distributed System for ``Phase II'' Proposal Preparation
• Bias-Free Parameter Estimation with Few Counts, by Iterative Chi-Squared

At Arecibo we have a variety of optical instruments that we use to study terrestrial airglow emissions. ... As a complement to the airglow instrumentation we also maintain a set of optical instruments, called lidars, used for "active" remote sensing of the atmosphere. That is, we generate our own source signal using lasers and measure the characteristics of the light scattered back from the atmosphere. ... An operations manual for the Optical Laboratories is currently under major revision. ...

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• The AO Optical Laboratories National Astronomy and Ionosphere Center (Arecibo
• /share/tghosh/sbhybrid
• weight on turret floor

... Fitting the observed dependence includes calculations of the polarization cross-sections averaged over particles orientation and size distribution, their normalization and the comparison of obtained dependencies with Serkowski's curve representing observational data for a chosen star. ... Variations of the polarization factors with wavelength are shown in Fig. 16 for homogeneous spheroidal particles with PF orientation. ... The distinction between prolate and oblate spheroids is also clearly seen. ...

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• AI SPbU library of scattering codes
• Extinction properties (transmitted radiation)
• Database of Optical Properties -- Level: subpage

Hale-Bopp and the Plateau de Bure Interferometer . ... Credit Copyright: A. Rambaud, IRAM team, France Explanation: Comet Hale-Bopp is being observed by many different telescopes. ... These telescopes are being used to detect the presence of different molecules in the coma and tail of Comet Hale-Bopp. ... The abundance of different types of molecules in Comet Hale-Bopp 's coma give clues to its composition and history, as well as clues to the composition and history of our Solar System . ...

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• Hale-Bopp and the Plateau de Bure Interferometer
• Fermi s Gamma ray Pulsars
• Астронет > Hale-Bopp and the Plateau de Bure Interferometer

... lcplot (lcplot-1.19.1) [xmmsas_20070708_1801-7.1.0] . ... Reconstruct net source counts and total counts rebinned : Perform variability tests on rebinned net source counts : Calculate mean count rate and variance. Test the null hypothesis (the source is not variable) by : - Processing a Chi Square fit between the count distribution and a constant distribution whose value is equal to the observed mean (statistic and probability are computed). ... Close plot. End subroutine lcplot . ...

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... New Mexico State University is seeking a technical and computer-oriented person as a Support Astronomer for nighttime astronomical observing at Apache Point Observatory (APO) with the Astrophysical Research Consortium (ARC) 3.5m Telescope. б  . ... Paper/email documents will not be accepted. ... TELESCOPE OPERATIONS SPECIALIST . ... Responsibilities include nightly operation of the 3.5m telescope and instruments, Quality monitoring the data streams and system performance and observing efficiency. ...

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• MILT Description
• lsst.tcc: include/tcc/tcsShim.h Source File
• lsst.coordConv: include/coordConv/site.h Source File

... The sample of the Local Volume galaxies (distance smaller than 10 Mpc) gives a unique opportunity to study the properties of galaxies including the weakest objects: the absolute magnitude M B -10 and the virial mass M vir 10 9 M x263C;. ... Luminosity function of the Local Volume galaxies. ... The luminosity functions for galaxies are presented: red dashed line - from the 2dFGRS survey (Norberg et al. 2002); blue dash-dotted line - from the SDSS survey (Blanton et al. ...

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• Detection of Radio Transients and Variable Radio Sources Using the Archive Data
• Measurement of the dark halo shape in polar ring galaxies
• HD965

Next: Star Formation Rate and Up: No Title Previous: Calculation of Evolutionary Tracks . To start calculations, we choose the distributions of the initial binary parameters: the mass of the primary ZAMS component, , binary mass ratio, , orbital separation a . ... whereas the mass ratio distribution is not. ... The zero assumption often made is that the mass ratio distribution has a flat shape, that is binaries with a high mass ratio occur as frequently as those with equal masses. ...

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• Galactic Gravitational Wave Background
• Introduction
• Binary Pulsar Diversity and High Neutron Star Birth Velocity

Over the coming weeks an international team, including Simon Jeffery , Vincent Woolf and Amir Ahmad of the Armagh Observatory, will use over fifteen different telescopes to make over one hundred nights of observations of just one star to learn about its internal structure. ... Although the approach has been used before, this may be the first time that a global asteroseismology project has tried to measure both light and spectrum variations at the same time for any star apart from the Sun. ...

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• Stellar Atmospheres Software
• sfit help file
• Armagh Observatory: Chris Winter [ lte-codes ]

NMW survey overview . Access image archive . ... The New Milky Way survey aims to detect bright (V<13.5) optical transients near the Galactic plane using an automated wide-field (8x6 deg.) system capable of surveying the whole Milky Way area visible from the observing site in one night. ... All images obtained during the transient search survey are available online (please use the image archive access form ). ... Images per field: . ... Images per night: . ... Milky Way imaging time: . ...

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... Our resulting sample of ELGs presented in Tables 2 and 3 is not artificially biased to any specific type of galaxies. ... Since we are looking for selection of a sample of Case BCGs, it is interesting to examine how the detected BCGs are connected with Case emission-line codes. ... Altogether BCGs comprise about 60 % of all Case ELGs which display emission lines in our spectra, or about 44 % of all Case galaxies with some emission-line code. ... Among those with the code ``w'' about 40 % are BCGs. ...

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• Optical spectroscopy
• Distribution Policy
• Introduction

... Science . ... Science Users Information > Science Activities > APEX Science Verification > SHFI . ... Observing Facilities . ... Observing with ESO Telescopes . ... Telescope Time Allocation . ... ESO Data . ... The Science Verification (SV) observations of the APEX Swedish Heterodyne Facility Instrument were observed in March 2008. ... A selection of the APEX-1 proposals listed below have been observed during the week of joint SV observations in March 2008, and later during the ESO time of period...

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• ESO - ESO-MIDAS Releases and Distribution
• ESO - European ALMA Regional Centre
• FORS1 Photometric System Characterization

Chiaki Kobayashi, Ralph Sutherland How galaxies did form and evolution? - to answer this unsolved problem, we are simulating the formation and evolutionary history of galaxies in the Universe, including star formation, supernovae feedback, and chemical enrichment. Comparing the spacial distribution of elements within galaxies with observations, we will examine fundamental physical processes that drive galaxy formation. ... COALA : Universe Galaxy AGN Star Planet ...

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• The SMS Survey
• Siding Spring Survey
• Software Maintenance Manual

XmCCD ----- The programs provided here offer a Linux graphical user interface to astronomical and scientific CCD cameras. ... It is the latest one they offer and the files included allow support for Android and Mac OS X. This distribution of XmCCD includes source code to utilize the SBIG shared library libsbigudrv.so with a Motif-based graphical user interface. ... The XmCCD source package includes and will install: SAOimage ds9 xpa cfitsio SAOimage is the primary image display for XmCCD. ...

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• http://www.astro.louisville.edu/software/sbig/archive/xmccd-4.2.2/README
• http://www.astro.louisville.edu/software/sbig/xmccd-5.1/README
• http://www.astro.louisville.edu/software/sbig/archive/xmccd-4.0/README

... This program will be a part of AATM-0.06 examples when this version is released. ... Comments regarding this example welcome at: // Bojan Nikolic b.nikolic@mrao.cam.ac.uk // # include string # include vector # include iostream # include fstream // Unfortunately the using statement below is required because of poor // desgin of the header files using namespace std ; # include ATMRefractiveIndexProfile.h # include ATMPercent.h # include ATMPressure.h # ...

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• Inference of Coefficients for Use in Phase Correction Bojan Nikolic web pages
• Paper I: Method Bojan Nikolic web pages (r. 329)
• OptInt PmWiki : PmWiki / Wiki Style Examples

... The Network Time Protocol (NTP) is used to synchronize the time of a computer client or server to another server or reference time source, such as a radio or satellite receiver or modem. ... Information on the NTP architecture, protocol and algorithms can be found in the Further Information and Bibliography page. The Building and Installing the Distribution page presents an overview of the procedures for compiling the distribution and installing it on a typical client or server. ...

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• Further Information and Bibliography
• Configuration Options
• Building and Installing the Distribution