... 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. ...

We present an exhaustive quantitative comparison of all the known extinction curves in the Small and Large Magellanic Clouds (SMC and LMC) with our understanding of the general behavior of Milky Way extinction curves. ... The near-infrared extinction curves are calculated mainly from 2MASS photometry supplemented with DENIS and new JHK photometry. ... This result strengthens the picture dust extinction curves exhibit of a continuum of properties between those found in the Milky Way and the SMC bar. ...

... Hubble's Constant And The Expanding Universe (II) . ... 14.05.1996 . ... American astronomer Edwin Hubble played a major role in this profound discovery, coining the "Hubble constant". ... Two groups of astronomers trying to measure this fundamental constant using the Hubble Space Telescope (HST) are continuing to report conflicting results. ... The value of Hubble's constant was recently the subject of a popular public debate titled "The Scale of the Universe 1996: The Value of Hubble's Constant" ....

... We describe a parallel code for 3-D structure detection and morphological analysis. The method is based on a multiscale technique, the wavelet transform and on segmentation analysis. ... This paper presents a new parallel code, that allows a rapid structure detection and morphological analysis in a 3-D set of data points. ... Segmentation analysis. ... Our code is based on the programming paradigm MASTER/SLAVE . ... Finally, the morphological analysis is executed by the master. ...

ATNF Home . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . Australia Telescope Compact Array . Mopra radio telescope . ... Information & tools for observers . ... Australia Telescope Online Archive (ATOA) . ... ATCA | ... Visiting Parkes radio telescope . ... Parkes radio telescope webcam . ... The Australia Telescope National Facility Colloquium . ...

... Chapter 2 Values, Variables, and Literals This chapter discusses values that JavaScript recognizes and describes the fundamental building blocks of JavaScript expressions: variables and literals. ... In JavaScript, regular expressions are also objects. ... This chapter describes JavaScript regular expressions. ... This chapter provides an overview of these statements. ... Chapter 8 Details of the Object Model JavaScript is an object-based language based on prototypes, rather than being class-based. ...

... 2.3 Establishing the Extragalactic Distance Scale . ... 2.3.2 The Second Rung: Distances to stellar clusters . ... 2.3.4 Distances to Local Group Galaxies . ... The Luminosity Function of Planetary Nebulae . ... 3.2.2 Clusters of Galaxies . ... 4.2 Evidence for Dark Matter as a Function of Scale Size . ... 4.3 Other Dark Matter Indicators for Galaxies . ... What is the nature of the large-scale distribution of matter in the universe as traced by the three-dimensional galaxy distribution? ...

... Chapter 8 Values, Variables, and Literals This chapter discusses values that JavaScript recognizes and describes the fundamental building blocks of JavaScript expressions: variables and literals. ... Chapter 10 Object Model This chapter describes how to use objects, properties, functions, and methods, and how to create your own objects. Chapter 11 Predefined Core Objects and Functions Several objects are predefined in core JavaScript and can be used in either client-side or server-side scripts. ...

... Bojan Nikolic web pages home . Next: Fitting of models of radio spectra --.. ... I describe an approach to fitting and comparison of radio spectra based . on Bayesian analysis and realised using a new implementation of the . ... used maximum-likelihood fitting of radio spectra by allowing objective . ... implementation details of the computer code. ... overall approach described here may also be useful for analysis of other . ... Copyright 2012, Bojan Nikolic feedback welcome ...

... RECOMMENDED VALUES OF PHYSICAL CONSTANTS AND CONVERSION FACTORS. ... This reference must be included when these constants are used in a context where their full accuracy is important. ... elementary charge (of proton) . ... gravitational constant . ... unified atomic mass constant . ... of electron . ... of proton . ... Planck constant . ... Rydberg constant, m 0 2 m e e 4 c 3 /8h 3 . ... fine structure constant, m 0 e 2 c/2h . ... Bohr radius, h 2 ( pm 0 c 2 m e e 2 ) . ... Bohr magneton, e h /2m e...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . If the videos on this page do not play for you, try this alternative page . ... The two eighteenth-century Transits of Venus, in 1761 and 1769, provided a rare opportunity to determine the fundamental unit of astronomical distance: the distance from the Earth to the Sun. ... Also available as higher quality mp4 video . ...

... Section M-7 describes the basic problem of trigonometry (drawing on the left): finding the distance to some far-away point C, given the directions at which C appears from the two ends of a measured baseline AB. ... That means that the angle ? ... 2? r covers an angle 360њ . ... Suppose you want to estimate the distance to some distant landmark--e.g. a building, tree or water tower. ... Alpha Centauri, the sun-like star nearest to our solar system, has a distance of 4.3 years and a parallax of 0.75"....

... May 27, 1999 . NGC 4603 and the Expanding Universe . ... Explanation: NGC 4603, a galaxy with majestic spiral arms and intricate dust lanes, is 108 million light-years away. ... In fact, using the Space Telescope to pick out Cepheids in galaxies closer than NGC 4603, the Hubble Key Project Team has recently announced the completion of their 8 year effort to precisely measure galaxy distances and the expansion rate of the Universe - the Hubble Constant. ... About APOD > . ...

Optical and UV Spectrophotometric Standard Stars . ... A group headed by R. Bohlin at STScI have established a set of four white dwarf standards based on comparison of White Dwarf model atmospheres with HST FOS spectra. ... Extension of the white dwarf primary standards to more stars, giving 27 in total, are described in Bohlin (Proceedings of STScI HST Calibration Workshop, eds. A. Koratkar & C. Leitherer, p. 49, 1994) and in Bohlin (AJ, 111, 1743, 1996) . ...

The ESA/ESO Astronomy Exercise Series 2 . The Distance to Messier 100 as Determined by Cepheid Variable Stars . ... The small variations in distance to the individual Cepheid variable stars in the Cloud are negligible compared with the much larger distance to the SMC. ... In this way Cepheid variable stars can be used as one of the 'standard candles' in the Universe that act either as distance indicators themselves or can be used to calibrate (or set the zero point for) other distance indicators. ...

... We describe the current state and future of the WWW Jena-Petersburg Database of Optical Constants (JPDOC) that also contains references to papers and links to internet resources related to measurements or calculations of the optical constants of materials of astronomical interest. The most important part of the JPDOC is data measured in broad wavelength ranges and partly at low temperatures in the Jena Laboratory. ... Database of Optical Properties . Examples of data contained in the JPDOC . ...

Problem Set 2 - Cosmology­A3002 ­Due on or before November 7th. Can be sent via internal mail (Brian Schmidt, RSAA) use H0=70 km/s/Mpc, M=0.27, =0.73, w=-1 for all problems. ... Finish off your Monte Carlo simulation by selecting objects at random redshifts from 0<z<0.1, assuming that they have a mean absolute magnitude of M=-19.5 with a dispersion 0.2 magnitudes. ... Problem 2.1 (2 pt): In class we described the scale at which material can collapse in the Universe as the Jeans' length. ...

This group of four pages describes how the Arecibo 430 MHz radar makes simple measurements in the ionosphere. ... Radar Reflections From the Ionosphere . ... Or How are radio and TV stations like radars?) ... Consider two radio stations located on a mountain transmitting to a nearby city. ... A radar is like a radio station, but it has a receiver that picks up radio waves reflected from objects (targets). ... Although a radio station transmits continously, a radar can transmit short bursts of waves. ...

... 8, ``Celestial Mechanics'', 2002 Precision increase for the theory of relative motion of a satellite's pair K. V. Kholshevnikov Astronomical Institute of St.Petersburg State University, and Institute of Applied Astronomy, St.Petersburg, Russia Modern higher--precise theories of motion of special Artificial Earth Satel­ lites (geodetical, navigational) consider all forces which one may describe with at least 30% precision, including so exotical ...

Measuring\Omega and \Lambda with Type Ia Supernovae J.C. Niemeyer Max­Planck­Institut fЁur Astrophysik Karl­Schwarzschild­Strasse 1, D­85748 Garching, Germany B. Leibundgut European Southern Observatory Karl­Schwarzschild­Strasse 2, D­85748 Garching, Germany The explosive carbon incineration of white dwarfs produces very luminous events with no hydrogen in their spectra ­ Type Ia supernovae (SNe Ia). ... Their determination of\Omega and \Lambda is based on the analysis of 7 supernovae at redshifts z ? ...