mabs , the B-band absolute magnitude is computed from the corrected magnitude btc and the distance modulus modz (from the redshift) or mod0 (redshift-independent). For nearby galaxies ( v < 500 km/s, modz is not computed because it would be too imprecise (the peculiar motions dominate the Hubble flow), and the absolute magnitude is computed as: mabs = btc - mod0 For more distant galaxies, it is computed as: mabs = btc - modz . HyperLeda . Questions: leda@univ-lyon1.fr

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• Supernova Cosmology
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• Cosmology Tutorial - Part 2

... U. Amsterdam Explanation: The GRB distance scale controversy may have just ended with a flash . Gamma Ray Bursts (GRBs) are powerful explosions occurring in seemingly random positions on the sky. ... There they found a faint but variable optical source : a potential counterpart to the gamma-ray burst that was getting brighter. Most importantly, continued scrutiny showed that this optical transient had absorption lines with a redshift of about 0.8 - the distance scale of galaxies and quasars . ...

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• Астронет > Optical Transient Near GRB970508 Shows Distant Redshift
• Breaking Distant Light
• Астронет > Breaking Distant Light

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. ...

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• ASP: An Ancient Universe - The Age of Light from the Most Distant Galaxies
• ASP: Star Science in the Autumn Sky

Neutral Hydrogen Absorption Measurements of Four Distant Pulsars . and the Electron Density in the Inner Galaxy . ... Abstract We have used the VLA to measure neutral hydrogen absorption and emission spectra toward four distant, low-latitude pulsars in the inner Galaxy whose spectra have not been previously recorded. ... We use the companion spectra plus all published \HI absorption spectra in the direction of each pulsar to assist in the kinematic determination of pulsar distances. ...

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• A survey for H I in the distant Universe: the detection of associated 21-cm
• ATNF Media Release - December 1, 1998
• A Search for Distant Satellites of Neptune

... May 13, 1997 . Optical Transient Near GRB970508 Shows Distant Redshift . ... Explanation: The GRB distance scale controversy may have just ended with a flash . ... Most importantly, continued scrutiny showed that this optical transient had absorption lines with a redshift of about 0.8 - the distance scale of galaxies and quasars . ... Above is a "negative" image of the GRB970508 field , located near the north celestial pole, taken hours after the initial flash of gamma rays. ... About APOD > . ...

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• APOD: 2009 January 4 - Breaking Distant Light
• APOD: 2002 March 19 - Breaking Distant Light
• APOD: May 13, 1996 - Hubble's Constant And The Expanding Universe (I)

The HST Key Project to Measure the Hubble Constant . ... H from HST . G. A. Tammann, L. Labhardt, M. Federspiel, A. Sandage, A. Saha, F. D. Macchetto, and N. Panagia . The Hubble Deep Field Observations . R. E. Williams, B. S. Blacker, M. Dickinson, H. C. Ferguson, A. S. Fruchter, M. Giavalisco, R. L. Gilliland, R. A. Lucas, D. B. McElroy, L. D. Petro, and M. Postman . The Hubble Constant via the Leo-I Group . ... Cepheids in NGC 7331 . ... G. P. Di Benedetto . ...

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• ST ScI Preprint #1399
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• The HST Key Project to Measure the Hubble Constant

COLOR PRINT OF NGC 4881 AND PART OF THE SURROUNDING FIELD This photo mosaic, which shows a field of distant galaxies, is a computer enhanced reproduction of a picture taken 4 March 1994 with the repaired Hubble Space Telescope. ... It is a 13th-magnitude elliptical galaxy in the outskirts of the Coma Cluster, a great cluster of galaxies more than 5 times farther away than the Virgo Cluster. ... We must find that peak ("turnover") in NGC 4881 in order to judge the distance. ...

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• http://www.arcetri.astro.it/~palla/ANDREAIMMAGINI/Galassie/CefeidiGalax.txt

This section describes the calculation by which Aristarchus used the duration of a total lunar eclipse to deduce the distance of the Moon. ... This lesson plan supplements: "How Distant is the Moon--1", section #8c: on disk Shipprc2.htm , on the web . ... The shadow of the Earth at the Moon's distance is narrower than the Earth, because the Sun is seen not as a point but as a disk 0.5 degrees wide. ... An eclipse of the Moon is the passage of the Moon through the shadow of the Earth. ...

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• Frames of Reference: The Basics
• Spacecraft that Explore Distant Space
• How Distant is the Moon?--lesson plan #15

... The search for distant objects which can be both galaxies and quasars is one of the most important problems of observational astrphysics, because it allows one to determine cosmological parameters connected with the time of appearence and evolution of stellar systems, large scale structure of the Universe. ... Radio galaxies are important objects to be studied because they are sources of infrared-optical-ultraviolet continuum, emission lines and continual radio emission. ...

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... The greater the distance, the smaller the parallax. ... That triangle has the same proportions as the much larger triangle ABC, and therefore, if the distance B'C to the thumb is 10 times the distance A'B' between the eyes, the distance AC to the far landmark is also 10 times the distance AB. ... The most distant objects our eyes can see are the stars, and they are very far indeed: light which moves at 300,000 kilometers (186,000 miles) per second, would take years, often many years, to reach them. ...

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• Frames of Reference: The Basics
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Blackholes2 Forum Message . ... Distant Galaxy Red Shift Caused By Time Passage Variation. ... If I were falling toward a neutron star or a black hole, a distant galaxy would seem to be accelerating toward me? ... And apparent receding distant galaxies with a red shift. ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

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• Black Holes And RedShift - an Astronomy Net Blackholes Forum Message
• Distant Suns, AstroGuide Listing

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. ...

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• Untitled1
• The High-Z SN Search Description
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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 ? ...

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• http://www.eso.org/~bleibund/papers/Sydney.ps
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Next: Large Scale Clustering in the Universe - A Package of Codes . ... The discovery of a correlation between the light curve shape and intrinsic brightness has made Type Ia supernovae exceptionally accurate distance indicators out to cosmologically interesting redshifts. ... But supernovae are relatively rare events. ... Type Ia supernovae make excellent distance indicators, so these events at high redshift can be used to map out the history of the expanding Universe. ...

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... Currently, there is very little information on comets which are active beyond the orbit of Jupiter. ... Previous observations conducted by our team with the SAO RAS 6-m telescope showed that some of these comets have extended tails dissimilar to the tails of comets forming at close heliocentric distances. ... We for the first time measured the linear polarization of scattered emission for the two distant comets C/2010 S1 (LINEAR) and C/2010 R1 (LINEAR) at heliocentric distances of 5.9-7.0 au. ...

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• Measurement of the dark halo shape in polar ring galaxies
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... 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? ...

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• QSO Absorption Lines and Other Cosmological Probes
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... Spectroscopic studies of time delay of line vs. continuum Technical problem: We have two lightcurves: continuum luminosity line luminosity Line curve is delayed but results from complex repro cessing with unknown transfer function Goal: measuring time delay Spectroscopic studies of time delay of line vs. continuum Past reverberation studies : Our ... 2014) ­ Slepian wavelet variance Can they be effectively used to determine better the time delay from poor...

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• http://hea-www.harvard.edu/AstroStat/Stat310_1011/haiku_ksm_20100927.pdf
• The AstroStat Slog VO
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... Galaxies 95 Optical morphology of distant RATAN-600 radio galaxies T. Pursimo1, K. Nilsson1, P. Teerikorpi1, A. Kopylov2, N. Soboleva3, Yu. ... Galaxies times were from 1200 to 2000 seconds depending on the brightness of the ob ject. ... We show some examples of di erent galaxy morphologies and galaxy environments of RC USS ob jects. ... 1999. ... The absolute magnitude is MR =,20.7, which suggests that the ob ject is slightly fainter than a typical FRI radio galaxy e.g. Colina & De Juan, 1995. ...

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November 2006 Astronotes 1 Candles in the Dark Image Credit: Wikipedia.org By Colin Johnston, Science Communicator Since the mid-ninteenth century astronomers have used the principle of parallax to measure the distance to other stars. ... How then can we tell, for example, that M31, the galaxy in Andromeda, is 2.2 million light years away? It would be straight-forward to tell how far away a star was if it was exactly the same brightness as our own Sun. ...

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• http://www.armaghplanet.com/pdf/AstroTopics/Stars%20and%20Constellations/The%20size%20of%20Space.pdf
• Most distant galaxy ever seen | Astronotes
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... P1103 Date Received: 1997-Dec-15 16:59:12 Technical Page Proposal Type: Regular General Category: Pulsars Observation Category: Galactic Total Time Requested: 46 Hours Proposal Title: Pulsar Distance and Galactic Electron Density Determinations via 21 cm Ab- sorption Measurements ABSTRACT: We propose to measure neutral hydrogen absorption spectra of distant pulsars. ... These measurements will be used to calibrate galactic electron density models, which are essential for pulsar population studies. ...

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• http://www.naic.edu/vscience/schedule/tpfiles/WeisbergtagP1329tp.ps
• http://www.naic.edu/~astro/talks/abstracts/kanekar_16feb07.htm
• http://www.naic.edu/vscience/schedule/tpfiles/WeisbergtagP1773tp.ps