One possible way for spiral galaxies to internally evolve would be for gas to flow to the center and form stars in a central disk (pseudo-bulge). ... In this paper we present radial profiles of stellar and 8 ЮМm emission from polycyclic aromatic hydrocarbons (PAHs) for 11 spiral galaxies to investigate whether the interstellar medium in these galaxies contains a central concentration above that expected from the exponential disk. ...

Еще в разделе: (Показать все результаты (>16564) - www.stsci.edu/ )

• The Spectral Energy Distribution of Dust Emission in the Edge-on Spiral Galaxy
• Infrared Spectral Energy Distributions of Nearby Galaxies
• COS Instrument Handbook

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. ...

Еще в разделе: (Показать все результаты (>704) - xray.sai.msu.ru/ )

• Effect of sources evolution on
• Test of the Initial Mass-Ratio Distribution
• Results of calculations

Figure 1: The ux density distribution of confusing sources in the IDV sample for 1.4 GHz. ... N corresponds to the number of confusing sources detected in 101 images of the IDV sample target sources (no beam shape correction applied). 1 (a) 2.4 GHz (b) 4.8 GHz Figure 2: The number distribution of modulation indices,  of the total ux den- sity calculated over the duration of each observing run: May 1994 and August 1994. The distributions of  are shown for (a) 2.4 GHz and (b) 4.8 GHz. ...

Еще в разделе: (Показать все результаты (>13677) - www.atnf.csiro.au/ )

• The spectral energy distribution of PKS 2004-447: a compact steep-spectrum
• An HI selected sample of galaxies -- The HI mass function and the surface
• Finding the Bivariate Brightness Distribution of galaxies from an HI selected

... The distribution of redshifts among the DXRBS FSRQs identified so far (Figure 3) is quite similar to that of the 1 Jy and S4 samples. ... A more thorough comparison will have to await completion of our survey and the convolution of the redshift distribution with the WGACAT sky coverage. As has already been mentioned by Hook et al. (1996), selecting flat-spectrum sources is an efficient way of finding high-redshift, radio-loud quasars. ...

Еще в разделе: (Показать все результаты (>16767) - www.eso.org/ )

• Sample Properties

... Class . ... FRAMES NO FRAMES All Classes . ... FIELD | CONSTR | METHOD . DETAIL: FIELD | ... java.lang.Object ij.plugin.Distribution . ... public class Distribution . ... This plugin implements the Analyze/Distribution command. ... This method is called when the plugin is loaded. void . ... Constructor Detail public Distribution () . ... This method is called when the plugin is loaded. 'arg', which may be blank, is the argument specified for this plugin in IJ_Props.txt. ...

Еще в разделе: (Показать все результаты (>582) - www.astro.louisville.edu/ )

Model Selection Astro193, March 9 Steps in Hypothesis Testing 1/ Set up 2 possible exclusive hypotheses - two models : M0 ­ null hypothesis ­ formulated to be rejected M1 ­ an alternative hypothesis, research hypothesis 2/ Specify a priori the significance level 3/ Choose a test which: - has the required power - approximates the conditions - finds what is needed to obtain the sampling The model with the largest value provides the best description of the data. ...

Еще в разделе: (Показать все результаты (>2536) - hea-www.harvard.edu/ )

• The AstroStat Slog sampling distribution
• The AstroStat Slog distribution
• False Alarms and Aliasing

... Using the central limit theorem, the total noise can be approximated by a Gaussian or normal distribution which has the frequency function : . ... where is the mean intensity of the source. ... In the statistical analysis of the probability distribution of data several estimators based on moments are used. ... For a normal distribution, these moments are and while for a Poisson distribution are and . Besides these moments other estimators are used to describe a distribution e.g. median and mode . ...

Еще в разделе: (Показать все результаты (>2137) - www.sao.ru/ )

• Corrections to the probability distribution
• Some statistical trends and distributions
• EXAMINE/ROMAFOT

... According to the most popular cosmological paradigm, the greater part of the galaxy mass is accumulated in the dark matter halo. ... The polar ring galaxies (PRGs) reveal external rings or disks of gas, dust and stars rotating in a plane roughly perpendicular to the disk of the central galaxy. ... The shape of the dark halo in the model was chosen so as to achieve the best fit to the observed rotation of both galaxies themselves and their polar rings. ... The SPRC-7 galaxy. ...

Еще в разделе: (Показать все результаты (>218) - mavr.sao.ru/ )

• Lack of Dwarf Galaxies in the Local Volume Compared to Conventional Cosmology
• Metagalaxy sector, archive 2002
• Hardware sector, archive 2006

. Pulkovo Observatory of Russian Academy of Sciences is situated . near Saint-Petersburg. It was founded in 1839. 196140, Saint-Petersburg, Pulkovskoye chaussee 65/1 . English version . Russian version . This page has been accessed times since May 1, 1999.

Еще в разделе: (Показать все результаты (>365) - www.gao.spb.ru/ )

• Pulkovo NEO Page: Ephemeris Support

... In brief: the frequency-dependent radiative transfer equation is solved for a dust under assumption of spherically-symmetric geometry for its distribution taking into account particle size distribution and quantum heating effects for the very small dust particles. ... Table: Model parameters for IRAS04296+3429. ... parameter . ... hot dust shell) . ... The best fit to the spectral energy distribution of IRAS04296 is shown by heavy solid line (see Table2 for details concerning parameters of the model...

Еще в разделе: (Показать все результаты (>878) - jet.sao.ru/ )

• Description of algorithm
• harak_e

... In the case of a single pixel of a single image, is the Poisson distribution about the expectation value of the counts due to background, . As described in section 3.2 , we say there is a source present in this pixel if is larger than a cutoff value . ... This value of , minus the expectation due to background , is defined here as the detection sensitivity. Note that this does not mean that a source with an expectation value of counts which is greater than will always be detected. ...

Еще в разделе: (Показать все результаты (>8759) - xmm.vilspa.esa.es/ )

• Input
• Null-hypothesis probability distribution for a weighted sum of Poissonian