scholarly journals Observations of Faint Field Galaxies

1988 ◽  
Vol 130 ◽  
pp. 221-227
Author(s):  
David C. Koo
Keyword(s):  
Preliminary Analysis ◽  
Galaxy Clustering ◽  
Angular Correlations ◽  
Blue Galaxies ◽  
Number Counts

Number counts, colors, and angular correlations of field galaxies fainter than 20th mag are summarized. Resulting conclusions regarding the presence and nature of luminosity, spectral, and clustering evolution remain controversial. Preliminary analysis of two major spectroscopic surveys near completion suggests that by z ∼ 0.5, larger numbers of very-blue galaxies of moderate luminosities are found than today. These skewer-like surveys also provide new probes of galaxy clustering on scales previously unexplored (>200 Mpc) and over lookback times of several billion years.

scholarly journals Clustering Properties of Faint Blue Galaxies

1998 ◽  
Vol 179 ◽  
pp. 337-338
Author(s):  
M.W. Kümmel ◽  
S.J. Wagner
Keyword(s):  
Near Infrared ◽  
Diagnostic Tools ◽  
Theoretical Predictions ◽  
Blue Galaxies ◽  
Excess Density ◽  
Number Counts

Log N - log S diagrams are being used as powerful diagnostic tools to probe evolutionary properties of different extragalactic populations. In the optical/near-infrared regime the discrepancy between near-infrared number counts which follow theoretical predictions and counts in the B band which show an excess density revealed a new population of galaxies. The nature of this population of faint blue galaxies is still unknown.

scholarly journals Combining cluster number counts and galaxy clustering

2016 ◽  
Vol 2016 (08) ◽  
pp. 005-005 ◽  
Author(s):  
Fabien Lacasa ◽  
Rogerio Rosenfeld
Keyword(s):  
Cluster Number ◽  
Galaxy Clustering ◽  
Number Counts

scholarly journals Updated results on the galaxy–halo connection from satellite kinematics in SDSS

2019 ◽  
Vol 487 (3) ◽  
pp. 3112-3129 ◽  
Author(s):  
Johannes U Lange ◽  
Frank C van den Bosch ◽  
Andrew R Zentner ◽  
Kuan Wang ◽  
Antonio S Villarreal
Keyword(s):  
Dark Matter ◽  
Radial Profile ◽  
Sloan Digital Sky Survey ◽  
Galaxy Clustering ◽  
Sky Survey ◽  
The Galaxy ◽  
Blue Galaxies ◽  
Galaxy Halo ◽  
Satellite Galaxies ◽  
The Relationship

ABSTRACT We present new results on the relationship between central galaxies and dark matter haloes inferred from observations of galaxy abundances and satellite kinematics in the Sloan Digital Sky Survey (SDSS) DR7. We employ an updated analysis framework that includes detailed mock catalogues to model observational effects in SDSS. Our results constrain the colour-dependent conditional luminosity function of dark matter haloes, as well as the radial profile of satellite galaxies. Confirming previous results, we find that red central galaxies live in more massive haloes than blue galaxies at a fixed luminosity. Additionally, our results suggest that satellite galaxies have a radial profile less centrally concentrated than dark matter but not as cored as resolved subhaloes in dark-matter-only simulations. Compared to previous works using satellite kinematics by More et al., we find much more competitive constraints on the galaxy–halo connection, on par with those derived from a combination of galaxy clustering and galaxy–galaxy lensing. This improvement stems from also modelling the abundance of galaxies as well as a larger sample size and more realistic observational uncertainties. We compare our results on the galaxy–halo connection to other studies using galaxy clustering and group catalogues, showing a reasonable agreement between these different techniques. We discuss future applications of satellite kinematics in the context of constraining cosmology and the relationship between galaxies and dark matter haloes.

scholarly journals Faint Field Galaxy Counts, Colors, and Redshifts

1996 ◽  
Vol 168 ◽  
pp. 201-208 ◽  
Author(s):  
David C. Koo
Keyword(s):  
Galaxy Evolution ◽  
Research Area ◽  
New Directions ◽  
Blue Galaxies ◽  
Number Counts ◽  
Field Galaxy

This paper aims to provide the non-specialist a brief overview and major highlights in the rapidly changing research area of faint field galaxy evolution. Special emphasis is given to number counts, colors, and redshifts more recent than 1992 and their interpretation, both conventional and exotic. We close with previews of new directions that exploit sizes and velocity widths to explore the nature of faint blue galaxies, a puzzle that has defied solution for 15 years. The mystery continues.

scholarly journals Galaxy Evolution from Deep Galaxy Counts

1995 ◽  
Vol 164 ◽  
pp. 311-319
Author(s):  
J. P. Gardner
Keyword(s):  
Survey Data ◽  
Galaxy Evolution ◽  
Elliptical Galaxy ◽  
Galaxy Surveys ◽  
Blue Galaxies ◽  
Redshift Survey ◽  
The Absolute ◽  
Number Counts ◽  
Luminosity Evolution ◽  
Band Number

We present deep galaxy number counts and colours of K – band selected galaxy surveys. We argue that primeval galaxies are present within the survey data, but have remained unidentified. There are few objects with the colours of an L∗ elliptical galaxy at a redshift of z ≈ 1, in contradiction to standard luminosity evolution models. We present K – band photometry of the objects in a spectroscopic redshift survey selected at 21 < B < 22.5. The absolute K magnitudes of the galaxies are consistent with the no-evolution or pure luminosity evolution models. The excess faint blue galaxies seen in the B – band number counts at intermediate magnitudes are a result of a low normalization, and do not dominate the population until B ≈ 25. Extreme merging or excess dwarf models are not needed at z < 1.

FeXIV Line Emission Polarization of the July 11, 1991 Solar Corona

1994 ◽  
Vol 144 ◽  
pp. 541-547
Author(s):  
J. Sýkora ◽  
J. Rybák ◽  
P. Ambrož
Keyword(s):  
High Resolution ◽  
Solar Corona ◽  
Emission Line ◽  
Solar Eclipse ◽  
White Light ◽  
Preliminary Analysis ◽  
Line Emission ◽  
Total Solar Eclipse ◽  
Degree Of Polarization ◽  
High Resolution Images

AbstractHigh resolution images, obtained during July 11, 1991 total solar eclipse, allowed us to estimate the degree of solar corona polarization in the light of FeXIV 530.3 nm emission line and in the white light, as well. Very preliminary analysis reveals remarkable differences in the degree of polarization for both sets of data, particularly as for level of polarization and its distribution around the Sun’s limb.

AAC Supports for Individuals With Rett Syndrome Across the Lifespan

2015 ◽  
Vol 24 (3) ◽  
pp. 74-85
Author(s):  
Sandra M. Grether
Keyword(s):  
Rett Syndrome ◽  
Communication Skills ◽  
Preliminary Analysis ◽  
Multidisciplinary Approach ◽  
Motor Deficits ◽  
Complex Profile ◽  
Communication Behaviors ◽  
The Individual

Individuals with Rett syndrome (RS) present with a complex profile. They benefit from a multidisciplinary approach for diagnosis, treatment, and follow-up. In our clinic, the Communication Matrix © (Rowland, 1990/1996/2004) is used to collect data about the communication skills and modalities used by those with RS across the lifespan. Preliminary analysis of this data supports the expected changes in communication behaviors as the individual with RS ages and motor deficits have a greater impact.

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