Population studies in groups and clusters of galaxies. IV - Comparison of the luminosity functions and morphological-type distributions in seven nearby groups

1991 ◽  
Vol 101 ◽  
pp. 765 ◽  
Author(s):  
Henry C. Ferguson ◽  
Allan Sandage
Keyword(s):  
Population Studies ◽  
Morphological Type ◽  
Clusters Of Galaxies ◽  
Luminosity Functions

Extragalactic X-ray sources and the diffuse X-ray background

1979 ◽  
Vol 366 (1726) ◽  
pp. 391-402 ◽  
Keyword(s):  
Spatial Distribution ◽  
Euclidean Space ◽  
Active Galaxies ◽  
Clusters Of Galaxies ◽  
Optical Identification ◽  
X Ray ◽  
Luminosity Functions ◽  
Sky Survey ◽  
Order Of Magnitude ◽  
X Ray Background

Results from the Ariel 5 sky survey instrument relating to the properties and the spatial distribution of extragalactic X-ray sources are discussed. The lg N -lg S relation for sources in the 2A catalogue is consistent with a uniform distribution of sources in Euclidean space. In addition, measure­ments of fluctuations in the X-ray background suggest that the Euclidean form of the source counts can be extrapolated to flux levels at least an order of magnitude fainter than the 2A catalogue limit. Information is also available from the optical identification of 2A sources which, through redshift measurements, enables the X-ray luminosity functions of the two main classes of source, namely clusters of galaxies and active galaxies, to be determined. The luminosity functions can be used to calculate the contribution of clusters of galaxies and active galaxies to the diffuse X-ray background in the 2-10 keV range. It is found that cosmological evolution of one or both populations is required to account for the diffuse X-ray background entirely in terms of the integrated emission from these sources.

X-ray luminosity functions of clusters of galaxies

1991 ◽  
Vol 366 ◽  
pp. L61 ◽  
Author(s):  
A. Cavaliere ◽  
R. Burg ◽  
R. Giacconi
Keyword(s):  
Clusters Of Galaxies ◽  
X Ray ◽  
Luminosity Functions

scholarly journals Faint Structures in Low Density Regions of the Nearby Universe

1999 ◽  
Vol 183 ◽  
pp. 256-256
Author(s):  
U. Lindner ◽  
K.J. Fricke ◽  
J. Einasto ◽  
M. Einasto
Keyword(s):  
Large Scale ◽  
Large Scale Structure ◽  
Morphological Type ◽  
High Density ◽  
Low Density ◽  
Clusters Of Galaxies ◽  
Galaxy Distribution ◽  
The Galaxy ◽  
Empty Sphere ◽  
First Time

We present an investigation of the galaxy distribution in the huge underdense region between the Hercules, Coma and Local Superclusters, the so-called Northern Local Void (NLV), using void statistics (for details refer to Lindner et al. this Volume). Reshift data for galaxies and poor clusters of galaxies are available in low and high density regions as well. Samples of galaxies with different morphological type and various luminosity limits have been studied separately and void catalogues have been compiled from three different luminosity limited galaxy samples for the first time. Voids have been found using the empty sphere method which has the potential to detect and describe subtle structures in the galaxy distribution. Our approach is complementary to most other methods usually used in Large–Scale Structure studies.

The Hα Luminosity Functions of Nearby Clusters of Galaxies

2002 ◽  
pp. 419-420
Author(s):  
J. Iglesias-Páramo ◽  
A. Boselli ◽  
J. M. Vílchez ◽  
L. Cortese ◽  
G. Gavazzi
Keyword(s):  
Clusters Of Galaxies ◽  
Luminosity Functions

Differences in the Luminosity Functions of Faint Early-Type and Faint Late-Type Galaxies in Four Nearby Clusters of Galaxies

1995 ◽  
Vol 452 (2) ◽  
Author(s):  
Nobunari Kashikawa ◽  
Kazuhiro Shimasaku ◽  
Masafumi Yagi ◽  
Naoki Yasuda ◽  
Mamoru Doi ◽  
...  
Keyword(s):  
Clusters Of Galaxies ◽  
Early Type ◽  
Late Type ◽  
Luminosity Functions

scholarly journals Evidence for Steep Luminosity Functions in Clusters of Galaxies

1995 ◽  
Vol 450 ◽  
pp. 534 ◽  
Author(s):  
Roberto de Propris ◽  
Christopher J. Pritchet ◽  
William E. Harris ◽  
Robert D. McClure
Keyword(s):  
Clusters Of Galaxies ◽  
Luminosity Functions
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