Characterizing Distant Blue Galaxies with HST Images and Keck Spectra

1996 ◽  
pp. 229-232
Author(s):  
Garth D. Illingworth
Keyword(s):  
Blue Galaxies

scholarly journals The Nature of Faint Radio Sources

1986 ◽  
Vol 7 ◽  
pp. 345-353
Author(s):  
J V Wall ◽  
C R Benn ◽  
G Grueff ◽  
M Vigotti
Keyword(s):  
Elliptical Galaxies ◽  
Aperture Synthesis ◽  
Radio Sources ◽  
Mixed Group ◽  
Blue Galaxies ◽  
Infrared Data

AbstractRadio, optical and infrared data are combined to study the nature of mJy-sources found in the 5C12 aperture-synthesis survey. The optical counterparts are QSOs, giant elliptical galaxies of the 3CR type, and blue galaxies. We find that the blue galaxies are a mixed group; the suggestion of a new blue population of evolving spirals at mJy levels is not supported by our data.

scholarly journals Hubble Space TelescopeSpectroscopy of Four Luminous Compact Blue Galaxies at Intermediate Redshift

2004 ◽  
Vol 128 (4) ◽  
pp. 1541-1551 ◽  
Author(s):  
C. Hoyos ◽  
R. Guzmán ◽  
M. A. Bershady ◽  
D. C. Koo ◽  
A. I. Díaz
Keyword(s):  
Blue Galaxies ◽  
Intermediate Redshift

scholarly journals Distribution of Blue Galaxies in a Merging Cluster of Galaxies Abell 168

1996 ◽  
Vol 111 ◽  
pp. 42 ◽  
Author(s):  
A. Tomita ◽  
F. E. Nakamura ◽  
T. Takata ◽  
K. Nakanishi ◽  
T. Takeuchi ◽  
...  
Keyword(s):  
Cluster Of Galaxies ◽  
Blue Galaxies

Search for Radio Emission from Haro's Blue Galaxies at 9.26 cm

Nature ◽  
1968 ◽  
Vol 219 (5158) ◽  
pp. 1032-1033 ◽  
Author(s):  
E. R. SEAQUIST ◽  
M. B. BELL
Keyword(s):  
Radio Emission ◽  
Blue Galaxies

scholarly journals Low Surface Brightness Galaxies and the Field Galaxy Luminosity Function

1996 ◽  
Vol 171 ◽  
pp. 446-446 ◽  
Author(s):  
D. Sprayberry ◽  
C. D. Impey ◽  
G. D. Bothun ◽  
M. J. Irwin
Keyword(s):  
Surface Brightness ◽  
Luminosity Function ◽  
Substantial Fraction ◽  
Low Surface Brightness ◽  
Blue Galaxies ◽  
Best Fitting ◽  
Redshift Survey ◽  
Low Surface Brightness Galaxies ◽  
Galaxy Luminosity Function ◽  
Field Galaxy

We have developed a catalog of local low surface brightness galaxies (LSBGs) which is selected by objective criteria. We present here a luminosity function (LF) for LSBGs based on that catalog. This LF includes the effects of the completeness corrections to the LSBG catalog, and includes only galaxies with surface brightnesses (22.25 ≤ μB(0) ≤ 24.5) fainter than those included in the CfA Redshift Survey (see Marzke et al. 1994, AJ 108, 437). The best-fitting Schechter function has parameters α = –1.42, M∗B = −18.34, and Φ∗ = 0.0036 h3 Mpc–3 mag–1. Thus, surveys which do not take account of the observational selection bias imposed by surface brightness are missing a substantial fraction of the local galaxies, but, this missed fraction is not large enough to explain the counts of faint blue galaxies observed at moderate redshift.

scholarly journals A method for classification of red, blue, and green galaxies using fuzzy set theory

2020 ◽  
Vol 499 (1) ◽  
pp. L31-L35
Author(s):  
Biswajit Pandey
Keyword(s):  
Fuzzy Sets ◽  
Set Theory ◽  
Fuzzy Set ◽  
Fuzzy Set Theory ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Blue Galaxies ◽  
Boundary Sets ◽  
Red Galaxies

ABSTRACT Red and blue galaxies are traditionally classified using some specific cuts in colour or other galaxy properties, which are supported by empirical arguments. The vagueness associated with such cuts are likely to introduce a significant contamination in these samples. Fuzzy sets are vague boundary sets that can efficiently capture the classification uncertainty in the absence of any precise boundary. We propose a method for classification of galaxies according to their colours using fuzzy set theory. We use data from the Sloan Digital Sky Survey (SDSS) to construct a fuzzy set for red galaxies with its members having different degrees of ‘redness’. We show that the fuzzy sets for the blue and green galaxies can be obtained from it using different fuzzy operations. We also explore the possibility of using fuzzy relation to study the relationship between different galaxy properties and discuss its strengths and limitations.

scholarly journals Determination of Young Population Ages in Cluster Galaxies

1995 ◽  
Vol 164 ◽  
pp. 460-460
Author(s):  
B.M. Poggianti ◽  
G. Barbaro
Keyword(s):  
Star Formation ◽  
Young Stars ◽  
Young Population ◽  
Cluster Galaxies ◽  
Blue Galaxies

The “Butcher–Oemler” effect was originally defined as the excess of blue galaxies observed in distant rich clusters when compared to local counterparts. Subsequent observations revealed that a larger fraction of objects in clusters between 0.1 < z < 1 show signs in their spectra of the presence of young stars, i.e. of a recent (during the last 2 Gyrs) or current burst of star formation.

scholarly journals Supernova Rates

1996 ◽  
Vol 145 ◽  
pp. 1-9 ◽  
Author(s):  
Sidney Van Den Bergh
Keyword(s):  
Luminosity Function ◽  
Historical Data ◽  
Starburst Galaxies ◽  
Early Type ◽  
Late Type ◽  
Interstellar Absorption ◽  
Blue Galaxies ◽  
S0 Galaxies ◽  
Intermediate Redshifts ◽  
Parent Galaxy

Extragalactic supernova rates are reviewed. The main uncertainties in calculated rates are due to (1) the influence of the (still poorly known) luminosity function of supernova of a given type on “control times”, to (2) uncertain corrections for possible inclination - dependent bias in supernova discovery probabilities, and (3) interstellar absorption. The total supernova rate in late-type galaxies is found to be ∼ 2(H0/75)2 supernovae (SNe) per century per 1010LB(ʘ) This is consistent with the rate of 3 SNe per century that is derived from the historical data on Galactic supernovae. It is, however, a source of some concern that none of the three Galactic SNe expected to have occurred during the last century was actually observed!The expansion velocities of SNe Ia are found to correlate strongly with parent galaxy Hubble type. This relation is in the sense that low expansion velocities are only observed for those SNe Ia that occur in early-type galaxies. This suggests that V(exp) correlates with the ages of SNe Ia progenitors. It is speculated that the progenitors of a few SNe Ia with high V(exp) values in E and S0 galaxies were formed during recent starbursts.SNe Ia rates appear to be enhanced in post-starburst galaxies. It is suggested that supernova rates might be quite high in the recently discovered population of faint blue galaxies at intermediate redshifts.

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