J/AJ/134/1508 Galaxy morphology catalog (van den Berg+, 2007)
Some musings on galaxy morphology, galactic colors, and the environments of
galaxies.
van den Bergh S.
<Astron. J., 134, 1508-1514 (2007)>
=2007AJ....134.1508V 2007AJ....134.1508V
ADC_Keywords: Galaxy catalogs ; Morphology
Keywords: galaxies: fundamental parameters
Abstract:
Careful inspection of large-scale photographs of Shapley-Ames galaxies
seems to show a smooth transition between the morphological
characteristics of galaxies located on the narrow red and on the broad
blue sequences in the galaxian color-magnitude diagram. In other
words, there does not appear to be a dichotomy between blue and red
galaxies. Both the colors and the morphologies of galaxies are found
to correlate strongly with their environments. Red and early-type
Shapley-Ames galaxies are dominant in clusters, whereas blue late-type
star-forming objects dominate the general field. Interestingly, the
colors and morphologies of galaxies in small groups resemble the field
and differ from those in clusters. As noted by Baade, the presence of
dust and star formation are very closely correlated, except in a few
galaxies that probably had unusual evolutionary histories. Over the
entire range from S0 to Sc there is no significant difference between
the integrated colors of normal and barred objects, suggesting that
the formation of a bar does not significantly affect the stellar
evolutionary history of a galaxy.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 50 800 Catalog of Shapley-Ames galaxies with MB←18.0
for which de Vaucouleurs et al. (RC3, 1991,
Cat. VII/155) list integrated (U-B)0 colors
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See also:
VII/51 : Revised Shapley-Ames Catalog of Bright Galaxies (Sandage+, 1981)
VII/155 : Third Reference Cat. of Bright Galaxies (RC3) (de Vaucouleurs+ 1991)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Galaxy name
10 A1 --- f_Name [*] Flag on Name (1)
12- 13 A2 --- Seq [RB: ] Red or blue sequence
15- 27 A13 --- MType Sandage & Tammann (1981, Cat. VII/51)
morphology classification
29- 34 F6.2 mag BMag ? Total absolute B band magnitude (2)
36- 40 F5.2 mag (U-B)0 Intrinsic (U-B) color index
41 A1 --- u_(U-B)0 Uncertainty flag in (U-B)0 (3)
43- 44 A2 --- Env Environment (4)
46- 47 A2 --- D Estimate of the amount of dust present (5)
49- 50 A2 --- S Estimate of star formation intensity (6)
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Note (1): I am indebted to Dr. Harold Corwin for pointing out that object
"New 5" in the catalog of Sandage & Tammann (VII/51) is probably
identical to IC 4946. The morphological type assigned to NGC 2798
might be questioned NGC 3415 is classified as E5 in Sandage & Tammann
(VII/51) , but as Sb in Sandage & Bedke (1994, The Carnegie Atlas of
Galaxies).
Note (2): Except for Local Group members, the luminosities adopted by
Sandage & Tammann (VII/51) were reduced by 0.73mag so that they are
now based on a Hubble parameter of 70km/s/Mpc, rather than on the
value of 50km/s/Mpc, that was favored by Sandage & Tammann (VII/51).
Note (3): Indicates a galaxy with |b|<25.0 degrees.
Note (4): Environment flag as follows:
F = Field (fewer than three non-dwarf companions)
G = Group (3 to 6 non-dwarf companions)
C = Cluster (more than six non-dwarf companions)
Note (5): Amount of dust present flag as follows:
0 = dust free
1 = trace of dust
2 = dusty
3 = very dusty
Note (6): Star formation intensity as follows:
0 = no star formation
1 = trace of star formation
2 = active star formation
3 = very active star formation
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 31-Oct-2009