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J/A+A/323/337 Abell 851 morphological segregation (Andreon+ 1997)
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The morphological segregation of galaxies in clusters.
III. The distant cluster Cl 0939+4713 (Abell 851)
Andreon S., Davoust E., Heim T.
<Astron. Astrophys. 323, 337 (1997)>
=1997A&A...323..337A (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, galaxy ; Galaxies, photometry
Keywords: Galaxies: fundamental parameters; luminosity function, mass function;
evolution; cluster: individual: Cl 0939+4713 (Abell 851) -
cluster: individual: Coma cluster
Abstract:
We have performed an isophotal analysis of galaxies in the distant
(z=0.4) cluster Cl0939+4713 (Abell 851), using post-refurbished Hubble
Space Telescope images. Morphological type estimates for the galaxies
are given. A rigorous comparison of the properties of the types shows
that early-type galaxies in Cl0939+4713 are, within the present
statistical or systematic errors, indistinguishable from their
counterparts in Coma in all their studied properties, namely
ellipticity profile, slope of the color-magnitude relation from the
near-ultraviolet to the near-infrared colors, mean surface brightness
and luminosity function in the restframe photographic J band,
homogeneity in color (around the color-magnitude relation).
Furthermore ellipticals and lenticulars are separately homogeneous in
their mean surface brightness, and have similar relative mean surface
brightnesses in both clusters. Spirals are overabundant in Cl0939+4713
with respect to Coma, but twice less than previously estimated, and
are more similar to field spirals than to cluster spirals. We suggest
that the differences in the photometric properties of the spirals in
the two clusters arise from differences in cluster gas density
distribution which ultimately bring star formation in the spirals to a
stop in Coma, but not in Cl0939+4713. The morphological types are
segregated along a privileged direction that coincides with the
position angle of the major axis of the outer X-ray isophotes in the
cluster, just like in Coma and Perseus.
Objects:
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RA (2000) DE Designation(s)
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09 42.8 +47 00 ACO 851 = Cl 0939+4713
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 76 74 *Photometric parameters and classification of
the galaxies in the sample
table1.tex 217 99 TeX version of table1
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Note on table1: When parameters have not been measured or specific morphological
components have not been studied, the relevant codes are replaced by blanks.
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See also:
<J/A+AS/116/429> : Classification of Coma early galaxies (Andreon+ 1996)
Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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2- 4 I3 --- No No in the Dressler & Gunn (1992) catalogue
Cat. <J/ApJS/78/1>
6- 9 F4.1 arcsec log(Rad) ? logarithm of the approximate effective radius
12- 13 A2 --- Dphot Photometric evidence for a disk (1)
15- 18 F4.2 --- b/a ? Typical axis ratio, either its minimum value,
if clearly defined, or its value at the
effective isophote in other cases
21- 22 A2 --- Loc(b/a) Location where the typical axis ratio was
estimated (2)
24- 27 F4.1 % e4 ? Typical e4 parameter, either its extremum
value, if clearly defined, or its value at
the effective isophote in other cases.
30- 31 A2 --- Loc(ce4) Location where e_4 was estimated (2)
33- 36 F4.2 --- b/aE ? Axis ratio in the envelope, i.e. at the
isophote F702W~25mag/arcsec+2
39- 40 I2 deg Amp ? Amplitude of isophotal twist in the range
of reliable measurements.
41 A1 --- n_Amp [:n] Note on amplitude (3)
42- 45 A4 --- Bar Detection of a bar (4)
47- 50 A4 --- Disk Detection and classification of a disk (5)
52- 55 A4 --- Spiral Detection of a spiral pattern (6)
58- 60 A3 --- Envelop Classification of an envelope (7)
65- 71 A7 --- MType morphological classification (8)
76 A1 --- Note [*] An asterisk refers to notes about specific
features such as important dust pattern, ring
or lens, low SuBr, f4-asymmetry, etc. and
about uncertainties of various sources (9)
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Note (1): st strong, cl clear, ft faint, no none
Note (2): ex for the extremum,
re for the effective isophote,
co if the value is the same at both locations
Note (3): ':' : uncertainty flag
n : when the twist is difficult to be measured, as the isophotes
are nearly circular
Note (4): bar: bar seen
bar?: bar suspected
no: no bar seen
Note (5): emDi: embedded disk
miDi: mixed disk
exDi: extended disk
?Di: detected but unclassified disk
no: no disk seen
Note (6): spiP: spiral pattern seen
spiP?: spiral pattern suspected
no: no spiral pattern seen
Note (7): spH: spheroidal halo
thD: thick disk
exD: extended disk
pec: peculiar envelope
? : unclassified envelope
Note (8): boE: boxy E
unE: undetermined E
diE: disky E
SA0, SAB0, SB0, Sa, ...: as usual
S: spiral of unknown stage
SB..: barred spiral of unknown stage
unre: unresolved
Note (9): Individual notes:
137: roundish galaxy, pear-shaped at intermediate radii, large twist in the
envelope. SA0 galaxy with dust unresolved?
138: very irregular isophotes.
150: asymmetric in the outer regions.
190: irregular isophotes.
191: warp.
211: probably barred.
215: possible error of Dressler et al. (1994) in HST WF-PC1 identification.
225: irregular isophotes, HII regions.
269: uncertain type, because near the edge of the image.
292: more concentrated than DG 385.
293: arms and HII regions.
294: HII regions.
299: outer irregular isophotes.
302: difficult case, r^1/4^ SuBr profile, boxy if anything.
310: various clumps superposed.
311: interacting, dust, ring.
312: arms and HII regions.
316: arms and HII regions.
318: within the halo of DG 311 - tidal extension.
320: arms, HII regions and dust.
329: HII regions, dust.
339: pear-shaped isophotes (e3,f3{dif}0) at the r_e.
348: arms - beautiful spiral, HII regions.
360: edge-on, warped.
363: tail at low subr, difficult classification due to the smallness of the
galaxy.
365: pear-shaped at low SuBr, nearby straight object (arclet?) and a
galaxy at 1".
366: boxy bulge, f4 asymmetry.
367: boxy inside 1 arcsec.
371: arm, HII regions.
375: strange companion galaxy(?).
377: larger component of pair probably unresolved from WF1.
383: arms.
384: S? irregular isophotes - dust?
385: r^1/4^ profile, unresolved.
393: near the edge of the image.
397: superposed stars probably explain WF1 classification.
400: roundish galaxy.
408: slight evidence for a disk.
409: elongated galaxy with flat profile.
413: roundish galaxy with r^1/4^ profile, irregular outer isophotes, and
constant positive e4.
422: non-concentric isophotes, tidal extension, possibly interacting
with DG 439.
431: the companion galaxy DG 436 shows disturbances.
432: r^1/4^ profile but asym. isophotes similar to the GMP 1646 irregular
galaxy in Coma, difficult classification.
434: irregular asymmetric.
436: possibly interacting with DG 431, tidal extension, irregular isophotes,
halo offcentered.
439: arms and dust.
441: edge-on, type uncertain because small asymmetry points toward S.
448: faint galaxy.
451: HII regions, possibly interacting with DG 458 because common envelope.
454: asymmetric.
457: face-on, two-component galaxy (bulge+disk).
458: roundish object, possibly interacting with DG 451.
462: irregular isophotes.
471: dust.
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Acknowledgements: Andreon Stefano <andreon@cerere.na.astro.it>
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(End) Patricia Bauer [CDS] 03-Dec-1996