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J/A+A/383/30 New UBVRI color distribution in E galaxies (Idiart, 2002)
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New UBVRI colour distributions in E-type galaxies. I. The data.
Idiart T.P., Michard R., de Freitas Pacheco J.A.
<Astron. Astrophys. 383, 30 (2002)>
=2002A&A...383...30I (SIMBAD/NED BibCode)
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ADC_Keywords: Galaxies, photometry ; Photometry, UBVRI
Keywords: Galaxies: elliptical and lenticulars, CD - Galaxies: ISM
Description:
Colour distributions have been obtained for 36 E and 4 SA0 galaxies of
the northern Local Supercluster, observed in 2000/1 at the 120cm
telescope of Observatoire de Haute-Provence: field 11.6'x11.6'; scale
0.68"/pix. The radial profiles of the V magnitude and the colours
U-B, B-V, V-R and V-I, were measured in greatly enlarged radial
ranges, as compared to previous work, and with an improved accuracy.
The colour system is the one of Cousins.
File Summary:
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FileName Lrecl Records Explanation
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ReadMe 80 . This file
table1.dat 56 195 Observing log
table9.dat 99 41 Linear representation of colour against log(r)
table10.dat 58 41 Integrated colours
table11.dat 67 41 External colours
objects.dat 46 41 List of observed galaxies
ngc/* . 41 *Data for named object
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Note on ngc/*: For NGC 3377, ngc3377_20.dat for night of Jan/20/2001,
ngc3377_27.dat for night of Jan/27/2001
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Byte-by-Byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- NGC NGC number
6- 15 A10 "DD/MM/YYYY" ObsDate Date of observing night (start)
19 A1 --- Band [BRUVi] Colour filter
23- 26 A4 --- Frame Code of frame
30- 33 I4 s ExpTime Exposure time
37- 42 F6.3 mag/arcsec2 muSky Sky brightness
45- 48 F4.2 arcsec FWHMo Original stellar FWHM
52- 55 F4.2 arcsec FWHM Final improved FWHM
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Byte-by-Byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- NGC NGC number
6- 9 A4 --- MType Mophological class (1)
11- 12 I2 arcsec rinner Inner radius of fit
14- 16 I3 arcsec router Outer radius of fit
18- 22 F5.3 arcsec r0 Reference radius of fit (log_10)
25- 29 F5.3 mag U-B ?=0.000 U-B at reference r_0 (2)
31- 33 F3.2 mag e_U-B ?=0.000 Probable error in U-B
35- 40 F6.3 --- D(U-B) ?=0.000 Logarithmic gradient of U-B (3)
43- 47 F5.3 mag B-V ?=0.000 B-V at reference r_0
49- 51 F3.2 mag e_B-V ?=0.000 Probable error in B-V
53- 58 F6.3 --- D(B-V) ?=0.000 Logarithmic gradient of B-V (3)
61- 65 F5.3 mag V-R ?=0.000 Cousins V-R at reference r_0
67- 69 F3.2 mag e_V-R ?=0.000 Probable error in V-R
71- 76 F6.3 --- D(V-R) ?=0.000 Logarithmic gradient of V-R (3)
79- 83 F5.3 mag V-I ?=0.000 Cousins V-I at reference r_0
85- 87 F3.2 mag e_V-I ?=0.000 Probable error in V-I
89- 94 F6.3 --- D(V-I) ?=0.000 Logarithmic gradient of V-I (3)
97- 98 A2 --- Dust Dust Visibility Index, 1 to 3 (4)
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Note (1): Subclassification of E galaxies:
diE: disky
boE: boxy
unE: undetermined
Note (2): Non measurable colours in NGC 2974 and 3193, and corresponding
gradients, are replaced by 0.000.
Note (3): Colour gradient D(U-B)=d(U-B)/d(logr) and similar for other colours.
Note (4): An important dust pattern has an index of 3.
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Byte-by-Byte Description of file: table10.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- NGC NGC number
8- 11 F4.2 mag U-Br3 ?=0.000 U-B colour index within r=3" (1)
15- 18 F4.2 mag B-Vr3 ?=0.000 B-V colour index within r=3"
22- 25 F4.2 mag V-Rr3 ?=0.000 Cousins V-R colour index within r=3"
29- 32 F4.2 mag V-Ir3 ?=0.000 Cousins V-I colour index within r=3"
36- 39 F4.2 mag U-Vr3 ?=0.000 U-V colour index within r=3"
43- 46 F4.2 mag U-Vr1.5 ?=0.000 U-V colour index at r=1.5"
50- 53 F4.2 mag V-Rr1.5 ?=0.000 Cousins V-R colour index at r=1.5"
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Note (1): Non measurable colours in NGC 2974 are replaced by 0.000.
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Byte-by-Byte Description of file: table11.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- NGC NGC number
6- 10 F5.2 mag <Vmag> Mean V of colour estimate
13- 17 F5.3 mag U-B ?=0.000 U-B at quoted V (1)
20- 23 F4.2 mag e_U-B ?=0.000 Probable error in U-B
26- 30 F5.3 mag B-V ?=0.000 B-V at quoted V
33- 36 F4.2 mag e_B-V ?=0.000 Probable error in B-V
39- 43 F5.3 mag V-R ?=0.000 Cousins V-R at quoted V
46- 49 F4.2 mag e_V-R ?=0.000 Probable error in V-R
52- 56 F5.3 mag V-I ?=0.000 Cousins V-I at quoted V
59- 62 F4.2 mag e_V-I ?=0.000 Probable error in V-I
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Note (1): Non measurable colours in NGC 2974 and 3193 are replaced by 0.000.
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Byte-by-Byte Description of file: objects.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension (2000) (hours)
4- 5 I2 min RAm Right Ascension (2000) (minutes)
7- 10 F4.1 s RAs Right Ascension (2000) (seconds)
12 A1 --- DE- Declination (2000) (sign)
13- 14 I2 deg DEd Declination (2000) (degrees)
16- 17 I2 arcmin DEm Declination (2000) (minutes)
19- 20 I2 arcsec DEs Declination (2000) (seconds)
23- 25 A3 --- --- [NGC]
27- 30 I4 --- NGC NGC number
33- 46 A14 --- dat File designation (1)
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Note (1): The file designation refer to the files ngcAAAA.dat listed above,
where AAAA is the NGC number. There are two files however for
NGC 3377, fully observed twice.
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Byte-by-Byte Description of files: ngc/*
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Bytes Format Units Label Explanations
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2- 7 F6.2 arcsec r Isophotal radius (1)
9- 14 F6.3 mag/arcsec2 muV V surface brightness at r
17- 21 F5.3 mag U-B U-B colour index at r
24- 28 F5.3 mag B-V B-V colour index at r
31- 35 F5.3 mag V-R Cousins V-R colour index at r
38- 42 F5.3 mag V-I Cousins V-I colour index at r
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Note (1): Isophotal radius, r = (ab)^1/2^ for an ellipse of semi-axis a and b
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Author addresses:
Thais P. Idiart <thais@iagusp.usp.br>
Raymond Michard <Raymond.Michard@obspm.fr>
Jose de Freitas Pacheco <pacheco@obs-nice.fr>
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(End) Raymond Michard [Observ. Paris] 28-Jan-2002