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J/A+A/383/30        New UBVRI color distribution in E galaxies    (Idiart, 2002)

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
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 2000/2001 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:
FileName Lrecl Records Explanations
ReadMe 80 . This file objects.dat 46 41 List of observed galaxies 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 ngc/* 42 41 *Data for named object
Note on ngc/*: For NGC 3377, there are the files ngc3377_20.dat for night of Jan/20/2001, ngc3377_27.dat for night of Jan/27/2001
Byte-by-byte Description of file: objects.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Right Ascension (J2000) (hours) 4- 5 I2 min RAm Right Ascension (J2000) (minutes) 7- 10 F4.1 s RAs Right Ascension (J2000) (seconds) 12 A1 --- DE- Declination (J2000) (sign) 13- 14 I2 deg DEd Declination (J2000) (degrees) 16- 17 I2 arcmin DEm Declination (J2000) (minutes) 19- 20 I2 arcsec DEs Declination (J2000) (seconds) 23- 25 A3 --- --- [NGC] 27- 30 I4 --- NGC NGC number 33- 46 A14 --- FileName File designation, in "ngc" subdirectory (1)
Note (1): The file designation are written ngcAAAA.dat, where AAAA is the NGC number. There are two files however for NGC 3377, fully observed twice.
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
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
Byte-by-byte Description of file: table9.dat
Bytes Format Units Label Explanations
1- 4 I4 --- NGC NGC number 6- 9 A4 --- MType Morphological 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)
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.
Byte-by-byte Description of file: table10.dat
Bytes Format Units Label Explanations
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"
Note (1): Non measurable colours in NGC 2974 are replaced by 0.000.
Byte-by-byte Description of file: table11.dat
Bytes Format Units Label Explanations
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
Note (1): Non measurable colours in NGC 2974 and 3193 are replaced by 0.000.
Byte-by-byte Description of file: ngc/*
Bytes Format Units Label Explanations
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
Note (1): Isophotal radius, r = (ab)1/2 for an ellipse of semi-axis a and b
Author addresses: Thais P. Idiart Raymond Michard Jose de Freitas Pacheco
(End) Raymond Michard [Observ. Paris] 28-Jan-2002
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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