J/ApJ/630/784 UBVR observations of nearby galaxies (Taylor+, 2005)
UBVR and Hubble Space Telescope mid-ultraviolet and near-infrared surface photometry and radial color gradients of late-type, irregular, and peculiar galaxies. Taylor V.A., Jansen R.A., Windhorst R.A., Odewahn S.C., Hibbard J.E. <Astrophys. J., 630, 784-803 (2005)> =2005ApJ...630..784T
ADC_Keywords: Galaxies, nearby ; Photometry, UBVRI Keywords: galaxies: fundamental parameters - galaxies: interactions - galaxies: irregular - galaxies: peculiar - galaxies: photometry - galaxies: spiral Abstract: We introduce a data set of 142 mostly late-type spiral, irregular, and peculiar (interacting or merging) nearby galaxies observed in UBVR at the Vatican Advanced Technology Telescope (VATT), and we present an analysis of their radial color gradients. Description: We obtained our ground-based observations at the VATT (Vatican Advanced Technology Telescope) at Mount Graham International Observatory (MGIO; Arizona) with the 2kx2k Direct Imager because of its high sensitivity in the near-UV, which is critical for our ultimate science goals. Observations were spread over nine runs between 1999 April and 2002 April. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 114 568 Observed VATT galaxy list table4.dat 204 138 VATT measured galaxy parameters
See also: J/AJ/100/1091 : UBR photometry of 39 elliptical galaxies (Peletier+ 1990) J/AJ/107/135 : Colors in bulges of galaxies (Balcells+ 1994) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Internal identification number 5- 14 A10 --- Name Galaxy name 16- 17 I2 h RAh Hour of Right Ascension (J2000) 19- 20 I2 min RAm Minute of Right Ascension (J2000) 22- 26 F5.2 s RAs Second of Right Ascension (J2000) 28 A1 --- DE- Sign of the Declination (J2000) 29- 30 I2 deg DEd Degree of Declination (J2000) 32- 33 I2 arcmin DEm Arcminute of Declination (J2000) 35- 38 F4.1 arcsec DEs Arcsecond of Declination (J2000) 40- 43 F4.1 --- TRC3 RC3 morphological classification (Cat. VII/155) 45- 48 F4.1 --- TType Visual morphological classification 50 A1 --- Filt [UBVR] Filter used in the observation 52- 54 F3.1 --- NExp Number of images used in the stack 56- 61 F6.1 s TExp Average image exposure time 63- 67 F5.3 --- sec(z) Average air mass 69- 76 F8.3 --- Sky Median sky background level in ADU 78- 83 F6.3 --- e_Sky Single sky pixel uncertainty 85- 89 F5.2 mag/arcsec2 muSky Sky surface brightnesses 91- 95 F5.3 arcsec Seeing Average seeing estimate 97-101 F5.3 arcsec e_Seeing The 1σ error in Seeing 103-112 A10 "YYYY/MM/DD" ObsDate Date of the first deep stack image 114 A1 --- Phot? [yn] Photometric deep images? (1)
Note (1): Photometric deep images flag, defined as follows: y = Individual deep image was photometric; n = deep image was calibrated with shorter photometric exposures.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Internal identification number 5- 10 F6.2 arcsec D24 Isophotal diameter at R=24mag/arcsec2 12- 16 F5.2 arcsec ReA Angular effective half light R band radius 18- 22 F5.2 kpc ReP ? Physical effective half light R band radius (1) 24- 28 F5.3 --- b/a Axis ratio 30- 34 I5 km/s VGSR ? RC3 (Cat. VII/155) galactic standard of rest velocity 36- 41 F6.3 mag Bmag Total B band apparent magnitude (2) 43- 47 F5.3 mag e_Bmag Error in Bmag (3) 49- 55 F7.3 mag BMAG ? Total B band absolute magnitude 57- 61 F5.3 mag e_BMAG ? Error in BMAG (4) 63- 68 F6.3 mag U-B Average total (U-B) color index 70- 74 F5.3 mag e_U-B Error in U-B (5) 76- 81 F6.3 mag B-V Average total (B-V) color index 83- 87 F5.3 mag e_B-V Error in B-V (5) 89- 94 F6.3 mag V-R Average total (V-R) color index 96-100 F5.3 mag e_V-R Error in V-R (5) 102-107 F6.3 mag/arcsec2 Bmu B band surface brightness within ReA 109-113 F5.3 mag/arcsec2 e_Bmu Error in Bmu 115-120 F6.3 mag/arcsec2 (U-B)mu Average (U-B) surface brightness within ReA 122-126 F5.3 mag/arcsec2 e_(U-B)mu Error in (U-B)mu (5) 128-133 F6.3 mag/arcsec2 (B-V)mu Average (B-V) surface brightness within ReA 135-139 F5.3 mag/arcsec2 e_(B-V)mu Error in (B-V)mu (5) 141-146 F6.3 mag/arcsec2 (V-R)mu Average (V-R) surface brightness within ReA 148-152 F5.3 mag/arcsec2 e_(V-R)mu Error in (V-R)mu (5) 154-159 F6.3 mag/arcsec (U-R)grad ? The (U-R) color gradient (6) 161-165 F5.3 mag/arcsec e_(U-R)grad ? Error in (U-R)grad (7) 167-172 F6.3 mag/arcsec (U-B)grad ? The (U-B) color gradient (6) 174-178 F5.3 mag/arcsec e_(U-B)grad ? Error in (U-B)grad (7) 180-185 F6.3 mag/arcsec (B-V)grad ? The (B-V) color gradient (6) 187-191 F5.3 mag/arcsec e_(B-V)grad ? Error in (B-V)grad (7) 193-198 F6.3 mag/arcsec (V-R)grad ? The (V-R) color gradient (6) 200-204 F5.3 mag/arcsec e_(V-R)grad ? Error in (V-R)grad (7)
Note (1): Using H0 = 71km/s/Mpc. Note (2): Derived from extrapolating the surface brightness profile to infinity. Note (3): Derived from the total signal-to-noise in the largest aperture measured. Note (4): Includes the uncertainty on H0 from WMAP measurements. Note (5): Errors on the total and effective colors, (X-Y), are the quadratic sum of the respective total X and Y magnitude errors. Note (6): Outside of ReA and measured by finding the slope of the linear fit to the color profile for all good points outside of ReA in units of Δmag per ReA. A negative slope indicates the galaxy becomes bluer with increasing radius, and a positive slope indicates that it is gets redder outward. Note (7): Error is the accidental error derived from Equation 1. The errors on the color gradients were determined from the scatter of the fits.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 18-May-2006
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