ATLAS FOR STRUCTURAL STUDIES OF SPIRAL GALAXIES

The galaxy parameters are compiled in a 66 column table (410 characters wide) that can be downloaded as a computerreadable ASCII file called courteau99.dat. Column identification is given below, or you can also print the file courteau99.readme. The data table combines information published in Tables 4 and 3 of Courteau (1996) and Courteau (1997), respectively. Please take the time to familiarize yourself with these papers before using this data base. The selection criteria of this sample are described in Courteau (1996).
The entire graphical library of individual luminosity profiles and rotation curves can be retrieved as two single tar files (data_rotation.tar & data_photometry.tar). The ASCII profiles can be retrieved on a galaxybygalaxy basis (using the Preview system, P, within the catalogue search page).
These data are made available to the community for public use. These should be referred to as "The spiral galaxy data base of Courteau (1996, 1997)."
Main references:
For more questions, or comments, about the database, please contact courteau@queensu.ca We would also appreciate new references of papers using these data.
The database Web architecture was designed by Daniel Durand of the CADC/NRC.
(These are the main publications that describe the MarkIII Catalog of Galaxy Peculiar Velocities. Many other investigations have made use of the Mark III data base but are not listed here).
Secular Evolution and Bulde/Disk Decompositions
Mass Modelling and Maximal Disks
Field Name  Description 
UGC  The galaxy UGC number. The last two entries refer to CGCG reference number 
# Rotation Curves  n, the total number of spectroscopic observations per galaxy 
# Brightness profiles  n, the total number of brightness profiles observations per galaxy 
1b/a  The ellipticity of the bestfitting isophote on the diskdominated part of the galaxy profile (see C96) 
Inclination  Inclination computed with an intrinsic flattening, q0 = 0.18 
Heliocentric Velocity  Heliocentric redshift in km/sec. Defined as the center of symmetry of the rotation curve as measured with Model 2 (see C97)) 
Local group velocity  Radial velocity corrected for motion with respect to the Local Group. vlg = vhel  79 cos(l)cos(b) + 296 sin(l)cos(b)  36 sin(b) (Courteau & van den Bergh 1999) 
CMB velocity  Radial velocity in the frame of the Cosmic Microwave Background. The correction uses the motion of the Sun with respect to the CMB frame determined by the COBE dipole anisotropy (Kogut etal 1993) 
Delta V15  Velocity width measured from the fluxweighted rotation profile at 15% of the total area 
log(Delta V15) 2.5  log(Delta V15)  2.5 
Delta V20  Same as Delta V15 but measured at 20% of the total area 
log(Delta V20)  2.5  
Vmax  Maximum velocity of RC model 2 (as in C97) 
log(Vmax)  2.5  
Vdisk = V2.2  Velocity measured from Model 2 at 2.15 disk scalelengths (peak velocity for pure disk) 
log(Vdisk)  2.5  
Viso  "Isophotal" velocity measured from Model 2 at the isophotal level of 23 mag/arcsec^{2} 
log(Viso)  2.5  
Vopt = V3.2  Velocity from Model 2 measured at r_opt = 3.2h (optical radius as defined by Persic & Salucci) 
log(Vopt)  2.5  
Whist  Velocity difference between the 10th and 90th (interpolated) percentile points in the ranked distribution of velocities 
log(Whist)  2.5  
log_slope (model)  Mean logslope dlogv/dlogr from Model 2 using bootstrap least square fits between r_disk (=2.15h) and the last fitted velocity point 
log(slope (data)  Logslope measured from the observed RC between r_disk and the last measured velocity point 
log_slope (23)  Logslope measured from the observed RC between r_disk and 3 exponential disk scale lengths 
Sampled points (23)  Number of points used to bootstrap log_slope(23) 
Standard deviation (23)  One sigma deviation for the 100 random realizations in log_slope(23) 
log_slope (24)  Logslope measured from the observed RC between r_disk and 4 exponential disk scale lengths 
Sampled points (24)  Number of points used to bootstrap log_slope(24) 
Standard deviation (24)  One sigma deviation for the 100 random realizations in log_slope(24) 
Radius @ R23  The corrected radius at the 23 r mag arcsec^{2} isophote in kpc. Isophotal radii are corrected for both Galactic extinction effects and cosmological stretch (as in C96). The transformation to kpc assumes a distance from the vlg redshift and a Hubble constant of 70 km/sec/Mpc 
Radius @ R24  Analogous to previus entry 
Radius @ R25  Analogous to previous entry 
Rotation curve max extent in kpc  The maximum extent in kpc from the last measured detection on either side of the RC 
Rotation curve max extent in arcsec  Same as previous but expressed in arcsec 
Scale length in arcsec  The corrected scalelength in arcsec. Values from Broeils, A. & Courteau, S. 1997 (1D B/D) were adopted when available. All scale lengths are corrected for cosmological stretch. Galactic extinction is irrelevant 
Scale length in kpc  The corrected disk scale length in kpc 
RC max extent / R3.2  The maximum RC extent of the RC divided by the optical radius measured at 3.2 disk scale length 
RC max extent / Scale length  The maximum extent of the RC divided by the disk scale length 
RC peak radius / Scale length  Radius where the rotation curve peaks (often last point of RC) divided by the disk scale length 
Rmag @ SB23  The corrected apparent magnitude at the 23 mag arcsec^{2} level. Isophotal and total magnitudes are corrected for Galactic reddening (abcor) and internal extinction (extcor) (see C96) 
Rmag @ SB24  The corrected apparent magnitude at the 24 mag arcsec^{2} level 
Rmag @ SB25  The corrected apparent magnitude at the 25 mag arcsec^{2} level 
Galactic extinction (Milky Way)  Correction for rband Galactic extinction (C96) 
Internal extinction  Correction for rband internal extinction (C96) 
Corrected R mag  The corrected rband total extrapolated apparent magnitude 
Rmag @ 2.2 scale length  Corrected apparent magnitude measured inside r_disk 
Absolute Rmag @ SB23  Absolute magnitude of fully corrected Rmag23. Absolute magnitudes are computed using LG redshifts and H0=70 
Absolute Rmag @ SB25  Absolute magnitude of fully corrected Rmag25 
Absolute Rmag @ 2.2 scale length  Absolute magnitude of fully corrected rm2.2 
Absolute total Rmag  Absolute magnitude of fully corrected rmag. absmr = rmag  5log D[Mpc] + 25 
Absolute RC3 B mag  Absolute magnitude of Bband magnitude from fully corrected RC3 raw magnitudes. The correction for Galactic extinction follows a BursteinHeiles prescription with A_B = 1.45 and our internal correction uses B_Tcorr = B_T  1.45*loga/b  loga/b_70. 
Br  Color term. The mean value is Br = 0.74 +/ 0.23 
Blue luminosity  Absolute Bband luminosity in solar units /1E10. Assumes M_B = 5.41 
Blue Luminosity / L*  Absolute Bband luminosity divided by Schecter's L* in the Bband. I use M*B = 19.5 + 5.*alog10(H0/100), from the StromloAPM survey. For H0=70, M*B=20.27 and L*=1.88E+10 in solar units 
Disk / Total light  Ratio of fitted disk light to total measured light for the whole galaxy 
Integrated Disk light / Measured Disk light @ 2.2 scale length  Ratio if fitted disk light to measured light inside r_disk 
Central surface brightness  CSB, central surface brightness from disk fits 
Distance (Mpc)  Distance of the galaxy in Mpc, computed as D = vlg/H0 (Inferred TF distances are discarded since peculiar motions are more uncertain than distance errors) 
Conversion from " to kpc  Conversion factor to change arcseconds into kpc 
Exponent in model 2  Exponent term in Model 2 (see function summary below) 
Rt(model 2) / R3.2  Turnaround radius in Model 2 divided by the optical radius 
Freeman type  Freeman Type (I or II) 
Quiet Hubble flow  0/1 if the galaxy is away from/included in the Quiet Hubble flow 
Hubble type  Hubble type. 
vr = v_0 + v_c * 1+x^b / 1 + x^g^1/g, where x = r_t/rr_0 where: a1 = v_0 velocity center a2 = r_0 position center a3 = v_c asymptotic velocity (positive if curve has + slope negative if curve has  slope) a4 = r_t turnover radius between solidbody and flat part a5 = Gamma sharpness of turnover a6 = Beta flat curve dropoff index