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ATLAS FOR STRUCTURAL STUDIES OF SPIRAL GALAXIES
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ATLAS FOR STRUCTURAL STUDIES OF SPIRAL GALAXIES
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The galaxy parameters are compiled in a 66 column table (410 characters wide) that can be down-loaded as a computer-readable 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 galaxy-by-galaxy 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
General Description
Rotation Curves and Surface Brightness Profiles of 304 Bright Spirals
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
1-b/a
The ellipticity of the best-fitting isophote on the disk-dominated 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 flux-weighted 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 r-band Galactic extinction (C96)
Internal extinction
Correction for r-band internal extinction (C96)
Corrected R mag
The corrected r-band 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 B-band magnitude from fully corrected RC3
raw magnitudes. The correction for Galactic extinction follows a
Burstein-Heiles prescription with A_B = 1.45 and our internal correction
uses B_Tcorr = B_T - 1.45*loga/b - loga/b_70.
B-r
Color term. The mean value is B-r = 0.74 +/- 0.23
Blue luminosity
Absolute B-band luminosity in solar units /1E10.
Assumes M_B = 5.41
Blue Luminosity / L*
Absolute B-band luminosity divided by Schecter's L* in the B-band.
I use M*B = -19.5 + 5.*alog10(H0/100), from the Stromlo-APM 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.
Notes
vr = v_0 + v_c * 1+x^b / 1 + x^g^1/g, where
x = r_t/r-r_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 solid-body and flat part
a5 = Gamma sharpness of turnover
a6 = Beta flat curve drop-off index