J/MNRAS/433/L30 Velocity gradient and brightness in disc galaxies (Lelli+ 2013) ================================================================================ A scaling relation for disc galaxies: circular-velocity gradient versus central surface brightness. Lelli F., Fraternali F., Verheijen M. =2013MNRAS.433L..30L ================================================================================ ADC_Keywords: Galaxies, rotation Keywords: galaxies: kinematics and dynamics - galaxies: structure - dark matter Abstract: For disc galaxies, a close relation exists between the distribution of light and the shape of the rotation curve. We quantify this relation by measuring the inner circular-velocity gradient d_R_V(0) for spiral and irregular galaxies with high-quality rotation curves. We find that d_R_V(0) correlates with the central surface brightness {mu}_0_ over more than two orders of magnitude in d_R_V(0) and four orders of magnitudes in {mu}_0_. This is a scaling relation for disc galaxies. It shows that the central stellar density of a galaxy closely relates to the inner shape of the potential well, also for low-luminosity and low-surface-brightness galaxies that are expected to be dominated by dark matter. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 87 74 Galaxy sample used refs.dat 93 21 References -------------------------------------------------------------------------------- See also: VII/145 : Nearby Galaxies Catalogue (NBG) (Tully 1988) VII/198 : Mark III Catalog of Galaxy Peculiar Velocities (Willick+ 1997) J/AJ/138/332 : LEDA CMD/tip of the red giant branch (Jacobs+, 2009) J/AJ/112/2471 : The Ursa Major cluster. I. (Tully+ 1996) J/A+A/390/863 : CCD R Photometry of WHISP Dwarf Galaxies (Swaters, 2002) J/ApJ/703/1569 : Radial distribution in SINGS galaxies. I. (Munoz-Mateos+ 2009) J/A+A/370/765 : HI synthesis observations in UMa cluster (Verheijen+, 2001) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 9 A9 --- Name Galaxy name 11- 17 A7 --- Type Morphological type 19- 22 F4.1 Mpc Dist Distance 24- 27 F4.1 Mpc e_Dist rms uncertainty on Dist 29- 35 A7 --- Met Method used for distance determination (1) 37- 38 I2 deg i [0/90] Inclination 40 I1 deg e_i rms uncertainty on Inclination 42- 45 F4.1 mag/arcsec2 SuBr0 ?=- R-band surface brightness 47- 49 F3.1 mag/arcsec2 e_SuBr0 ?=- rms uncertainty on SuBr0 51- 53 I3 km/s Vmax Maximum velocity 55- 56 I2 km/s e_Vmax rms uncertainty on Vmax 58- 61 I4 km/s/kpc dRV(0) ?=- Circular-velocity gradient 63- 66 I4 km/s/kpc e_dRV(0) ?=- rms uncertainty on dRV(0) 68- 71 F4.1 kpc R90 Radius where the rotation curve reaches 90% of its maximum velocity 73- 74 I2 --- m [1/10]?=- Best fitting polynomial order 76- 79 F4.2 --- chi2nu ?=- {chi}^2^ value (per d.o.f.) 81 A1 --- r_Dist Dist reference, in refs.dat file 82 A1 --- --- [,] 84 A1 --- r_SuBr0 SuBr0R reference, in refs.dat file 85 A1 --- --- [,] 87 A1 --- r_dRV(0) dRV(0) reference, in refs.dat file -------------------------------------------------------------------------------- Note (1): Methods as follows: TF = Tully-Fischer relation TRGB = tip of the red giant branch Ceph = Cepheids Cluster = cluster distance Vflow = Hubble flow -------------------------------------------------------------------------------- Byte-by-byte Description of file: refs.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1 A1 --- Ref reference code 3- 21 A19 --- BibCode BibCode 23- 50 A28 --- Aut Author's name 51- 93 A43 --- Com Comments -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Patricia Vannier [CDS] 08-Jul-2014