Table of Contents

For clarity the Asymmetric Drift
Correction output is split in three: a density, velocity and dispersion
related component. They are linear, but recall they are added (or subtracted)
in quadrature, so we print the sign of the correction as well. See EXAMPLES
below. The three are (many references in the literature with some assumptions
of isotropicity):

adc_D^2 = S^2 dlnD/dlnR adc_V^2 = S^2 (1-dlnV/dlnR) / 2 adc_S_2 = S^2 dS^2/dlnRNormally only the

**in=**- Input table (radius,density,velocity,dispersion). No default.
**out=**- Output file name in
standard
*snapshot(5NEMO)*format. **nbody=**- Number of disk particles [2048]
**rmin=**- Inner disk radius [min radius from table]
**rmax=**- Outer cutoff radius [max radius from table]
**mass=**- Rescale total mass to this?. By default not scaled, if a positive value given, this will be the total mass [1.0]
**seed=**- Usual random number seed, see also
*xrandom(1NEMO)*[0] **sign=**- Sign of Z-angular momentum vector of disk. +1 means counter clock wise. [1]
**adc=t|f**- Produce a table of Asymmetric Drift Corrections. If choosen, a simple ascii
table with 7 columns is printed:
*rad, den (D), vel (V), sig (S), adc_D, adc_V, adc_S, vobs*[f] **mode=**- Select mode of initial conditions. 1: regular
in Radius, but random in Theta.
**nbody=**will be exact. 2: cartesian grid, but keeping within**rmax**.**nbody=**will be approximate. [1]. **sigmaz=**- Scaling
factor by which the vertical velocity dispersions are computed compared
to the (isotropic) planar. Remember this is a toy model. The default is 3D
isotropic, but use
**sigmaz=0**if you want a truly planar disk in all phase space coordinates [1]. **headline=***message*- Text headline for output file [default: not used].

nemoinp 0:5:0.2 | tabmath - - ’exp(-%1),%1/sqrt(1+%1**2),0.1’ > tab1 mktabdisk tab1 . adc=true # R D V S adc_D adc_V adc_S Vobs 0.2 0.818731 0.196116 0.1 -0.0447318 0.0145238 0 0.191498 0.4 0.67032 0.371391 0.1 -0.0632403 0.0261482 0 0.3669 0.6 0.548812 0.514496 0.1 -0.0774612 0.036386 0 0.509931 ... 4.6 0.0100518 0.977176 0.1 -0.214485 0.0690972 0 0.955847 4.8 0.00822975 0.97898 0.1 -0.219031 0.0692244 0 0.956671 5.0 0.00673795 0.980581 0.1 -0.223867 0.0693351 0 0.957199or a colorful plot with various velocity components plotted, and where the V/sigma < 1 in the nuclear region

nemoinp 0.001,0.1:15:0.1 | tabmath - - ’exp(-%1),%1/sqrt(1+%1**2),0.4-0.3*%1/(1+%1)’ > tab2 mktabdisk tab2 . adc=true > tab2.adc tabplot tab2.adc 1 3,4,5,6,7,8 0 16 -0.5 1.1 line=1,1,1,1,1,2 color=3,4,2,3,4,3 ycoord=0 xcoord=1

16-may-2020V0.1 draftedPJT 27-may-2020V0.5 add sigmaz=PJT