def obs_to_galcen(ra, dec, dist, pmra, pmdec, rv, ro=_R0, vo=_v0, zo=_z0):
vxvv = np.dstack([ra, dec, dist, pmra, pmdec, rv])[0]
ra, dec = vxvv[:, 0], vxvv[:, 1]
lb = bovy_coords.radec_to_lb(ra, dec, degree=True)
pmra, pmdec = vxvv[:, 3], vxvv[:, 4]
pmllpmbb = bovy_coords.pmrapmdec_to_pmllpmbb(pmra, pmdec, ra, dec, degree=True)
d, vlos = vxvv[:, 2], vxvv[:, 5]
rectgal = bovy_coords.sphergal_to_rectgal(lb[:, 0], lb[:, 1], d, vlos, pmllpmbb[:, 0], pmllpmbb[:, 1], degree=True)
vsolar = np.array([-11.1, 245.7, 7.25])
vsun = vsolar / vo
X = rectgal[:, 0] / ro
Y = rectgal[:, 1] / ro
Z = rectgal[:, 2] / ro
vx = rectgal[:, 3] / vo
vy = rectgal[:, 4] / vo
vz = rectgal[:, 5] / vo
XYZ = np.dstack([X, Y, Z])[0]
vxyz = np.dstack([vx, vy, vz])[0]
Rpz = bovy_coords.XYZ_to_galcencyl(XYZ[:, 0], XYZ[:, 1], XYZ[:, 2], Zsun=zo / ro)
vRvTvz = bovy_coords.vxvyvz_to_galcencyl(vxyz[:, 0], vxyz[:, 1], vxyz[:, 2], Rpz[:, 0], Rpz[:, 1], Rpz[:, 2],
vsun=vsun,
Xsun=1.,
Zsun=zo / ro,
galcen=True)
return XYZ, vxyz, Rpz, vRvTvz
def test_sphergal_to_rectgal():
l,b,d= 90.,0.,1.
vr,pmll,pmbb= 10.,-20./4.74047,30./4.74047
X,Y,Z,vx,vy,vz= bovy_coords.sphergal_to_rectgal(l,b,d,vr,pmll,pmbb,
degree=True)
assert numpy.fabs(X-0.) < 10.**-10., 'sphergal_to_rectgal conversion did not work as expected'
assert numpy.fabs(Y-1.) < 10.**-10., 'sphergal_to_rectgal conversion did not work as expected'
assert numpy.fabs(Z-0.) < 10.**-10., 'sphergal_to_rectgal conversion did not work as expected'
assert numpy.fabs(vx-20.) < 10.**-10., 'sphergal_to_rectgal conversion did not work as expected'
assert numpy.fabs(vy-10.) < 10.**-10., 'sphergal_to_rectgal conversion did not work as expected'
assert numpy.fabs(vz-30.) < 10.**-10., 'sphergal_to_rectgal conversion did not work as expected'
#Also test for degree=False
X,Y,Z,vx,vy,vz= bovy_coords.sphergal_to_rectgal(l/180.*numpy.pi,
b/180.*numpy.pi,
d,vr,pmll,pmbb,
degree=False)
assert numpy.fabs(X-0.) < 10.**-10., 'sphergal_to_rectgal conversion did not work as expected'
assert numpy.fabs(Y-1.) < 10.**-10., 'sphergal_to_rectgal conversion did not work as expected'
assert numpy.fabs(Z-0.) < 10.**-10., 'sphergal_to_rectgal conversion did not work as expected'
assert numpy.fabs(vx-20.) < 10.**-10., 'sphergal_to_rectgal conversion did not work as expected'
assert numpy.fabs(vy-10.) < 10.**-10., 'sphergal_to_rectgal conversion did not work as expected'
assert numpy.fabs(vz-30.) < 10.**-10., 'sphergal_to_rectgal conversion did not work as expected'
#Also test for arrays
os= numpy.ones(2)
XYZvxvyvz= bovy_coords.sphergal_to_rectgal(os*l,os*b,os*d,
os*vr,os*pmll,os*pmbb,
degree=True)
X= XYZvxvyvz[:,0]
Y= XYZvxvyvz[:,1]
Z= XYZvxvyvz[:,2]
vx= XYZvxvyvz[:,3]
vy= XYZvxvyvz[:,4]
vz= XYZvxvyvz[:,5]
assert numpy.all(numpy.fabs(X-0.) < 10.**-10.), 'sphergal_to_rectgal conversion did not work as expected'
assert numpy.all(numpy.fabs(Y-1.) < 10.**-10.), 'sphergal_to_rectgal conversion did not work as expected'
assert numpy.all(numpy.fabs(Z-0.) < 10.**-10.), 'sphergal_to_rectgal conversion did not work as expected'
assert numpy.all(numpy.fabs(vx-20.) < 10.**-10.), 'sphergal_to_rectgal conversion did not work as expected'
assert numpy.all(numpy.fabs(vy-10.) < 10.**-10.), 'sphergal_to_rectgal conversion did not work as expected'
assert numpy.all(numpy.fabs(vz-30.) < 10.**-10.), 'sphergal_to_rectgal conversion did not work as expected'
return None
def test_rectgal_to_sphergal():
#Test that this is the inverse of sphergal_to_rectgal
l,b,d= 90.,30.,1.
vr,pmll,pmbb= 10.,-20.,30.
X,Y,Z,vx,vy,vz= bovy_coords.sphergal_to_rectgal(l,b,d,vr,pmll,pmbb,
degree=True)
lt,bt,dt,vrt,pmllt,pmbbt= bovy_coords.rectgal_to_sphergal(X,Y,Z,
vx,vy,vz,
degree=True)
assert numpy.fabs(lt-l) < 10.**-10., 'rectgal_to_sphergal conversion did not work as expected'
assert numpy.fabs(bt-b) < 10.**-10., 'rectgal_to_sphergal conversion did not work as expected'
assert numpy.fabs(dt-d) < 10.**-10., 'rectgal_to_sphergal conversion did not work as expected'
assert numpy.fabs(vrt-vr) < 10.**-10., 'rectgal_to_sphergal conversion did not work as expected'
assert numpy.fabs(pmllt-pmll) < 10.**-10., 'rectgal_to_sphergal conversion did not work as expected'
assert numpy.fabs(pmbbt-pmbb) < 10.**-10., 'rectgal_to_sphergal conversion did not work as expected'
#Also test for degree=False
lt,bt,dt,vrt,pmllt,pmbbt= bovy_coords.rectgal_to_sphergal(X,Y,Z,
vx,vy,vz,
degree=False)
assert numpy.fabs(lt-l/180.*numpy.pi) < 10.**-10., 'rectgal_to_sphergal conversion did not work as expected'
assert numpy.fabs(bt-b/180.*numpy.pi) < 10.**-10., 'rectgal_to_sphergal conversion did not work as expected'
assert numpy.fabs(dt-d) < 10.**-10., 'rectgal_to_sphergal conversion did not work as expected'
assert numpy.fabs(vrt-vr) < 10.**-10., 'rectgal_to_sphergal conversion did not work as expected'
assert numpy.fabs(pmllt-pmll) < 10.**-10., 'rectgal_to_sphergal conversion did not work as expected'
assert numpy.fabs(pmbbt-pmbb) < 10.**-10., 'rectgal_to_sphergal conversion did not work as expected'
#Also test for arrays
os= numpy.ones(2)
lbdvrpmllpmbbt= bovy_coords.rectgal_to_sphergal(os*X,os*Y,os*Z,
os*vx,os*vy,
os*vz,
degree=True)
lt= lbdvrpmllpmbbt[:,0]
bt= lbdvrpmllpmbbt[:,1]
dt= lbdvrpmllpmbbt[:,2]
vrt= lbdvrpmllpmbbt[:,3]
pmllt= lbdvrpmllpmbbt[:,4]
pmbbt= lbdvrpmllpmbbt[:,5]
assert numpy.all(numpy.fabs(lt-l) < 10.**-10.), 'rectgal_to_sphergal conversion did not work as expected'
assert numpy.all(numpy.fabs(bt-b) < 10.**-10.), 'rectgal_to_sphergal conversion did not work as expected'
assert numpy.all(numpy.fabs(dt-d) < 10.**-10.), 'rectgal_to_sphergal conversion did not work as expected'
assert numpy.all(numpy.fabs(vrt-vr) < 10.**-10.), 'rectgal_to_sphergal conversion did not work as expected'
assert numpy.all(numpy.fabs(pmllt-pmll) < 10.**-10.), 'rectgal_to_sphergal conversion did not work as expected'
assert numpy.all(numpy.fabs(pmbbt-pmbb) < 10.**-10.), 'rectgal_to_sphergal conversion did not work as expected'
return None
def __init__(self,vxvv=None,uvw=False,lb=False,
radec=False,vo=235.,ro=8.5,zo=0.025,
solarmotion='hogg'):
"""
NAME:
__init__
PURPOSE:
Initialize an Orbit instance
INPUT:
vxvv - initial conditions
3D can be either
1) in Galactocentric cylindrical coordinates [R,vR,vT(,z,vz,phi)]
2) [ra,dec,d,mu_ra, mu_dec,vlos] in [deg,deg,kpc,mas/yr,mas/yr,km/s] (all J2000.0; mu_ra = mu_ra * cos dec)
3) [ra,dec,d,U,V,W] in [deg,deg,kpc,km/s,km/s,kms]
4) (l,b,d,mu_l, mu_b, vlos) in [deg,deg,kpc,mas/yr,mas/yr,km/s) (all J2000.0; mu_l = mu_l * cos b)
5) [l,b,d,U,V,W] in [deg,deg,kpc,km/s,km/s,kms]
4) and 5) also work when leaving out b and mu_b/W
OPTIONAL INPUTS:
radec - if True, input is 2) (or 3) above
uvw - if True, velocities are UVW
lb - if True, input is 4) or 5) above
vo - circular velocity at ro
ro - distance from vantage point to GC (kpc)
zo - offset toward the NGP of the Sun wrt the plane (kpc)
solarmotion - 'hogg' or 'dehnen', or 'schoenrich', or value in
[-U,V,W]
OUTPUT:
instance
HISTORY:
2010-07-20 - Written - Bovy (NYU)
"""
if isinstance(solarmotion,str) and solarmotion.lower() == 'hogg':
vsolar= nu.array([-10.1,4.0,6.7])/vo
elif isinstance(solarmotion,str) and solarmotion.lower() == 'dehnen':
vsolar= nu.array([-10.,5.25,7.17])/vo
elif isinstance(solarmotion,str) \
and solarmotion.lower() == 'schoenrich':
vsolar= nu.array([-11.1,12.24,7.25])/vo
else:
vsolar= nu.array(solarmotion)/vo
if radec or lb:
if radec:
l,b= coords.radec_to_lb(vxvv[0],vxvv[1],degree=True)
elif len(vxvv) == 4:
l, b= vxvv[0], 0.
else:
l,b= vxvv[0],vxvv[1]
if uvw:
X,Y,Z= coords.lbd_to_XYZ(l,b,vxvv[2],degree=True)
vx= vxvv[3]
vy= vxvv[4]
vz= vxvv[5]
else:
if radec:
pmll, pmbb= coords.pmrapmdec_to_pmllpmbb(vxvv[3],vxvv[4],
vxvv[0],vxvv[1],
degree=True)
d, vlos= vxvv[2], vxvv[5]
elif len(vxvv) == 4:
pmll, pmbb= vxvv[2], 0.
d, vlos= vxvv[1], vxvv[3]
else:
pmll, pmbb= vxvv[3], vxvv[4]
d, vlos= vxvv[2], vxvv[5]
X,Y,Z,vx,vy,vz= coords.sphergal_to_rectgal(l,b,d,
vlos,pmll, pmbb,
degree=True)
X/= ro
Y/= ro
Z/= ro
vx/= vo
vy/= vo
vz/= vo
vsun= nu.array([0.,1.,0.,])+vsolar
R, phi, z= coords.XYZ_to_galcencyl(X,Y,Z,Zsun=zo/ro)
vR, vT,vz= coords.vxvyvz_to_galcencyl(vx,vy,vz,
R,phi,z,
vsun=vsun,galcen=True)
if lb and len(vxvv) == 4: vxvv= [R,vR,vT,phi]
else: vxvv= [R,vR,vT,z,vz,phi]
self.vxvv= vxvv
if len(vxvv) == 2:
self._orb= linearOrbit(vxvv=vxvv)
elif len(vxvv) == 3:
self._orb= planarROrbit(vxvv=vxvv)
elif len(vxvv) == 4:
self._orb= planarOrbit(vxvv=vxvv)
elif len(vxvv) == 5:
self._orb= RZOrbit(vxvv=vxvv)
elif len(vxvv) == 6:
self._orb= FullOrbit(vxvv=vxvv)
def __init__(self,
vxvv=None,
uvw=False,
lb=False,
radec=False,
vo=235.,
ro=8.5,
zo=0.025,
solarmotion='hogg'):
"""
NAME:
__init__
PURPOSE:
Initialize an Orbit instance
INPUT:
vxvv - initial conditions
3D can be either
1) in Galactocentric cylindrical coordinates [R,vR,vT(,z,vz,phi)]
2) [ra,dec,d,mu_ra, mu_dec,vlos] in [deg,deg,kpc,mas/yr,mas/yr,km/s] (all J2000.0; mu_ra = mu_ra * cos dec)
3) [ra,dec,d,U,V,W] in [deg,deg,kpc,km/s,km/s,kms]
4) (l,b,d,mu_l, mu_b, vlos) in [deg,deg,kpc,mas/yr,mas/yr,km/s) (all J2000.0; mu_l = mu_l * cos b)
5) [l,b,d,U,V,W] in [deg,deg,kpc,km/s,km/s,kms]
4) and 5) also work when leaving out b and mu_b/W
OPTIONAL INPUTS:
radec - if True, input is 2) (or 3) above
uvw - if True, velocities are UVW
lb - if True, input is 4) or 5) above
vo - circular velocity at ro
ro - distance from vantage point to GC (kpc)
zo - offset toward the NGP of the Sun wrt the plane (kpc)
solarmotion - 'hogg' or 'dehnen', or 'schoenrich', or value in
[-U,V,W]
OUTPUT:
instance
HISTORY:
2010-07-20 - Written - Bovy (NYU)
"""
if isinstance(solarmotion, str) and solarmotion.lower() == 'hogg':
vsolar = nu.array([-10.1, 4.0, 6.7]) / vo
elif isinstance(solarmotion, str) and solarmotion.lower() == 'dehnen':
vsolar = nu.array([-10., 5.25, 7.17]) / vo
elif isinstance(solarmotion,str) \
and solarmotion.lower() == 'schoenrich':
vsolar = nu.array([-11.1, 12.24, 7.25]) / vo
else:
vsolar = nu.array(solarmotion) / vo
if radec or lb:
if radec:
l, b = coords.radec_to_lb(vxvv[0], vxvv[1], degree=True)
elif len(vxvv) == 4:
l, b = vxvv[0], 0.
else:
l, b = vxvv[0], vxvv[1]
if uvw:
X, Y, Z = coords.lbd_to_XYZ(l, b, vxvv[2], degree=True)
vx = vxvv[3]
vy = vxvv[4]
vz = vxvv[5]
else:
if radec:
pmll, pmbb = coords.pmrapmdec_to_pmllpmbb(vxvv[3],
vxvv[4],
vxvv[0],
vxvv[1],
degree=True)
d, vlos = vxvv[2], vxvv[5]
elif len(vxvv) == 4:
pmll, pmbb = vxvv[2], 0.
d, vlos = vxvv[1], vxvv[3]
else:
pmll, pmbb = vxvv[3], vxvv[4]
d, vlos = vxvv[2], vxvv[5]
X, Y, Z, vx, vy, vz = coords.sphergal_to_rectgal(l,
b,
d,
vlos,
pmll,
pmbb,
degree=True)
X /= ro
Y /= ro
Z /= ro
vx /= vo
vy /= vo
vz /= vo
vsun = nu.array([
0.,
1.,
0.,
]) + vsolar
R, phi, z = coords.XYZ_to_galcencyl(X, Y, Z, Zsun=zo / ro)
vR, vT, vz = coords.vxvyvz_to_galcencyl(vx,
vy,
vz,
R,
phi,
z,
vsun=vsun,
galcen=True)
if lb and len(vxvv) == 4: vxvv = [R, vR, vT, phi]
else: vxvv = [R, vR, vT, z, vz, phi]
self.vxvv = vxvv
if len(vxvv) == 2:
self._orb = linearOrbit(vxvv=vxvv)
elif len(vxvv) == 3:
self._orb = planarROrbit(vxvv=vxvv)
elif len(vxvv) == 4:
self._orb = planarOrbit(vxvv=vxvv)
elif len(vxvv) == 5:
self._orb = RZOrbit(vxvv=vxvv)
elif len(vxvv) == 6:
self._orb = FullOrbit(vxvv=vxvv)
def calc_eccentricity(args, options):
table = os.path.join(args[0],'table2.dat')
readme = os.path.join(args[0],'ReadMe')
dierickx = ascii.read(table, readme=readme)
vxvv = np.dstack([dierickx['RAdeg'], dierickx['DEdeg'], dierickx['Dist']/1e3, dierickx['pmRA'], dierickx['pmDE'], dierickx['HRV']])[0]
ro, vo, zo = 8., 220., 0.025
ra, dec= vxvv[:,0], vxvv[:,1]
lb= bovy_coords.radec_to_lb(ra,dec,degree=True)
pmra, pmdec= vxvv[:,3], vxvv[:,4]
pmllpmbb= bovy_coords.pmrapmdec_to_pmllpmbb(pmra,pmdec,ra,dec,degree=True)
d, vlos= vxvv[:,2], vxvv[:,5]
rectgal= bovy_coords.sphergal_to_rectgal(lb[:,0],lb[:,1],d,vlos,pmllpmbb[:,0], pmllpmbb[:,1],degree=True)
vsolar= np.array([-10.1,4.0,6.7])
vsun= np.array([0.,1.,0.,])+vsolar/vo
X = rectgal[:,0]/ro
Y = rectgal[:,1]/ro
Z = rectgal[:,2]/ro
vx = rectgal[:,3]/vo
vy = rectgal[:,4]/vo
vz = rectgal[:,5]/vo
vsun= np.array([0.,1.,0.,])+vsolar/vo
Rphiz= bovy_coords.XYZ_to_galcencyl(X,Y,Z,Zsun=zo/ro)
vRvTvz= bovy_coords.vxvyvz_to_galcencyl(vx,vy,vz,Rphiz[:,0],Rphiz[:,1],Rphiz[:,2],vsun=vsun,Xsun=1.,Zsun=zo/ro,galcen=True)
#do the integration and individual analytic estimate for each object
ts= np.linspace(0.,20.,10000)
lp= LogarithmicHaloPotential(normalize=1.)
e_ana = numpy.zeros(len(vxvv))
e_int = numpy.zeros(len(vxvv))
print('Performing orbit integration and analytic parameter estimates for Dierickx et al. sample...')
for i in tqdm(range(len(vxvv))):
try:
orbit = Orbit(vxvv[i], radec=True, vo=220., ro=8.)
e_ana[i] = orbit.e(analytic=True, pot=lp, c=True)
except UnboundError:
e_ana[i] = np.nan
orbit.integrate(ts, lp)
e_int[i] = orbit.e(analytic=False)
fig = plt.figure()
fig.set_size_inches(1.5*columnwidth, 1.5*columnwidth)
plt.scatter(e_int, e_ana, s=1, color='Black', lw=0.)
plt.xlabel(r'$\mathrm{galpy\ integrated}\ e$')
plt.ylabel(r'$\mathrm{galpy\ analytic}\ e$')
plt.xlim(0.,1.)
plt.ylim(0.,1.)
fig.tight_layout()
plt.savefig(os.path.join(args[0],'dierickx-integratedeanalytice.png'), format='png', dpi=200)
fig = plt.figure()
fig.set_size_inches(1.5*columnwidth, 1.5*columnwidth)
plt.hist(e_int, bins=30)
plt.xlim(0.,1.)
plt.xlabel(r'$\mathrm{galpy}\ e$')
fig.tight_layout()
plt.savefig(os.path.join(args[0], 'dierickx-integratedehist.png'), format='png', dpi=200)
fig = plt.figure()
fig.set_size_inches(1.5*columnwidth, 1.5*columnwidth)
plt.scatter(dierickx['e'], e_int, s=1, color='Black', lw=0.)
plt.xlabel(r'$\mathrm{Dierickx\ et\ al.}\ e$')
plt.ylabel(r'$\mathrm{galpy\ integrated}\ e$')
plt.xlim(0.,1.)
plt.ylim(0.,1.)
fig.tight_layout()
plt.savefig(os.path.join(args[0],'dierickx-integratedee.png'), format='png', dpi=200)
fig = plt.figure()
fig.set_size_inches(1.5*columnwidth, 1.5*columnwidth)
plt.scatter(dierickx['e'], e_ana, s=1, color='Black', lw=0.)
plt.xlabel(r'$\mathrm{Dierickx\ et\ al.}\ e$')
plt.ylabel(r'$\mathrm{galpy\ estimated}\ e$')
plt.xlim(0.,1.)
plt.ylim(0.,1.)
fig.tight_layout()
plt.savefig(os.path.join(args[0],'dierickx-analyticee.png'), format='png', dpi=200)
arr = numpy.recarray(len(e_ana), dtype=[('analytic_e', float), ('integrated_e', float)])
arr['analytic_e'] = e_ana
arr['integrated_e'] = e_int
with open(os.path.join(args[0],'eccentricities.dat'), 'w') as file:
pickle.dump(arr, file)
file.close()
def obs_to_galcen(ra,
dec,
dist,
pmra,
pmdec,
rv,
pmra_err,
pmdec_err,
pmra_pmdec_corr,
dist_err,
rv_err,
return_cov=True,
verbose=True,
return_rphiz=True,
ro=8.,
vo=220.,
zo=0.025,
parallax=False):
vxvv = np.dstack([ra, dec, dist, pmra, pmdec, rv])[0]
ra, dec = vxvv[:, 0], vxvv[:, 1]
lb = bovy_coords.radec_to_lb(ra, dec, degree=True)
pmra, pmdec = vxvv[:, 3], vxvv[:, 4]
pmllpmbb = bovy_coords.pmrapmdec_to_pmllpmbb(pmra,
pmdec,
ra,
dec,
degree=True)
d, vlos = vxvv[:, 2], vxvv[:, 5]
if parallax:
d = 1. / d
rectgal = bovy_coords.sphergal_to_rectgal(lb[:, 0],
lb[:, 1],
d,
vlos,
pmllpmbb[:, 0],
pmllpmbb[:, 1],
degree=True)
vsolar = np.array([-10.1, 4.0, 6.7])
vsun = np.array([
0.,
1.,
0.,
]) + vsolar / vo
X = rectgal[:, 0] / ro
Y = rectgal[:, 1] / ro
Z = rectgal[:, 2] / ro
vx = rectgal[:, 3] / vo
vy = rectgal[:, 4] / vo
vz = rectgal[:, 5] / vo
XYZ = np.dstack([X, Y, Z])[0]
vxyz = np.dstack([vx, vy, vz])[0]
if return_rphiz:
Rpz = bovy_coords.XYZ_to_galcencyl(XYZ[:, 0],
XYZ[:, 1],
XYZ[:, 2],
Zsun=zo / ro)
vRvTvz = bovy_coords.vxvyvz_to_galcencyl(vxyz[:, 0],
vxyz[:, 1],
vxyz[:, 2],
Rpz[:, 0],
Rpz[:, 1],
Rpz[:, 2],
vsun=vsun,
Xsun=1.,
Zsun=zo / ro,
galcen=True)
if return_cov == True:
cov_pmradec = np.empty([len(pmra_err), 2, 2])
cov_pmradec[:, 0, 0] = pmra_err**2
cov_pmradec[:, 1, 1] = pmdec_err**2
cov_pmradec[:, 0, 1] = pmra_pmdec_corr * pmra_err * pmdec_err
cov_pmradec[:, 1, 0] = pmra_pmdec_corr * pmra_err * pmdec_err
if verbose:
print('propagating covariance in pmra pmdec -> pmll pmbb')
cov_pmllbb = bovy_coords.cov_pmrapmdec_to_pmllpmbb(cov_pmradec,
vxvv[:, 0],
vxvv[:, 1],
degree=True,
epoch='J2015')
if verbose:
print('propagating covariance in pmll pmbb -> vx vy vz')
cov_vxyz = bovy_coords.cov_dvrpmllbb_to_vxyz(vxvv[:, 2], dist_err,
rv_err, pmllpmbb[:, 0],
pmllpmbb[:,
1], cov_pmllbb,
lb[:, 0], lb[:, 1])
if not return_rphiz:
return XYZ, vxyz, cov_vxyz
if verbose:
print('propagating covariance in vx vy vz -> vR vT vz')
cov_galcencyl = bovy_coords.cov_vxyz_to_galcencyl(cov_vxyz,
Rpz[:, 1],
Xsun=1.,
Zsun=zo / ro)
return XYZ, vxyz, cov_vxyz, Rpz, vRvTvz, cov_galcencyl
if not return_rphiz:
return XYZ, vxyz
return XYZ, vxyz, Rpz, vRvTvz
def dat_to_galcen(
dat,
return_cov=True,
return_rphiz=True,
verbose=False,
ro=8.,
vo=220.,
zo=0.025,
keys=['ra', 'dec', 'BPG_meandist', 'pmra', 'pmdec', 'VHELIO_AVG'],
cov_keys=[
'pmra_error', 'pmdec_error', 'pmra_pmdec_corr', 'BPG_diststd',
'VERR'
],
parallax=False):
vxvv = np.dstack([dat[keys[i]] for i in range(len(keys))])[0]
ra, dec = vxvv[:, 0], vxvv[:, 1]
lb = bovy_coords.radec_to_lb(ra, dec, degree=True)
pmra, pmdec = vxvv[:, 3], vxvv[:, 4]
pmllpmbb = bovy_coords.pmrapmdec_to_pmllpmbb(pmra,
pmdec,
ra,
dec,
degree=True)
d, vlos = vxvv[:, 2], vxvv[:, 5]
if parallax:
d = 1. / d
rectgal = bovy_coords.sphergal_to_rectgal(lb[:, 0],
lb[:, 1],
d,
vlos,
pmllpmbb[:, 0],
pmllpmbb[:, 1],
degree=True)
vsolar = np.array([-11.1, 245.6,
7.25]) #use SBD10 vR and vZ and SGR proper motion vT
vsun = np.array([
0.,
0.,
0.,
]) + vsolar / vo
X = rectgal[:, 0] / ro
Y = rectgal[:, 1] / ro
Z = rectgal[:, 2] / ro
vx = rectgal[:, 3] / vo
vy = rectgal[:, 4] / vo
vz = rectgal[:, 5] / vo
XYZ = np.dstack([X, Y, Z])[0]
vxyz = np.dstack([vx, vy, vz])[0]
if return_rphiz:
Rpz = bovy_coords.XYZ_to_galcencyl(XYZ[:, 0],
XYZ[:, 1],
XYZ[:, 2],
Zsun=zo / ro)
vRvTvz = bovy_coords.vxvyvz_to_galcencyl(vxyz[:, 0],
vxyz[:, 1],
vxyz[:, 2],
Rpz[:, 0],
Rpz[:, 1],
Rpz[:, 2],
vsun=vsun,
Xsun=1.,
Zsun=zo / ro,
galcen=True)
if return_cov == True:
cov_pmradec = np.array([[[
dat[cov_keys[0]][i]**2,
dat[cov_keys[2]][i] * dat[cov_keys[0]][i] * dat[cov_keys[1]][i]
],
[
dat[cov_keys[2]][i] *
dat[cov_keys[0]][i] * dat[cov_keys[1]][i],
dat[cov_keys[1]][i]**2
]] for i in range(len(dat))])
if verbose:
print('propagating covariance in pmra pmdec -> pmll pmbb')
cov_pmllbb = bovy_coords.cov_pmrapmdec_to_pmllpmbb(cov_pmradec,
vxvv[:, 0],
vxvv[:, 1],
degree=True,
epoch='J2015')
if verbose:
print('propagating covariance in pmll pmbb -> vx vy vz')
cov_vxyz = bovy_coords.cov_dvrpmllbb_to_vxyz(vxvv[:,
2], dat[cov_keys[3]],
dat[cov_keys[4]],
pmllpmbb[:,
0], pmllpmbb[:,
1],
cov_pmllbb, lb[:,
0], lb[:,
1])
if not return_rphiz:
return XYZ, vxyz, cov_vxyz
if verbose:
print('propagating covariance in vx vy vz -> vR vT vz')
cov_galcencyl = bovy_coords.cov_vxyz_to_galcencyl(cov_vxyz,
Rpz[:, 1],
Xsun=1.,
Zsun=zo / ro)
return XYZ, vxyz, cov_vxyz, Rpz, vRvTvz, cov_galcencyl
if not return_rphiz:
return XYZ, vxyz
return XYZ, vxyz, Rpz, vRvTvz
def calc_eccentricity(args, options):
table = os.path.join(args[0], 'table2.dat')
readme = os.path.join(args[0], 'ReadMe')
dierickx = ascii.read(table, readme=readme)
vxvv = np.dstack([
dierickx['RAdeg'], dierickx['DEdeg'], dierickx['Dist'] / 1e3,
dierickx['pmRA'], dierickx['pmDE'], dierickx['HRV']
])[0]
ro, vo, zo = 8., 220., 0.025
ra, dec = vxvv[:, 0], vxvv[:, 1]
lb = bovy_coords.radec_to_lb(ra, dec, degree=True)
pmra, pmdec = vxvv[:, 3], vxvv[:, 4]
pmllpmbb = bovy_coords.pmrapmdec_to_pmllpmbb(pmra,
pmdec,
ra,
dec,
degree=True)
d, vlos = vxvv[:, 2], vxvv[:, 5]
rectgal = bovy_coords.sphergal_to_rectgal(lb[:, 0],
lb[:, 1],
d,
vlos,
pmllpmbb[:, 0],
pmllpmbb[:, 1],
degree=True)
vsolar = np.array([-10.1, 4.0, 6.7])
vsun = np.array([
0.,
1.,
0.,
]) + vsolar / vo
X = rectgal[:, 0] / ro
Y = rectgal[:, 1] / ro
Z = rectgal[:, 2] / ro
vx = rectgal[:, 3] / vo
vy = rectgal[:, 4] / vo
vz = rectgal[:, 5] / vo
vsun = np.array([
0.,
1.,
0.,
]) + vsolar / vo
Rphiz = bovy_coords.XYZ_to_galcencyl(X, Y, Z, Zsun=zo / ro)
vRvTvz = bovy_coords.vxvyvz_to_galcencyl(vx,
vy,
vz,
Rphiz[:, 0],
Rphiz[:, 1],
Rphiz[:, 2],
vsun=vsun,
Xsun=1.,
Zsun=zo / ro,
galcen=True)
#do the integration and individual analytic estimate for each object
ts = np.linspace(0., 20., 10000)
lp = LogarithmicHaloPotential(normalize=1.)
e_ana = numpy.zeros(len(vxvv))
e_int = numpy.zeros(len(vxvv))
print(
'Performing orbit integration and analytic parameter estimates for Dierickx et al. sample...'
)
for i in tqdm(range(len(vxvv))):
try:
orbit = Orbit(vxvv[i], radec=True, vo=220., ro=8.)
e_ana[i] = orbit.e(analytic=True, pot=lp, c=True)
except UnboundError:
e_ana[i] = np.nan
orbit.integrate(ts, lp)
e_int[i] = orbit.e(analytic=False)
fig = plt.figure()
fig.set_size_inches(1.5 * columnwidth, 1.5 * columnwidth)
plt.scatter(e_int, e_ana, s=1, color='Black', lw=0.)
plt.xlabel(r'$\mathrm{galpy\ integrated}\ e$')
plt.ylabel(r'$\mathrm{galpy\ analytic}\ e$')
plt.xlim(0., 1.)
plt.ylim(0., 1.)
fig.tight_layout()
plt.savefig(os.path.join(args[0], 'dierickx-integratedeanalytice.png'),
format='png',
dpi=200)
fig = plt.figure()
fig.set_size_inches(1.5 * columnwidth, 1.5 * columnwidth)
plt.hist(e_int, bins=30)
plt.xlim(0., 1.)
plt.xlabel(r'$\mathrm{galpy}\ e$')
fig.tight_layout()
plt.savefig(os.path.join(args[0], 'dierickx-integratedehist.png'),
format='png',
dpi=200)
fig = plt.figure()
fig.set_size_inches(1.5 * columnwidth, 1.5 * columnwidth)
plt.scatter(dierickx['e'], e_int, s=1, color='Black', lw=0.)
plt.xlabel(r'$\mathrm{Dierickx\ et\ al.}\ e$')
plt.ylabel(r'$\mathrm{galpy\ integrated}\ e$')
plt.xlim(0., 1.)
plt.ylim(0., 1.)
fig.tight_layout()
plt.savefig(os.path.join(args[0], 'dierickx-integratedee.png'),
format='png',
dpi=200)
fig = plt.figure()
fig.set_size_inches(1.5 * columnwidth, 1.5 * columnwidth)
plt.scatter(dierickx['e'], e_ana, s=1, color='Black', lw=0.)
plt.xlabel(r'$\mathrm{Dierickx\ et\ al.}\ e$')
plt.ylabel(r'$\mathrm{galpy\ estimated}\ e$')
plt.xlim(0., 1.)
plt.ylim(0., 1.)
fig.tight_layout()
plt.savefig(os.path.join(args[0], 'dierickx-analyticee.png'),
format='png',
dpi=200)
arr = numpy.recarray(len(e_ana),
dtype=[('analytic_e', float),
('integrated_e', float)])
arr['analytic_e'] = e_ana
arr['integrated_e'] = e_int
with open(os.path.join(args[0], 'eccentricities.dat'), 'w') as file:
pickle.dump(arr, file)
file.close()