id-Dodd23 0.1.9

A package to classify halo stars into Dodd23 groups.

id_Dodd23

A package to identify the group membership of stars, described in (Dodd23)[https://ui.adsabs.harvard.edu/abs/2023A%26A...670L...2D/abstract].

This package has utilities to:

1. Transform from observables to the Galactocentric position-velocity used in Dodd23
2. Calculate IoM used in Dodd23 (Energy, Lz, L perp)
3. Identify the membership of the stars to substructures identified in Dodd23.

See examples notebook.

Groups IoM

Groups are defined.

Groups	Mean [En,Lz,Lperp]	covariance
Gaia Enceladus	[-1.17706147e+05 -3.38085108e+01 4.06814367e+02]	[[1.00254943e+08 1.17355768e+06 7.57200250e+04] [1.17355768e+06 4.35077348e+04 8.02911543e+03] [7.57200250e+04 8.02911543e+03 8.14407020e+04]]
L-RL3	[-1.50778932e+05 1.33687176e+02 5.58893786e+02]	[[7679831.59044808 -145858.99745856 377291.42148388] [-145858.99745856 12856.67646575 -11957.78501425] [ 377291.42148388 -11957.78501425 38941.5587742 ]]
Hot Thick Disk	[-118635.91170409 1337.17346818 393.77690032]	[[ 3.73861048e+07 1.11206925e+06 -2.38946736e+05] [ 1.11206925e+06 3.97429270e+04 -9.63413019e+03] [-2.38946736e+05 -9.63413019e+03 4.36832521e+04]]
Thamnos 1+2	[-146980.67552909 -840.07011806 284.51947309]	[[ 8.51956729e+06 -3.78985605e+05 1.55925840e+04] [-3.78985605e+05 3.18925500e+04 -3.84165842e+03] [ 1.55925840e+04 -3.84165842e+03 1.16255710e+04]]
Helmi Streams	[-106276.74200091 1300.64169873 2031.70955323]	[[ 2.14702450e+07 2.72827187e+04 6.73351386e+05] [ 2.72827187e+04 4.07061487e+04 -1.94021183e+04] [ 6.73351386e+05 -1.94021183e+04 5.37536539e+04]]
Sequoia	[-98691.22180863 -1667.42957456 1282.33628907]	[[29420389.45626034 -548980.90687133 -1569463.77355954] [ -548980.90687133 75817.15063921 49066.08855248] [-1569463.77355954 49066.08855248 257264.44908434]]
ED-1	[-138297.07882812 682.75151468 1178.11935402]	[[ 4.00626265e+06 1.17095303e+05 2.28847426e+04] [ 1.17095303e+05 1.01436869e+04 -1.88667516e+03] [ 2.28847426e+04 -1.88667516e+03 6.67514547e+03]]
Group 7	[-138113.79514352 581.22521973 179.19508445]	[[ 1.30816418e+06 3.81696835e+03 6.05667203e+03] [ 3.81696835e+03 2.62848044e+03 -3.88219995e+01] [ 6.05667203e+03 -3.88219995e+01 3.59654473e+02]]
Group 8	[-1.36153390e+05 8.50693162e+02 7.65603722e+01]	[[2.97512040e+06 7.85460411e+04 4.72189541e+03] [7.85460411e+04 4.63565272e+03 1.32064301e+03] [4.72189541e+03 1.32064301e+03 1.13155571e+03]]
Group 9	[-140891.66013154 608.32531553 341.07955397]	[[6.56271697e+05 2.53204241e+04 1.49318170e+03] [2.53204241e+04 2.23395188e+03 2.89676336e+01] [1.49318170e+03 2.89676336e+01 6.27499761e+02]]
Group 10	[-1.30274218e+05 -9.86221163e+01 6.26632484e+02]	[[ 2.60664420e+06 -3.06581376e+04 1.83486568e+03] [-3.06581376e+04 4.61208856e+03 -1.29997106e+03] [ 1.83486568e+03 -1.29997106e+03 1.03147087e+03]]
L-RL64	[-73883.94956776 -2961.63071547 487.69773871]	[[4944866.71934184 -90610.84654646 -20725.09298218] [ -90610.84654646 35850.57067161 -13088.05021027] [ -20725.09298218 -13088.05021027 20042.14747399]]
Group 12	[-135378.93992392 -160.80711966 555.48385089]	[[ 3.03175327e+05 -9.53145213e+03 -7.92853226e+03] [-9.53145213e+03 1.69561772e+03 -9.22057864e+00] [-7.92853226e+03 -9.22057864e+00 8.00829677e+02]]
Group 13	[-107823.35550489 -207.01229686 1092.343679 ]	[[1609802.97127011 107942.18339433 43287.20740788] [ 107942.18339433 22415.9311162 5025.9524723 ] [ 43287.20740788 5025.9524723 2904.83937229]]
Group 14	[-9.63241824e+04 3.51491621e+00 8.93899585e+02]	[[ 3.62290982e+06 7.20008189e+04 -2.98874780e+04] [ 7.20008189e+04 1.09244272e+04 -1.17139466e+03] [-2.98874780e+04 -1.17139466e+03 1.14438246e+03]]
ED-2	[-101837.20303526 -2249.03982632 912.49613633]	[[ 6.08946249e+06 -1.38327383e+05 2.86674332e+04] [-1.38327383e+05 3.53067742e+03 -2.28415513e+02] [ 2.86674332e+04 -2.28415513e+02 1.96122385e+03]]
Group 16	[-84487.0637682 2164.26996402 1825.90520559]	[[23627511.06889399 464102.3872849 -722561.19984759] [ 464102.3872849 62147.93302771 -41419.75188345] [ -722561.19984759 -41419.75188345 66736.84379981]]
ED-4	[-71562.75066862 1011.80963274 2507.8415314 ]	[[4597476.44408782 24549.93369109 64555.41450287] [ 24549.93369109 30431.95390227 -36643.4582481 ] [ 64555.41450287 -36643.4582481 61192.24480486]]
Group 19	[-1.44202775e+05 -1.19371863e+03 1.32851965e+02]	[[ 8.75852163e+05 -4.28371252e+04 2.01340536e+03] [-4.28371252e+04 3.42657228e+03 1.09594251e+01] [ 2.01340536e+03 1.09594251e+01 2.43033588e+02]]
Group 20	[-139696.13050422 684.1370522 673.01046593]	[[ 1.60182991e+05 -6.48573377e+02 5.84095335e+03] [-6.48573377e+02 2.40382112e+02 -7.13801170e+01] [ 5.84095335e+03 -7.13801170e+01 5.38581650e+02]]
Group 21	[-1.35221850e+05 -8.29681477e+01 6.90632673e+02]	[[96984.18135943 -1614.08208165 1113.18058704] [-1614.08208165 485.40517723 -470.54374947] [ 1113.18058704 -470.54374947 657.10420371]]
Group 22	[-1.64880994e+05 1.53273168e+02 2.22079438e+01]	[[2.14492608e+05 1.08056282e+04 3.21271158e+02] [1.08056282e+04 9.17987287e+02 5.47620158e+01] [3.21271158e+02 5.47620158e+01 4.46311098e+01]]
ED-3	[-87093.51684654 -2564.73543273 1387.80128936]	[[5203520.18493455 -110249.01431307 15397.06756633] [-110249.01431307 8857.87874759 5485.1125867 ] [ 15397.06756633 5485.1125867 7730.71566523]]
Typhon	[-45156.52899756 610.44497946 2908.45803035]	[[ 1.12596616e+07 1.50100525e+04 4.07889817e+04] [ 1.50100525e+04 2.58739058e+03 -3.11008273e+03] [ 4.07889817e+04 -3.11008273e+03 1.77926058e+04]]
ED-5	[-73131.75666162 -417.41420858 1360.2131682 ]	[[ 9.72579177e+06 -6.76349294e+04 -5.20633341e+04] [-6.76349294e+04 6.15159686e+03 -2.35515097e+03] [-5.20633341e+04 -2.35515097e+03 3.42501276e+03]]
Group 27	[-1.54229163e+05 2.19425858e+01 4.42123138e+01]	[[ 4.74530803e+04 5.52197029e+02 -4.13613842e+02] [ 5.52197029e+02 1.32709766e+02 -6.37222779e+01] [-4.13613842e+02 -6.37222779e+01 3.82679362e+01]]
ED-6	[-60528.1962893 -723.97224311 1782.30087621]	[[5474752.34150951 36149.29719424 126840.81949945] [ 36149.29719424 41587.13708458 -8938.30664713] [ 126840.81949945 -8938.30664713 30249.31217349]]

Dependancies

• Astropy
• numpy