HaloCatalogues | Skies & Universes (2024)

Column#

Name

Type

Unit

Description

scale

float

scale factor, same as in snapshot-redshifts table

1

id

int64

unique ID for the halo

2

desc_scale

float

scale factor of the descendant halo, if applicable

3

desc_id

int64

ID of the descendant halo, if applicable

4

num_prog

int64

number of progenitors

5

pid

int64

ID of least massive host halo (-1 if distinct halo)

6

upid

int64

ID of most massive host halo (different from pid when the halo is within two or more larger halos)

7

desc_pid

int64

pid of the descendant halo, if applicable

8

phantom

int64

flag for phantom halos, nonzero for halos interpolated across timesteps

9

sam_Mvir

float

Msun/h

halo mass, smoothed across accretion history; always greater than the sum of halo masses of contributing progenitors; only for use with selected semi-analytic models

10

Mvir

float

Msun/h

halo mass (within virial radius)

11

Rvir

float

kpc/h

halo radius (comoving)

12

rs

float

kpc/h

scale radius (comoving)

13

vrms

float

km/s

velocity dispersion (physical)

14

mmp

boolean

flag indicating whether the halo is the most massive progenitor or not

15

scale_of_last_MM

float

scale factor of the last major merger (Mass ratio > 0.3)

16

vmax

float

km/s

maximum circular velocity (physical)

17

x

float

Mpc/h

halo position (comoving)

18

y

float

Mpc/h

halo position (comoving)

19

z

float

Mpc/h

halo position (comoving)

20

vx

float

km/s

halo velocity (physical, peculiar)

21

vy

float

km/s

halo velocity (physical, peculiar)

22

vz

float

km/s

halo velocity (physical, peculiar)

23

Jx

float

(Msun/h)*

(Mpc/h)*

km/s

halo angular momentum (physical)

24

Jy

float

(Msun/h)*

(Mpc/h)*

km/s

halo angular momentum (physical

25

Jz

float

(Msun/h)*

(Mpc/h)*

km/s

halo angular momentum (physical

26

Spin

float

halo spin parameter

27

Breadth_first_ID

int64

ID for breadth-first ordering of halos within a tree

28

Depth_first_ID

int64

ID for depth-first ordering of halos within a tree

29

Tree_root_ID

int64

ID of the halo at the last time-step in the tree

30

Orig_halo_ID

int64

original halo ID from halo finder

31

Snap_idx

int64

Index of snapshot (in the original snapshot list) from which halo originated

32

Next_coprogenitor_

depthfirst_ID

int64

depthfirst ID of next coprogenitor

33

Last_progenitor_

depthfirst_ID

int64

depthfirst ID of last progenitor

34

Last_mainleaf_

depthfirst_ID

int64

depthfirst ID of last progenitor on main progenitor branch

35

Tidal_Force

float

Strongest tidal field from any nearby halo, in dimensionless units (Rhalo / Rhill).

Here "nearby" means within 25 Mpc/h comoving distance. This is applied only for Uchuu. mini- and micro-Uchuu do not have this limitation.

36

Tidal_ID

int64

ID of halo exerting strongest tidal force

37

Rs_Klypin

float

scale radius determined using Vmax and Mvir (see Rockstar paper)

38

Mvir_all

float

Msun/h

Mass enclosed within the specified overdensity, including unbound particles

39

M200b

float

Msun/h

Mass enclosed within overdensity 200*rho_b

40

M200c

float

Msun/h

Mass enclosed within overdensity 200*rho_crit

41

M500c

float

Msun/h

Mass enclosed within overdensity 500*rho_crit

42

M2500c

float

Msun/h

Mass enclosed within overdensity 2500*rho_crit

43

Xoff

float

Kpc/h

Offset of density peak from average particle position (comoving)

44

Voff

float

km/s

Offset of density peak from average particle velocity (physical)

45

Spin_Bullock

float

Bullock spin parameter (J/(sqrt(2)*GMVR))

46

b_to_a

float

ratio of second largest shape ellipsoid axes to largest shape ellipsoid axis (dimensionless); shapes determined by method in Allgood et al. (2006)

47

c_to_a

float

ratio of smallest shape ellipsoid axes to largest shape ellipsoid axis (dimensionless) ); shapes determined by method in Allgood et al. (2006)

48

A_x

float

Kpc/h

largest shape ellipsoid axis (comoving)

49

A_y

float

Kpc/h

largest shape ellipsoid axis (comoving)

50

A_z

float

Kpc/h

largest shape ellipsoid axis (comoving)

51

b_to_a_500c

float

as above but only for particles within overdensity 500*rho_crit (dimensionless)

52

c_to_a_500c

float

as above but only for particles within overdensity 500*rho_crit (dimensionless)

53

A_x_500c

float

Kpc/h

as above but only for particles within overdensity 500*rho_crit (comoving)

54

A_y_500c

float

Kpc/h

as above but only for particles within overdensity 500*rho_crit (comoving)

55

A_z_500c

float

Kpc/h

as above but only for particles within overdensity 500*rho_crit (comoving)

56

T_U

float

ratio of kinetic to potential energies

57

M_pe_Behroozi

float

Msun/h

Pseudo-evolution corrected masses (very experimental)

58

M_pe_Diemer

float

Msun/h

Pseudo-evolution corrected masses (very experimental)

59

Halfmass_Radius

float

Kpc/h

Radius within which 1/2 of Mvir is enclosed

60

rvmax

float

Kpc/h

Radius at Vmax

61

Macc

float

Msun/h

halo mass at accretion

62

Mpeak

float

Msun/h

peak mass over accretion history

63

Vacc

float

Vmax at accretion

64

Vpeak

float

peak Vmax over accretion history

65

Halfmass_Scale

float

scale factor at which the most massive progenitor (mmp) reaches 0.5*Mpeak

66

Acc_Rate_Inst

float

Msun/h/yr

instantaneous halo mass accretion rate

67

Acc_Rate_100Myr

float

Msun/h/yr

halo mass accretion rate averaged over past 100 Myr

68

Acc_Rate_1_Tdyn

float

Msun/h/yr

halo mass accretion rate averaged over past 1*virial dynamical time

69

Acc_Rate_2_Tdyn

float

Msun/h/yr

halo mass accretion rate averaged over past 2*virial dynamical time

70

Acc_Rate_Mpeak

float

Msun/h/yr

growth rate of Mpeak, averaged from current z to z+0.5

71

Acc_Log_Vmax

_Inst

float

Msun/h/yr

Instantaneous growth rate of Log10(Vmax)

72

Acc_Log_Vmax

_1_Tdyn

float

Msun/h/yr

growth rate of Log10(Vmax), averaged over past 1*virial dynamical time

73

Mpeak_Scale

float

scale factor at which Mpeak was reached

74

Acc_Scale

float

scale factor at which satellites were (last) accreted

75

First_Acc_Scale

float

scale factor at which current and former satellites first passed through a larger halo

76

First_Acc_Mvir

float

Msun/h

Mvir at First_Acc_scale

77

First_Acc_Vmax

float

km/s

Vmax at First_Acc_scale

78

Vmax_Mpeak

float

km/s

halo Vmax at the scale at which Mpeak was reached

79

Tidal_Force_Tdyn

float

Dimensionless tidal force averaged over past dynamical time

80

Log_Vmax_Vmax_

_max_Tdyn_Tmpeak

float

Log10 of Vmax_now over Vmax@(Tdyn ago) OR Vmax@Mpeak (if and only if Mpeak happened > 1Tdyn ago)

81

Time_to_future

_merger

float

Gyr

Time (in Gyr) until the given halo merges into a larger halo. (-1 if no future merger happens)

82

Future_merger_

MMP_ID

int64

most-massive progenitor of the halo into which the given halo merges. (-1 if the main progenitor of the future merger halo does not exist at the given scale factor.)

HaloCatalogues | Skies & Universes (2024)

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