CPLUOS Astrophysics team meeting
Friday 20 Jan 2023, 14:00
→
15:20
Asia/Seoul
물리학과
물리학과
Zoom Meeting https://uos-ac-kr.zoom.us/j/8264902652 Meeting ID: 826 490 2652
Description
https://uos-ac-kr.zoom.us/j/8264902652
14:00
→
15:00
COSMOLOGY
14:00
Hyeonmo's Report_Planar System Generation
10m
Minutes
Speaker
:
Hyeonmo Koo
(
University of Seoul
)
20230120.pptx
Planar System Generation
Refer to "Analyzing Planar Galactic Halo Distributions with Fuzzy/Cold Dark Matter Models.
Each Planar System has a quantity of the following.
Number of Halo(Hernquist Profile Seed): 100
Each mass of Halo(Seed):
𝜋
×
10
8
𝑀⊙
Profile of System: Plummer Profile
𝜌𝑟 = (3𝑀
0
/4𝜋𝑎
3
)(1+r
2
/a
2
)
(-5/2)
Half-Light Radius of System:
𝑎 = 13.6 kpc
Radius Cut of System:
𝑅
max
= 40.8 kpc
𝑣
ini
= 𝑞
1
𝑣
P
+𝑞
2
𝑣
±
q
1
= randomness
𝑣
P
: Random velocity of equillibrium plummer model
q
1
= 0.25, 0.30, 0.35, 0.40, 0.45
Z = 51, 52, 53, 54, 55
Whatever, the spin parameter λ ≅ 0.0422
±0.0050
𝑣
±: Rotational velocity
Comparison of CDM and FDM plots
Boxsize = 204 kpc, resolution = 900
We got coordinates of each cell whose density is larger than 10
7
M
⊙/kpc
3
, in other words, M
cell
≥ 10
7
×(204/900)
3
M
⊙
≅ 1.164
×10
6
M
⊙.
Then, clustered with DBSCAN algorithm: Linking length 1.4 kpc and minimum particles per each cluster 10 (except centroid).
Black circles are the center of each clusters.
q
1
= 0.25, q
2
= 0.75, Z = 51, t = 0.0 Myr ~ 1470.0 Myr
x [kpc]-y [kpc] graph (rotation difference)
x [kpc]-z [kpc] graph (rotation difference)
We got the ellipticity from the eigenvalue of inertia tensor
I
ij
= c/a = (min(eigenvalues)/max(eigenvalues))
1/2
Planar structure of cdm: Time [Myr]-c/a graph
q
1
= 0.25
q
1
= 0.30
q
1
= 0.35
q
1
= 0.40
q
1
= 0.45
Planar structure of fdm: Time [Myr]-c/a graph
q
1
= 0.25
q
1
= 0.30
q
1
= 0.35
q
1
= 0.40
q
1
= 0.45
q
1
= 0.25: Time [Myr]-c/a graph
CDM
FDM
q
1
= 0.30: Time [Myr]-c/a graph
CDM
FDM
q
1
= 0.35: Time [Myr]-c/a graph
CDM
FDM
q
1
= 0.40: Time [Myr]-c/a graph
CDM
FDM
q
1
= 0.45: Time [Myr]-c/a graph
CDM
FDM
14:10
Young's report. FoF and MST algorithm
10m
Speaker
:
Young Ju
14:20
Hannah's Report
10m
Speaker
:
Hannah Jhee
(
University of Seoul
)
14:30
Seyeon's Report - CLML
10m
Speaker
:
Se Yeon Hwang
(
Universe of Seoul
)
14:40
Sumi's report
10m
Speaker
:
Sumi Kim
(
University of Seoul
)
14:50
Dr.Sabiu's Report
10m
Speaker
:
Dr
Cristiano Sabiu
(
University of Seoul
)
15:00
→
15:10
Discussion
10m