CPLUOS Astrophysics team meeting

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

    • COSMOLOGY
      • 1
        Hyeonmo's Report_Planar System Generation
        Speaker: Hyeonmo Koo (University of Seoul)

        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×108𝑀⊙
          • Profile of System: Plummer Profile 𝜌𝑟 = (3𝑀0/4𝜋𝑎3)(1+r2/a2)(-5/2)
          • Half-Light Radius of System: 𝑎 = 13.6 kpc
          • Radius Cut of System: 𝑅max  = 40.8 kpc
          • 𝑣ini  = 𝑞1𝑣P+𝑞2𝑣±
            • q1  = randomness
            • 𝑣P: Random velocity of equillibrium plummer model
              • q1 = 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 107 M⊙/kpc3, in other words, Mcell ≥ 107×(204/900)3 M≅ 1.164×106 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.
          • q1 = 0.25, q2 = 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
          • Iij  = c/a = (min(eigenvalues)/max(eigenvalues))1/2
          • Planar structure of cdm: Time [Myr]-c/a graph
            • q1 = 0.25
            • q1 = 0.30
            • q1 = 0.35
            • q1 = 0.40
            • q1 = 0.45
          • Planar structure of fdm: Time [Myr]-c/a graph
            • q1 = 0.25
            • q1 = 0.30
            • q1 = 0.35
            • q1 = 0.40
            • q1 = 0.45
          • q1 = 0.25: Time [Myr]-c/a graph
            • CDM
            • FDM
          • q1 = 0.30: Time [Myr]-c/a graph
            • CDM
            • FDM
          • q1 = 0.35: Time [Myr]-c/a graph
            • CDM
            • FDM
          • q1 = 0.40: Time [Myr]-c/a graph
            • CDM
            • FDM
          • q1 = 0.45: Time [Myr]-c/a graph
            • CDM
            • FDM
      • 2
        Young's report. FoF and MST algorithm
        Speaker: Young Ju
      • 3
        Hannah's Report
        Speaker: Hannah Jhee (University of Seoul)
      • 4
        Seyeon's Report - CLML
        Speaker: Se Yeon Hwang (Universe of Seoul)
      • 5
        Sumi's report
        Speaker: Sumi Kim (University of Seoul)
      • 6
        Dr.Sabiu's Report
        Speaker: Dr Cristiano Sabiu (University of Seoul)
    • 7
      Discussion