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Testing HOD model Yu Liang. Tsinghua University & Instituto de Física Teórica (IFT), Universidad Autónoma de Madrid (UAM). Background. Five parameter HOD model . Motivation-testing HOD model. Varying the five parameters to fit the correlation function.

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testing hod model yu liang

Testing HOD modelYu Liang

Tsinghua University &

Instituto de FísicaTeórica (IFT), Universidad Autónoma de Madrid (UAM)

background
Background
  • Five parameter HOD model
motivation testing hod model
Motivation-testing HOD model
  • Varying the five parameters to fit the correlation function.
  • After the correlation is fitted well, we check how it will be in power spectrum.
  • We guess HOD model with five parameters can fit any correlation but it won’t be so well even though correlation function is well fitted.
catalogs
Catalogs
  • CatalgoAccSm.a.0.65.DAT (get from Anatoly , some one named peter created sub-sub-halo, original from BDMV)
  • BDMV (whole catalog and with 6.3E13 mass cut to select distinct halo)
  • BDMW (whole catalog and with 6.3E13 mass cut to select distinct halo)
  • FOF with particles (whole catalog and with 6.3E13 mass cut to select distinct halo)
get data by query the multidark database few days
Get data by Query the MultiDarkDatabase (few days)

haloid=$((62000000000+$i))

sql=“

select top 5 fofId, p.particleId, snapnum, x, y, z, vx, vy, vz, phkey from MDR1..FOFParticles62 as fp

inner join MDR1..particles62 as p

on fp.particleId = p.particleId

where fp.fofId = $haloid order by newid()"

get data by query the multidark database few hours
Get data by Query the MultiDarkDatabase (few hours)

with tmp as (

select row_number() over ( partition by fofId order by newid() ) as 'rownum',

fofId,

particleId

from MDR1..FOFparticles62 where fofId between 62000400000 $plus $i $times 1e3 and 62000400999 $plus $i $times 1e3

)

select fp.fofId , p.* from tmpas fp , MDR1..particles62 as p

Where fp.particleId = p.particleId and fp.rownum <= 5

Order by fofId, particleId

check what s going on with the subhalo
Check what’s going on with the subhalo
  • Compute the correlation function of subhalos "only“
  • Compute the distance between each subhalo and its parent distinct halo, and then make a distribution
check what s going on with the subhalo1
Check what’s going on with the subhalo
  • The typical size of a halo is smaller than 1 Mpc/h and it is why we have very large power at first bin.
  • The subhalo picked in my way would boost the power of the correlation function. In addition, we found the subhalos are living very close to distinct halos (i.e. < 1Mpc/h) and that is why we have large power at first two bins (r < 2Mpc/h)
hod model
HOD model
  • Difference between papersa, No central galaxy, no satellite galaxy.b, Satellite galaxies can exist without central galaxy.c, Nsat=[(M-M0)/M1]^alpha (astro-ph/0408564 ZhengZheng et al) d, Nsat=Ncen*[(M-M0)/M1]^alpha (astro-ph/0703457 ZhengZheng et al) e, Nsat=(M/M1)^alpha * exp(-Mcut/M1) (arXiv 1202:6057V4)