Non-Gaussian radio galaxy sims with Websky!
Zack Li, Princeton
Bright radio galaxies are everywhere in our maps.
ACT f90
ACT f150
Naess et al. 2020.
Naess et al. 2020.
We have made ready-to-use mock radio galaxies, correlated with the large-scale structure.
Websky: simulated catalogs and maps of radio galaxies�Zack Li, Giuseppe Puglisi, Mat Madhavacheril, Marcelo Alvarez (in prep)
Li et al (in prep)
Cutting-edge sims: agreement with all current astrophysical data, halo-model correlations with LSS.
Angular separation from halo (arcminutes)
It’s known that radio galaxies are heavily biased, and this causes problems like cluster fill-in.
Flux profile
Li et al (in prep)
Multipole moment
Correlation Coeff
at 143 GHz
tSZ, radio, CIB all trace the large scale structure, so they’re all correlated.
Li et al (in prep)
Radio sources hide small scale physics.
Figure: Lensing convergence contours, overlaid over simulated radio galaxies
Li et al. (in prep)
Radio sources hide small scale physics.
tSZ, kSZ
neutrinos,
dark matter
150 GHz plot from Sehgal et al. 2009
Planck didn’t have to
worry about this.
But we want SZ, ν, DM….
Jets! Lobes! Cores!
on average, ~1% polarized
Total Intensity
Polarized Intensity
Harnett et al. 2004 (30 GHz)
Learn from our data!
Future high resolution CMB will be deep radio source surveys with intensity and polarization
Learn from other data!
Multiwavelength coverage with
VLA, LOFAR, … someday SKA
Forward simulations with Websky: full sky peak patch sims!
122883 particles
15.4 Gpc
Full sky extragalactic foregrounds
(Halos) + (Radio Galaxy Model)
Useful for
Planck 2015
We mask the point sources!
Are we masking clusters and other secondaries?
Current model: Sehgal et al. 2009
redshift
Radio galaxy morphology
FR I
FR II
Perley, Willis and Scott (1979)
The Radio Luminosity Function at 151 MHz, at z < 0.3
XGPaint.jl
generate non-Gaussian realizations of extragalactic foregrounds (CIB/radio)
Really fast, not yet documented very well.
We reproduce the source counts from Sehgal, with our halos from Websky.
The Sehgal 2009 models don’t fully agree with new data, for example the spectral index.
Li et al. (in prep)
The Sehgal 2009 models don’t fully agree with new data, for example the spectral index.
Li et al. (in prep)
Li et al (in prep)
Cutting-edge sims: agreement with all current astrophysical data, halo-model correlations with LSS.
Use these mock radio galaxy catalogs to answer your foreground fears!
Get in touch to get the catalogs! zq@princeton.edu
Example use:
Fabbian, Carron, Lewis, Lembo (2020). Lensed CMB power spectrum biases from masking extragalactic sources.