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Exploring Cosmic Evolution: Galaxies, Stars, and AGN with Large-Scale Structure Analysis

Investigating the correlated evolution of galaxies, stars, and AGN via large-scale structure analysis with photo-z to identify and quantify LSS. Utilizing adaptive smoothing and cluster identification techniques to analyze galaxy types and environmental effects. Detailed steps for galaxy accumulation and density analysis to map structures and measure properties within the cosmos.

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Exploring Cosmic Evolution: Galaxies, Stars, and AGN with Large-Scale Structure Analysis

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  1. The heart of COSMOS : correlated evolution of Galaxy , Stars and AGN w/ Large Scale Structure critical to : identify and quantify LSS how well can this be done w/ photo-z ?

  2. redshift slice from  CDM sim. Frenk etal

  3. Structures/Cluster identification : • adaptive smoothing avoid a priori assumptions w.r.t. shapes and sizes 2 possibilities : select all types of gal. or just early (red seq.) types (easier) but precludes investigation of environmental effects

  4. setup : select galaxies ==> RA, DEC, Z cube ==> accumlate  gal 2) average surface density in slice ==>  back 3) noise (  ) from galaxy counts (  gal ), including background steps : gaussian spatial filter at highest res. , cell = 0.01 deg find ra,dec’s cells w/ smoothed density (  gal -  back ) w/ snr > 4  smoothed snr (current width - twice current width) > 1  remove the delta (  gal -  back ) -- this res. - twice this res. increase the filter width -- go to #2

  5. All SED types

  6. All SED types

  7. ID structures as connected RA,DEC,z 3-d volume above cutoff preliminary connected pixels Finding chart for prelim. LSSs recombine manually ‘LSS’s which were sub-divided

  8. Final LSS (1-9 out of 37) gal w/i each LSS

  9. luminous early-type ==> dense core of LSS

  10. 37 structures measure : centroids (RA, DEC, Z) , masses , # galaxies , probability

  11. LSS finding chart w/I COMOS field

  12. LSS mass : summing galaxies within

  13. Output catalog of galaxies w/i each LSS lss # galaxy seq # from phot-z caalog RA(-150 deg.)centroid weighted by galaxy counts (not mass) Dec(-2 deg.) centroid z centroid galaxy photometric mass galaxy SED type probability of galaxy in LSS vs background LSS seq# RA DEC Z M SED prob. 1 286122 0.1772 0.1118 0.7500 3.396e+09 3.67 0.377 1 286070 0.2271 0.1202 0.8100 8.570e+09 2.33 0.347 1 286156 0.2116 0.1164 0.8300 1.012e+09 3.33 0.339 1 285858 0.2086 0.1211 0.8500 8.185e+09 3.67 0.316 . . .

  14. LSS 2: z = 0.75 • Left: Subaru, Right: ACS • Red: Early Type, Green: Late type

  15. Left: Subaru, Right: ACS Red: Early Type, Green: Late type LSS 19: z = 0.50

  16. Early type (< 2) SEDs Late type (> 2) SEDs

  17. Prob. of halo mass structures LSS structure masses cosmos

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