Insights into Galaxy Groups from ECDF-S Observations

ECDF-S, led by Alexis Finoguenov, has provided a unique catalog of galaxy groups with low halo masses. Comparisons with weak lensing signal and clustering show good agreement, while Planck13 LCDM predictions can be adjusted by increasing group masses. Limited structure in CDFS within the 0.2 < z < 0.6 range is noted.

• Galaxy Groups
• ECDF-S
• Alexis Finoguenov
• Weak Lensing
• Clustering

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1. Exdended sources in ECDF-S Alexis Finoguenov Helsingin Yliopisto UMBC

2. Fluctuations down to 5x10-17 ergs/s/cm2 Alexis Finoguenov CDFS: extended sources 2

3. CDFS vs COSMOS Alexis Finoguenov CDFS: extended sources 3

4. Kirk structure at z=1.6 Alexis Finoguenov CDFS: extended sources 4

5. Random catalog Alexis Finoguenov CDFS: extended sources 5

6. Reproducing the observed emission Alexis Finoguenov CDFS: extended sources 6

7. Simulated point sources Alexis Finoguenov CDFS: extended sources 7

8. ACF of galaxy groups b_obs/b_model=1.1 0.1 This constraints the deviations from the assumed scaling relation to be < 30% in total mass. Alexis Finoguenov CDFS: extended sources 8

9. GEMS Alexis Finoguenov CDFS: extended sources 9

10. Lx-Mass from weak lensing lgM=0.6lgLx+C Alexis Finoguenov Ami Choi CDFS: extended sources 10

11. Groups vs LCDM Finoguenov et al. 2010 Alexis Finoguenov CDFS: extended sources 11

12. dn/dz the void is 0.3<z<0.6 Alexis Finoguenov CDFS: extended sources 12

13. Conclusions ECDF-S delivered a very unique catalog of galaxy groups, probing interestingly low halo masses. We have compared the mass calibration with the weak lensing signal and the clustering, finding a good agreement Planck13 LCDM overpredicts the number of groups that should be visible in ECDF-S. Ths can be alleviated by ascribing 30% higher mass to each group. Finally, the known lack of structure in CDFS is contained to 0.2<z<0.6 range. Alexis Finoguenov CDFS: extended sources 13

14. Papers Ziparo et al 2013ab : SF gradients in groups Tanaka et al. 2013: z=1.6 group Popesso et al: contribution of groups to the global SFR Oh et al. 2014 AGN population in groups Finoguenov et al. Catalog Erfanianfar: Galaxy properties in deep fields Mountrichas: clustering of AGNs outside groups Athena+ white papers Cappelluti: residuals Ursino: WHIM Alexis Finoguenov CDFS: extended sources 14