IS THERE A MAXIMUM MASS FOR STAR FORMATION? Picture Credit: NASA, - PowerPoint PPT Presentation

IS THERE A MAXIMUM MASS FOR STAR FORMATION? Picture Credit: NASA, ESA, and The Hubble Heritage Team Peter Behroozi, STScI Quenching & Quiescence, 7/17/14

MAKING SENSE OF EVERYTHING WE KNOW SO FAR ABOUT Q&Q Picture Credit: NASA, ESA, and The Hubble Heritage Team Peter Behroozi, STScI Quenching & Quiescence, 7/17/14

Lots of information not so much order. ( Most common abstract words for Q&Q )

A guiding principle for organization: A s s i m p l e a s p o s s i b l e , b u t n o t s i

Cosmic W eb Hot Gas Cold Gas GMCs Stars/BH Galaxy Formation: � Studying links between these kinds of matter

Cosmic W eb Hot Gas Cold Gas GMCs Stars/BH

Cosmic W eb Hot Gas Cold Flows Cold Gas Mergers GMCs Stars/BH

Cosmic W eb Hot Gas Cold Flows Feedback Cold Gas Mergers GMCs Stars/BH Key Question: What determines each link’s strength?

Key Findings So Far z 8 4 2 1 0.5 0.2 0 15 10 No Halos Star Formation Rate Cosmic W eb 14 10 Hot Gas • ] 13 Halo Mass [M O 10 12 Cold Gas 10 2.8 11 10 log 10 (SFR) GMCs -1.1 10 10 Stars/BH -5.0 9 10 1 2 4 6 8 10 12 13.8 Time Since Big Bang [Gyr] Behroozi et al. 2013 or Moster et al. 2013

Key Findings So Far z 8 4 2 1 0.5 0.2 0 15 10 No Halos Star Formation Efficiency Cosmic W eb 14 10 Hot Gas • ] 13 Halo Mass [M O 10 12 Cold Gas 10 log 10 (SFR/MA) -0.3 11 10 GMCs -2.6 10 10 Stars/BH -5.0 9 10 1 2 4 6 8 10 12 13.8 Time Since Big Bang [Gyr] Behroozi et al. 2013 Halo Mass is Important, Redshift Maybe Less So

Satellite Galaxies Host Halo -1 ] 1 Probability Density [dex Hot Gas Cold Gas GMCs a = 1.0 a = 0.5 a = 0.25 Stars/BH 0.1 1 10 R peak,mass / R acc,host Behroozi et al. 2014 Non - quiescent Satellite SFRs very similar to Central SFRs!

Satellite Galaxies Host Halo Hot Gas Cold Gas GMCs Stars/BH W etzel et al. 2013 Non - quiescent Satellite SFRs very similar to Central SFRs!

Massive Galaxies Cosmic W eb Hot Gas Cold Gas GMCs Stars/BH W atson, Hearin et al. 2014 Massive Galaxies aren’t so di ff erent from satellites ( ! )

Quenched Galaxies Cosmic W eb Hot Gas ? Cold Gas GMCs Stars/BH Tumlinson et al. 2013 Plenty of cold gas, just not forming H2 ( ! )

Quenched Galaxies Cosmic W eb Hot Gas ? Cold Gas GMCs Stars/BH Tumlinson et al. 2013 Plenty of cold gas, just not forming H2 ( ! )

Merging Galaxies Cosmic W eb Hot Gas Cold Gas GMCs Stars/BH Patton et al. 2013 Extra cold gas/H2 = more SFR, but not extra hot gas ( ! )

Galaxies With AGNs Cosmic W eb ? Hot Gas ? Cold Gas ? GMCs Stars/BH Hickox et al. 2013 AGN activity doesn’t automatically quench SFR, � so there must be a way for incoming cold gas to bypass feedback � ( or does AGN feedback just delay SF? )

Summary Cosmic W eb Cosmic W eb Hot Gas Hot Gas Convenient way � to combine many results � Cold Gas Cold Gas in single theory GMCs GMCs Stars/BH Stars/BH

Summary Host Halo Cosmic W eb Hot Gas Hot Gas Massive galaxies � may quench for the same reason � Cold Gas Cold Gas as their satellites GMCs GMCs Stars/BH Stars/BH

Summary Merging galaxies � Cosmic W eb Cosmic W eb suggest that hot gas may not � Hot Gas be so important � Hot Gas ? Cold Gas Cold Gas So quenching may just � GMCs GMCs be a sign that no more cold � flows are occurring � Stars/BH Stars/BH

Summary Cosmic W eb Cosmic W eb ? ? Hot Gas Hot Gas In this scenario, � AGNs sustain quenching � ? ? Cold Gas Cold Gas but aren’t only cause � ? ? GMCs GMCs Stars/BH Stars/BH