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,
Peter Behroozi, STScI
Quenching & Quiescence, 7/17/14
Picture Credit: NASA, ESA, and The Hubble Heritage Team
Peter Behroozi, STScI
Quenching & Quiescence, 7/17/14
Picture Credit: NASA, ESA, and The Hubble Heritage Team
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
s i b l e , b u t n
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 Gas GMCs Stars/BH Cold Flows Mergers
Cosmic W eb Hot Gas Cold Gas GMCs Stars/BH Key Question: What determines each link’s strength? Feedback Cold Flows Mergers
Cosmic W eb
Hot Gas
Cold Gas
GMCs
Stars/BH
1 2 4 6 8 10 12 13.8 Time Since Big Bang [Gyr] 10
9
10
10
10
11
10
12
10
13
10
14
10
15
Halo Mass [MO
8 4 2 1 0.5 0.2 z No Halos Star Formation Rate
2.8 log10(SFR)
Behroozi et al. 2013 Moster et al. 2013
1 2 4 6 8 10 12 13.8 Time Since Big Bang [Gyr] 10
9
10
10
10
11
10
12
10
13
10
14
10
15
Halo Mass [MO
8 4 2 1 0.5 0.2 z No Halos Star Formation Efficiency
log10(SFR/MA)
Cosmic W eb
Hot Gas
Cold Gas Stars/BH
Behroozi et al. 2013
Halo Mass is Important, Redshift Maybe Less So
GMCs
Host Halo
Hot Gas
Cold Gas Stars/BH
Behroozi et al. 2014
Non-quiescent Satellite SFRs very similar to Central SFRs!
1 10 Rpeak,mass / Racc,host 0.1 1 Probability Density [dex
a = 1.0 a = 0.5 a = 0.25
GMCs
Host Halo
Hot Gas
Cold Gas Stars/BH
W etzel et al. 2013
Non-quiescent Satellite SFRs very similar to Central SFRs!
GMCs
Cosmic W eb
Hot Gas
Cold Gas Stars/BH
W atson, Hearin et al. 2014
Massive Galaxies aren’t so different from satellites(!)
GMCs
Tumlinson et al. 2013
Plenty of cold gas, just not forming H2(!)
Cosmic W eb
Hot Gas
Cold Gas Stars/BH
?
GMCs
Tumlinson et al. 2013
Plenty of cold gas, just not forming H2(!)
Cosmic W eb
Hot Gas
Cold Gas Stars/BH
?
GMCs
Patton et al. 2013
Extra cold gas/H2 = more SFR, but not extra hot gas(!)
Cosmic W eb
Hot Gas
Cold Gas Stars/BH
GMCs
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?)
Cosmic W eb
Hot Gas
Cold Gas Stars/BH
? ? ?
GMCs
Convenient way to combine many results in single theory
Cosmic W eb
Hot Gas
Cold Gas Stars/BH
Cosmic W eb
Hot Gas
Cold Gas Stars/BH
GMCs GMCs
Massive galaxies may quench for the same reason as their satellites
Host Halo
Hot Gas
Cold Gas Stars/BH
Cosmic W eb
Hot Gas
Cold Gas Stars/BH
GMCs GMCs
Cosmic W eb
Hot Gas
Cold Gas Stars/BH
Merging galaxies suggest that hot gas may not be so important
Cosmic W eb
Hot Gas
Cold Gas Stars/BH
? So quenching may just be a sign that no more cold flows are occurring
GMCs GMCs
In this scenario, AGNs sustain quenching but aren’t only cause
Cosmic W eb
Hot Gas
Cold Gas Stars/BH
? ? ?
Cosmic W eb
Hot Gas
Cold Gas Stars/BH
? ? ?
GMCs GMCs