supernova rates: today, and with the new hst dan maoz
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Supernova Rates: Today, and with the New HST Dan Maoz. Riess et al. (2004, 2007) + Astier et al. (2006). W m =0.3 , W L =0.7. W m =1 , W L =0. But supernova rates are also very interesting:. Supernovae: source of essentially all elements heavier than oxygen. - PowerPoint PPT PresentationTRANSCRIPT
Supernova Rates: Today, and with the New HST
Dan Maoz
Riess et al. (2004, 2007) + Astier et al. (2006)
But supernova rates are also very interesting:
m=1,
m=0.3,
By measuring SN rates vs. redshift we can see cosmic metal enrichment in action!
+Figure out what is exploding in type-Ia’s
Supernovae: source of essentially all elements heavier than oxygen
Type Ia supernova:Accretion on, or merging of,C/O WD, up to ~MChandra .
Carbon ignition under degenerate conditions:Thermonuclear runaway
Yungelson & Livio (2000)
SN-Ia Rate (t)
t
SN-Ia “delay time distribution”
But: (Mannucci et al. 2005)
SN-Ia rate is proportional to star-formation rate!
Locally, ~1/2 SNe-Ia : “prompt” (~0.1 Gyr)
and
~1/2 SNe-Ia “tardy” (~5 Gyr)
SN delay time distribution (t)
Star-formation history (z)
*
SN rate (z)=
HST/ACS GOODS (~700 orbits) Riess et al. 2004, 2007, ~80 SNe, 46 SNe-Ia, 24 @ z>1
Peak in SN-Ia rate at z~0.8 implies 3 Gyr; inconsistent with expected dominance of “prompt” channel when SFR was 10X greater than today.
Need better/larger samples.
but
HST/GOODS very expensive (~700 orbits).
Can it be done from the ground?
A deep SN survey in the Subaru Deep Field
• 2-night runs on Subaru/Suprime-Cam, 0.25 deg2 field
• Re-image the SDF:
r, i ~ 27 mag z ~ 26 mag
Single-epoch photometric SN classification
D. Poznanski et al 2007
0.2% of the field
Record-holder: Most distant SN with spec-z (1.56)
33 SNe in 2 nights:
Every additional epoch adds ~40 SNe:
After two more successful runs in Feb and May 2007, + more in June 2008 ~150-200 SNe.
Soon: similar project with LBT-Italy on COSMOS field
Going to higher redshift with the new HST…
Surveying for high-z SNe with WFC3:
(predictions by K. Sharon)
Potential for SNe out to z~2.5:
predictions by K. Sharon)
Conclusions:
1. WFC3 can see SNe-Ia out to z~2.5, if there.
2. Will show if SN-Ia have short/long delay at high z.
3. Potentially extend Hubble diagram to decelaration era.
4. Find core-collapse SNe at z>1: SFR
5. Metal-enrichment in action over most of age of Universe.