Transcript The Transient Universe AY 250 - University of California

Future Observations of SN IA
Geoff Bower
The Transient Universe: AY 250
Spring 2007
SN Ia
SN 2002hp
From GOODS
The Transient Universe: AY 250
Spring 2007
Type Ia Supernovae and
Cosmology
H0 = 72 +/- 8
km/s/Mpc
Omega_lambda =
0.7
Omega_m = 0.3
Filippenko 2003
The Transient Universe: AY 250
Spring 2007
The Transient Universe: AY 250
Spring 2007
Stretch Correction
• Time dilation
correction
• The more luminous
the SN, the longer the
timescale
The Transient Universe: AY 250
Spring 2007
Goals of Supernova Searches
• Nearby SNe
• Distant SNe
– Calibrate stretch
relations
– Dependence on
environment, SN host
– SN rate
– Physical
understanding of
progenitor(s), events,
& calibrations
– Add points to
magnitude-redshift
relation
The Transient Universe: AY 250
Spring 2007
Two Future Directions
The Transient Universe: AY 250
Spring 2007
SNAP
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•
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Space mission
2m telescope
1 sq deg FOV
Small NIR imager
Spectrometer
– 0.3 – 1.7 microns
• 2000 SN IA/year
– Z = 0.1 – 1.7
• Full light curves
– 2 to 80 days
• Tight control of
systematics
• Survey 20 sq degrees
Perlmutter et al 2004
The Transient Universe: AY 250
Spring 2007
The Transient Universe: AY 250
Spring 2007
The Transient Universe: AY 250
Spring 2007
Separating Cosmological Constant
from Quintessence
The Transient Universe: AY 250
Spring 2007
System Design
The Transient Universe: AY 250
Spring 2007
System Design
The Transient Universe: AY 250
Spring 2007
Redshift Dependence of Results
The Transient Universe: AY 250
Spring 2007
Quality of Space-Based PSF
Z=0.83
The Transient Universe: AY 250
Spring 2007
Space-Based Observations Win
Over Ground-Based
The Transient Universe: AY 250
Spring 2007
Comparison with Other Facilities
The Transient Universe: AY 250
Spring 2007
LSST
• Ground-based
telescope
• 8 meter
• 5 colors
• Two observing modes
– All sky every 3 days
– Staring
• 250,000 SN IA/year in
all sky
– Z <0.8
• 14,000 in Staring
mode
– Z < 1.4
• Photo-red shift only
– Delta Z ~ 0.01
The Transient Universe: AY 250
Spring 2007
The Transient Universe: AY 250
Spring 2007
Wang et al 2005
The Transient Universe: AY 250
Spring 2007
The Transient Universe: AY 250
Spring 2007
The Transient Universe: AY 250
Spring 2007
Summary
• SNAP
• LSST
– Limited number
– Small FOV
– Many objects
– Whole sky
– Spectroscopy
– Control of systematics
– No gaps due to
weather
– Photo-z
– Simultaneous BAO
– Hubble constant
measurement
The Transient Universe: AY 250
Spring 2007