The SN Ia Rate In 0.5
description
Transcript of The SN Ia Rate In 0.5
![Page 1: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/1.jpg)
The SN Ia Rate In0.5<z<0.9 ClustersThe SN Ia Rate In
0.5<z<0.9 Clusters
Keren Sharon
Tel Aviv University
Keren Sharon
Tel Aviv University
Avishay Gal-Yam, Dani Maoz, Alex Filippenko, Ryan Foley, Jeff Silverman, Harald Ebeling, C.J. Ma, Eran Ofek, Megan Donahue, Richard Ellis,Robert Kirshner, Thomas Matheson, John Mulchaey, Vicki Sarajedini, Mark Voit
![Page 2: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/2.jpg)
Firenze, May 2008
Gal-Yam et al. (2002)
Sharon et al. (2007)Mannucci et al. (2007)
![Page 3: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/3.jpg)
Firenze, May 2008
Overview
15 Clusters at 0.5< z <0.9 HST imaging (PI Gal-Yam)
Follow-up & luminosity from ground (@Keck, Palomar, Subaru)
Found ~10 cluster candidates
![Page 4: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/4.jpg)
Firenze, May 2008
The Cluster Sample0.5>z>0.9
x-ray luminous
Were previously observed by HST/ACS 1 epoch for free
Figure: redshift distribution
Lx distribution of MACS clusters,
Ebeling et al. (2007)
![Page 5: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/5.jpg)
Firenze, May 2008
The Cluster Sample Cluster z
MACS0911 0.504MACS2214 0.504MACS0257 0.506MACS0018 0.540 (aka CL0016) MACS1149 0.544MACS1423 0.545MACS0717 0.548 MACS0454 0.550 (aka MS0451) MACS2129 0.570MACS0647 0.584SDSS1004 0.680MACS0744 0.686MS1054 0.830CL0152 0.831CL1226 0.888
![Page 6: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/6.jpg)
Firenze, May 2008
HST imaging
Epoch 1: Archival, ≥1 orbit in I814 or i775(and additional bands for some clusters)
Epoch 2: cycle 14, 1 orbit/cluster (4x~500s)
Epoch 3: cycle 15, 1 orbit/cluster (but 6 clusters not observed due to ACS’ untimely death)
![Page 7: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/7.jpg)
Firenze, May 2008
Search
Promptly after observation
Image subtraction
All by human (i.e., me )
Total search area:340 arcmin2
37 candidates
![Page 8: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/8.jpg)
Firenze, May 2008
Hosts Redshifts
Keck Sprctroscopy w/ LRIS or DEIMOS
1’’ Longslit / multislit mask
![Page 9: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/9.jpg)
Firenze, May 2008
Spectra examples
![Page 10: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/10.jpg)
Firenze, May 2008
Hosts Redshifts
Keck Sprctroscopy w/ LRIS or DEIMOS1’’ Longslit / multislit mask
9* hosts @cluster z (*one via sdss photo-z)2 hostless8 BG8 FG3 AGN7 ???
8-16 cluster events (?)
![Page 11: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/11.jpg)
Firenze, May 2008
SN Candidates – examples1. cluster events
z=0.55
z=0.54
z=0.89 z=0.83
z=0.55
z=0.83
4.4’’
![Page 12: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/12.jpg)
Firenze, May 2008
SN Candidates – examples2. field events
z=0.87(bg)
z=0.49(fg)
z=0.23(fg) z=0.62(bg)
z=0.75(bg)
z=0.58(bg)
4.4’’
![Page 13: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/13.jpg)
Firenze, May 2008
SN Candidates – examples3. hostless
Cluster z=0.504
Cluster z=0.570
![Page 14: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/14.jpg)
Firenze, May 2008
Numbers to rates:
iibandiLt
SNeRateSN
,
#
Sum over all images Control time
Cluster stellar-luminosity enclosed in search area
*
![Page 15: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/15.jpg)
Firenze, May 2008
Stellar Luminosity
Subaru photometry in BVRIz’ (Ebeling et al.)
0.5x0.5 deg centered on cluster
![Page 16: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/16.jpg)
Firenze, May 2008
Stellar Luminosity
Subaru photometry in BVRIz’ (Ebeling et al.)
0.5x0.5 deg centered on cluster
Star / galaxy separation light profile / half-light radius scales with
magnitude stars and other point sources populate a well-defined locus in this plot, and can be separated from galaxies.
● MU_MAX = peak surface brightness above the background level. (SExtractor)
![Page 17: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/17.jpg)
Firenze, May 2008
Stellar Luminosity
Subaru photometry in BVRIz’ (Ebeling et al.)
0.5x0.5 deg centered on clusterStar / galaxy separation
Net flux inside search area = total flux in area – sky flux density x area ‘cluster SED’
![Page 18: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/18.jpg)
Firenze, May 2008
Stellar Luminosity
(E Spec. Template: Kinney et al. 1996)
![Page 19: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/19.jpg)
Firenze, May 2008
Stellar Luminosity
(Spec. Template: Kinney et al. 1996)
![Page 20: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/20.jpg)
Firenze, May 2008
Stellar Luminosity
(Spec. Template: Kinney et al. 1996)
![Page 21: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/21.jpg)
Firenze, May 2008
Stellar Luminosity
(Spec. Template: Kinney et al. 1996)
![Page 22: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/22.jpg)
Firenze, May 2008
Stellar Luminosity
Convert VRIz’ to restframe B / g
Correct for faint end of luminosity function, due to magnitude limit (usually m~25)
Results: enclosed B-band stellar luminosity, typically ~ 2-5 x1012 LB
![Page 23: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/23.jpg)
Firenze, May 2008
Numbers to rates:
iibandiLt
SNeRateSN
,
#
Sum over all images Control time
Cluster stellar-luminosity enclosed in search area
*
![Page 24: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/24.jpg)
Firenze, May 2008
Search Efficiency Simulations
>120 Fake SNe were blindly added to each image
Reduction and search as in real data
Recovery rate noted as function of magnitude
![Page 25: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/25.jpg)
Firenze, May 2008
Search Efficiency Simulations
![Page 26: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/26.jpg)
Firenze, May 2008
Search Efficiency Simulations
![Page 27: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/27.jpg)
Firenze, May 2008
Uncertainties
Statistical: Poisson errors of order 30%
Systematic: rate estimated many times by Monte-Carlo simulation, drawing:
Stretch factor from Sullivan et al. (2006)Luminosity, efficiency from their distributions (e.g., see Sharon et al. 2007)
Classification uncertainty (in progress)
![Page 28: The SN Ia Rate In 0.5](https://reader034.fdocuments.in/reader034/viewer/2022051316/56813d08550346895da6b1bd/html5/thumbnails/28.jpg)
Firenze, May 2008
Results
Gal-Yam et al. (2002)
Sharon et al. (2007)Mannucci et al. (2008)
SNuB ~ 0.5 SNe/(100yr 1010 LB)
SNuM ~ 0.12 SNe/(100yr 1010 M)
PRELIMINARY