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02/02/12 Galaxy Evolution Seminar 2
Motivation
Cosmic Star Formation History
Mid IR Excess
Scaling Relations
(U)LIRGsDaddi et al. 2010
Hopkins et al. 2006
Hammer et al 2010
02/02/12 Galaxy Evolution Seminar 3
Herschel Satellite
Launched: 14 May 2009
Lifetime: ~ 3-4 years
Mirror Size: 3.5 m
Wavelength coverage: 55 - 672 µm
One of the major science objectives:Study the formation of galaxies in the early Universe and their subsequent evolution
S
ESA
02/02/12 Galaxy Evolution Seminar 4
PACS & SPIRE PACS – Photodetector Array
Camera and Spectrometer
SPIRE – Spectral and Photometric Imaging Receiver
100 μm160 μm250 μm350 μm500 μm
ESA
ESA
ESA
ESA
02/02/12 Galaxy Evolution Seminar 5
GOODS Fields
http://www.universetoday.com/24120/ursa-major/
Observation time GOODS-H: 362.6h
10'x15'
02/02/12 Galaxy Evolution Seminar 6
GOODS-Fields
http://cdn.physorg.com/newman/gfx/news/hires/1-galaxyhistor.jpg
10'x10'
Photo by Akira Fujii
02/02/12 Galaxy Evolution Seminar 7
Confusion
3.6 μm 8 μm 16 μm 24 μm 70 μm
100 μm 160 μm 250 μm 350 μm 500 μmHe
rsch
el
(3.5
m)
Spi
tzer
(0
.85
m)
02/02/12 Galaxy Evolution Seminar 8
Detection Limits
02/02/12 Galaxy Evolution Seminar 9
Mid IR Execess Problem
http://isc.astro.cornell.edu/~spoon/crashcourse.html Spoon et al.
Elbaz 2010
02/02/12 Galaxy Evolution Seminar 10
Mid IR Execess Problem
http://isc.astro.cornell.edu/~spoon/crashcourse.html
02/02/12 Galaxy Evolution Seminar 11
Bolometric Correction
02/02/12 Galaxy Evolution Seminar 12
Bolometric Correction
02/02/12 Galaxy Evolution Seminar 13
Main Sequence
Daddi et al. 2007
02/02/12 Galaxy Evolution Seminar 14
Main Sequence – Different SFR modes
02/02/12 Galaxy Evolution Seminar 15
Main Sequence in Redshift Space
02/02/12 Galaxy Evolution Seminar 16
Summary
Herschel is getting deeper than any other mission before in the FIR-regime
Better extrapolation models for IR SEDs
New normalization makes it possible to compare SFR of galaxies at different z
Two different classes of SF galaxies modes in the early universe resulting in different SF scenarios
There exists an IR main sequence from z=0-2.5
