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Planck Satellite Revisited
Anne Lähteenmäki
Metsähovi Radio Observatory
Helsinki University of Technology TKK
Anne LähteenmäkiMetsähovi Radio Observatory TKK
Planck ― ESA Launch in January 2009
together with Herschel satellite ~4 months to reach L2 Whole sky covered once in
6 months → several cycles
Anne LähteenmäkiMetsähovi Radio Observatory TKK
Payload Two instruments, 9 frequencies + polarization:
Low Frequency Instrument LFI (30 – 77 GHz), 20 K High Frequency Instrument HFI (100 – 857 GHz), 0.1 K
Anne LähteenmäkiMetsähovi Radio Observatory TKK
The supremacy of Planck
more frequencies higher resolution higher sensitivity
(also polarization)
Anne LähteenmäkiMetsähovi Radio Observatory TKK
Planck foregrounds
Identification and
elimination of contaminating foreground radio sources ”Garbage for cosmologists = science for astronomers!” Planck will produce the most complete radio source
catalogs ever at high radio frequencies (30 -857 GHz)
Anne LähteenmäkiMetsähovi Radio Observatory TKK
Planck foregrounds complete samples of all classes of radio sources,
possibly also new source types statistical studies, classification of sources... properties of individual source classes shape of the radio spectra → complete SEDs correlation between different frequencies variability at several timescales modelling of radio sources ...
Planck data catalogs
Anne LähteenmäkiMetsähovi Radio Observatory TKK
Quick Detection System (QDS)
Software package that detects unusual point sources in the time-ordered datastream of Planck in one or two weeks from the initial observation
almost realtime follow-up with other instruments
Anne LähteenmäkiMetsähovi Radio Observatory TKK
QDS parameters
Emphasis mostly on “surprising” events & sources
1. New flaring objectsIncludes objects that are expected to be very faint, for example, XBLs, TeV sources etc
2. Inverted spectrum-sources
3. Fast events
4. Strong events in well-known sources
Anne LähteenmäkiMetsähovi Radio Observatory TKK
Planck WGs and CTs
Working Groups (science programme) WG 6 Extragalactic point sources (AGNs) WG 7 Galactic sources (microquasars, stellar
evolution) Core Teams (all practical work during mission)
CTA-09 Non-CMB science
Anne LähteenmäkiMetsähovi Radio Observatory TKK
Planck Baseline Core Science Programme (2001)
The Astrophysics of Quasars and
BL Lac Objects + 4 others including GPS sources,
statistical properties, follow-up etc
The Final Planck Science Programme
will be defined in 2008
”The Bluebook”
CLASSIFIED
Anne LähteenmäkiMetsähovi Radio Observatory TKK
Work @ Metsähovi Before mission (19992008)
mapping, analysis & modelling of foreground sources (BL Lac & GPS objects, faint quasars, variability) + Pre-launch catalogs dedicated source samples collected and observed at Metsähovi contain hundreds of sources
simulations, methods, tools, QDS During mission (20092011)
foreground mapping continues, follow-up observations from ground & with satellites, QDS software operations, publication of QDS results
After mission (2011 ) Analysis, research and publication of Planck
results, follow-up observations