Planck Satellite Revisited

Anne Lähteenmäki

Metsähovi Radio Observatory

Helsinki University of Technology TKK

Anne LähteenmäkiMetsähovi Radio Observatory TKK

CMB missions

7

0.3

Planck 20105’ 30’

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