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Planck 2011 Conference the Millimeter And PLANCK 2011 CONFERENCE THE MILLIMETER AND SUBMILLIMETER SKY IN THE PLANCK MISSION ERA 10-14 January 2011 Paris, Cité des Sciences (Abstracts version Jan 14th) Planck mission status, Performances, Cross-calibration Herschel - update with a Planck perspective Pilbratt Goran, European Space Agency The Herschel Space Observatory was launched together with Planck on 14 May 2009. Herschel carries a 3.5 m diameter Cassegrain telescope and three instruments: PACS, SPIRE, and HIFI. It covers the wavelength range ~55-671 um for photometry and spectroscopy, with an angular resolution of approximately 7"/100 um. Early Herschel science performance and science results will be presented, with an attempt of a Planck perspective. The observing opportunities for follow-up of Planck results, in particular the ERCSC, will be outlined. Radio sources A Bayesian technique to detect point sources in CMB maps Argueso Francisco, Departamento de Matematicas. Universidad de Oviedo and E. Salerno, D. Herranz, J. L. Sanz, E. Kuruoglu, K. Kayabol; IFCA, CSIC, Santander, Spain. ISTI, CNR, Pisa, Italy The detection and flux estimation of point sources in cosmic microwave background (CMB) maps is a very important task in order to clean the maps and also to obtain relevant astrophysical information. We propose a new strategy based on Bayesian methodology which can be applied to the blind detection of point sources in CMB maps. The method incorporates three prior distributions: a uniform distribution on the source locations, an extended power law on the source fluxes, following the De Zotti counts model, and a Poisson distribution on the number of point sources per patch. Together with a Gaussian likelihood, these priors produce a posterior distribution. We maximize this posterior with respect to the source fluxes in order to estimate them. At the same time, we show that the detected sources must be in the peaks of the matched-filtered maps. Finally, we choose the number of sources which maximizes the posterior for the estimated fluxes. In this way, we give a non- arbitrary method to select the number of point sources. To check the performance of our method, we carry out flat CMB simulations for the Planck channels from 30 to 100 GHz. For simplicity, we have excluded the foregrounds in our simulations. We compare our Bayesian strategy with the application of a matched filter with a typical 5 sigma cut. The percentage of spurious sources is always below 5% from 0. 2 Jy on for both methods and the completeness is much better for the Bayesian method. The 10C survey of Radio Sources - First Results. Scaife Anna, Dublin Institute for Advanced Studies on behalf of the AMI Consortium; Cavendish Laboratory, University of Cambridge 1 I present first results from the Tenth Cambridge (10C) Survey of Radio Sources at an observing frequency of 15.7GHz. The survey fields cover an area of 27 sq. degrees to a flux density completeness of 1mJy, and include deeper areas covering 12 sq. degrees complete to 0.5mJy. The 10C survey is the deepest radio survey of any significant extent (>0.2 sq. degrees) above 1.4GHz. The 10C source catalogue contains 1897 entries and is reasonably parameterized by a single power law. At S<60mJy the measured counts are found to be lower than those predicted by de Zotti et al. (2005). Matching the 10C catalogue to the 1.4GHz FIRST and NVSS results provides evidence that the spectral indices of the sub-mJy population at 15.7GHz are flatter than those of the super-mJy population. I will discuss these results in detail as well as providing a technical overview of the survey itself. Spectral energy distributions and radio continuum spectra of northern extragalactic radio sources Lahteenmaki Anne, Aalto University, Metsahovi Radio Observatory (invited on Planck early paper) SEDs, based on Planck ERCSC and simultaneous multifrequency data, of a northern sample of extragalactic radio sources are presented. The large frequency coverage of Planck also allows a look at the more detailed radio continuum spectra. SED modelling methods are briefly discussed, with an emphasis on proper modelling of the synchrotron component. Ground based radio observations for Planck Massardi Marcella, INAF-Osservatorio Astronomico di Padova Planck is performing an all-sky, low resolution, survey in nine bands from 30 to 857 GHz detecting a large sample of extragalactic radio sources. We will discuss the role of extragalactic radio sources in Planck data and the synergies of Planck with some of the major ground-based observational facilities (ATCA, Efferlsberg, Medicina, Metsahovi, RATAN, VLA) investigating the radio source population properties in total intensity and polarisation. By joining almost simultaneous ground-based observations at frequencies lower or comparable to the Planck ones it is now possible to reconstruct the SEDs across the radio and FIR bands to investigate the population properties and improve the models that describe the physics of radio sources without any effect due to variability. On one hand Planck benefits from observations close in time and frequency to the lower Planck ones to validate the quality of the source extraction techniques in total intensity and polarisation. On the other hand, Planck flux density calibration based on the CMB dipole are being used to solve the absolute calibration difficulties for the ground-based telescopes due to AGN variability and to the fact that planets have complicated emission and are resolved for interferometers. Here we show some of the results of these observational campaigns, focussing on those obtained by the Planck-ATCA Co-eval Observations project for the Southern sky and by the Simultaneous Medicina-Planck Experiment for the Northern sky. The CMB Polarization Foreground of Radio-loud AGNs Wiesemeyer Helmut, Max Planck Institute for Radio Astronomy and I. Agudo (1), C. Thum (2); (1) IAA Granada (Spain) /Institute for Astrophysical Research, Boston (USA), (2) IRAM Grenoble (France) Out of the Galactic plane, the most important contribution to the contamination of CMB polarization measurements by foreground sources is from radio-loud AGNs. Monitoring their polarization properties at mm (rather than radio) wavelengths during the Planck mission is a valuable tool both for studying the intrinsic polarization properties of AGN (owing to the weakness of Faraday rotation) and for the correction of the corresponding foreground signal in Planck's HFI survey. The polarization of AGNs at mm wavelengths is dominated by the emission from the compact, innermost regions of their relativistic jets, whereas the bright emission at cm wavelengths is from jet regions further downstream, because of synchrotron opacity effects. We have observed 145 flat-radio-spectrum AGNs with flux density exceeding 1 Jy, using the XPOL polarimeter at the IRAM 30m telescope at 86 GHz. 76 % and 6 % of our source sample (dominated by blazars) show linear, respectively circular polarization above detection thresholds of 1.5 % and 0.3 %, respectively. The linear polarization at 86 GHz exceeds that at 15 GHz by a factor of ~2, and the jet luminosity is anti-correlated with the fractional linear polarization. No correlation was found between the position angles of the linear polarization and those of the jet axis, most likely due to the asymmetry of the 3mm emission region of the jets. Here we will discuss the relevance of our results for the accurate removal of foregrounds in CMB surveys. High frequency blazar flares: The potential of Planck Rachen Jorg Paul, Max-Planck-Institite for Astrophysics and G. Rocha (1), L. Fuhrmann (2), E. Angelakis (2), T.P. Krichbaum (2), I. Nestoras (2); (1) Jet Propulsion Laboratory, Pasadena, CA; (2) Max-Planck-Institute for Radioastronomy, Bonn, Germany Blazars, the super-class of flat spectrum radio quasrs and BL Lac objects, are the dominant population of extragalactic point sources at millimetre frequencies(about 30 to 200 GHz), known for their strong variability. In flaring phases, some blazars have shown an increase in luminosity of more than an order of magnitude, in which case non-thermal, variable emission may dominate their spectra even in the submillimetre regime and above. Performing more than four full sky surveys over two years, the Planck Surveyor Mission is an ideal instrument 2 to discover blazar flares in the scarcely explored regime above 100 GHz. We briefly present the potential and methods for the Planck mission to investigate variable point sources, and discuss some interesting cases of variability seen from the comparison of Planck ERCSC data with results from an ongoing monitoring program involving the Effelsberg 100m, and the IRAM Pico Veleta 30m telescopes. (Poster 01) High-frequency predictions for number counts and spectral properties of extragalactic radio sources Tucci Marco, Laboratoire de l'Accelerateur Lineaire (LAL) and Luigi Toffolatti, Enrique Martinez-Gonzalez; Departamento de Fisica, Universidad de Oviedo, Spain; Instituto de Fisica de Cantabria, CSIC, Universidad de Cantabria, Spain In this contribution we present new predictions on number counts of extragalactic radio sources at frequencies >5GHz, by extrapolating observational data coming from surveys at low radio frequencies. Our approach is somewhat different than before, because we provide a statistical characterization of the source spectral behaviours at high radio frequencies that takes into account, at least partially, the main physical mechanisms responsible of the emission. We focus on flat-spectrum radio sources, i.e. the dominant source population in the flux and frequency ranges we are interested in. Models of synchrotron emission from inhomogeneous unresolved relativistic jets predict that, at a particular frequency, jet emissions cease to be dominated by optically-thick synchrotron, and become dominated by synchrotron in optically-thin regime. Spectra then change its slope from ``flat'' to ``steep''. We determine this frequency on the basis of standard models for synchrotron emission in blazars and of typical values for the involved physical parameters. Moreover, we also discuss the contribution from ""inverted-spectrum"" sources, by using a purely statistical approach.
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