Planck early results. V. The Low Frequency Instrument data processing

T. Poutanen; A. Lähteenmäki; J. León-Tavares; P. Natoli; G. Polenta; M.C. Falvella; J.G. Bartlett; G.F. Smoot; R. Stompor; L. Bonavera; L. Bedini; E. Salerno; A.J. Banday; R. Paladini; G. Prézeau; G. Rocha; M.D. Seiffert; P.B. Lilje; Hans Ulrik Nørgaard-Nielsen; L. Toffolatti; M. Cruz; A. Moss; D. Scott; L. Colombo; E. Keihänen; R. Keskitalo; H. Kurki-Suonio; T. Poutanen; A.-S. Suur-Uski; M. Juvela; M. Savelainen; G.F. Smoot; L. Knox; P.R. Meinhold; A. Zonca; R. Leonardi; P.M. Lubin; J.I. Silk; N. Bartolo; S. Matarrese; A. Melchiorri; D. Maino; M. Bersanelli; A. Mennella; M. Tomasi; A. Gregorio; P. Natoli; P. Cabella; G. De Gasperis; G. De Troia; M. Migliaccio; C. Quercellini; N. Vittorio; D. Marinucci; R.T. Génova-Santos; R. Rebolo; J.A. Rubiño-Martín; R. Leonardi; J.A. Tauber; K. Bennett; M. Bremer; G. Giardino; R. Leonardi; J. Sternberg; B. Partridge; H. Kurki-Suonio; T. Poutanen; A.-S. Suur-Uski; A. Lähteenmäki; M. Savelainen; G. Tofani; G. Umana; A. Bonaldi; G. De Zotti; M. Massardi; G. Polenta; A. Zacchei; M. Frailis; S. Galeotta; M. Maris; A. Mennella; F. Pasian; D. Tavagnacco; F. Gasparo; G. Maggio; C. Vuerli; C. Burigana; R.C. Butler; F. Cuttaia; N. Mandolesi; G. Morgante; P. Natoli; S. Ricciardi; M. Sandri; L. Terenzi; F. Villa; A. De Rosa; F. Finelli; E. Franceschi; A. Gruppuso; D. Paoletti; P. Procopio; D. Maino; M. Bersanelli; M. Tomasi; B. Cappellini; S. Donzelli; F. Stivoli; N. Morisset; R. Rohlfs; P. Binko; M.T. Meharga; M. Türler; X. Chen; M. Huynh; J.-L. Puget; F.R. Bouchet; G. Efstathiou; J. Valiviita; S. Donzelli; H.K. Eriksen; F.K. Hansen; P.B. Lilje; R.T. Génova-Santos; F. Gómez; R. Rebolo; J.A. Rubiño-Martín; M. López-Caniego; R.B. Barreiro; A. Curto; J.M. Diego; D. Herranz; E. Martínez-González; P. Vielva; K.M. Górski; R. Keskitalo; C.R. Lawrence; J.G. Bartlett; L. Colombo; T.C. Gaier; J. Jewell; S. Mitra; L. Pagano; D. Pearson; D. Pietrobon; G. Prézeau; G. Rocha; M.D. Seiffert; L.A. Wade; J.P. Leahy; R.D. Davies; R.J. Davis; C. Dickinson; R. Watson; A. Wilkinson; J.-M. Lamarre; J. Borrill; T.S. Kisner; G.F. Smoot; J. Knoche; F. Matthai; M. Reinecke; A.J. Banday; U. Dörl; T.A. Enßlin; R. Hell; W. Hovest; J.P. Rachen; G. Robbers; S.D.M. White; J. Tuovinen; C. Baccigalupi; L. Bonavera; G. De Zotti; J. Dick; J. González-Nuevo; S. Leach; F. Perrotta; L. Danese; V. Pettorino; J. Borrill; R. Paladini; A.J. Banday; K.M. Górski

doi:10.1051/0004-6361/201116484

Planck early results. V. The Low Frequency Instrument data processing

T. Poutanen, A. Lähteenmäki, J. León-Tavares, P. Natoli, G. Polenta, M.C. Falvella, J.G. Bartlett, G.F. Smoot, R. Stompor, L. Bonavera, L. Bedini, E. Salerno, A.J. Banday, R. Paladini, G. Prézeau, G. Rocha, M.D. Seiffert, P.B. Lilje, Hans Ulrik Nørgaard-Nielsen, L. ToffolattiM. Cruz, A. Moss, D. Scott, L. Colombo, E. Keihänen, R. Keskitalo, H. Kurki-Suonio, T. Poutanen, A.-S. Suur-Uski, M. Juvela, M. Savelainen, G.F. Smoot, L. Knox, P.R. Meinhold, A. Zonca, R. Leonardi, P.M. Lubin, J.I. Silk, N. Bartolo, S. Matarrese, A. Melchiorri, D. Maino, M. Bersanelli, A. Mennella, M. Tomasi, A. Gregorio, P. Natoli, P. Cabella, G. De Gasperis, G. De Troia, M. Migliaccio, C. Quercellini, N. Vittorio, D. Marinucci, R.T. Génova-Santos, R. Rebolo, J.A. Rubiño-Martín, R. Leonardi, J.A. Tauber, K. Bennett, M. Bremer, G. Giardino, R. Leonardi, J. Sternberg, B. Partridge, H. Kurki-Suonio, T. Poutanen, A.-S. Suur-Uski, A. Lähteenmäki, M. Savelainen, G. Tofani, G. Umana, A. Bonaldi, G. De Zotti, M. Massardi, G. Polenta, A. Zacchei, M. Frailis, S. Galeotta, M. Maris, A. Mennella, F. Pasian, D. Tavagnacco, F. Gasparo, G. Maggio, C. Vuerli, C. Burigana, R.C. Butler, F. Cuttaia, N. Mandolesi, G. Morgante, P. Natoli, S. Ricciardi, M. Sandri, L. Terenzi, F. Villa, A. De Rosa, F. Finelli, E. Franceschi, A. Gruppuso, D. Paoletti, P. Procopio, D. Maino, M. Bersanelli, M. Tomasi, B. Cappellini, S. Donzelli, F. Stivoli, N. Morisset, R. Rohlfs, P. Binko, M.T. Meharga, M. Türler, X. Chen, M. Huynh, J.-L. Puget, F.R. Bouchet, G. Efstathiou, J. Valiviita, S. Donzelli, H.K. Eriksen, F.K. Hansen, P.B. Lilje, R.T. Génova-Santos, F. Gómez, R. Rebolo, J.A. Rubiño-Martín, M. López-Caniego, R.B. Barreiro, A. Curto, J.M. Diego, D. Herranz, E. Martínez-González, P. Vielva, K.M. Górski, R. Keskitalo, C.R. Lawrence, J.G. Bartlett, L. Colombo, T.C. Gaier, J. Jewell, S. Mitra, L. Pagano, D. Pearson, D. Pietrobon, G. Prézeau, G. Rocha, M.D. Seiffert, L.A. Wade, J.P. Leahy, R.D. Davies, R.J. Davis, C. Dickinson, R. Watson, A. Wilkinson, J.-M. Lamarre, J. Borrill, T.S. Kisner, G.F. Smoot, J. Knoche, F. Matthai, M. Reinecke, A.J. Banday, U. Dörl, T.A. Enßlin, R. Hell, W. Hovest, J.P. Rachen, G. Robbers, S.D.M. White, J. Tuovinen, C. Baccigalupi, L. Bonavera, G. De Zotti, J. Dick, J. González-Nuevo, S. Leach, F. Perrotta, L. Danese, V. Pettorino, J. Borrill, R. Paladini, A.J. Banday, K.M. Górski

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Abstract

We describe the processing of data from the Low Frequency Instrument (LFI) used in production of the Planck Early Release Compact Source Catalogue (ERCSC). In particular, we discuss the steps involved in reducing the data from telemetry packets to cleaned, calibrated, time-ordered data (TOD) and frequency maps. Data are continuously calibrated using the modulation of the temperature of the cosmic microwave background radiation induced by the motion of the spacecraft. Noise properties are estimated from TOD from which the sky signal has been removed using a generalized least square map-making algorithm. Measured 1/f noise knee-frequencies range from ~100 mHz at 30 GHz to a few tens of mHz at 70GHz. A destriping code (Madam) is employed to combine radiometric data and pointing information into sky maps, minimizing the variance of correlated noise. Noise covariance matrices required to compute statistical uncertainties on LFI and Planck products are also produced. Main beams are estimated down to the ≈ -10dB level using Jupiter transits, which are also used for geometrical calibration of the focal plane. © ESO, 2011.

Original language	English
Journal	Astronomy and Astrophysics
Volume	536
Pages (from-to)	A5
ISSN	0004-6361
DOIs	https://doi.org/10.1051/0004-6361/201116484
Publication status	Published - 2011

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Poutanen, T., Lähteenmäki, A., León-Tavares, J., Natoli, P., Polenta, G., Falvella, M. C., Bartlett, J. G., Smoot, G. F., Stompor, R., Bonavera, L., Bedini, L., Salerno, E., Banday, A. J., Paladini, R., Prézeau, G., Rocha, G., Seiffert, M. D., Lilje, P. B., Nørgaard-Nielsen, H. U., ... Górski, K. M. (2011). Planck early results. V. The Low Frequency Instrument data processing. Astronomy and Astrophysics, 536, A5. https://doi.org/10.1051/0004-6361/201116484

@article{e7400f1dc6d04714b68c83cf7dbeb123,

title = "Planck early results. V. The Low Frequency Instrument data processing",

abstract = "We describe the processing of data from the Low Frequency Instrument (LFI) used in production of the Planck Early Release Compact Source Catalogue (ERCSC). In particular, we discuss the steps involved in reducing the data from telemetry packets to cleaned, calibrated, time-ordered data (TOD) and frequency maps. Data are continuously calibrated using the modulation of the temperature of the cosmic microwave background radiation induced by the motion of the spacecraft. Noise properties are estimated from TOD from which the sky signal has been removed using a generalized least square map-making algorithm. Measured 1/f noise knee-frequencies range from ~100 mHz at 30 GHz to a few tens of mHz at 70GHz. A destriping code (Madam) is employed to combine radiometric data and pointing information into sky maps, minimizing the variance of correlated noise. Noise covariance matrices required to compute statistical uncertainties on LFI and Planck products are also produced. Main beams are estimated down to the ≈ -10dB level using Jupiter transits, which are also used for geometrical calibration of the focal plane. {\textcopyright} ESO, 2011.",

author = "T. Poutanen and A. L{\"a}hteenm{\"a}ki and J. Le{\'o}n-Tavares and P. Natoli and G. Polenta and M.C. Falvella and J.G. Bartlett and G.F. Smoot and R. Stompor and L. Bonavera and L. Bedini and E. Salerno and A.J. Banday and R. Paladini and G. Pr{\'e}zeau and G. Rocha and M.D. Seiffert and P.B. Lilje and N{\o}rgaard-Nielsen, {Hans Ulrik} and L. Toffolatti and M. Cruz and A. Moss and D. Scott and L. Colombo and E. Keih{\"a}nen and R. Keskitalo and H. Kurki-Suonio and T. Poutanen and A.-S. Suur-Uski and M. Juvela and M. Savelainen and G.F. Smoot and L. Knox and P.R. Meinhold and A. Zonca and R. Leonardi and P.M. Lubin and J.I. Silk and N. Bartolo and S. Matarrese and A. Melchiorri and D. Maino and M. Bersanelli and A. Mennella and M. Tomasi and A. Gregorio and P. Natoli and P. Cabella and {De Gasperis}, G. and {De Troia}, G. and M. Migliaccio and C. Quercellini and N. Vittorio and D. Marinucci and R.T. G{\'e}nova-Santos and R. Rebolo and J.A. Rubi{\~n}o-Mart{\'i}n and R. Leonardi and J.A. Tauber and K. Bennett and M. Bremer and G. Giardino and R. Leonardi and J. Sternberg and B. Partridge and H. Kurki-Suonio and T. Poutanen and A.-S. Suur-Uski and A. L{\"a}hteenm{\"a}ki and M. Savelainen and G. Tofani and G. Umana and A. Bonaldi and {De Zotti}, G. and M. Massardi and G. Polenta and A. Zacchei and M. Frailis and S. Galeotta and M. Maris and A. Mennella and F. Pasian and D. Tavagnacco and F. Gasparo and G. Maggio and C. Vuerli and C. Burigana and R.C. Butler and F. Cuttaia and N. Mandolesi and G. Morgante and P. Natoli and S. Ricciardi and M. Sandri and L. Terenzi and F. Villa and {De Rosa}, A. and F. Finelli and E. Franceschi and A. Gruppuso and D. Paoletti and P. Procopio and D. Maino and M. Bersanelli and M. Tomasi and B. Cappellini and S. Donzelli and F. Stivoli and N. Morisset and R. Rohlfs and P. Binko and M.T. Meharga and M. T{\"u}rler and X. Chen and M. Huynh and J.-L. Puget and F.R. Bouchet and G. Efstathiou and J. Valiviita and S. Donzelli and H.K. Eriksen and F.K. Hansen and P.B. Lilje and R.T. G{\'e}nova-Santos and F. G{\'o}mez and R. Rebolo and J.A. Rubi{\~n}o-Mart{\'i}n and M. L{\'o}pez-Caniego and R.B. Barreiro and A. Curto and J.M. Diego and D. Herranz and E. Mart{\'i}nez-Gonz{\'a}lez and P. Vielva and K.M. G{\'o}rski and R. Keskitalo and C.R. Lawrence and J.G. Bartlett and L. Colombo and T.C. Gaier and J. Jewell and S. Mitra and L. Pagano and D. Pearson and D. Pietrobon and G. Pr{\'e}zeau and G. Rocha and M.D. Seiffert and L.A. Wade and J.P. Leahy and R.D. Davies and R.J. Davis and C. Dickinson and R. Watson and A. Wilkinson and J.-M. Lamarre and J. Borrill and T.S. Kisner and G.F. Smoot and J. Knoche and F. Matthai and M. Reinecke and A.J. Banday and U. D{\"o}rl and T.A. En{\ss}lin and R. Hell and W. Hovest and J.P. Rachen and G. Robbers and S.D.M. White and J. Tuovinen and C. Baccigalupi and L. Bonavera and {De Zotti}, G. and J. Dick and J. Gonz{\'a}lez-Nuevo and S. Leach and F. Perrotta and L. Danese and V. Pettorino and J. Borrill and R. Paladini and A.J. Banday and K.M. G{\'o}rski",

year = "2011",

doi = "10.1051/0004-6361/201116484",

language = "English",

volume = "536",

pages = "A5",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Poutanen, T, Lähteenmäki, A, León-Tavares, J, Natoli, P, Polenta, G, Falvella, MC, Bartlett, JG, Smoot, GF, Stompor, R, Bonavera, L, Bedini, L, Salerno, E, Banday, AJ, Paladini, R, Prézeau, G, Rocha, G, Seiffert, MD, Lilje, PB, Nørgaard-Nielsen, HU, Toffolatti, L, Cruz, M, Moss, A, Scott, D, Colombo, L, Keihänen, E, Keskitalo, R, Kurki-Suonio, H, Poutanen, T, Suur-Uski, A-S, Juvela, M, Savelainen, M, Smoot, GF, Knox, L, Meinhold, PR, Zonca, A, Leonardi, R, Lubin, PM, Silk, JI, Bartolo, N, Matarrese, S, Melchiorri, A, Maino, D, Bersanelli, M, Mennella, A, Tomasi, M, Gregorio, A, Natoli, P, Cabella, P, De Gasperis, G, De Troia, G, Migliaccio, M, Quercellini, C, Vittorio, N, Marinucci, D, Génova-Santos, RT, Rebolo, R, Rubiño-Martín, JA, Leonardi, R, Tauber, JA, Bennett, K, Bremer, M, Giardino, G, Leonardi, R, Sternberg, J, Partridge, B, Kurki-Suonio, H, Poutanen, T, Suur-Uski, A-S, Lähteenmäki, A, Savelainen, M, Tofani, G, Umana, G, Bonaldi, A, De Zotti, G, Massardi, M, Polenta, G, Zacchei, A, Frailis, M, Galeotta, S, Maris, M, Mennella, A, Pasian, F, Tavagnacco, D, Gasparo, F, Maggio, G, Vuerli, C, Burigana, C, Butler, RC, Cuttaia, F, Mandolesi, N, Morgante, G, Natoli, P, Ricciardi, S, Sandri, M, Terenzi, L, Villa, F, De Rosa, A, Finelli, F, Franceschi, E, Gruppuso, A, Paoletti, D, Procopio, P, Maino, D, Bersanelli, M, Tomasi, M, Cappellini, B, Donzelli, S, Stivoli, F, Morisset, N, Rohlfs, R, Binko, P, Meharga, MT, Türler, M, Chen, X, Huynh, M, Puget, J-L, Bouchet, FR, Efstathiou, G, Valiviita, J, Donzelli, S, Eriksen, HK, Hansen, FK, Lilje, PB, Génova-Santos, RT, Gómez, F, Rebolo, R, Rubiño-Martín, JA, López-Caniego, M, Barreiro, RB, Curto, A, Diego, JM, Herranz, D, Martínez-González, E, Vielva, P, Górski, KM, Keskitalo, R, Lawrence, CR, Bartlett, JG, Colombo, L, Gaier, TC, Jewell, J, Mitra, S, Pagano, L, Pearson, D, Pietrobon, D, Prézeau, G, Rocha, G, Seiffert, MD, Wade, LA, Leahy, JP, Davies, RD, Davis, RJ, Dickinson, C, Watson, R, Wilkinson, A, Lamarre, J-M, Borrill, J, Kisner, TS, Smoot, GF, Knoche, J, Matthai, F, Reinecke, M, Banday, AJ, Dörl, U, Enßlin, TA, Hell, R, Hovest, W, Rachen, JP, Robbers, G, White, SDM, Tuovinen, J, Baccigalupi, C, Bonavera, L, De Zotti, G, Dick, J, González-Nuevo, J, Leach, S, Perrotta, F, Danese, L, Pettorino, V, Borrill, J, Paladini, R, Banday, AJ & Górski, KM 2011, 'Planck early results. V. The Low Frequency Instrument data processing', Astronomy and Astrophysics, vol. 536, pp. A5. https://doi.org/10.1051/0004-6361/201116484

TY - JOUR

T1 - Planck early results. V. The Low Frequency Instrument data processing

AU - Poutanen, T.

AU - Lähteenmäki, A.

AU - León-Tavares, J.

AU - Natoli, P.

AU - Polenta, G.

AU - Falvella, M.C.

AU - Bartlett, J.G.

AU - Smoot, G.F.

AU - Stompor, R.

AU - Bonavera, L.

AU - Bedini, L.

AU - Salerno, E.

AU - Banday, A.J.

AU - Paladini, R.

AU - Prézeau, G.

AU - Rocha, G.

AU - Seiffert, M.D.

AU - Lilje, P.B.

AU - Nørgaard-Nielsen, Hans Ulrik

AU - Toffolatti, L.

AU - Cruz, M.

AU - Moss, A.

AU - Scott, D.

AU - Colombo, L.

AU - Keihänen, E.

AU - Keskitalo, R.

AU - Kurki-Suonio, H.

AU - Poutanen, T.

AU - Suur-Uski, A.-S.

AU - Juvela, M.

AU - Savelainen, M.

AU - Smoot, G.F.

AU - Knox, L.

AU - Meinhold, P.R.

AU - Zonca, A.

AU - Leonardi, R.

AU - Lubin, P.M.

AU - Silk, J.I.

AU - Bartolo, N.

AU - Matarrese, S.

AU - Melchiorri, A.

AU - Maino, D.

AU - Bersanelli, M.

AU - Mennella, A.

AU - Tomasi, M.

AU - Gregorio, A.

AU - Natoli, P.

AU - Cabella, P.

AU - De Gasperis, G.

AU - De Troia, G.

AU - Migliaccio, M.

AU - Quercellini, C.

AU - Vittorio, N.

AU - Marinucci, D.

AU - Génova-Santos, R.T.

AU - Rebolo, R.

AU - Rubiño-Martín, J.A.

AU - Leonardi, R.

AU - Tauber, J.A.

AU - Bennett, K.

AU - Bremer, M.

AU - Giardino, G.

AU - Leonardi, R.

AU - Sternberg, J.

AU - Partridge, B.

AU - Kurki-Suonio, H.

AU - Poutanen, T.

AU - Suur-Uski, A.-S.

AU - Lähteenmäki, A.

AU - Savelainen, M.

AU - Tofani, G.

AU - Umana, G.

AU - Bonaldi, A.

AU - De Zotti, G.

AU - Massardi, M.

AU - Polenta, G.

AU - Zacchei, A.

AU - Frailis, M.

AU - Galeotta, S.

AU - Maris, M.

AU - Mennella, A.

AU - Pasian, F.

AU - Tavagnacco, D.

AU - Gasparo, F.

AU - Maggio, G.

AU - Vuerli, C.

AU - Burigana, C.

AU - Butler, R.C.

AU - Cuttaia, F.

AU - Mandolesi, N.

AU - Morgante, G.

AU - Natoli, P.

AU - Ricciardi, S.

AU - Sandri, M.

AU - Terenzi, L.

AU - Villa, F.

AU - De Rosa, A.

AU - Finelli, F.

AU - Franceschi, E.

AU - Gruppuso, A.

AU - Paoletti, D.

AU - Procopio, P.

AU - Maino, D.

AU - Bersanelli, M.

AU - Tomasi, M.

AU - Cappellini, B.

AU - Donzelli, S.

AU - Stivoli, F.

AU - Morisset, N.

AU - Rohlfs, R.

AU - Binko, P.

AU - Meharga, M.T.

AU - Türler, M.

AU - Chen, X.

AU - Huynh, M.

AU - Puget, J.-L.

AU - Bouchet, F.R.

AU - Efstathiou, G.

AU - Valiviita, J.

AU - Donzelli, S.

AU - Eriksen, H.K.

AU - Hansen, F.K.

AU - Lilje, P.B.

AU - Génova-Santos, R.T.

AU - Gómez, F.

AU - Rebolo, R.

AU - Rubiño-Martín, J.A.

AU - López-Caniego, M.

AU - Barreiro, R.B.

AU - Curto, A.

AU - Diego, J.M.

AU - Herranz, D.

AU - Martínez-González, E.

AU - Vielva, P.

AU - Górski, K.M.

AU - Keskitalo, R.

AU - Lawrence, C.R.

AU - Bartlett, J.G.

AU - Colombo, L.

AU - Gaier, T.C.

AU - Jewell, J.

AU - Mitra, S.

AU - Pagano, L.

AU - Pearson, D.

AU - Pietrobon, D.

AU - Prézeau, G.

AU - Rocha, G.

AU - Seiffert, M.D.

AU - Wade, L.A.

AU - Leahy, J.P.

AU - Davies, R.D.

AU - Davis, R.J.

AU - Dickinson, C.

AU - Watson, R.

AU - Wilkinson, A.

AU - Lamarre, J.-M.

AU - Borrill, J.

AU - Kisner, T.S.

AU - Smoot, G.F.

AU - Knoche, J.

AU - Matthai, F.

AU - Reinecke, M.

AU - Banday, A.J.

AU - Dörl, U.

AU - Enßlin, T.A.

AU - Hell, R.

AU - Hovest, W.

AU - Rachen, J.P.

AU - Robbers, G.

AU - White, S.D.M.

AU - Tuovinen, J.

AU - Baccigalupi, C.

AU - Bonavera, L.

AU - De Zotti, G.

AU - Dick, J.

AU - González-Nuevo, J.

AU - Leach, S.

AU - Perrotta, F.

AU - Danese, L.

AU - Pettorino, V.

AU - Borrill, J.

AU - Paladini, R.

AU - Banday, A.J.

AU - Górski, K.M.

PY - 2011

Y1 - 2011

N2 - We describe the processing of data from the Low Frequency Instrument (LFI) used in production of the Planck Early Release Compact Source Catalogue (ERCSC). In particular, we discuss the steps involved in reducing the data from telemetry packets to cleaned, calibrated, time-ordered data (TOD) and frequency maps. Data are continuously calibrated using the modulation of the temperature of the cosmic microwave background radiation induced by the motion of the spacecraft. Noise properties are estimated from TOD from which the sky signal has been removed using a generalized least square map-making algorithm. Measured 1/f noise knee-frequencies range from ~100 mHz at 30 GHz to a few tens of mHz at 70GHz. A destriping code (Madam) is employed to combine radiometric data and pointing information into sky maps, minimizing the variance of correlated noise. Noise covariance matrices required to compute statistical uncertainties on LFI and Planck products are also produced. Main beams are estimated down to the ≈ -10dB level using Jupiter transits, which are also used for geometrical calibration of the focal plane. © ESO, 2011.

AB - We describe the processing of data from the Low Frequency Instrument (LFI) used in production of the Planck Early Release Compact Source Catalogue (ERCSC). In particular, we discuss the steps involved in reducing the data from telemetry packets to cleaned, calibrated, time-ordered data (TOD) and frequency maps. Data are continuously calibrated using the modulation of the temperature of the cosmic microwave background radiation induced by the motion of the spacecraft. Noise properties are estimated from TOD from which the sky signal has been removed using a generalized least square map-making algorithm. Measured 1/f noise knee-frequencies range from ~100 mHz at 30 GHz to a few tens of mHz at 70GHz. A destriping code (Madam) is employed to combine radiometric data and pointing information into sky maps, minimizing the variance of correlated noise. Noise covariance matrices required to compute statistical uncertainties on LFI and Planck products are also produced. Main beams are estimated down to the ≈ -10dB level using Jupiter transits, which are also used for geometrical calibration of the focal plane. © ESO, 2011.

U2 - 10.1051/0004-6361/201116484

DO - 10.1051/0004-6361/201116484

M3 - Journal article

SN - 0004-6361

VL - 536

SP - A5

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

ER -

Planck early results. V. The Low Frequency Instrument data processing

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