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Xin Chen

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Publications associées (97)

Experimental Study on Wave Propagation Across a Rock Joint with Rough Surface

Jian Zhao, Yang Zou, Xin Chen

Joints are an important mechanical feature of rock masses. Their effect on wave propagation is significant in characterizing dynamic behaviors of discontinuous rock masses. An experimental study on wave propagation across artificial rock joint was carried ...

Springer Wien2015

Planck 2013 results. XXXII. The updated Planck catalogue of Sunyaev-Zeldovich sources

Julien Lesgourgues, Fabio Finelli, Xin Chen

We update the all-sky Planck catalogue of 1227 clusters and cluster candidates (PSZ1) published in March 2013, derived from detections of the Sunyaev-Zeldovich (SZ) effect using the first 15.5 months of Planck satellite observations. As an addendum, we del ...

Edp Sciences S A2015

Planck 2013 results. XVI. Cosmological parameters

Julien Lesgourgues, Fabio Finelli, Jan Hamann, Xin Chen

This paper presents the first cosmological results based on Planck measurements of the cosmic microwave background (CMB) temperature and lensing-potential power spectra. We find that the Planck spectra at high multipoles (l greater than or similar to 40) a ...

Edp Sciences S A2014

Planck 2013 results. XII. Diffuse component separation

Julien Lesgourgues, Fabio Finelli, Xin Chen

Planck has produced detailed all-sky observations over nine frequency bands between 30 and 857 GHz. These observations allow robust reconstruction of the primordial cosmic microwave background (CMB) temperature fluctuations over nearly the full sky, as wel ...

Edp Sciences S A2014

Planck 2013 results. V. LFI calibration

Julien Lesgourgues, Fabio Finelli, Xin Chen

We discuss the methods employed to photometrically calibrate the data acquired by the Low Frequency Instrument on Planck. Our calibration is based on a combination of the orbital dipole plus the solar dipole, caused respectively by the motion of the Planck ...

Edp Sciences S A2014

Planck 2013 results. I. Overview of products and scientific results

Slobodan Ilic, Julien Lesgourgues, Fabio Finelli, Jason Douglas McEwen, Jan Hamann, Ji Hyun Kim, Xin Chen

The European Space Agency's Planck satellite, dedicated to studying the early Universe and its subsequent evolution, was launched 14 May 2009 and has been scanning the microwave and submillimetre sky continuously since 12 August 2009. In March 2013, ESA an ...

Edp Sciences S A2014

Planck 2013 results. IX. HFI spectral response

Julien Lesgourgues, Fabio Finelli, Xin Chen

The Planck High Frequency Instrument (HFI) spectral response was determined through a series of ground based tests conducted with the HFI focal plane in a cryogenic environment prior to launch. The main goal of the spectral transmission tests was to measur ...

Edp Sciences S A2014

Planck 2013 results. XXX. Cosmic infrared background measurements and implications for star formation

Julien Lesgourgues, Fabio Finelli, Xin Chen

We present new measurements of cosmic infrared background (CIB) anisotropies using Planck. Combining HFI data with IRAS, the angular auto-and cross-frequency power spectrum is measured from 143 to 3000 GHz, and the auto-bispectrum from 217 to 545 GHz. The ...

Edp Sciences S A2014

Planck 2013 results. XIII. Galactic CO emission

Julien Lesgourgues, Fabio Finelli, Xin Chen

Rotational transition lines of CO play a major role in molecular radio astronomy as a mass tracer and in particular in the study of star formation and Galactic structure. Although a wealth of data exists for the Galactic plane and some well-known molecular ...

Edp Sciences S A2014

Planck 2013 results. II. Low Frequency Instrument data processing

Julien Lesgourgues, Fabio Finelli, Xin Chen

We describe the data processing pipeline of the Planck Low Frequency Instrument (LFI) data processing centre (DPC) to create and characterize full-sky maps based on the first 15.5 months of operations at 30, 44, and 70 GHz. In particular, we discuss the va ...

Edp Sciences S A2014

Zodiacal emission

Julien Lesgourgues, Fabio Finelli, Xin Chen

The Planck satellite provides a set of all-sky maps at nine frequencies from 30 GHz to 857 GHz. Planets, minor bodies, and di ff use interplanetary dust emission (IPD) are all observed. The IPD can be separated from Galactic and other emissions because Pla ...

Edp Sciences S A2014

Planck 2013 results. XXIX. The Planck catalogue of Sunyaev-Zeldovich sources

Julien Lesgourgues, Fabio Finelli, Xin Chen

We describe the all-sky Planck catalogue of clusters and cluster candidates derived from Sunyaev-Zeldovich (SZ) effect detections using the first 15.5 months of Planck satellite observations. The catalogue contains 1227 entries, making it over six times th ...

Edp Sciences S A2014

Planck 2013 results. VIII. HFI photometric calibration and mapmaking

Julien Lesgourgues, Fabio Finelli, Xin Chen

This paper describes the methods used to produce photometrically calibrated maps from the Planck High Frequency Instrument (HFI) cleaned, time-ordered information. HFI observes the sky over a broad range of frequencies, from 100 to 857 GHz. To obtain the b ...

Edp Sciences S A2014

High Frequency Instrument data processing

Julien Lesgourgues, Fabio Finelli, Xin Chen

We describe the processing of the 531 billion raw data samples from the High Frequency Instrument (HFI), which we performed to produce six temperature maps from the first 473 days of Planck-HFI survey data. These maps provide an accurate rendition of the s ...

Edp Sciences S A2014

Planck 2013 results. XXVIII. The Planck Catalogue of Compact Sources

Julien Lesgourgues, Fabio Finelli, Benjamin Andreas Walter, Xin Chen

The Planck Catalogue of Compact Sources (PCCS) is the catalogue of sources detected in the first 15 months of Planck operations, the "nominal" mission. It consists of nine single-frequency catalogues of compact sources, both Galactic and extragalactic, det ...

Edp Sciences S A2014