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POLYCOMP: Efficient and configurable compression of astronomical timelines
Tomasi, M.
This paper describes the implementation of polycomp, a open-sourced, publicly available program for compressing one-dimensional data series in tabular format. The program is particularly suited for compressing smooth, noiseless streams of data like pointing information, as one of the algorithms it implements applies a combination of least squares …
Analogue Simulation and Orbital Solving Algorithm of Astrometric Exoplanet Detection
Ji, J. H.; Huang, P. H.
Astrometry is an effective method to detect exoplanets. It has many advantages that other detection methods do not bear, such as providing three dimensional planetary orbit and determining the planetary mass. Astrometry will enrich the sample of exoplanets. As the high-precision astrometric satellite Gaia (Global Astrometry interferometer for Astr…
The far-infrared emission of the radio-loud quasar 3C 318
Peletier, R. F.; Barthel, P. D.; Podigachoski, P. +1 more
3C 318, a radio-loud quasar at z = 1.574, is a subgalactic-sized radio source, and a good test-bed for the interplay between black hole and galaxy growth in the high-z Universe. Based on its IRAS, ISO, and SCUBA detections, it has long been considered as one of the most intrinsically luminous (LIR > 1013 L⊙) inf…
The peculiar optical-UV X-ray spectra of the X-ray weak quasar PG 0043+039
Talavera, A.; Schartel, N.; Rodríguez-Pascual, P. M. +4 more
Context. The object PG 0043+039 has been identified as a broad absorption line (BAL) quasar based on its UV spectra. However, this optical luminous quasar has not been detected before in deep X-ray observations, making it the most extreme X-ray weak quasar known today.
Aims: This study aims to detect PG 0043+039 in a deep X-ray exposure. The …
Microwave observations of a large-scale coronal wave with the Nobeyama radioheliograph
Mann, G.; Shibasaki, K.; Warmuth, A. +1 more
Context. Large-scale globally propagating waves in the solar corona have been studied extensively, mainly using extreme ultraviolet (EUV) observations. In a few events, corresponding wave signatures have been detected in microwave radioheliograms provided by the Nobeyama radioheliograph (NoRH). Several aspects of these observations seem to contrad…
Quasi-continuous reconnection accompanied by FTEs during IMF Bz ≈ 0 nT observed by Double Star TC-1 at the dawnside magnetopause
Shen, Chao; Chen, Tao; Phan, Tai +6 more
During a one-hour interval of interplanetary magnetic field (IMF) Bz ≈ 0 nT, the equatorial spacecraft Double Star TC-1 encountered the dawn flank magnetopause many times at the magnetic local time (MLT) of about 08:00 and the latitude of about -27°. During each encounter, reconnection jets were observed with their velocities up to more…
Variability of the emission line fluxes and ratios of HH 1/2
Raga, A. C.; Reipurth, B.; Castellanos-Ramírez, Bally, J.
We compare spectrophotometric data of HH 1 and 2 obtained in 1978 (by Brugel et al. 1981a) with the emission line fluxes from calibrated Hubble Space Telescope (HST) images obtained in 1994 and 2014. This comparison shows that the emission line ratios of these objects have remained surprisingly invariant during the past 36 years. On the other hand…
Analysis of Co-spatial UV-optical HST/STIS Spectra of Planetary Nebula NGC 3242
Corradi, Romano L. M.; Balick, Bruce; Shaw, Richard A. +4 more
This project sought to consider two important aspects of the planetary nebula NGC 3242 using new long-slit HST/STIS spectra. First, we investigated whether this object is chemically homogeneous by spatially dividing the slit into different regions and calculating the abundances of each region. The major result is that the elements of He, C, O, and…
Ptolemy operations at the surface of a comet, from planning to reality
Andrews, D. J.; Sheridan, S.; Wright, I. P. +3 more
Ptolemy is a Gas Chromatograph-Isotope Ratio-Mass Spectrometer (GC-IR-MS) aboard the Philae lander element of the Rosetta mission to comet 67P/Churyumov-Gerasimenko. Developed to determine the chemical and stable light isotopic composition of cometary material, Ptolemy was conceived as a highly flexible instrument able to accommodate changes in op…
First performance of the GeMS + GMOS system - 1. Imaging
Hibon, Pascale; Rigaut, Francois; Carrasco, Eleazar R. +6 more
During the commissioning of the Gemini MCAO System (GeMS), we had the opportunity to obtain data with the Gemini Multi-Object Spectrograph (GMOS), the most utilized instrument at Gemini South Observatory, in 2012 March and May. Several globular clusters were observed in imaging mode that allowed us to study the performance of this new and untested…