Search Publications
The ESA Gaia Archive: Data Release 1
González-Núñez, J.; Gutiérrez-Sánchez, R.; Segovia, J. C. +4 more
The ESA Gaia mission is producing the most accurate source catalogue in astronomy to date. This represents a challenge in archiving to make the information and data accessible to astronomers in an efficient way, due to the size and complexity of the data. Also, new astronomical missions, taking larger and larger volumes of data, are reinforcing th…
Photo-z-SQL: Integrated, flexible photometric redshift computation in a database
Beck, R.; Szalay, A. S.; Csabai, I. +2 more
We present a flexible template-based photometric redshift estimation framework, implemented in C#, that can be seamlessly integrated into a SQL database (or DB) server and executed on-demand in SQL. The DB integration eliminates the need to move large photometric datasets outside a database for redshift estimation, and utilizes the computational c…
Enabling data science in the Gaia mission archive: The present-day mass function and age distribution
Sarro, L. M.; Berihuete, A.; Julbe, F. +2 more
Recent advances in large scale computing architectures enable new opportunities to extract value out of the vast amounts of data being currently generated. However, their successful adoption is not straightforward in areas like science, as there are still some barriers that need to be overcome. Those comprise (i) the existence of legacy code that …
A parallel model for SQL astronomical databases based on solid state storage. Application to the Gaia Archive PostgreSQL database
González-Núñez, J.; Gutiérrez-Sánchez, R.; Segovia, J. C. +3 more
Query planning and optimisation algorithms in most popular relational databases were developed at the times hard disk drives were the only storage technology available. The advent of higher parallel random access capacity devices, such as solid state disks, opens up the way for intra-machine parallel computing over large datasets.
We describe…Time-dependent tomographic reconstruction of the solar corona
Lamy, P.; Vibert, D.; Peillon, C. +2 more
Solar rotational tomography (SRT) applied to white-light coronal images observed at multiple aspect angles has been the preferred approach for determining the three-dimensional (3D) electron density structure of the solar corona. However, it is seriously hampered by the restrictive assumption that the corona is time-invariant which introduces sign…
MATISSE: A novel tool to access, visualize and analyse data from planetary exploration missions
Antonelli, L. A.; Giommi, P.; Capria, M. T. +2 more
The increasing number and complexity of planetary exploration space missions require new tools to access, visualize and analyse data to improve their scientific return.
ASI Science Data Center (ASDC) addresses this request with the web-tool MATISSE (Multi-purpose Advanced Tool for the Instruments of the Solar System Exploration), allowing the…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 …
The Gaia Attitude Star Catalog
Smart, R. L.
We describe the Attitude Star Catalog produced for the Gaia mission. This catalog is being used by Gaia for the first on-ground attitude reconstruction. Originally it was simply a subset of the Initial Gaia Source List but this subset did not meet the isolation requirements and it contained a significant number of double entries. As a result durin…
Spectral clustering for optical confirmation and redshift estimation of X-ray selected galaxy cluster candidates in the SDSS Stripe 82
Takey, A.; Mahmoud, E.; Shoukry, A.
We develop a galaxy cluster finding algorithm based on spectral clustering technique to identify optical counterparts and estimate optical redshifts for X-ray selected cluster candidates. As an application, we run our algorithm on a sample of X-ray cluster candidates selected from the third XMM-Newton serendipitous source catalog (3XMM-DR5) that a…
The IRAS PSC/FSC Combined Catalogue
Mickaelian, A. M.; Abrahamyan, H. V.; Knyazyan, A. V.
Optical identifications of a few thousands of IRAS sources showed that IRAS Point Source and IRAS Faint Source catalogues (PSC and FSC, respectively) contain many quasars and active galactic nuclei, late-type stars, planetary nebulae, variables, etc. To increase the efficiency of using IRAS PSC and FSC, which contain a lot of common sources, one n…