نتایج جستجو برای: astronomical catalogues
تعداد نتایج: 10370 فیلتر نتایج به سال:
Maraghe observatory was built by such engineers as Moayiededdin Orozi etc. under supervision of Khaje Nasireddin Tousi in 7th century AH. The most significant feature associated with Maraghe observatory is the fact that architecture is employed to achieve astronomical purposes in this site. The reason for preferring observatory by astronomers was the fact that these units are superior to wooden...
We describe the generation of single-band point source catalogues from submillimetre Herschel-SPIRE observations taken as part of the Science Demonstration Phase of the Herschel Multi-tiered Extragalactic Survey (HerMES). Flux densities are found by means of peak finding and the fitting of a Gaussian point-response function. With highly confused images, careful checks must be made on the comple...
The present work aims to validate the positions of solar filaments published in Annals Coimbra University Astronomical Observatory, currently Geophysical and Observatory Coimbra, corresponding years 1929 1941. Stonyhurst were obtained by an original method devised early 20th century that used a spherical calculator instrument, wood-made model Sun. We digital images spectroheliograms measure fil...
Machine learning has achieved an important role in the automatic classification of variable stars, and several classifiers have been proposed over last decade. These impressive performance astronomical catalogues. However, some scientific articles also shown that training data therein contain multiple sources bias. Hence, those on objects not belonging to is uncertain, potentially resulting sel...
ABSTRACT We present GLADE+, an extended version of the GLADE galaxy catalogue introduced in our previous paper for multimessenger searches with advanced gravitational-wave detectors. GLADE+ combines data from six separate but not independent astronomical catalogues: GWGC, 2MPZ, 2MASS XSC, HyperLEDA, and WISExSCOSPZ catalogues, SDSS-DR16Q quasar catalogue. To allow corrections CMB-frame redshift...
We present the Automated Photometry Of Transients (AutoPhOT) package, a novel automated pipeline that is designed for rapid, publication-quality photometry of astronomical transients. AutoPhOT built from ground up using Python 3 - with no dependencies on legacy software. Capabilities include aperture and point-spread-function photometry, template subtraction, calculation limiting magnitudes thr...
Interpreting and modelling astronomical catalogues requires an understanding of the catalogues’ completeness or selection function: what properties determine object’s probability being including in catalogue? Here we set out to empirically quantify overall catalogue Gaia ’s third data release (DR3). This task is not straightforward because all-sky optical survey with highest angular resolution ...
greater depths with the Palomar Sky Survey during the 1950s. Astronomers pored over these photographic plates to build catalogues of new classes of objects, such as George Abell’s catalogue of rich galaxy clusters and Berverly Lynds’s catalogues of interstellar clouds. These early catalogues, published on paper in specialised journals, laid the foundations for entire fields of modern astronomy....
This paper presents the third extension to the Very Large Baseline Array (VLBA) Calibrator Survey, containing 360 new sources not previously observed with very long baseline interferometry (VLBI). The survey, based on three 24 hour VLBA observing sessions, fills the areas on the sky above declination −45 where the calibrator density is less than one source within a 4 radius disk at any given di...
We present a result of cross-correlating the Infrared Astronomical Satellite Faint Source Catalogue (IRAS FSC) with the spectroscopic catalogues of galaxies in the Fourth Data Release of Sloan Digital Sky Survey (SDSS), the Final Data Release of 2dF Galaxy Redshift Survey (2dFGRS) and the Second Data Release of 6dF Galaxy Survey (6dFGS). We have identified 324 ultraluminous infrared galaxies (U...
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