Results 31 to 40 of about 211,766 (269)
A Catalog of Active Galactic Nuclei from the First 1.5 Gyr of the Universe
Frontiers in Astronomy and Space Sciences, 2017 Active galactic nuclei (AGN) are prominent astrophysical objects that can be observed throughout the whole Universe. To understand the underlying physical processes and the different appearance of AGN types, extensive samples are needed.
Krisztina Perger +3 more
doaj +1 more source
Russian Virtual Observatory: Data Sources
Open Astronomy, 2016 The purpose of this review is to analyze main directions of creation and functioning of major data sources developed by Russian astronomers or with their participation and to compare them with the worldwide trends in these fields. We discuss astronomical
Malkov O. +12 more
doaj +1 more source
Automatic Classification of Variable Stars in Catalogs with missing data
, 2013 We present an automatic classification method for astronomical catalogs with missing data. We use Bayesian networks, a probabilistic graphical model, that allows us to perform inference to pre- dict missing values given observed data and dependency ...
Pichara, Karim, Protopapas, Pavlos
core +1 more source
The Two-Point Angular Correlation Function and BATSE Sky Exposure [PDF]
, 1997 The Two-Point Angular Correlation Function is a standard analysis tool used to study angular anisotropies. Since BATSE's sky exposure (the angular sampling of gamma-ray bursts) is anisotropic, the TPACF should at some point identify anisotropies in BATSE
Chen, Xiaoling, Hakkila, Jon
core +3 more sources
Meet the family − the catalog of known hot subdwarf stars
Open Astronomy, 2017 In preparation for the upcoming all-sky data releases of the Gaia mission, we compiled a catalog of known hot subdwarf stars and candidates drawn from the literature and yet unpublished databases.
Geier Stephan +8 more
doaj +2 more sources
Catalog design, catalog maintenance, catalog governance
Library Collections, Acquisitions, & Technical Services, 2000 The design of library catalogs and the maintenance of their contents equals catalog governance, that is, professional responsibility for the catalog. The design of library catalogs and their contents are an example of the standards that are the hallmark of modern librarianship.
openaire +2 more sources
Catalogs of Compact Groups of Galaxies from the Enhanced SDSS DR12
, 2016 We apply a friends-of-friends algorithm to an enhanced SDSS DR12 spectroscopic catalog including redshift from literature to construct a catalog of $1588~N\ge3$ compact groups of galaxies containing 5179 member galaxies and covering the redshift range $0.
Geller, Margaret J. +4 more
core +1 more source
Evaluation of the b Maps on the Faults of the Major (M > 7) South California Earthquakes
Earth and Space ScienceWe use the Godano et al. (2022, https://doi.org/10.1029/2021ea002205) method for evaluating the b maps of the faults associated with the largest earthquakes M ≥ 7.0 that occurred in California.
V. Convertito, A. Tramelli, C. Godano
doaj +1 more source
Consolidation of the Gaia catalogue with Chinese Space Station Telescope astrometry
Frontiers in Astronomy and Space Sciences, 2022 The issue of preservation and improvement of the Gaia catalogue throughout the next few decades is addressed. The goal of this study is to evaluate the feasibility of astrometric parameter update, for objects already in the catalogue, by inclusion of new
M. Gai +6 more
doaj +1 more source
The newfound relationship between extrachromosomal DNAs and excised signal circles
FEBS Letters, EarlyView.Extrachromosomal DNAs (ecDNAs) contribute to the progression of many human cancers. In addition, circular DNA by‐products of V(D)J recombination, excised signal circles (ESCs), have roles in cancer progression but have largely been overlooked. In this Review, we explore the roles of ecDNAs and ESCs in cancer development, and highlight why these ...
Dylan Casey, Zeqian Gao, Joan Boyes
wiley +1 more source