The Unified Astronomy Thesaurus (UAT) provides a comprehensive,
interlinked set of concepts relevant for astronomy and astrophysics using
SKOS. It is taken up in the Virtual Observatory at least for registry
subject keywords. For various reasons, it is desirable to have the UAT
available subject to the constraints laid down in the IVOA Vocabularies
in the VO 2 specification. This Note describes the rationale and the
details of the UAT adoption by the IVOA.
Astrophysics Data System: Authority Name Registration
Short Name:
ADS
Date:
16 Sep 2007 05:13:00
Publisher:
NASA Astrophysics Data System
Description:
This resource represents the Naming Authority for the Astrophysics Data System (ADS). The ADS provides access to the astronomical literature. It is funded by NASA and hosted at the Harvard-Smithsonian Center for Astrophysics.
Authority Name for National Space Science Data Center
Short Name:
NSSDC2
Date:
04 Apr 2008 17:51:11
Publisher:
National Space Science Data Center
Description:
This naming authority is for identifying resources from the National Space Science Data Center. Note that a second authority name, nasa.gsfc.nssdc, is also used for NSSDC resources.
Authority Name for National Space Science Data Center
Short Name:
NSSDC
Date:
04 Apr 2008 17:51:04
Publisher:
National Space Science Data Center
Description:
This naming authority is for identifying resources from the National Space Science Data Center. Note that a second authority name, gov.nasa.gsfc.nssdc, is also used for NSSDC resources.
Authority Name for the World Data Center for Astronomy
Short Name:
WDC-Astronomy
Date:
04 Apr 2008 16:54:59
Publisher:
The World Data Center for Astronomy
Description:
This authority name is for identifying resources from the World Data Center for Astronomy, hosted at National Astronomical Observatory of China, Beijing, China
Query service for observation metadata for all CADC archival data holdings. This service
provides Table Access Protocol (TAP) API access to observation metadata conforming to the
Common Archive Observation Model (CAOM) and the IVOA ObsCore data model.
The current dynamic collections (new data arriving) include: CFHT, CFHTMEGAPIPE, DAO, DRAO, GEMINI, HST,
JCMT, NEOSSAT, OMM, TESS, VLASS.
The current static collections include: APASS, BLAST, CFHTTERAPIX, CFHTWIRWOLF,
CGPS, DAOPLATES, FUSE, HSTHLA, IRIS, MACHO, MOST, NGVS, UKIRT, VGPS.
The curent external collections (metadata only, data served by original data centre) include:
CHANDRA, NOAO, SDSS, SUBARU, XMM.
YouCat is a query service for catalogues hosted by CANFAR. This service
provides Table Access Protocol (TAP) API access to catalogues created by
project teams.
YouCat also implements a prototype VOSI-tables extension that allows users
to create, update table metadata add table content (rows), create indices,
and delete tables in the database. Users can also control access to their
own tables (public to allow anonymous querying, protected so only members
of specified groups can query, and private where only the owner can query).
Users who want to create tables must request an allocation (schema) by email
to support@canfar.net.
Currently available catalogues include: VLASS, CFHTLS, KiDS, PAndAS, RCSLens.
The CDPP (Centre de Données de la Physique des Plasmas) was created in 1998 jointly by CNES and INSU
as the French national data centre for natural plasmas of the solar system. The CDPP assures the long term preservation
of data obtained primarily from instruments built using French resources, and renders them readily accessible and
exploitable by the international community. The CDPP also provides services to enable on-line data analysis (AMDA),
3D data visualization in context (3DView), and a propagation tool which bridges solar perturbations to in-situ
measurements. The CDPP is involved in the development of interoperability, participates in several
Virtual Observatory projects, and supports data distribution for scientific missions (Solar Orbiter, JUICE).
This is IRSA's Hierarchical Progressive Survey (HiPS) node. HiPS is a hierarchical scheme for the description, stoage, and access of sky survey data. The system is based on hierarchical tiling of sky regions at finer and finer spatial resolution which facilitates a progressive view of a survey, and supports multi-resolution zooming and panning.
This is IRSA's implementation of version 2 of the IVOA Simple Image Access (SIA) protocol. Our SIA v2 service allows a rich variety of searches against IRSA's varied holdings.
IRSA Simple Spectral Access (SSA) Protocol Service
Short Name:
IRSA SSA
Date:
06 May 2021 17:44:00
Publisher:
NASA/IPAC Infrared Science Archive
Description:
This is IRSA's implementation of the IVOA Simple Spectral Access (SSA) protocol. Our SSA service allows a rich variety of searches against IRSA's varied holdings.
An IVOA Identifier is a globally unique name for a resource within the Virtual
Observatory. This name can be used to retrieve a unique description of the
resource from an IVOA-compliant registry or to identify an entity like a
dataset or a protocol without dereferencing the identifier. This document
describes the syntax for IVOA Identifiers as well as how they are created. The
syntax has been defined to encourage global-uniqueness naturally and to
maximize the freedom of resource providers to control the character content of
an identifier.
Registries provide a mechanism with which VO applications can discover and
select resources - first and foremost data and services - that are relevant for
a particular scientific problem. This specification defines an interface for
searching this resource metadata based on the IVOA's TAP protocol. It specifies
a set of tables that comprise a useful subset of the information contained in
the registry records, as well as the table's data content in terms of the XML
VOResource data model. The general design of the system is geared towards
allowing easy authoring of queries.
TITAN is a computer program for calculating the interactions of a dilute plane-parallel medium with electromagnetic radiation. It includes all atomic processes: absorption, recombination, diffusion, excitation, deexcitation of atoms and ions, heating and cooling of the gas, and it solves the radiation transfer, in order to obtain the spectra reemitted by the medium. It handles plan parallel slabs in non LTE steady state, for various physical conditions and various illuminations, valid in many astrophysical situations. It is specifically designed for warm-hot (8000 to 10**8 K) and thick media (till an electron scattering optical depth of several tens) emitting and absorbing in the X-ray range (density from 10**5 to 10**14 cm-3). It computes the physical parameters, ionisation degrees, temperature, density, and the spectrum of the radiated light in each point of the slab, by solving simultaneously the ionisation equations, the equations of statistical equilibrium, the thermal equations and the radiation transfer, using iteration processes.
The Multi-Order Coverage map method (MOC) is dedicated to specify arbitrary sky regions.
The goal is to be able to provide a very fast comparison mechanism between coverage maps.
The mechanism is based on the HEALPix sky tessellation algorithm.
It is essentially a simple way to map regions of the sky into hierarchically
grouped predefined cells.
A service in the Common Execution Architecture. This service provides one or more science applications which are separately registered. See the ManagedApplications element of this document for a list of applications.
This resource describes the community webapplication at MSSL. It hosts all the accounts and secure accounts of people organized at MSSL. And possibly other outside people of MSSL but associated with projects of MSSL.
Observation Data Model Core Components
and its Implementation in the Table Access Protocol
Date:
10 May 2017 08:00:00
Publisher:
IVOA
Description:
This document defines the core components of the Observation data model
that are necessary to perform data discovery when querying data centers
for astronomical observations of interest. It exposes use-cases to be carried out,
explains the model and provides guidelines for its implementation as a data access
service based on the Table Access Protocol (TAP).
It aims at providing a simple model easy to understand and to implement by data
providers that wish to publish their data into the Virtual Observatory. This
interface integrates data modeling and data access aspects in a single service and
is named ObsTAP. It will be referenced as such in the IVOA registries.
In this document, the Observation Data Model Core Components (ObsCoreDM) defines
the core components of queryable metadata required for global discovery of
observational data. It is meant to allow a single query to be posed to TAP
services at multiple sites to perform global data discovery without having to
understand the details of the services present at each site. It defines a minimal
set of basic metadata and thus allows for a reasonable cost of implementation by
data providers. As with most of the VO Data Models, ObsCoreDM makes use of STC,
Utypes, Units and UCDs. The ObsCoreDM can be serialized as a VOTable. ObsCoreDM
can make reference to more complete data models such as Characterisation DM,
Spectrum DM or Simple Spectral Line Data Model (SSLDM). ObsCore shares a large set
of common concepts with DataSet Metadata Data Model (Cresitello-Dittmar et al. 2016)
which binds together most of the data model concepts from the above models in a
comprehensive and more general frame work. This current specification on the
contrary provides guidelines for implementing these concepts using the TAP protocol
and answering ADQL queries. It is dedicated to global discovery.