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.
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.