You can give a value to one (or more) of the following searches criterium cluster name, RA, DEC, Radius, Flux, Luminosity, Temperature, Bibliography.
Note that the system will search for clusters and/or references
which correspond to ALL the criteria you give.
Criteria can be physical (cluster name, RA, DEC, Radius, Flux, Luminosity, Temperature) or bibliographic (a list of keywords )
Query by file :
If you want to querry BAX for many clusters or arround many possitions, you have the possibility to browse a file containing a list, which name is free but should have the extension .txt (like myquerry.txt)
For the query By Name, the file should contain one
cluster name per line
For the query By Position, the file should contain
one position and size per line with a semicolon (;)
as a separator :
The name should be given following the NED format.
Examples of cluster name input:
For Abell clusters: ABELL0085, ABELL 0085, A85, A 85, a85, a 85, abell 0085, abell0085
Using wildcard '*" character will cause a template search (all clusters contained in BAX). If the wildcard character is used in front of a near cluster name, the list of synonyms for the specified cluster name are given (Ex: RX* will return all cluster name begining with RX). The '*' is not allowed within a word.
Some examples for non-Abell clusters:
Zwicky clusters : ZwCl 1021.0+0426
Clusters name with CL is used instead of the nomencalture ClG, CLG.
Is retrieved from NED and the reference therein . It can happen that the redshift is not available in NED database, in this case we search for it in the literature.
: Only canonical
values of Fx, Lx and Tx are given. These
canonical values are choosen among
precise one and/or the latest published measurements.
: gives all the measurements published in the literature.
that Fx is given as originally quoted in the reference.
|Note that the Hubble constant is
to H_o= 50km <s/Mpc and the
matter density Omega_M = 1.0
BAX searches in the bibliographic database by keywords. BAX returns the bibliographic references associated with at least one of the selected keyword.
The keywords are divided into 4 main categories :
"By parameters" query menu, the relation between the keywords from the
menu ( Observatory) is an
OR relation. Inside the same checkbox list, the relation is
AND. The relation between the 4 lists (srolling menu and 3
lists) is AND.
The definition of each keyword is given in the following table.
|Observatory||Ariel V, ASCA, BeppoSAX, Chandra, Einstein, EXOSAT, Ginga HEAO-1, ROSAT, Tenma, Uhuru, XMM|
|Observational Techniques||X-Rays photometry, X-Rays
spectroscopy, X-Rays imaging,
Spatially resolved spectroscopy, Optical, Lensing, UV, SZ, Radio
|Fx||unabsorbed X-ray flux in ROSAT band 0.1-2.4 keV in units 10 -12 ergs s -1cm-2|
|Lbol||X-ray bolometric luminosity in units of 1044ergs s -1|
|Lx||X-ray luminosity in the ROSAT band (0.1-2.4 keV) in 1044 ergs s -1|
|M_gas||Gas mass in a radius r|
|M_tot||Total mass in a radius r|
|Tx||X-ray gas temperature in keV|
|Temperature profile||Radial profile of the X-ray gas temperature|
|Temperature map||X-ray temperature map|
|Abundance profile||Radial profile of the metallicity|
|Beta||is the slope of the gas density profile derived from the b-model fitting|
|Relative abundances||ex: [O/Fe], [Mg/Fe]....|
|Count rate||Counts rate in cps/s|
|M_gas||Gas mass inside a given radius|
|M_tot||Total gravitating mass inside a given radius|
|M_dot||The mass deposited in the cluster center due to cooling flows|
|Sx profile||Surface brightness profile expresses in units of cts s-1 arcmin-2|
|ne_o||Central gas density|
|Velocity dispersion||Velocity dispersion derived from radial velocities measurement|
|L_opt||Total optical luminosity|
|R_E||Einstein ring radius in lensing image|
|Shear||defines the lensing effect|
|Shocks||presence of shocks|
|Mergers||physical state of a cluster which is either in process of merging with a subcluster or which has experienced a merger (collision)|
|Morphology||defines the shape of a cluster (elongated, spherical, smooth, regular, irregular, etc...)|
|Cooling flows||presence of cooling flow|
|Ellipticity||defines the geometry of a cluster e=0 if a cluster is not elongated (spherical case)|
|X-Rays image||X-rays image obtained from the analysis of fits tables|
|Optical image||image obtained from optical observations|
|Substructure||inhomegeneities or presence of clumps in clusters|
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