GLOBCLUST - Milky Way Globular Clusters Catalog (December 2010 Version)

Overview

This is the Catalog of Parameters for Milky Way Globular Clusters (December 2010 Version) that was compiled by William E. Harris of McMaster University. This is the first update since 2003 and the biggest single revision since the original version of the catalog published in 1996. The list now contains a total of 157 objects classified as globular clusters. Major upgrades have been made especially to the cluster coordinates, metallicities, and structural profile parameters, and the list of parameters now also includes the central velocity dispersion.

This table contains basic parameters on distances, velocities, metallicities, luminosities, colors, and dynamical parameters for over 150 objects that are regarded as globular clusters in the Milky Way galaxy.

Please acknowledge the use of this catalog in any published work you derive from it. The proper reference to the literature is the published paper (Harris, W.E. 1996, AJ, 112, 1487) which briefly describes the setup of the catalog. When you cite it in your text, please use "Harris 1996 (2010 edition)". The author would also greatly appreciate receiving any new information, in published or preprint form, which would help him to keep the list up to date (contact W. E. Harris at harris@physics.mcmaster.ca).

A full discussion of the sources used in the creation of this catalog and of the parameters that it contains can be found in the file: http://physwww.mcmaster.ca/~harris/mwgc.ref.

Catalog Bibcode

1996AJ....112.1487H

References

This is the December 2010 version of the Catalog of Parameters for Milky Way Globular Clusters. The original published reference for this catalog and the reference for the 2010 updated version are:

A catalog of parameters for globular clusters in the Milky Way
     Harris W.E.
    <Astron. J. 112, 1487 (1996)>
    =1996AJ....112.1487H        (SIMBAD/NED BibCode)

A new catalog of parameters of globular clusters in the Milky Way
     Harris W.E.
    <eprint arXiv:1012.3224>
    =2010arXiv1012.3224H        (SIMBAD/NED BibCode)

Provenance

This table was originally ingested by the HEASARC circa 1995. It was last updated by the HEASARC in February 2014 based on an electronic version (dated December 2010) copied from the file http://physwww.mcmaster.ca/~harris/mwgc.dat.

Notice

                     COPYRIGHT NOTICE!

THE DATA IN THIS CATALOG ARE SUPPLIED FREE OF CHARGE TO
ALL USERS.  ANY THIRD PARTY WHO SUPPLIES THIS CATALOG IN TURN TO
OTHER USERS MUST REFER TO THE ORIGINAL SOURCE, WHICH IS THE WEBSITE
http://physwww.mcmaster.ca/~harris/Databases.html
AND MUST DO SO WITHOUT CHARGE OF ANY FEE.

Parameters

Name
The commonly used name of the globular cluster.

Alt_Name
An alternative commonly used name of the globular cluster.

RA
The Right Ascension of the center of the cluster in the specified equinox. This was given in equinox 2000 and with varying precision in the originating table. At present the center coordinates for the clusters are now uncertain to typically 1-2 arcseconds, and better than 1" in a few cases that have attracted especially intensive study.

Dec
The Declination of the center of the cluster in the specified equinox. This was given in equinox 2000 and with varying precision in the originating table. At present the center coordinates for the clusters are now uncertain to typically 1-2 arcseconds, and better than 1" in a few cases that have attracted especially intensive study.

LII
The Galactic Longitude of the center of the cluster.

BII
The Galactic Latitude of the center of the cluster.

Helio_Distance
The distance of the cluster from the Sun, in kiloparsecs (kpc).

Galcen_Distance
The distance of the cluster from the Galactic Center, in kiloparsecs (kpc), assuming that the distance of the Sun from the Galactic Center R₀ is 8.0 kpc.

X_Distance
The distance component X in a Sun-centered coordinate system, in kiloparsecs (kpc), where X points toward the Galactic center, Y points in the direction of the Galactic rotation, and Z points towards the North Galactic Pole.

Y_Distance
The distance component Y in a Sun-centered coordinate system, in kiloparsecs (kpc), where X points toward the Galactic center, Y points in the direction of the Galactic rotation, and Z points towards the North Galactic Pole.

Z_Distance
The distance component Z in a Sun-centered coordinate system, in kiloparsecs (kpc), where X points toward the Galactic center, Y points in the direction of the Galactic rotation, and Z points towards the North Galactic Pole.

Metallicity
The cluster metallicity, [Fe/H], relative to the solar value.

Num_Metallicity_Measures
The 'weight' of the mean cluster metallicity, essentially the number of independent [Fe/H] measurements averaged together for the quoted value. See the bibliography at http://physwww.mcmaster.ca/~harris/mwgc.ref for a full description

Reddening
The foreground reddening, E(B-V), in the direction of the globular cluster, in magnitudes.

HB_Vmag
The V magnitude level of the cluster horizontal branch (or of the cluster's RR Lyrae variables).

App_Distance_Mod
The apparent visual distance modulus, (m-M)_V, of the cluster, in magnitudes.

Vmag
The integrated V magnitude of the cluster, V_t.

Abs_Vmag
The absolute visual magnitude (cluster luminosity) of the cluster, M_(V,t) = V_t -(m-M)_V.

UB_Color
The integrated U-B color index of the cluster (uncorrected for reddening).

BV_Color
The integrated B-V color index of the cluster (uncorrected for reddening).

VR_Color
The integrated V-R color index of the cluster (uncorrected for reddening).

VI_Color
The integrated V-I color index of the cluster (uncorrected for reddening).

Spect_Type
The spectral type of the integrated cluster light..

Ellipticity
The projected ellipticity or eccentricity of the cluster e = (1 - b/a), where a and b are the semi-major and semi-minor axes of the cluster light profile, respectively. This parameter is a measure of the projected shape of the cluster.

Radial_Velocity
The heliocentric radial velocity of the cluster, in km/s.

Radial_Velocity_Error
The observational (internal) uncertainty in the radial velocity of the cluster, in km/s.

LSR_Radial_Velocity
The radial velocity of the cluster relative to the Solar Local Standard of Rest, in km/s.

Central_Sigma_V
The central velocity dispersion of the cluster, sigma_v, in km/s. The velocity dispersion as quoted in the catalog is the estimated central value (at or near r = 0), sometimes relying on small model extrapolations from velocity or proper motion data within the cluster core, or in the best cases from the complete velocity dispersion profile.

Central_Sigma_V_Error
The observational (internal) uncertainty in the central velocity dispersion, in km/s.

Central_Concentration
The King model central concentration, c = log(r_t / r_c), of the cluster, where r_t is the tidal radius of the cluster and r_c is the core radius of the cluster.

Core_Collapse_Flag
A flag that is set to 'c' to denote a likely core-collapsed cluster or to 'c:' to denote a possible core-collapsed cluster.

Core_Radius
The core radius r_c of the cluster, in arcminutes.

Half_Light_Radius
The half-light radius of the cluster, in arcminutes.

Cent_Surf_Brightness
The central surface brightness of the cluster, in V magnitudes per square arcsecond.

Log_Lum_Density
The logarithm (base 10) of the central luminosity density of the cluster, in units of Solar luminosities per cubic parsec (L_sun / pc³).

Log_Core_Relaxtime
The logarithm (base 10) of the core relaxation time of the cluster, in years.

Log_HMR_Relaxtime
The logarithm (base 10) of the median relaxation time (the value at the half-light radius) of the cluster, in years.

Class
The HEASARC Browse object classification. All objects in this catalog have been given the (same) class, globular cluster.

Contact Person

Questions regarding the GLOBCLUST database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:28:06 EDT