SIMBAD references

2001AJ....122.1289T - Astron. J., 122, 1289-1297 (2001/September-0)

H-band and spectroscopic properties of A1644.


Abstract (from CDS):

We discuss H-band (1.65 µm) near-infrared photometry of the central 9 h–2 Mpc2 of Abell 1644 (A1644) to a limiting M_H_~M*H+3 (throughout this paper H0=100 h km.s–1 Mpc–1). There are 861 galaxies in the photometric survey region. We also measured radial velocities of 155 galaxies; 141 of these are cluster members within 2.44 h–1 Mpc of the cluster center. The completeness limit of the spectroscopic survey is H∼13 (MH∼M*H). The cluster velocity dispersion of σ∼1000 km.s–1 remains constant out to the limiting radius. We find no evidence for substructure in the cluster. The cluster mass within R=2.4 h–1 Mpc is 7.6±1.3x1014 h^ -1^ M. We compute the cluster luminosity function; the Schechter parameters α=-1.14±0.08 and M*H=-24.3±0.2 (with h=0.5) agree well with other H-band luminosity functions. From the virial theorem and the caustic method we compute one of the first mass-to-light ratios at H; the result is M/LH=82-127 h M/L within 1.5 h–1 Mpc. This ratio corresponds to 374-579 h M/L at R. The agreement of our IR measurement with previous M/L determinations indicates that at low redshift dust and young stellar populations may produce only negligible systematic errors in optical mass-to-light ratios.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual (A1644) - Galaxies: Luminosity Function, Mass Function

VizieR on-line data: <Available at CDS (J/AJ/122/1289): table1.dat table2.dat>

Nomenclature: Tables 1, 2: [TGK2001] JHHMMSS.s+DDMMSS.s N=861.

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

CDS comments: Objects not in Simbad, too many errors in positions.

Simbad objects: 126

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