TY - JOUR
T1 - Strong lensing constraints on the properties of cluster galaxies
AU - Williams, Liliya L.R.
AU - Saha, Prasenjit
PY - 2004
Y1 - 2004
N2 - A recently discovered quadruply-imaged QSO, SDSS J1004+4112 (Inada et al. 2003; Oguri et al. 2004) in the core of a z + 68 galaxy cluster has an unprecedented image separation of - 13--. This lens gives us a unique opportunity to study the detailed mass distribution in the central regions of this cluster. We present free-form reconstructions of the lens using recently developed methods. The projected mass within 100 kpc is well-constrained as 5 ± 1×1013M · , consistent with previous simpler models. Unlike previous work, however, we are able to detect structures in the lens associated with cluster galaxies. We estimate the mass associated with these galaxies, and show that they contribute not more than about 10% of the total cluster mass within 100 kpc. Typical galaxy masses, combined with typical luminosities yield a rough estimate of their mass-To-light ratio, which is ≲10, implying that these galaxies consist mostly of stars, and possess little dark matter.
AB - A recently discovered quadruply-imaged QSO, SDSS J1004+4112 (Inada et al. 2003; Oguri et al. 2004) in the core of a z + 68 galaxy cluster has an unprecedented image separation of - 13--. This lens gives us a unique opportunity to study the detailed mass distribution in the central regions of this cluster. We present free-form reconstructions of the lens using recently developed methods. The projected mass within 100 kpc is well-constrained as 5 ± 1×1013M · , consistent with previous simpler models. Unlike previous work, however, we are able to detect structures in the lens associated with cluster galaxies. We estimate the mass associated with these galaxies, and show that they contribute not more than about 10% of the total cluster mass within 100 kpc. Typical galaxy masses, combined with typical luminosities yield a rough estimate of their mass-To-light ratio, which is ≲10, implying that these galaxies consist mostly of stars, and possess little dark matter.
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M3 - Conference article
AN - SCOPUS:85049665695
SN - 1824-8039
VL - 2004-October
JO - Proceedings of Science
JF - Proceedings of Science
M1 - 076
T2 - 2004 Baryons in Dark Matter Halos, BDMH 2004
Y2 - 5 October 2004 through 9 October 2004
ER -