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Full-Text Articles in Physical Sciences and Mathematics
Comparing Dense Galaxy Cluster Redshift Surveys With Weak-Lensing Maps, Ho Seong Hwang, Margaret J. Geller, Antonaldo Diaferio, Kenneth J. Rines, J. Jabran Zahid
Comparing Dense Galaxy Cluster Redshift Surveys With Weak-Lensing Maps, Ho Seong Hwang, Margaret J. Geller, Antonaldo Diaferio, Kenneth J. Rines, J. Jabran Zahid
Physics & Astronomy
We use dense redshift surveys of nine galaxy clusters at z ~ 0.2 to compare the galaxy distribution in each system with the projected matter distribution from weak lensing. By combining 2087 new MMT/Hectospec redshifts and the data in the literature, we construct spectroscopic samples within the region of weak-lensing maps of high (70%-89%) and uniform completeness. With these dense redshift surveys, we construct galaxy number density maps using several galaxy subsamples. The shape of the main cluster concentration in the weak-lensing maps is similar to the global morphology of the number density maps based on cluster members alone, mainly …
A Redshift Survey Of The Strong-Lensing Cluster Abell 383, Margaret J. Geller, Ho Seong Hwang, Antonaldo Diaferio, Michael J. Kurtz, Dan Coe, Kenneth J. Rines
A Redshift Survey Of The Strong-Lensing Cluster Abell 383, Margaret J. Geller, Ho Seong Hwang, Antonaldo Diaferio, Michael J. Kurtz, Dan Coe, Kenneth J. Rines
Physics & Astronomy
Abell 383 is a famous rich cluster (z = 0.1887) imaged extensively as a basis for intensive strong- and weak-lensing studies. Nonetheless, there are few spectroscopic observations. We enable dynamical analyses by measuring 2360 new redshifts for galaxies with r Petro ≤ 20.5 and within 50' of the Brightest Cluster Galaxy (BCG; R.A.2000 = 42014125, decl.2000 = –03529228). We apply the caustic technique to identify 275 cluster members within 7 h –1 Mpc of the hierarchical cluster center. The BCG lies within –11 ± 110 km s–1 and 21 ± 56 h –1 kpc of the …