TY - JOUR
T1 - Galaxy halo truncation and giant ARC surface brightness reconstruction in the cluster MACSJ1206.2-0847
AU - Eichner, Thomas
AU - Seitz, Stella
AU - Suyu, Sherry H.
AU - Halkola, Aleksi
AU - Umetsu, Keiichi
AU - Zitrin, Adi
AU - Coe, Dan
AU - Monna, Anna
AU - Rosati, Piero
AU - Grillo, Claudio
AU - Balestra, Italo
AU - Postman, Marc
AU - Koekemoer, Anton
AU - Zheng, Wei
AU - Høst, Ole
AU - Lemze, Doron
AU - Broadhurst, Tom
AU - Moustakas, Leonidas
AU - Bradley, Larry
AU - Molino, Alberto
AU - Nonino, Mario
AU - Mercurio, Amata
AU - Scodeggio, Marco
AU - Bartelmann, Matthias
AU - Benitez, Narciso
AU - Bouwens, Rychard
AU - Donahue, Megan
AU - Infante, Leopoldo
AU - Jouvel, Stephanie
AU - Kelson, Daniel
AU - Lahav, Ofer
AU - Medezinski, Elinor
AU - Melchior, Peter
AU - Merten, Julian
AU - Riess, Adam
PY - 2013/9/10
Y1 - 2013/9/10
N2 - In this work, we analyze the mass distribution of MACSJ1206.2-0847, particularly focusing on the halo properties of its cluster members. The cluster appears relaxed in its X-ray emission, but has a significant amount of intracluster light that is not centrally concentrated, suggesting that galaxy-scale interactions are still ongoing despite the overall relaxed state. The cluster lenses 12 background galaxies into multiple images and one galaxy at z = 1.033 into a giant arc and its counterimage. The multiple image positions and the surface brightness (SFB) distribution of the arc, which is bent around several cluster members, are sensitive to the cluster galaxy halo properties. We model the cluster mass distribution with a Navarro-Frenk-White profile and the galaxy halos with two parameters for the mass normalization and the extent of a reference halo assuming scalings with their observed near-infrared light. We match the multiple image positions at an rms level of 0.″85 and can reconstruct the SFB distribution of the arc in several filters to a remarkable accuracy based on this cluster model. The length scale where the enclosed galaxy halo mass is best constrained is about 5 effective radii - a scale in between those accessible to dynamical and field strong-lensing mass estimates on the one hand and galaxy-galaxy weak-lensing results on the other hand. The velocity dispersion and halo size of a galaxy with m 160W, AB = 19.2 and M B, Vega = -20.7 are σ = 150 km s-1 and r ≈ 26 ± 6 kpc, respectively, indicating that the halos of the cluster galaxies are tidally stripped. We also reconstruct the unlensed source, which is smaller by a factor of ∼5.8 in area, demonstrating the increase in morphological information due to lensing. We conclude that this galaxy likely has star-forming spiral arms with a red (older) central component.
AB - In this work, we analyze the mass distribution of MACSJ1206.2-0847, particularly focusing on the halo properties of its cluster members. The cluster appears relaxed in its X-ray emission, but has a significant amount of intracluster light that is not centrally concentrated, suggesting that galaxy-scale interactions are still ongoing despite the overall relaxed state. The cluster lenses 12 background galaxies into multiple images and one galaxy at z = 1.033 into a giant arc and its counterimage. The multiple image positions and the surface brightness (SFB) distribution of the arc, which is bent around several cluster members, are sensitive to the cluster galaxy halo properties. We model the cluster mass distribution with a Navarro-Frenk-White profile and the galaxy halos with two parameters for the mass normalization and the extent of a reference halo assuming scalings with their observed near-infrared light. We match the multiple image positions at an rms level of 0.″85 and can reconstruct the SFB distribution of the arc in several filters to a remarkable accuracy based on this cluster model. The length scale where the enclosed galaxy halo mass is best constrained is about 5 effective radii - a scale in between those accessible to dynamical and field strong-lensing mass estimates on the one hand and galaxy-galaxy weak-lensing results on the other hand. The velocity dispersion and halo size of a galaxy with m 160W, AB = 19.2 and M B, Vega = -20.7 are σ = 150 km s-1 and r ≈ 26 ± 6 kpc, respectively, indicating that the halos of the cluster galaxies are tidally stripped. We also reconstruct the unlensed source, which is smaller by a factor of ∼5.8 in area, demonstrating the increase in morphological information due to lensing. We conclude that this galaxy likely has star-forming spiral arms with a red (older) central component.
KW - galaxies: clusters: individual (MACSJ1206.2-0847)
KW - galaxies: elliptical and lenticular, cD
KW - galaxies: halos
KW - galaxies: interactions
KW - gravitational lensing: strong
UR - http://www.scopus.com/inward/record.url?scp=84883609800&partnerID=8YFLogxK
U2 - 10.1088/0004-637X/774/2/124
DO - 10.1088/0004-637X/774/2/124
M3 - Article
AN - SCOPUS:84883609800
SN - 0004-637X
VL - 774
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 124
ER -