A strong lensing model of the galaxy cluster PSZ1 G311.65-18.48
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Standard
A strong lensing model of the galaxy cluster PSZ1 G311.65-18.48. / Pignataro, G. V.; Bergamini, P.; Meneghetti, M.; Vanzella, E.; Calura, F.; Grillo, C.; Rosati, P.; Angora, G.; Brammer, G.; Caminha, G. B.; Mercurio, A.; Nonino, M.; Tozzi, P.
I: Astronomy & Astrophysics, Bind 655, A81, 24.11.2021.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - A strong lensing model of the galaxy cluster PSZ1 G311.65-18.48
AU - Pignataro, G. V.
AU - Bergamini, P.
AU - Meneghetti, M.
AU - Vanzella, E.
AU - Calura, F.
AU - Grillo, C.
AU - Rosati, P.
AU - Angora, G.
AU - Brammer, G.
AU - Caminha, G. B.
AU - Mercurio, A.
AU - Nonino, M.
AU - Tozzi, P.
PY - 2021/11/24
Y1 - 2021/11/24
N2 - We present a strong lensing analysis of the galaxy cluster PSZ1 G311.65-18.48 (z = 0.443) using multi-band observations with Hubble Space Telescope complemented with VLT /MUSE spectroscopic data. The MUSE observations provide redshift estimates for the lensed sources and help to reduce misidentification of the multiple images. Spectroscopic data are also used to measure the inner velocity dispersions of 15 cluster galaxies and calibrate the scaling relations to model the subhalo cluster component. The model is based on 62 multiple images grouped in 17 families belonging to four different sources. The majority of them are multiple images of compact stellar knots belonging to a single star-forming galaxy at z = 2.3702. This source is strongly lensed by the cluster to form the Sunburst Arc system. To accurately reproduce all the multiple images, we built a parametric mass model, which includes both cluster-scale and galaxy-scale components. The resulting model has a rms separation between the model-predicted and the observed positions of the multiple images of only 0.1400. We conclude that PSZ1 G311.65-18.48 has a relatively round projected shape and a large Einstein radius (2900 for zs = 2.3702), which could indicate that the cluster is elongated along the line of sight. The Sunburst Arc source is located at the intersection of a complex network of caustics, which explains why parts of the arc are imaged with unprecedented multiplicity (up to 12 times).
AB - We present a strong lensing analysis of the galaxy cluster PSZ1 G311.65-18.48 (z = 0.443) using multi-band observations with Hubble Space Telescope complemented with VLT /MUSE spectroscopic data. The MUSE observations provide redshift estimates for the lensed sources and help to reduce misidentification of the multiple images. Spectroscopic data are also used to measure the inner velocity dispersions of 15 cluster galaxies and calibrate the scaling relations to model the subhalo cluster component. The model is based on 62 multiple images grouped in 17 families belonging to four different sources. The majority of them are multiple images of compact stellar knots belonging to a single star-forming galaxy at z = 2.3702. This source is strongly lensed by the cluster to form the Sunburst Arc system. To accurately reproduce all the multiple images, we built a parametric mass model, which includes both cluster-scale and galaxy-scale components. The resulting model has a rms separation between the model-predicted and the observed positions of the multiple images of only 0.1400. We conclude that PSZ1 G311.65-18.48 has a relatively round projected shape and a large Einstein radius (2900 for zs = 2.3702), which could indicate that the cluster is elongated along the line of sight. The Sunburst Arc source is located at the intersection of a complex network of caustics, which explains why parts of the arc are imaged with unprecedented multiplicity (up to 12 times).
KW - galaxies: clusters: general
KW - gravitational lensing: strong
KW - cosmology: observations
KW - dark matter
KW - galaxies: kinematics and dynamics
KW - STAR-FORMATION
KW - ARC
KW - SUBSTRUCTURE
KW - HALO
KW - SIMULATIONS
KW - RESOLUTION
KW - STELLAR
KW - Z=2.481
KW - LENSES
U2 - 10.1051/0004-6361/202141586
DO - 10.1051/0004-6361/202141586
M3 - Journal article
VL - 655
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
SN - 0004-6361
M1 - A81
ER -
ID: 286312227