Reconstructing the extended structure of multiple sources strongly lensed by the ultra-massive elliptical galaxy SDSS J0100+1818
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Reconstructing the extended structure of multiple sources strongly lensed by the ultra-massive elliptical galaxy SDSS J0100+1818. / Bolamperti, A.; Grillo, C.; Canameras, R.; Suyu, S. H.; Christensen, L.
I: Astronomy & Astrophysics, Bind 671, A60, 06.03.2023.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Reconstructing the extended structure of multiple sources strongly lensed by the ultra-massive elliptical galaxy SDSS J0100+1818
AU - Bolamperti, A.
AU - Grillo, C.
AU - Canameras, R.
AU - Suyu, S. H.
AU - Christensen, L.
PY - 2023/3/6
Y1 - 2023/3/6
N2 - We study the total and baryonic mass distributions of the deflector SDSS J0100+1818 through a full strong lensing analysis. The system is composed of an ultra-massive early-type galaxy at z=0.581, with a total stellar mass of (1.5 +/- 0.3)x10(12)M(circle dot) and a stellar velocity dispersion of (450 +/- 40) km s(-1), surrounded by ten multiple images of three background sources, two of which are spectroscopically confirmed at z=1.880. We took advantage of high-resolution HST photometry and VLT/X-shooter spectroscopy to measure the positions of the multiple images and performed a strong lensing study with the software GLEE. We tested different total mass profiles for the lens and modeled the background sources first as point-like and then as extended objects. We successfully predict the positions of the observed multiple images and reconstruct over approximately 7200 HST pixels the complex surface brightness distributions of the sources. We measured the cumulative total mass profile of the lens and find a total mass value of (9.1 +/- 0.1)x10(12)M(circle dot), within the Einstein radius of approximately 42 kpc, and stellar-over-total mass fractions ranging from (49 +/- 12)%, at the half-light radius (R-e=9.3 kpc) of the lens galaxy, to (10 +/- 2)%, in the outer regions (R=70 kpc). These results suggest that the baryonic mass component of SDSS J0100+1818 is very concentrated in its core and that the lens early-type galaxy (or group) is immersed in a massive dark matter halo, which allows it to act as a powerful gravitational lens, creating multiple images with exceptional angular separations. This is consistent with what has been found in other ultra-high-mass candidates at intermediate redshift. We also measured the physical sizes of the distant sources, resolving them down to a few hundred parsecs. Finally, we quantify and discuss a relevant source of systematic uncertainties on the reconstructed sizes of background galaxies, associated with the adopted lens total mass model.
AB - We study the total and baryonic mass distributions of the deflector SDSS J0100+1818 through a full strong lensing analysis. The system is composed of an ultra-massive early-type galaxy at z=0.581, with a total stellar mass of (1.5 +/- 0.3)x10(12)M(circle dot) and a stellar velocity dispersion of (450 +/- 40) km s(-1), surrounded by ten multiple images of three background sources, two of which are spectroscopically confirmed at z=1.880. We took advantage of high-resolution HST photometry and VLT/X-shooter spectroscopy to measure the positions of the multiple images and performed a strong lensing study with the software GLEE. We tested different total mass profiles for the lens and modeled the background sources first as point-like and then as extended objects. We successfully predict the positions of the observed multiple images and reconstruct over approximately 7200 HST pixels the complex surface brightness distributions of the sources. We measured the cumulative total mass profile of the lens and find a total mass value of (9.1 +/- 0.1)x10(12)M(circle dot), within the Einstein radius of approximately 42 kpc, and stellar-over-total mass fractions ranging from (49 +/- 12)%, at the half-light radius (R-e=9.3 kpc) of the lens galaxy, to (10 +/- 2)%, in the outer regions (R=70 kpc). These results suggest that the baryonic mass component of SDSS J0100+1818 is very concentrated in its core and that the lens early-type galaxy (or group) is immersed in a massive dark matter halo, which allows it to act as a powerful gravitational lens, creating multiple images with exceptional angular separations. This is consistent with what has been found in other ultra-high-mass candidates at intermediate redshift. We also measured the physical sizes of the distant sources, resolving them down to a few hundred parsecs. Finally, we quantify and discuss a relevant source of systematic uncertainties on the reconstructed sizes of background galaxies, associated with the adopted lens total mass model.
KW - gravitational lensing
KW - strong
KW - galaxies
KW - evolution
KW - dark matter
KW - DARK-MATTER HALOS
KW - STAR-FORMING CLUMPS
KW - SOURCE-PLANE LENS
KW - COSMOLOGICAL CONSTRAINTS
KW - GRAVITATIONAL LENSES
KW - PHYSICAL-PROPERTIES
KW - DENSITY PROFILES
KW - GALACTIC HALOS
KW - STELLAR MASSES
KW - GIANT CLUMPS
U2 - 10.1051/0004-6361/202244680
DO - 10.1051/0004-6361/202244680
M3 - Journal article
VL - 671
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
SN - 0004-6361
M1 - A60
ER -
ID: 342497025