TY - JOUR
T1 - JWST’s PEARLS
T2 - Dust Attenuation and Gravitational Lensing in the Backlit-galaxy System VV 191
AU - Keel, William C.
AU - Windhorst, Rogier A.
AU - Jansen, Rolf A.
AU - Cohen, Seth H.
AU - Summers, Jake
AU - Holwerda, Benne
AU - Bradford, Sarah T.
AU - Robertson, Clayton D.
AU - Ferrami, Giovanni
AU - Wyithe, Stuart
AU - Yan, Haojing
AU - Conselice, Christopher J.
AU - Driver, Simon P.
AU - Robotham, Aaron
AU - Grogin, Norman A.
AU - Willmer, Christopher N.A.
AU - Koekemoer, Anton M.
AU - Frye, Brenda L.
AU - Hathi, Nimish P.
AU - Ryan, Russell E.
AU - Pirzkal, Nor
AU - Marshall, Madeline A.
AU - Coe, Dan
AU - Diego, Jose M.
AU - Broadhurst, Thomas J.
AU - Rutkowski, Michael J.
AU - Wang, Lifan
AU - Willner, S. P.
AU - Petric, Andreea
AU - Cheng, Cheng
AU - Zitrin, Adi
N1 - Publisher Copyright:
© 2023. The Author(s). Published by the American Astronomical Society.
PY - 2023/4/1
Y1 - 2023/4/1
N2 - We derive the spatial and wavelength behavior of dust attenuation in the multiple-armed spiral galaxy VV 191b using backlighting by the superimposed elliptical system VV 191a in a pair with an exceptionally favorable geometry for this measurement. Imaging using the James Webb Space Telescope and Hubble Space Telescope spans the wavelength range 0.3-4.5 μm with high angular resolution, tracing the dust in detail from 0.6-1.5 μm. Distinct dust lanes continue well beyond the bright spiral arms, and trace a complex web, with a very sharp radial cutoff near 1.7 Petrosian radii. We present attenuation profiles and coverage statistics in each band at radii 14-21 kpc. We derive the attenuation law with wavelength; the data both within and between the dust lanes clearly favor a stronger reddening behavior (R = A V /E B−V ≈ 2.0 between 0.6 and 0.9 μm, approaching unity by 1.5 μm) than found for starbursts and star-forming regions of galaxies. Power-law extinction behavior ∝λ −β gives β = 2.1 from 0.6-0.9 μm. R decreases at increasing wavelengths (R ≈ 1.1 between 0.9 and 1.5 μm), while β steepens to 2.5. Mixing regions of different column density flattens the wavelength behavior, so these results suggest a different grain population than in our vicinity. The NIRCam images reveal a lens arc and counterimage from a background galaxy at z ≈ 1, spanning 90° azimuthally at 2.″8 from the foreground elliptical-galaxy nucleus, and an additional weakly lensed galaxy. The lens model and imaging data give a mass/light ratio M/L B = 7.6 in solar units within the Einstein radius 2.0 kpc.
AB - We derive the spatial and wavelength behavior of dust attenuation in the multiple-armed spiral galaxy VV 191b using backlighting by the superimposed elliptical system VV 191a in a pair with an exceptionally favorable geometry for this measurement. Imaging using the James Webb Space Telescope and Hubble Space Telescope spans the wavelength range 0.3-4.5 μm with high angular resolution, tracing the dust in detail from 0.6-1.5 μm. Distinct dust lanes continue well beyond the bright spiral arms, and trace a complex web, with a very sharp radial cutoff near 1.7 Petrosian radii. We present attenuation profiles and coverage statistics in each band at radii 14-21 kpc. We derive the attenuation law with wavelength; the data both within and between the dust lanes clearly favor a stronger reddening behavior (R = A V /E B−V ≈ 2.0 between 0.6 and 0.9 μm, approaching unity by 1.5 μm) than found for starbursts and star-forming regions of galaxies. Power-law extinction behavior ∝λ −β gives β = 2.1 from 0.6-0.9 μm. R decreases at increasing wavelengths (R ≈ 1.1 between 0.9 and 1.5 μm), while β steepens to 2.5. Mixing regions of different column density flattens the wavelength behavior, so these results suggest a different grain population than in our vicinity. The NIRCam images reveal a lens arc and counterimage from a background galaxy at z ≈ 1, spanning 90° azimuthally at 2.″8 from the foreground elliptical-galaxy nucleus, and an additional weakly lensed galaxy. The lens model and imaging data give a mass/light ratio M/L B = 7.6 in solar units within the Einstein radius 2.0 kpc.
UR - https://www.scopus.com/pages/publications/85150877862
U2 - 10.3847/1538-3881/acbdff
DO - 10.3847/1538-3881/acbdff
M3 - Article
AN - SCOPUS:85150877862
SN - 0004-6256
VL - 165
JO - Astronomical Journal
JF - Astronomical Journal
IS - 4
M1 - 166
ER -