TDCOSMO 2025: Cosmological constraints from strong lensing time delays

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Volume 704 (December 2025)

A&A, 704 (2025) A63

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Table 2.

Unresolved stellar velocity dispersion measurements based on JWST-NIRSpec and VLT-MUSE spectra.

Lens	Instrument	Aperture	σ_los [km s⁻¹]	FWHM [″]
DES J0408−5354	MUSE	1 $\overset{″}{.}$ $\overset{\prime \prime }{.}$ 0 diameter	242 ± 10 ± 7	0.52
HE 0435−1223	NIRSpec	0 $\overset{″}{.}$ $\overset{\prime \prime }{.}$ 55 × 0 $\overset{″}{.}$ $\overset{\prime \prime }{.}$ 55	227 ± 6 ± 2	0.15
PG 1115+080	NIRSpec	0 $\overset{″}{.}$ $\overset{\prime \prime }{.}$ 55 × 0 $\overset{″}{.}$ $\overset{\prime \prime }{.}$ 55	236 ± 7 ± 1	0.15
SDSS J1206+4332	NIRSpec	0 $\overset{″}{.}$ $\overset{\prime \prime }{.}$ 55 × 0 $\overset{″}{.}$ $\overset{\prime \prime }{.}$ 55	291 ± 9 ± 4	0.15
B1608+656	NIRSpec	0 $\overset{″}{.}$ $\overset{\prime \prime }{.}$ 55 × 0 $\overset{″}{.}$ $\overset{\prime \prime }{.}$ 55	306 ± 9 ± 7	0.15
WFI 2033−4723	NIRSpec	0 $\overset{″}{.}$ $\overset{\prime \prime }{.}$ 55 × 0 $\overset{″}{.}$ $\overset{\prime \prime }{.}$ 55	211 ± 11 ± 2	0.15
WGD 2038−4008	MUSE	1 $\overset{″}{.}$ $\overset{\prime \prime }{.}$ 5 diameter	255 ± 16 ± 2	1.26

Notes. The aperture column lists the sizes of the square extraction aperture for the NIRSpec and the diameters of the circular aperture for the MUSE. The σ_los column reports the best-fit value, followed by the random and systematic uncertainty. The reported PSF FWHMs correspond to the observed wavelength of the Ca H&K lines for MUSE and of the CaT lines for NIRSpec.

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