Marijn Franx

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We report on the detection of weak gravitational lensing of faint, distant background objects by Cl 1358+62, a rich cluster of galaxies at a redshift of z=0.33. The observations consist of a large, multi-color mosaic of HST WFPC2 images. The number density of approximately 50 background objects arcmin−2 allows us to do a detailed weak lensing analysis of(More)
We have analyzed the shape of the Fundamental Plane (FP) for a sample of 226 E and S0 galaxies in ten clusters of galaxies. We nd that the distribution of galaxies is well approximated by a plane of the form log r e = 1:24 log 0:82log<I> e + for photometry obtained in Gunn r. This result is in good agreement with previous determinations. The FP has a(More)
We observed the Hubble Deep Field South with the new panoramic integral field spectrograph MUSE that we built and just commissioned at the VLT. The data cube resulting from 27 hours of integration covers one arcmin2 field of view at an unprecedented depth with a 1 emission line surface brightness limit of 1 ⇥ 10–19erg s–1cm–2 arcsec–2, and contains ⇠90,000(More)
We present results from a morphological study of the distant X-ray cluster MS 1054–03 at z = 0.83. We have obtained a large, two color HST WFPC2 mosaic of this cluster, and measured redshifts of 186 galaxies in the MS 1054–03 field with the 10m Keck telescope. Of 81 spectroscopically confirmed cluster galaxies observerd with HST, 13 are merger systems. Most(More)
Multicolor coronagraphic images of the circumstellar disk around HD 141569A have been obtained with the Hubble Space Telescope Advanced Camera for Surveys. The B, V, and I images show that the disk’s previously described multiple-ring structure is actually a continuous distribution of dust with a tightly wound spiral structure. Extending from the disk are(More)
We present the evolution of the rest-frame optical luminosity density, j λ , of the integrated restframe optical color, and of the stellar mass density, ρ∗, for a sample of Ks-band selected galaxies in the HDF-S. We derived j λ in the rest-frame U , B, and V -bands for galaxies with lV> 1.4 × 10 10 h 70 L⊙. For a complete sample of Ks selected galaxies in(More)
We have measured the weak gravitational lensing of faint, distant background galaxies by MS 1054-03, a rich and X-ray luminous cluster of galaxies at a redshift of z = 0.83, using a two-colour mosaic of deep WFPC2 images. The small corrections for the size of the PSF and the high number density of background galaxies obtained in these observations result in(More)
We present 3D-HST, a near-infrared spectroscopic Treasury program with the Hubble Space Telescope for studying the physical processes that shape galaxies in the distant universe. 3D-HST provides rest-frame optical spectra for a sample of ∼7000 galaxies at 1 < z < 3.5, the epoch when ∼60% of all star formation took place, the number density of quasars(More)
We present the evolution of the luminosity–size and stellar mass–size relations of luminous (LV &3.4×10 h70 L⊙) and of massive (M⋆&3×10 h70 M⊙) galaxies in the last ∼11 Gyr. We use very deep near–infrared images of the Hubble Deep Field–South and the MS1054-03 field in the Js, H and Ks bands from FIRES to retrieve the sizes in the optical rest–frame for(More)
We present HSTACS observations of the most distant radio galaxy known, TN J0924 2201 at z 1⁄4 5:2. This radio galaxy has six spectroscopically confirmed Ly -emitting companion galaxies and appears to lie within an overdense region. The radio galaxy ismarginally resolved in i775 and z850, showing continuum emission alignedwith the radio axis, similar to what(More)