The first results of HST NICMOS observations of BL Lacertae objects are presented. Selected target, observed through the F160W filter, are from the HST "snapshot" survey of BL Lacs (Urry, Scarpa et al. 1999), span redshifts up to z=0.6. Observations provide reliable color information for the host galaxy, which in all cases is fully resolved. The
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Además ofrece acceso al repositorio de preprints del IAC: https://research.iac.es/preprints/l
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NICMOS Observations of BL Lacertae Objects.Scarpa, R. et al.121998
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NICMOS observations of the nucleus of Centaurus A
We have obtained HST WFPC2 and NICMOS observations in the nuclear region of the closest powerful active galaxy known, NGC 5128 (Centaurus A). Narrow band imaging in the Paalpha line shows an elongated structure around the nucleus which we interpret as a disk of ionized gas, with a 15 pc radius. The disk does not appear to be perpendicular to the
Marconi, A. et al.Fecha de publicación:
121997 -
NIR spectral trends of HED meteorites: Can we discriminate between the magmatic evolution, mechanical mixing and observation geometry effects?
The Howardite-Eucrite-Diogenite (HED) suite is a family of differentiated meteorites that provide a unique opportunity to study the differentiation of small bodies. The likely parent-body of this meteorite group, (4) Vesta is presently under study by the Dawn mission, scrutinizing its surface in the visible and NIR infrared range. Here, we discuss
Beck, P. et al.Fecha de publicación:
122011 -
Nitrogen Abundances in Damped Lyalpha Galaxies
Nitrogen lines of the N I lambda1134 and lambda1200 multiplets in the damped Lyalpha (DLA) galaxies at z_abs = 2.309, 2.827, and 3.025 toward the QSOs 0100+1300, 1425+6039, and 0347-3819, respectively, have been detected by means of high-resolution spectra (R ~ 2 x 10^4) obtained with 4 m class telescopes at ESO (La Silla, Chile) and the
Vladilo, Giovanni et al.Fecha de publicación:
121998 -
NLTE Analysis of High-Resolution H-band Spectra. I. Neutral Silicon
We investigated the reliability of our silicon atomic model and the influence of non-local thermodynamical equilibrium (NLTE) on the formation of neutral silicon (Si i) lines in the near-infrared (near-IR) H-band. We derived the differential Si abundances for 13 sample stars with high-resolution H-band spectra from the Apache Point Observatory
Zhang, J. et al.Fecha de publicación:
122016 -
No Evidence for a Dependence of the Mass-Size Relation of Early-type Galaxies on Environment in the Local Universe
The early-type galaxy (ETG) mass-size relation has largely been studied to understand how these galaxies assembled their mass. One key observational result of the last years is that massive galaxies increased their size by a factor of a few at fixed stellar mass from z ~ 2. Hierarchical models favor minor mergers as a plausible driver of this size
Huertas-Company, M. et al.Fecha de publicación:
122013