Search Publications
Lyman-break galaxies at z ~ 5 - I. First significant stellar mass assembly in galaxies that are not simply z ~ 3 LBGs at higher redshift
Lehnert, Matthew D.; Förster Schreiber, Natascha M.; Bremer, Malcolm N. +2 more
We determine the ensemble properties of z ~ 5 Lyman-break galaxies (LBGs) selected as V-band dropouts to iAB < 26.3 in the Chandra Deep Field-South using their rest-frame UV-to-visible spectral energy distributions. By matching the selection and performing the same analysis that has been used for z ~ 3 samples, we show clear differen…
Galactic Bulges from Hubble Space Telescope NICMOS Observations: Central Galaxian Objects, and Nuclear Profile Slopes
Balcells, Marc; Graham, Alister W.; Peletier, Reynier F.
We have measured the central structural properties for a sample of S0-Sbc galaxies down to scales of ~10 pc using Hubble Space Telescope NICMOS images. Central star clusters are found in 58% of our sample. Their near-infrared luminosities scale with the host bulge luminosities, as reported in 2003 by Balcells and coworkers. In terms of photometric…
AEGIS: Host Galaxy Morphologies of X-Ray-selected and Infrared-selected Active Galactic Nuclei at 0.2 <= z < 1.2
Barmby, P.; Cooper, M. C.; Lin, L. +16 more
We visually and quantitatively determine the host galaxy morphologies of 94 intermediate-redshift (0.2<=z<1.2) active galactic nuclei (AGNs), selected using Chandra X-ray data and Spitzer mid-infrared data in the Extended Groth Strip. Using recently developed morphology measures, the second-order moment of the brightest 20% of a galaxy's flu…
A multi-wavelength study of z = 3.15 Lyman-α emitters in the GOODS South Field
Watson, D.; Fynbo, J. P. U.; Rosati, P. +7 more
Context: Lyα-emitters have proven to be excellent probes of faint, star-forming galaxies in the high redshift universe. However, although the sample of known emitters is increasingly growing, their nature (e.g. stellar masses, ages, metallicities, star-formation rates) is still poorly constrained.
Aims: We aim to study the nature of Lyα-emitte…
The Cosmic Evolution Survey (COSMOS): The Morphological Content and Environmental Dependence of the Galaxy Color-Magnitude Relation at z ~ 0.7
Taniguchi, Y.; Franceschini, A.; Capak, P. +11 more
We study the environmental dependence and the morphological composition of the galaxy color-magnitude diagram at z~0.7, using a pilot subsample of COSMOS. The sample includes ~2000 galaxies with IAB<24 and photometric redshift within 0.61<z<0.85, covering an area of 270 arcmin2. Galaxy morphologies are estimated via …
Enceladus' south polar sea
Collins, Geoffrey C.; Goodman, Jason C.
Recent observations of the south pole of Saturn's moon Enceladus by the Cassini spacecraft have revealed an active world, powered by internal heat. In this paper, we propose that localized subsurface melting on Enceladus has produced an internal south polar sea. Evidence for this localized sea comes from the shape of Enceladus, which does not matc…
Evidence for a Long-standing Top-heavy Initial Mass Function in the Central Parsec of the Galaxy
Genzel, R.; Martins, F.; Salaris, M. +10 more
We classify 329 late-type giants within 1 pc of Sgr A*, using the adaptive optics integral field spectrometer SINFONI on the VLT. These observations represent the deepest spectroscopic data set so far obtained for the Galactic center, reaching a 50% completeness threshold at the approximate magnitude of the helium-burning red clump (KS~…
The Role of Galaxy Interactions and Mergers in Star Formation at z<=1.3: Mid-Infrared Properties in the Spitzer First Look Survey
Helou, G.; Armus, L.; Appleton, P. N. +8 more
By combining the 0.12 deg2 F814W Hubble Space Telescope (HST) and Spitzer MIPS 24 µm imaging in the First Look Survey (FLS), we investigate the properties of interacting and merging mid-infrared bright and faint sources at 0.2<=z<=1.3. We find a marginally significant increase in the pair fraction for MIPS 24 µm detect…
First numerical ephemerides of the Martian moons
Pätzold, M.; Lainey, V.; Dehant, V.
We present new ephemerides of Phobos and Deimos that are fit to observations from 1877 to 2005 and include recent spacecraft observations by Mars Global Surveyor and Mars Express. In contrast to earlier models, this is the first completely numerical one. In particular, the tidal effects have been modeled by the tidal bulge raised by each moon on t…
The Low-Mass X-Ray Binary and Globular Cluster Connection in Virgo Cluster Early-Type Galaxies: Optical Properties
Sarazin, Craig L.; Jordán, Andrés; Côté, Patrick +6 more
LMXBs form efficiently in GCs. By combining Chandra and HST ACS observations of 11 massive early-type galaxies in the Virgo Cluster, we use the most accurate identification of LMXBs and GCs to date to explore the optical properties of 270 GCs with LMXBs and 6488 GCs without detectable X-ray emission. More massive, redder, and more compact GCs are …