Search Publications
Intrinsic galaxy shapes and alignments - I. Measuring and modelling COSMOS intrinsic galaxy ellipticities
Schrabback, T.; Hoekstra, H.; Schneider, P. +5 more
The statistical properties of the ellipticities of galaxy images depend on how galaxies form and evolve, and therefore constrain models of galaxy morphology, which are key to the removal of the intrinsic alignment contamination of cosmological weak lensing surveys, as well as to the calibration of weak lensing shape measurements. We construct such…
The ATLAS3D Project - XXIII. Angular momentum and nuclear surface brightness profiles
Krajnović, Davor; Emsellem, Eric; Sarzi, Marc +22 more
We investigate nuclear light profiles in 135 ATLAS3D galaxies for which the Hubble Space Telescope (HST) imaging is available and compare them to the large-scale kinematics obtained with the SAURON integral-field spectrograph. Specific angular momentum, λR, correlates with the shape of nuclear light profiles, where, as sugges…
Focusing on warm dark matter with lensed high-redshift galaxies.
Pacucci, F.; Mesinger, A.; Haiman, Z.
We propose a novel use of high-redshift galaxies, discovered in deep Hubble Space Telescope (HST) fields around strong lensing clusters. These fields probe small comoving volumes (∼103 Mpc3) at high magnification (µ ≳ 10) and can detect otherwise inaccessible ultra-faint galaxies. Even a few galaxies found in such small…
Rotation in NGC 2264: a study based on CoRoT photometric observations
Bouvier, J.; Micela, G.; Favata, F. +2 more
Rotation is one of the key stellar parameters which undergo substantial evolution during the stellar lifetime, in particular during the early stages. Stellar rotational periods can be determined on the basis of the periodic modulation of starlight produced by non-uniformities on the surface of the stars, due to manifestation of stellar activity. W…
The properties of (sub-)millimetre-selected galaxies as revealed by CANDELS HST WFC3/IR imaging in GOODS-South
Kartaltepe, J. S.; Ferguson, H. C.; McLure, R. J. +16 more
We have exploited the Hubble Space Telescope (HST) Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS) J and H-band Wide Field Camera 3 (WFC3)/infrared (IR) imaging to study the properties of (sub-)millimetre galaxies within the Great Observatories Origins Deep Survey South (GOODS-South) field. After using the deep radio (Very Large…
New image statistics for detecting disturbed galaxy morphologies at high redshift
Koekemoer, A. M.; Lotz, J. M.; Conselice, C. J. +5 more
Testing theories of hierarchical structure formation requires estimating the distribution of galaxy morphologies and its change with redshift. One aspect of this investigation involves identifying galaxies with disturbed morphologies (e.g. merging galaxies). This is often done by summarizing galaxy images using, e.g. the concentration, asymmetry a…
Flux calibration of broad-band far-infrared and submillimetre photometric instruments: theory and application to Herschel-SPIRE
Valtchanov, I.; Bock, J.; Conley, A. +15 more
Photometric instruments operating at far-infrared to millimetre wavelengths often have broad spectral passbands (λ/Δλ ∼ 3 or less), especially those operating in space. A broad passband can result in significant variation of the beam profile and aperture efficiency across the passband, effects which thus far have not generally been taken into acco…
The binary fractions in the massive young Large Magellanic Cloud star clusters NGC 1805 and NGC 1818
Deng, Licai; de Grijs, Richard; Li, Chengyuan
Using high-resolution data sets obtained with the Hubble Space Telescope, we investigate the radial distributions of the F-type main-sequence binary fractions in the massive young Large Magellanic Cloud star clusters NGC 1805 and NGC 1818. We apply both an isochrone-fitting approach and χ2 minimization using Monte Carlo simulations, for…
A blurred reflection interpretation for the intermediate flux state in Mrk 335
Fabian, A. C.; Komossa, S.; Miniutti, G. +7 more
As part of a long-term monitoring campaign of Mrk 335, deep XMM-Newton observations catch the narrow-line Seyfert 1 galaxy (NLS1) in a complex, intermediate flux interval as the active galaxy is transiting from low to high flux. Other works on these same data examined the general behaviour of the NLS1 and the conditions of its warm absorber. The a…
The insignificance of Major mergers in driving star formation at z =~ 2.
O'Connell, R. W.; Dekel, A.; Hathi, N. P. +7 more
We study the significance of major-merger-driven star formation in the early Universe, by quantifying the contribution of this process to the total star formation budget in 80 massive (M* > 1010 M⊙) galaxies at z ≃ 2. Employing visually classified morphologies from rest-frame V-band Hubble Space Telescope (HST) …