Search Publications
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…
The SWAP EUV Imaging Telescope. Part II: In-flight Performance and Calibration
Mierla, M.; Berghmans, D.; Seaton, D. B. +6 more
The Sun Watcher with Active Pixel System detector and Image Processing (SWAP) telescope was launched on 2 November 2009 onboard the ESA PROBA2 technological mission and has acquired images of the solar corona every one to two minutes for more than two years. The most important technological developments included in SWAP are a radiation-resistant C…
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…
A Tentative Detection of an Emission Line at 1.6 µm for the z ~ 12 Candidate UDFj-39546284
van Dokkum, Pieter G.; Franx, Marijn; Illingworth, Garth D. +5 more
We present deep WFC3 grism observations of the candidate z ~ 12 galaxy UDFj-39546284 in the Hubble Space Telescope (HST) Ultra Deep Field (UDF), by combining spectroscopic data from the 3D-HST and CANDELS surveys. The total exposure time is 40.5 ks and the spectrum covers 1.10 < λ < 1.65 µm. We search for faint emission lines by cross-…
Hubble Space Telescope ACS Imaging of the GOALS Sample: Quantitative Structural Properties of Nearby Luminous Infrared Galaxies with L IR > 1011.4 L ⊙
Sanders, D. B.; Kim, D. -C.; Surace, J. A. +11 more
A Hubble Space Telescope/Advanced Camera for Surveys study of the structural properties of 85 luminous and ultraluminous (L IR > 1011.4 L ⊙) infrared galaxies (LIRGs and ULIRGs) in the Great Observatories All-sky LIRG Survey (GOALS) sample is presented. Two-dimensional GALFIT analysis has been performed on F814W…
Active Galactic Nucleus Feedback at z ~ 2 and the Mutual Evolution of Active and Inactive Galaxies
Cimatti, A.; Daddi, E.; Rodighiero, G. +7 more
The relationship between galaxies of intermediate stellar mass and moderate luminosity active galactic nuclei (AGNs) at 1 < z < 3 is investigated with a Galaxy Mass Assembly ultra-deep Spectroscopic Survey (GMASS) sample complemented with public data in the GOODS-South field. Using X-ray data, hidden AGNs are identified in unsuspected star-f…
The Nature of Filamentary Cold Gas in the Core of the Virgo Cluster
Simionescu, A.; von der Linden, A.; Fabian, A. C. +10 more
We present a multi-wavelength study of the emission-line nebulae located ~38'' (3 kpc in projection) southeast of the nucleus of M87, the central dominant galaxy of the Virgo Cluster. We report the detection of far-infrared (FIR) [C II] line emission at 158 µm from the nebulae using observations made with the Herschel Photodetector Array Cam…
Nuclear astrophysics lessons from INTEGRAL
Diehl, Roland
Measurements of high-energy photons from cosmic sources of nuclear radiation through ESA's INTEGRAL mission have advanced our knowledge: new data with high spectral resolution showed that characteristic gamma-ray lines from radioactive decays occur throughout the Galaxy in its interstellar medium. Although the number of detected sources and often …
Stratospheric aerosols on Jupiter from Cassini observations
Zhang, X.; West, R. A.; Banfield, D. +1 more
We retrieved global distributions and optical properties of stratospheric aerosols on Jupiter from ground-based NIR spectra and multiple-phase-angle images from Cassini Imaging Science Subsystem (ISS). A high-latitude haze layer is located at ∼10-20 mbar, higher than in the middle and low latitudes (∼50 mbar). Compact sub-micron particles are main…
Dark energy constraints after the new Planck data
Zhang, Xinmin; Xia, Jun-Qing; Li, Hong
The Planck Collaboration has recently published maps of the cosmic microwave background radiation with the highest precision. In the standard flat Λ cold dark matter framework, Planck data show that the Hubble constant H0 is in tension with that measured by the several direct probes on H0. In this paper, we perform a global a…