Search Publications
The XXL Survey. VII. A supercluster of galaxies at z = 0.43
Altieri, B.; Valtchanov, I.; Smolčić, V. +15 more
Context. The XXL Survey is the largest homogeneous and contiguous survey carried out with XMM-Newton. Covering an area of 50 deg2 distributed over two fields, it primarily investigates the large-scale structures of the Universe using the distribution of galaxy clusters and active galactic nuclei as tracers of the matter distribution.
Saturn's northern auroras as observed using the Hubble Space Telescope
Badman, S. V.; Nichols, J. D.; Clarke, J. T. +4 more
We discuss the features of Saturn's northern FUV auroras as observed during a program of Hubble Space Telescope observations which executed over 2011-2013 and culminated, along with Cassini observations, in a comprehensive multi-spectral observing campaign. Our 2011-2013 observations of the northern aurora are also compared with those from our 200…
Submillimeter array observations of NGC 2264-C: molecular outflows and driving sources
Lumsden, Stuart L.; Cunningham, Nichol; Cyganowski, Claudia J. +2 more
We present 1.3 mm Submillimeter Array (SMA) observations at ∼3 arcsec resolution towards the brightest section of the intermediate/massive star-forming cluster NGC 2264-C. The millimetre continuum emission reveals ten 1.3 mm continuum peaks, of which four are new detections. The observed frequency range includes the known molecular jet/outflow tra…
Mid-infrared imaging- and spectro-polarimetric subarcsecond observations of NGC 1068
Esquej, P.; Telesco, C. M.; Díaz-Santos, T. +10 more
We present subarcsecond 7.5-13 µm imaging- and spectro-polarimetric observations of NGC 1068 using CanariCam on the 10.4-m Gran Telescopio CANARIAS. At all wavelengths, we find: (1) A 90 × 60 pc extended polarized feature in the northern ionization cone, with a uniform ∼44° polarization angle. Its polarization arises from dust and gas emissi…
The Effect of Unresolved Binaries on Globular Cluster Proper-motion Dispersion Profiles
Anderson, J.; Schinnerer, E.; van der Marel, R. P. +5 more
High-precision kinematic studies of globular clusters (GCs) require an accurate knowledge of all possible sources of contamination. Among other sources, binary stars can introduce systematic biases in the kinematics. Using a set of Monte Carlo cluster simulations with different concentrations and binary fractions, we investigate the effect of unre…
Observations of high and low Fe charge states in individual solar wind streams with coronal-hole origin
Berger, Lars; Heidrich-Meisner, Verena; Wimmer-Schweingruber, Robert +2 more
Context. The solar wind originating from coronal holes is comparatively well-understood and is characterized by lower densities and average charge states compared to the so-called slow solar wind. Except for wave perturbations, the average properties of the coronal-hole solar wind are passably constant.
Aims: In this case study, we focus on o…
Deep GeMS/GSAOI near-infrared observations of N159W in the Large Magellanic Cloud
Zavagno, A.; Neichel, B.; Samal, M. R. +5 more
Aims: The formation and properties of star clusters at the edge of H II regions are poorly known, partly due to limitations in angular resolution and sensitivity, which become particularly critical when dealing with extragalactic clusters. In this paper we study the stellar content and star-formation processes in the young N159W region in the…
Comparative study of water ice exposures on cometary nuclei using multispectral imaging data
Jorda, L.; Lamy, P. L.; Lara, L. M. +48 more
Deep Impact, EPOXI and Rosetta missions visited comets 9P/Tempel 1, 103P/Hartley 2 and 67P/Churyumov-Gerasimenko, respectively. Each of these three missions was equipped with both multispectral imagers and infrared spectrometers. Bright blue features containing water ice were detected in each of these comet nuclei. We analysed multispectral proper…
Diffuse low-ionization gas in the galactic halo casts doubts on z ≃ 0.03 WHIM detections
Piro, L.; Elvis, M.; Nicastro, F. +4 more
In this Letter, we demonstrate that the two claims of z ≃ 0.03 O VII K α absorption lines from Warm Hot Intergalactic Medium (WHIM) along the lines of sight to the blazars H 2356-309 (Buote et al.; Fang et al.) and Mkn 501 (Ren, Fang & Buote) are likely misidentifications of the z = 0 O II K β line produced by a diffuse Low-Ionization Metal Me…
Dark sectors of the Universe: A Euclid survey approach
Tutusaus, Isaac; Lamine, Brahim; Blanchard, Alain +3 more
In this paper we study the consequences of relaxing the hypothesis of the pressureless nature of the dark matter component when determining constraints on dark energy. To this aim we consider simple generalized dark matter models with constant equation of state parameter. We find that present-day low-redshift probes (type-Ia supernovae and baryoni…