Search Publications
SDSS-IV/SPIDERS: A catalogue of X-ray selected AGN properties. Spectral properties and black hole mass estimates for SPIDERS SDSS DR14 type 1 AGN
Salvato, M.; Schulze, A.; Nandra, K. +7 more
This work presents the catalogue of optical spectral properties for all X-ray selected SPIDERS active galactic nuclei (AGN) up to SDSS DR14. SPIDERS (SPectroscopic IDentification of eROSITA Sources) is an SDSS-IV programme that is currently conducting optical spectroscopy of the counterparts to the X-ray selected sources detected in the ROSAT all-…
The Most Massive galaxy Clusters (M2C) across cosmic time: link between radial total mass distribution and dynamical state
Arnaud, M.; Pratt, G. W.; Bartalucci, I. +2 more
We study the dynamical state and the integrated total mass profiles of 75 massive (M500 > 5 × 1014 M⊙) Sunyaev-Zeldovich(SZ)-selected clusters at 0.08 < z < 1.1. The sample is built from the Planck catalogue, with the addition of four SPT clusters at z > 0.9. Using XMM-Newton imaging observations, we ch…
Weak-lensing shear measurement with machine learning. Teaching artificial neural networks about feature noise
Schrabback, T.; Hildebrandt, H.; Courbin, F. +3 more
Cosmic shear, that is weak gravitational lensing by the large-scale matter structure of the Universe, is a primary cosmological probe for several present and upcoming surveys investigating dark matter and dark energy, such as Euclid or WFIRST. The probe requires an extremely accurate measurement of the shapes of millions of galaxies based on imagi…
Linking surface morphology, composition, and activity on the nucleus of 67P/Churyumov-Gerasimenko
Lamy, P. L.; Bertaux, J. -L.; Shi, X. +37 more
Aims: The Rosetta space probe accompanied comet 67P/Churyumov-Gerasimenko for more than two years, obtaining an unprecedented amount of unique data of the comet nucleus and inner coma. This has enabled us to study its activity almost continuously from 4 au inbound to 3.6 au outbound, including the perihelion passage at 1.24 au. This work focu…
Discovery of a nitrogen-enhanced mildly metal-poor binary system: Possible evidence for pollution from an extinct AGB star
Beers, Timothy C.; Placco, Vinicius M.; Robin, Annie C. +12 more
We report the serendipitous discovery of a nitrogen-rich, mildly metal-poor ([Fe/H] = -1.08) giant star in a single-lined spectroscopic binary system found in the SDSS-IV Apache Point Observatory Galactic Evolution Experiment (APOGEE-2) survey, Data Release 14 (DR14). Previous work has assumed that two percent of halo giants with unusual elemental…
New near-infrared JHKs light-curve templates for RR Lyrae variables
Minniti, D.; Walker, A. R.; Mateo, M. +35 more
We provide homogeneous optical (UBVRI) and near-infrared (NIR, JHK) time series photometry for 254 cluster (ω Cen, M 4) and field RR Lyrae (RRL) variables. We ended up with more than 551 000 measurements, of which only 9% are literature data. For 94 fundamental (RRab) and 51 first overtones (RRc) we provide a complete optical/NIR characterization …
VIS3COS. II. Nature and nurture in galaxy structure and morphology
van der Wel, Arjen; Sobral, David; Darvish, Behnam +7 more
We study the impact of local density and stellar mass on the structure and morphology of approximately 500 quiescent and star-forming galaxies from the VIMOS Spectroscopic Survey of a Superstructure in COSMOS (VIS3COS). We perform bulge-to-disc decomposition of the surface brightness profiles and find ∼41 ± 3% of > 1010 M<…
Mapping the stellar age of the Milky Way bulge with the VVV. II. Deep JKs catalog release based on PSF photometry
Minniti, D.; Rejkuba, M.; Zoccali, M. +6 more
Context. The bulge represents the best compromise between old and massive Galactic components, and as such its study is a valuable opportunity to understand how the bulk of the Milky Way formed and evolved. In addition, being the only bulge in which we can individually resolve stars in all evolutionary sequences, the properties of its stellar cont…
The chemical structure of the very young starless core L1521E
Nagy, Z.; Caselli, P.; Spezzano, S. +5 more
Context. L1521E is a dense starless core in Taurus that was found to have relatively low molecular depletion by earlier studies, thus suggesting a recent formation.
Aims: We aim to characterize the chemical structure of L1521E and compare it to the more evolved L1544 pre-stellar core.
Methods: We have obtained 2.5 × 2.5 arcminute maps to…
A deep X-ray view of the bare AGN Ark 120. V. Spin determination from disc-Comptonisation efficiency method
Stern, D.; Farrah, D.; Done, C. +13 more
Context. The spin of supermassive black holes (SMBH) in active galactic nuclei (AGN) can be determined from spectral signature(s) of relativistic reflection such as the X-ray iron Kα line profile, but this can be rather uncertain when the line of sight intersects the so-called warm absorber and/or other wind components as these distort the continu…