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The behaviour of dark matter associated with four bright cluster galaxies in the 10 kpc core of Abell 3827
Richard, Johan; Hilton, Matt; Massey, Richard +20 more
Galaxy cluster Abell 3827 hosts the stellar remnants of four almost equally bright elliptical galaxies within a core of radius 10 kpc. Such corrugation of the stellar distribution is very rare, and suggests recent formation by several simultaneous mergers. We map the distribution of associated dark matter, using new Hubble Space Telescope imaging …
The Herschel Comprehensive (U)LIRG Emission Survey (HERCULES): CO Ladders, Fine Structure Lines, and Neutral Gas Cooling
Veilleux, S.; Sanders, D. B.; Isaak, K. G. +27 more
(Ultra) luminous infrared galaxies ((U)LIRGs) are objects characterized by their extreme infrared (8-1000 µm) luminosities (L LIRG > 1011 L ⊙ and L ULIRG > 1012 L ⊙). The Herschel Comprehensive ULIRG Emission Survey (PI: van der Werf) presents a representative flux-limit…
The far-infrared/radio correlation and radio spectral index of galaxies in the SFR-M∗ plane up to z~2
Berta, S.; Magnelli, B.; Nordon, R. +21 more
We study the evolution of the radio spectral index and far-infrared/radio correlation (FRC) across the star-formation rate - stellar masse (i.e. SFR-M∗) plane up to z ~ 2. We start from a stellar-mass-selected sample of galaxies with reliable SFR and redshift estimates. We then grid the SFR-M∗ plane in several redshift ranges…
A new catalogue of Strömgren-Crawford uvbyβ photometry
Paunzen, E.
Context. The uvbyβ photometric system is widely used for the study of various Galactic and extragalactic objects. It measures the colour due to temperature differences, the Balmer discontinuity, and blanketing absorption due to metals.
Aims: A new all-sky catalogue of all available uvbyβ measurements from the literature was generated.
Me…
Regional surface morphology of comet 67P/Churyumov-Gerasimenko from Rosetta/OSIRIS images
Jorda, L.; Lamy, P. L.; Lara, L. M. +51 more
Aims: The OSIRIS camera onboard the Rosetta spacecraft has been acquiring images of the comet 67P/Churyumov-Gerasimenko (67P)'s nucleus at spatial resolutions down to ~0.17 m/px ever since Aug. 2014. These images have yielded unprecedented insight into the morphological diversity of the comet's surface. This paper presents an overview of the …
Relativistic boost as the cause of periodicity in a massive black-hole binary candidate
Haiman, Zoltán; Schiminovich, David; D'Orazio, Daniel J.
Because most large galaxies contain a central black hole, and galaxies often merge, black-hole binaries are expected to be common in galactic nuclei. Although they cannot be imaged, periodicities in the light curves of quasars have been interpreted as evidence for binaries, most recently in PG 1302-102, which has a short rest-frame optical period …
Warm-hot baryons comprise 5-10 per cent of filaments in the cosmic web
Richard, Johan; Massey, Richard; Kneib, Jean-Paul +8 more
Observations of the cosmic microwave background indicate that baryons account for 5 per cent of the Universe’s total energy content. In the local Universe, the census of all observed baryons falls short of this estimate by a factor of two. Cosmological simulations indicate that the missing baryons have not condensed into virialized haloes, but res…
NuSTAR Spectroscopy of Multi-component X-Ray Reflection from NGC 1068
Hailey, Charles J.; Brandt, William N.; Comastri, Andrea +26 more
We report on high-energy X-ray observations of the Compton-thick Seyfert 2 galaxy NGC 1068 with NuSTAR, which provide the best constraints to date on its >10 keV spectral shape. The NuSTAR data are consistent with those from past and current instruments to within cross-calibration uncertainties, and we find no strong continuum or line variabili…
X-shooter reveals powerful outflows in z ∼ 1.5 X-ray selected obscured quasi-stellar objects
Lutz, D.; Maiolino, R.; Salvato, M. +20 more
We present X-shooter at Very Large Telescope observations of a sample of 10 luminous, X-ray obscured quasi-stellar objects (QSOs) at z ∼ 1.5 from the XMM-COSMOS survey, expected to be caught in the transitioning phase from starburst to active galactic nucleus (AGN)-dominated systems. The main selection criterion is X-ray detection at bright fluxes…
Gaia FGK benchmark stars: abundances of α and iron-peak elements
Gilmore, G.; Montes, D.; Recio-Blanco, A. +26 more
Context. In the current era of large spectroscopic surveys of the Milky Way, reference stars for calibrating astrophysical parameters and chemical abundances are of paramount importance.
Aims: We determine elemental abundances of Mg, Si, Ca, Sc, Ti, V, Cr, Mn, Co, and Ni for our predefined set of Gaia FGK benchmark stars.
Methods: By ana…