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The XXL Survey. II. The bright cluster sample: catalogue and luminosity function
Smith, G. P.; Chiappetti, L.; Altieri, B. +40 more
Context. The XXL Survey is the largest survey carried out by the XMM-Newton satellite and covers a total area of 50 square degrees distributed over two fields. It primarily aims at investigating the large-scale structures of the Universe using the distribution of galaxy clusters and active galactic nuclei as tracers of the matter distribution. The…
Exposed water ice on the nucleus of comet 67P/Churyumov-Gerasimenko
Langevin, Y.; Bellucci, G.; Jaumann, R. +77 more
Although water vapour is the main species observed in the coma of comet 67P/Churyumov-Gerasimenko and water is the major constituent of cometary nuclei, limited evidence for exposed water-ice regions on the surface of the nucleus has been found so far. The absence of large regions of exposed water ice seems a common finding on the surfaces of many…
L‧CO/LFIR Relations with CO Rotational Ladders of Galaxies Across the Herschel SPIRE Archive
Conley, A.; Glenn, J.; Kamenetzky, J. +2 more
We present a catalog of all CO (J = 4-3 through J = 13-12), [C I], and [N II] lines available from extragalactic spectra from the Herschel SPIRE Fourier Transform Spectrometer (FTS) archive combined with observations of the low-J CO lines from the literature and from the Arizona Radio Observatory. This work examines the relationships between L
The central parsecs of M87: jet emission and an elusive accretion disc
Espada, D.; Prieto, M. A.; González-Martín, O. +2 more
We present the first simultaneous spectral energy distribution (SED) of M87 core at a scale of 0.4 arcsec ( ∼ 32 pc) across the electromagnetic spectrum. Two separate, quiescent, and active states are sampled that are characterized by a similar featureless SED of power-law form, and that are thus remarkably different from that of a canonical activ…
Emerging trends and a comet taxonomy based on the volatile chemistry measured in thirty comets with high-resolution infrared spectroscopy between 1997 and 2013
Weaver, Harold A.; Vervack, Ronald J.; Kawakita, Hideyo +1 more
A systematic analysis of the mixing ratios with respect to H2O for eight species (CH3OH, HCN, NH3, H2CO, C2H2, C2H6, CH4, and CO) measured with high-resolution infrared spectroscopy in thirty comets between 1997 and 2013 is presented. Some trends are…
ISM Excitation and Metallicity of Star-forming Galaxies at z ≃ 3.3 from Near-IR Spectroscopy
Daddi, E.; Capak, P.; Carollo, C. M. +8 more
We study the relationship between stellar mass, star formation rate (SFR), ionization state, and gas-phase metallicity for a sample of 41 normal star-forming galaxies at 3 ≲ z ≲ 3.7. The gas-phase oxygen abundance, ionization parameter, and electron density of ionized gas are derived from rest-frame optical strong emission lines measured on near-i…
Morphologies of ~190,000 Galaxies at z = 0-10 Revealed with HST Legacy Data. II. Evolution of Clumpy Galaxies
Ouchi, Masami; Harikane, Yuichi; Shibuya, Takatoshi +1 more
We investigate the evolution of clumpy galaxies with Hubble Space Telescope (HST) samples of ∼17,000 photo-z and Lyman break galaxies at z ≃ 0-8. We detect clumpy galaxies with off-center clumps in a self-consistent algorithm that is well tested with previous study results, and we measure the number fraction of clumpy galaxies at the rest-frame UV…
Coalescence of magnetic flux ropes in the ion diffusion region of magnetic reconnection
Wang, Shui; Huang, Can; Guo, Fan +7 more
Merging magnetic flux ropes, which are believed to play an important role in magnetic reconnection, have now been clearly identified. Observations show that coalescence is indeed closely related to reconnection dynamics and also to turbulence.
Measurements of Extragalactic Background Light from the Far UV to the Far IR from Deep Ground- and Space-based Galaxy Counts
Cohen, Seth; Driver, Simon P.; Robotham, Aaron S. G. +7 more
We combine wide and deep galaxy number-count data from the Galaxy And Mass Assembly, COSMOS/G10, Hubble Space Telescope (HST) Early Release Science, HST UVUDF, and various near-, mid-, and far-IR data sets from ESO, Spitzer, and Herschel. The combined data range from the far UV (0.15 µm) to far-IR (500 µm), and in all cases the contrib…
How Isotropic is the Universe?
Peiris, Hiranya V.; Feeney, Stephen M.; Pontzen, Andrew +2 more
A fundamental assumption in the standard model of cosmology is that the Universe is isotropic on large scales. Breaking this assumption leads to a set of solutions to Einstein's field equations, known as Bianchi cosmologies, only a subset of which have ever been tested against data. For the first time, we consider all degrees of freedom in these s…