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A new sample of X-ray selected narrow emission-line galaxies. I. The nature of optically elusive AGN
Watson, M. G.; Pons, E.
Using the 3XMM catalogue of serendipitous X-ray sources, and the SDSS-DR9 spectroscopic catalogue, we have obtained a new sample of X-ray selected narrow emission line galaxies. The standard optical diagnostic diagram and selection by hard X-ray luminosity expose a mismatch between the optically-based and X-ray-based classifications. The nature of…
Multiwavelength campaign on Mrk 509. XIII. Testing ionized-reflection models on Mrk 509
Kaastra, J. S.; Kriss, G. A.; Arav, N. +12 more
Active galactic nuclei (AGN) are the most luminous persistent objects in the universe. The X-ray domain is particularly important because the X-ray flux represents a significant fraction of the bolometric emission from such objects and probes the innermost regions of accretion disks, where most of this power is generated. An excess of X-ray emissi…
The Properties of Hα Emission-line Galaxies at Z = 2.24
Kong, Xu; Zheng, Xian Zhong; Gu, Qiu-Sheng +9 more
Using deep narrowband H 2 S1 and K s-band imaging data obtained with CFHT/WIRCam, we identify a sample of 56 Hα emission-line galaxies (ELGs) at z = 2.24 with the 5σ depths of H 2 S1 = 22.8 and K s = 24.8 (AB) over a 383 arcmin2 area in the Extended Chandra Deep Field South. A detailed analysi…
Soft X-ray characterisation of the long-term properties of supergiant fast X-ray transients
Esposito, P.; Ducci, L.; Romano, P. +3 more
Context. Supergiant fast X-ray transients (SFXTs) are high mass X-ray binaries (HMXBs) that are characterised by a hard X-ray (≥ 15 keV) flaring behaviour. These flares reach peak luminosities of 1036-1037 erg s-1 and last a few hours in the hard X-rays.
Aims: We investigate the long-term properties of SFXTs b…
A comparative study of infrared asteroid surveys: IRAS, AKARI, and WISE
Hasegawa, Sunao; Usui, Fumihiko; Ootsubo, Takafumi +2 more
We present a comparative study of three infrared asteroid surveys based on the size and albedo data from the Infrared Astronomical Satellite (IRAS), the Japanese infrared satellite AKARI, and the Wide-field Infrared Survey Explorer (WISE). Our study showed that: (i) the total number of asteroids detected with diameter and albedo information with t…
The Gaia Inertial Reference Frame and the Tilting of the Milky Way Disk
Spergel, David N.; Lindegren, Lennart; Perryman, Michael
While the precise relationship between the Milky Way disk and the symmetry planes of the dark matter halo remains somewhat uncertain, a time-varying disk orientation with respect to an inertial reference frame seems probable. Hierarchical structure formation models predict that the dark matter halo is triaxial and tumbles with a characteristic rat…
Cosmological evidence for leptonic asymmetry after Planck
Popa, L. A.; Caramete, A.
Recently, the PLANCK satellite found a larger and most precise value of the matter energy density, that impacts on the present values of other cosmological parameters such as the Hubble constant H0, the present cluster abundances S8, and the age of the Universe tU. The existing tension between PLANCK determination …
The bow shock, cold fronts and disintegrating cool core in the merging galaxy group RX J0751.3+5012
Fabian, A. C.; McNamara, B. R.; Russell, H. R. +6 more
We present a new Chandra X-ray observation of the off-axis galaxy group merger RX J0751.3+5012. The hot atmospheres of the two colliding groups appear highly distorted by the merger. The images reveal arc-like cold fronts around each group core, produced by the motion through the ambient medium, and the first detection of a group merger shock fron…
Tracing the Mass Growth and Star Formation Rate Evolution of Massive Galaxies from z ~ 6 to z ~ 1 in the Hubble Ultra-Deep Field
Stiavelli, Massimo; Franx, Marijn; van Dokkum, Pieter +8 more
We present an analysis of an H 160-selected photometric catalog of galaxies in the Hubble Ultra-Deep Field, using imaging from the WFC3/IR camera on the Hubble Space Telescope in combination with archival ultraviolet, optical, and near-infrared imaging. Using these data, we measure the spectral energy distributions of ~1500 galaxies to …
ULASJ1234+0907: the reddest type 1 quasar at z = 2.5 revealed in the X-ray and far-infrared.
Fabian, A. C.; Banerji, M.; McMahon, R. G.
We present Herschel and XMM-Newton observations of ULASJ1234+0907 (z = 2.503), the reddest broad-line type 1 quasar currently known with (i - K)AB > 7.1. Herschel observations indicate that the quasar host is a hyperluminous infrared galaxy with a total infrared luminosity of log10(LIR/L⊙) = 13.90 ± 0…