Search Publications
The spectral energy distributions, host galaxies and environments of variability-selected active galactic nuclei in GOODS-South
Koekemoer, Anton; Sarajedini, Vicki; Villforth, Carolin
Variability selection has been proposed as a powerful tool for identifying both low-luminosity active galactic nuclei (AGN) and those with unusual spectral energy distributions. However, a systematic study of sources selected in such a way has been lacking. In this paper, we present the multiwavelength properties of the variability-selected AGN in…
Characterization of the non-Gaussianity of radio and IR point sources at CMB frequencies
Aghanim, N.; Kunz, M.; Lacasa, F. +1 more
This study, using publicly available simulations, focuses on the characterization of the non-Gaussianity produced by radio point sources and by infrared (IR) sources in the frequency range of the cosmic microwave background from 30 to 350 GHz.
We propose a simple prescription to infer the angular bispectrum from the power spectrum of point so…Searching for massive outflows in Holmberg IX X-1 and NGC 1313 X-1: the iron K band
Fabian, A. C.; Miller, J. M.; Reis, R. C. +1 more
We have analysed all the good quality XMM-Newton data publicly available for the bright ultraluminous X-ray sources Holmberg IX X-1 and NGC 1313 X-1, with the aim of searching for discrete emission or absorption features in the Fe K band that could provide observational evidence for the massive outflows predicted if these sources are accreting at …
Narrow absorption features in the co-added XMM-Newton RGS spectra of isolated neutron stars
Haberl, F.; Neuhäuser, R.; de Vries, C. P. +2 more
We co-added the available XMM-Newton Reflection Grating Spectrometer (RGS) spectra for each of the isolated X-ray pulsars RX J0720.4-3125, RX J1308.6+2127 (RBS1223), RX J1605.3+3249 and RX J1856.4-3754 (four members of the 'Magnificent Seven') and the 'Three Musketeers' Geminga, PSR B0656+14 and PSR B1055-52. We confirm the detection of a narrow a…
A new automatic method to identify galaxy mergers - I. Description and application to the Space Telescope A901/902 Galaxy Evolution Survey
Bell, Eric F.; Wolf, Christian; Aragón-Salamanca, Alfonso +10 more
We present a new automatic method to identify galaxy mergers using the morphological information contained in the residual images of galaxies after the subtraction of a smooth Sérsic model. The removal of the bulk signal from the host galaxy light is done with the aim of detecting the much fainter and elusive minor mergers. The specific morphologi…
Spectrophotometric investigation of Phobos with the Rosetta OSIRIS-NAC camera and implications for its collisional capture
Sierks, H.; Pajola, M.; Barbieri, C. +11 more
The Martian satellite Phobos has been observed on 2007 February 24 and 25, during the pre- and post-Mars closest approach (CA) of the ESA Rosetta spacecraft Mars swing-by. The goal of the observations was the determination of the surface composition of different areas of Phobos, in order to obtain new clues regarding its nature and origin. Near-ul…
Shape and orientation of the gas distribution in A1689
Ettori, S.; Baldi, A.; Sereno, M.
Knowledge of intrinsic shape and orientation of galaxy clusters is crucial to understand their formation and evolution. We propose a novel model which uses Bayesian inference to determine the intrinsic form of the hot intracluster medium of galaxy clusters. The method exploits X-ray spectroscopic and photometric data plus measurements of the Sunya…
Complex particle acceleration processes in the hotspots of 3C 105 and 3C 445
Brunetti, G.; Prieto, M. A.; Massaro, F. +3 more
We investigate the nature of the broad-band emission associated with the low-power radio hotspots 3C 105 South and 3C 445 South. Both hotspot regions are resolved in multiple radio/optical components. High-sensitivity radio Very Large Array, near-infrared/optical Very Large Telescope and Hubble Space Telescope (HST) and X-ray Chandra data have bee…
A peculiar galaxy appears at redshift 11: properties of a moderate-redshift interloper
Hayes, Matthew; Schaerer, Daniel; Pelló, Roser +2 more
In 2011 Laporte et al. reported a very high redshift galaxy candidate: a lensed J-band dropout (A2667-J1). J1 has a photometric redshift of z= 9.6-12, the probability density function for which permits no low- or intermediate-z solution. We here report new spectroscopic observations of this galaxy with Very Large Telescope/X-Shooter, which show cl…
YSO jets in the Galactic plane from UWISH2 - I. MHO catalogue for Serpens and Aquila
Froebrich, D.; Ioannidis, G.
Jets and outflows from young stellar objects (YSOs) are important signposts of currently ongoing star formation. In order to study these objects, we are conducting an unbiased survey along the Galactic plane in the 1-0 S(1) emission line of molecular hydrogen at 2.122 µm using the United Kingdom Infrared Telescope. In this paper, we are focu…