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Radio Galaxy Zoo: discovery of a poor cluster through a giant wide-angle tail radio galaxy
Heywood, I.; Vaughan, S.; Hardcastle, M. J. +15 more
We have discovered a previously unreported poor cluster of galaxies (RGZ-CL J0823.2+0333) through an unusual giant wide-angle tail radio galaxy found in the Radio Galaxy Zoo project. We obtained a spectroscopic redshift of z = 0.0897 for the E0-type host galaxy, 2MASX J08231289+0333016, leading to Mr = -22.6 and a 1.4 GHz radio luminosi…
The Simud-Tiu Valles hydrologic system: A multidisciplinary study of a possible site for future Mars on-site exploration
Pajola, Maurizio; Mancarella, Francesca; Rossato, Sandro +4 more
When looking for traces of past life on Mars, we have to look primarily for places where water was present, possibly for long time intervals. The Simud and Tiu Valles are two large outflow channels connected to the north with the Chryse Basin, Oxia Palus quadrangle. The area, carved by water during the Noachian/Early Hesperian is characterized by …
Mapping CO Gas in the GG Tauri A Triple System with 50 au Spatial Resolution
Tang, Ya-Wen; Dutrey, Anne; Di Folco, Emmanuel +11 more
We aim to unveil the observational imprint of physical mechanisms that govern planetary formation in the young, multiple system GG Tau A. We present ALMA observations of 12CO and 13CO 3-2 and 0.9 mm continuum emission with 0.″35 resolution. The 12CO 3-2 emission, found within the cavity of the circumternary dust ri…
The dustier early-type galaxies deviate from late-type galaxies' scaling relations
Barmby, P.; Madden, S. C.; Lianou, S. +1 more
Several dedicated surveys focusing on early-type galaxies (ETGs) reveal that significant fractions of them are detectable in all interstellar medium phases studied to date. We select ETGs from the Herschel Reference Survey that have both far-infrared Herschel and either H I or CO detection (or both). We derive their star formation rates (SFRs), st…
Variations in cometary dust composition from Giotto to Rosetta, clues to their formation mechanisms
Langevin, Yves; Fischer, Henning; Briois, Christelle +18 more
This paper reviews the current knowledge on the composition of cometary dust (ice, minerals and organics) in order to constrain their origin and formation mechanisms. Comets have been investigated by astronomical observations, space missions (Giotto to Rosetta), and by the analysis of cometary dust particles collected on Earth, chondritic porous i…
Ultramassive dense early-type galaxies: Velocity dispersions and number density evolution since z = 1.6
Gargiulo, A.; Saracco, P.; Tamburri, S. +2 more
Aims: We investigate the stellar mass assembly history of ultramassive (M⋆ ≳ 1011M⊙) dense (Σ = M⋆/2πRe2> 2500M⊙ pc-2) early-type galaxies (ETGs, elliptical and spheroidal galaxies) selected on basis of visual classification over the last 9 Gyr.
Me…
A Search for Hyperluminous X-Ray Sources in the XMM-Newton Source Catalog
Bachetti, M.; Godet, O.; Webb, N. A. +2 more
We present a new method to identify luminous off-nuclear X-ray sources in the outskirts of galaxies from large public redshift surveys, distinguishing them from foreground and background interlopers. Using the 3XMM-DR5 catalog of X-ray sources and the SDSS DR12 spectroscopic sample of galaxies, with the help of this off-nuclear cross-matching tech…
Chandra X-Ray and Hubble Space Telescope Imaging of Optically Selected Kiloparsec-scale Binary Active Galactic Nuclei. II. Host Galaxy Morphology and AGN Activity
Shen, Yue; Ho, Luis C.; Strauss, Michael A. +4 more
Binary active galactic nuclei (AGNs) provide clues to how gas-rich mergers trigger and fuel AGNs and how supermassive black hole (SMBH) pairs evolve in a gas-rich environment. While significant effort has been invested in their identification, the detailed properties of binary AGNs and their host galaxies are still poorly constrained. In a compani…
Systematic or signal? How dark matter misalignments can bias strong lensing models of galaxy clusters
Kneib, J. P.; Jauzac, M.; Harvey, D.
We explore how assuming that mass traces light in strong gravitational lensing models can lead to systematic errors in the predicted position of multiple images. Using a model based on the galaxy cluster MACS J0416 (z = 0.397) from the Hubble Frontier Fields, we split each galactic halo into a baryonic and dark matter component. We then shift the …
Improved algorithm for the transmittance estimation of spectra obtained with SOIR/Venus Express
Bertaux, Jean-Loup; Vandaele, Ann Carine; Ristic, Bojan +5 more