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Identifying IGR J14091-6108 as a magnetic CV with a massive white dwarf using X-ray and optical observations
Strader, Jay; Chomiuk, Laura; Rahoui, Farid +3 more
INTEGRAL Gamma-Ray (IGR) J14091-6108 is a Galactic X-ray source known to have an iron emission line, a hard X-ray spectrum, and an optical counterpart. Here, we report on X-ray observations of the source with XMM-Newton and NuSTAR as well as optical spectroscopy with European Southern Obseratory/Very Large Telescope and National Optical Astronomy …
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 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…
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 …
Interstellar dust distribution outside the heliopause: deflection at the heliospheric interface
Katushkina, O. A.; Izmodenov, V. V.; Alexashov, D. B. +1 more
We developed a numerical model of the interstellar dust distribution in the global heliosphere including the heliospheric interface, where the solar wind plasma interacts with the local interstellar plasma. The model is based on the plasma distributions obtained by the 3D kinetic-magnetohydrodynamic model of the heliospheric interface developed by…
First in-situ detection of the cometary ammonium ion NH_4+ (protonated ammonia NH3) in the coma of 67P/C-G near perihelion
Altwegg, K.; Balsiger, H.; Fuselier, S. A. +21 more
In this paper, we report the first in situ detection of the ammonium ion NH_4+ at 67P/Churyumov-Gerasimenko (67P/C-G) in a cometary coma, using the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA)/Double Focusing Mass Spectrometer (DFMS). Unlike neutral and ion spectrometers onboard previous cometary missions, the ROSI…
Properties of dust particles in comets from photometric and polarimetric observations of 67P
Lasue, J.; Hines, D. C.; Sen, A. K. +3 more
Remote observations of the light scattered by dust particles in comet 67P/Churyumov-Gerasimenko (67P/C-G) (photometry and imaging polarimetry) allow us to compare the deduced physical properties of these particles with in situ measurements provided by the Rosetta mission. Onboard experiments on the dust confirm properties inferred from polarimetri…
On the connection between the metal-enriched intergalactic medium and galaxies: an O VI-galaxy cross-correlation study at z < 1
Tejos, Nicolas; Morris, Simon L.; Fumagalli, Michele +10 more
We present new results on the auto- and cross-correlation functions of galaxies and O VI absorbers in a ∼18 Gpc3 comoving volume at z < 1. We use a sample of 51 296 galaxies and 140 O VI absorbers in the column density range 13 ≲ log N ≲ 15 to measure two-point correlation functions in the two dimensions transverse and orthogonal to …
Blue straggler star populations in globular clusters - II. Proper-motion cleaned HST catalogues of BSSs in 38 Galactic GCs
Puzia, Thomas H.; Simunovic, Mirko
We present new blue straggler star (BSS) catalogues in 38 Milky Way globular clusters (GCs) based on multipassband and multi-epoch treasury survey data from the Hubble Space Telescope. We measure precise astrometry and relative proper motions of stars in all target clusters and performed a subsequent cluster membership selection. We study the accu…