Search Publications
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…
Star formation towards the southern cometary H II region IRAS 17256-3631
Chandrasekhar, T.; Vig, S.; Ghosh, S. K. +4 more
IRAS 17256-3631 is a southern Galactic massive star-forming region located at a distance of 2 kpc. In this paper, we present a multiwavelength investigation of the embedded cluster, the H II region, as well as the parent cloud. Radio images at 325, 610 and 1372 MHz were obtained using Giant Metrewave Radio Telescope, India while the near-infrared …
Spectroscopic study of the HgMn star HD 49606: the quest for binarity, abundance stratifications and magnetic field
Giarrusso, M.; Leone, F.; Scalia, C. +4 more
In this paper, we present a multi-instrument analysis of the mercury-manganese star HD 49606. New spectroscopic observations have been obtained by us with Catania Astrophysical Observatory Spectropolarimeter (CAOS@OAC) and High Accuracy Radial Velocity Planet Searcher-North@Telescopio Nazionale Galileo (HARPS-N@TNG). Combining these observations w…
H-ATLAS/GAMA: the nature and characteristics of optically red galaxies detected at submillimetre wavelengths
Cooray, A.; Hony, S.; De Zotti, G. +39 more
We combine Herschel/SPIRE submillimetre (submm) observations with existing multiwavelength data to investigate the characteristics of low-redshift, optically red galaxies detected in submm bands. We select a sample of galaxies in the redshift range 0.01 ≤ z ≤ 0.2, having >5σ detections in the SPIRE 250 µm submm waveband. Sources are then …
Population of post-nova supersoft X-ray sources
Gilfanov, Marat; Bildsten, Lars; Soraisam, Monika D. +1 more
Novae undergo a supersoft X-ray phase of varying duration after the optical outburst. Such transient post-nova supersoft X-ray sources (SSSs) are the majority of the observed SSSs in M31. In this paper, we use the post-nova evolutionary models of Wolf et al. to compute the expected population of post-nova SSSs in M31. We predict that depending on …
The clustering amplitude of X-ray-selected AGN at z ∼ 0.8: evidence for a negative dependence on accretion luminosity
Georgakakis, A.; Salvato, M.; Liu, Z. +5 more
The northern tile of the wide-area and shallow XMM-XXL X-ray survey field is used to estimate the average dark matter halo mass of relatively luminous X-ray-selected active galactic nucleus (AGN) [log {L}_X (2-10 keV)= 43.6^{+0.4}_{-0.4} erg s^{-1}] in the redshift interval z = 0.5-1.2. Spectroscopic follow-up observations of X-ray sources in the …
[Fe II] jets from intermediate-mass protostars in Carina
Smith, Nathan; Bally, John; Reiter, Megan
We present new HST/WFC3-IR narrow-band [Fe II] images of protostellar jets in the Carina Nebula. Combined with five previously published sources, we have a sample of 18 jets and two Herbig-Haro (HH) objects. All of the jets we targeted with Wide-Field Camera 3 (WFC3) show bright infrared [Fe II] emission, and a few Hα candidate jets are confirmed …