Search Publications
Cold Milky Way HI Gas in Filaments
Kerp, J.; Winkel, B.; Lenz, D. +4 more
We investigate data from the Galactic Effelsberg-Bonn H I Survey, supplemented with data from the third release of the Galactic All Sky Survey (GASS III) observed at Parkes. We explore the all-sky distribution of the local Galactic H I gas with | {v}{{LSR}}| \lt 25 km s-1 on angular scales of 11‧-16‧. Unsharp masking is appli…
Repetitive patterns in rapid optical variations in the nearby black-hole binary V404 Cygni
Ruiz, Javier; Enoto, Teruaki; Nogami, Daisaku +65 more
How black holes accrete surrounding matter is a fundamental yet unsolved question in astrophysics. It is generally believed that matter is absorbed into black holes via accretion disks, the state of which depends primarily on the mass-accretion rate. When this rate approaches the critical rate (the Eddington limit), thermal instability is supposed…
Cosmological hints of modified gravity?
Di Valentino, Eleonora; Melchiorri, Alessandro; Silk, Joseph
The recent measurements of cosmic microwave background (CMB) temperature and polarization anisotropies made by the Planck satellite have provided impressive confirmation of the Λ CDM cosmological model. However interesting hints of slight deviations from Λ CDM have been found, including a 95% C.L. preference for a "modified gravity" (MG) structure…
Shining a light on galactic outflows: photoionized outflows
Chisholm, John; Leitherer, Claus; Chen, Yanmei +2 more
We study the ionization structure of galactic outflows in 37 nearby, star-forming galaxies with the Cosmic Origins Spectrograph on the Hubble Space Telescope. We use the O I, Si II, Si III, and Si IV ultraviolet absorption lines to characterize the different ionization states of outflowing gas. We measure the equivalent widths, line widths, and ou…
A narrow, edge-on disk resolved around HD 106906 with SPHERE
Henning, T.; Brandner, W.; Milli, J. +39 more
Context. HD 106906AB is the only young binary system so far around which a planet has been imaged and a debris disk has been shown to exist, thanks to a strong IR excess. As such, it represents a unique opportunity for studying the dynamics of young planetary systems.
Aims: We aim at further investigating the close (tens of au scales) environ…
Hooked Flare Ribbons and Flux-rope-related QSL Footprints
Li, Hui; Aulanier, Guillaume; Schmieder, Brigitte +3 more
We studied the magnetic topology of active region 12158 on 2014 September 10 and compared it with the observations before and early in the flare that begins at 17:21 UT (SOL2014-09-10T17:45:00). Our results show that the sigmoidal structure and flare ribbons of this active region observed by the Solar Dynamics Observatory/Atmospheric Imaging Assem…
The far-infrared emitting region in local galaxies and QSOs: Size and scaling relations
Berta, S.; Lutz, D.; Förster Schreiber, N. M. +9 more
We use Herschel 70 to 160 µm images to study the size of the far-infrared emitting region in about 400 local galaxies and quasar (QSO) hosts. The sample includes normal "main-sequence" star-forming galaxies, as well as infrared luminous galaxies and Palomar-Green QSOs, with different levels and structures of star formation. Assuming Gaussian…
Titan's surface at 2.18-cm wavelength imaged by the Cassini RADAR radiometer: Results and interpretations through the first ten years of observation
Lorenz, R. D.; Janssen, M. A.; Hayes, A. G. +12 more
A comprehensive calibration and mapping of the thermal microwave emission from Titan's surface is reported based on radiometric data obtained at 2.18-cm wavelength by the passive radiometer included in the Cassini RADAR instrument. Compared to previous work, the present results incorporate the much larger data set obtained in the approximately ten…
First Images of Debris Disks around TWA 7, TWA 25, HD 35650, and HD 377
Stark, Christopher C.; Schneider, Glenn; Chen, Christine H. +15 more
We present the first images of four debris disks observed in scattered light around the young (4-250 Myr old) M dwarfs TWA 7 and TWA 25, the K6 star HD 35650, and the G2 star HD 377. We obtained these images by reprocessing archival Hubble Space Telescope NICMOS coronagraph data with modern post-processing techniques as part of the Archival Legacy…
The XXL Survey . IV. Mass-temperature relation of the bright cluster sample
Smith, G. P.; Chiappetti, L.; Pierre, M. +18 more
Context. The XXL Survey is the largest survey carried out by XMM-Newton. Covering an area of 50 deg2, the survey contains ~450 galaxy clusters out to a redshift ~2 and to an X-ray flux limit of ~ 5 × 10-15 erg s-1 cm-2. This paper is part of the first release of XXL results focussed on the bright cluster…