Search Publications
Gullies and landslides on the Moon: Evidence for dry-granular flows
Mustard, John; Ostrach, Lillian R.; Kiran Kumar, A. S. +7 more
High-resolution images from Chandrayaan-1 Terrain Mapping Camera and Lunar Reconnaissance Orbiter Camera reveal landslides and gully formation on the interior wall of a 7 km-diameter simple crater emplaced in Schrödinger basin on the farside of the Moon. These features occur on the steep upper crater wall, where the slope is ~35°. The gullies show…
Finding rare AGN: XMM-Newton and Chandra observations of SDSS Stripe 82
Nandra, Kirpal; Schawinski, Kevin; Comastri, Andrea +15 more
We have analysed the XMM-Newton and Chandra data overlapping ∼16.5 deg2 of Sloan Digital Sky Survey Stripe 82, including ∼4.6 deg2 of proprietary XMM-Newton data that we present here. In total, 3362 unique X-ray sources are detected at high significance. We derive the XMM-Newton number counts and compare them with our previou…
Herschel observations of the Sagittarius B2 cores: Hydrides, warm CO, and cold dust
Wu, R.; Bally, J.; Cernicharo, J. +6 more
Context. Sagittarius B2 is one of the most massive and luminous star-forming regions in the Galaxy and shows a very rich chemistry and physical conditions similar to those in much more distant extragalactic starbursts.
Aims: We present large-scale far-infrared/submillimeter photometric images and broadband spectroscopic maps taken with the PA…
Six millisecond pulsars detected by the Fermi Large Area Telescope and the radio/gamma-ray connection of millisecond pulsars
Camilo, F.; Çelik, Ö.; Guillemot, L. +23 more
We report on the discovery of gamma-ray pulsations from five millisecond pulsars (MSPs) using the Fermi Large Area Telescope (LAT) and timing ephemerides provided by various radio observatories. We also present confirmation of the gamma-ray pulsations from a sixth source, PSR J2051-0827. Five of these six MSPs are in binary systems: PSRs J1713+074…
Optical polarimetry of the inner Crab nebula and pulsar
De Luca, A.; Mignani, R. P.; Laurent, P. +4 more
Time-resolved polarization measurements of pulsars offer a unique insight into the geometry of their emission regions. Such measurements provide observational constraints on the different models proposed for the pulsar emission mechanisms. Optical polarization data of the Crab nebula were obtained from the Hubble Space Telescope (HST) archive. The…
Infrared emission and the destruction of dust in HII regions
Wiebe, D. S.; Kirsanova, M. S.; Pavlyuchenkov, Ya. N.
The generation of infrared (IR) radiation and the observed IR-intensity distribution at wavelengths of 8, 24, and 100 µm in the ionized hydrogen region around a young, massive star is investigated. The evolution of the HII region is treated using a self-consistent chemical-dynamical model in which three dust populations are included—large silicate…
Herschel Observations of Gas and Dust in the Unusual 49 Ceti Debris Disk
Dent, W. R. F.; Woitke, P.; Kamp, I. +12 more
We present far-IR/sub-mm imaging and spectroscopy of 49 Ceti, an unusual circumstellar disk around a nearby young A1V star. The system is famous for showing the dust properties of a debris disk, but the gas properties of a low-mass protoplanetary disk. The data were acquired with the Herschel Space Observatory PACS and SPIRE instruments, largely a…
Water Vapor in the Protoplanetary Disk of DG Tau
Pinte, C.; Ménard, F.; Woitke, P. +13 more
Water is key in the evolution of protoplanetary disks and the formation of comets and icy/water planets. While high-excitation water lines originating in the hot inner disk have been detected in several T Tauri stars (TTSs), water vapor from the outer disk, where most water ice reservoirs are stored, was only reported in the nearby TTS TW Hya. We …
Inferring the mass of submillimetre galaxies by exploiting their gravitational magnification of background galaxies
Pérez-Fournon, I.; Valtchanov, I.; Ivison, R. J. +25 more
Dust emission at submillimetre wavelengths allows us to trace the early phases of star formation in the Universe. In order to understand the physical processes involved in this mode of star formation, it is essential to gain knowledge about the dark matter structures - most importantly their masses - that submillimetre galaxies live in. Here we us…
Planck intermediate results. VII. Statistical properties of infrared and radio extragalactic sources from the Planck Early Release Compact Source Catalogue at frequencies between 100 and 857 GHz
Kneissl, R.; Bernard, J. -P.; Planck Collaboration +188 more
We make use of the Planck all-sky survey to derive number counts and spectral indices of extragalactic sources - infrared and radio sources - from the Planck Early Release Compact Source Catalogue (ERCSC) at 100 to 857 GHz (3 mm to 350 µm). Three zones (deep, medium and shallow) of approximately homogeneous coverage are used to permit a clea…