Search Publications
Nightside ionosphere of Mars: Radar soundings by the Mars Express spacecraft
Gurnett, D. A.; Němec, F.; Morgan, D. D. +1 more
We present results of a survey of the nightside ionosphere of Mars as observed by Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) on board the Mars Express spacecraft. The occurrence rate of the nightside ionosphere is studied as a function of solar zenith angle (SZA), magnetic field magnitude, and magnetic field inclination. …
HerMES: Halo occupation number and bias properties of dusty galaxies from angular clustering measurements
Aussel, H.; Elbaz, D.; Valtchanov, I. +75 more
We measure the angular correlation function, w(θ), from 0.5 to 30 arcmin of detected sources in two wide fields of the Herschel Multi-tiered Extragalactic Survey (HerMES). Our measurements are consistent with the expected clustering shape from a population of sources that trace the dark matter density field, including non-linear clustering at arcm…
Photometric mapping of Asteroid (4) Vesta’s southern hemisphere with Hubble Space Telescope
Parker, Joel Wm.; Russell, Christopher T.; Thomas, Peter C. +6 more
We present the surface mapping of the southern hemisphere of Asteroid (4) Vesta obtained from Hubble Space Telescope (HST). From 105 images of Vesta through four filters in the wavelengths best to characterize the 1-µm pyroxene band, we constructed albedo and color-ratio maps of Vesta. These new maps cover latitudes -50° to +20°. The souther…
Isolated Wolf-Rayet Stars and O Supergiants in the Galactic Center Region Identified Via Paschen-α Excess
Morris, M. R.; Wang, Q. D.; Mauerhan, J. C. +4 more
We report the discovery of 19 hot, evolved, massive stars near the Galactic center region (GCR). These objects were selected for spectroscopy owing to their detection as strong sources of Paschen-α (Pα) emission-line excess, following a narrowband imaging survey of the central 0fdg65 × 0fdg25 (l, b) around Sgr A* with the Hubble Space Telescope. D…
Flow patterns of lobate debris aprons and lineated valley fill north of Ismeniae Fossae, Mars: Evidence for extensive mid-latitude glaciation in the Late Amazonian
Head, James W.; Baker, David M. H.; Marchant, David R.
A variety of Late Amazonian landforms on Mars have been attributed to the dynamics of ice-related processes. Evidence for large-scale, mid-latitude glacial episodes existing within the last 100 million to 1 billion years on Mars has been presented from analyses of lobate debris aprons (LDA) and lineated valley fill (LVF) in the northern and southe…
A new population of planetary nebulae discovered in the Large Magellanic Cloud - III. The luminosity function
Parker, Quentin A.; Reid, Warren A.
Our previous identification and spectroscopic confirmation of 431 faint, new planetary nebulae (PNe) in the central 25 deg2 region of the Large Magellanic Cloud (LMC) permit us to now examine the shape of the LMC planetary nebula luminosity function (PNLF) through an unprecedented 10 mag range. The majority of our newly discovered and p…
Mapping the mesospheric CO 2 clouds on Mars: MEx/OMEGA and MEx/HRSC observations and challenges for atmospheric models
Bibring, J. -P.; Gondet, B.; Forget, F. +9 more
This study presents the latest results on the mesospheric CO 2 clouds in the martian atmosphere based on observations by OMEGA and HRSC onboard Mars Express. We have mapped the mesospheric CO 2 clouds during nearly three martian years of OMEGA data yielding a cloud dataset of ∼60 occurrences. The global mapping shows that the…
A high-resolution line survey of IRC +10216 with Herschel/HIFI. First results: Detection of warm silicon dicarbide (SiC{_2})
Waters, L. B. F. M.; Liseau, R.; Teyssier, D. +24 more
We present the first results of a high-spectral-resolution survey of the carbon-rich evolved star IRC+10216 that was carried out with the HIFI spectrometer onboard Herschel. This survey covers all HIFI bands, with a spectral range from 488 to 1901 GHz. In this letter we focus on the band-1b spectrum, in a spectral range 554.5-636.5 GHz, where we i…
PEP: First Herschel probe of dusty galaxy evolution up to z ~ 3
Berta, S.; Magnelli, B.; Nordon, R. +32 more
Aims: We exploit the deepest existing far-infrared (FIR) data obtained so far by Herschel at 100 and 160 µm in the GOODS-N, as part of the PACS evolutionary probe (PEP) survey, to derive for the first time the evolution of the rest-frame 60-µm, 90-µm, and total IR luminosity functions (LFs) of galaxies and AGNs from z = 0 to…
The Kinematics of Ionized Gas in Lyman-break Analogs at z ~ 0.2
Law, David R.; Rich, R. Michael; Overzier, Roderik +7 more
We present results for 19 "Lyman-break analogs" observed with Keck/OSIRIS with an adaptive-optics-assisted spatial resolution of less than 200 pc. We detect satellites/companions, diffuse emission, and velocity shear, all with high signal-to-noise ratios. These galaxies present remarkably high velocity dispersion along the line of sight (~70 km s<…