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Gravitational slopes, geomorphology, and material strengths of the nucleus of comet 67P/Churyumov-Gerasimenko from OSIRIS observations
Jorda, L.; Lara, L. M.; Bertaux, J. -L. +49 more
Aims: We study the link between gravitational slopes and the surface morphology on the nucleus of comet 67P/Churyumov-Gerasimenko and provide constraints on the mechanical properties of the cometary material (tensile, shear, and compressive strengths).
Methods: We computed the gravitational slopes for five regions on the nucleus that are…
The Panchromatic Hubble Andromeda Treasury. XI. The Spatially Resolved Recent Star Formation History of M31
Bell, Eric F.; Monachesi, Antonela; Dolphin, Andrew E. +15 more
We measure the recent star formation history (SFH) across M31 using optical images taken with the Hubble Space Telescope as part of the Panchromatic Hubble Andromeda Treasury (PHAT). We fit the color-magnitude diagrams in ∼9000 regions that are ∼100 pc × 100 pc in projected size, covering a 0.5 square degree area (∼380 kpc2, deprojected…
Neutral Hydrogen Structures Trace Dust Polarization Angle: Implications for Cosmic Microwave Background Foregrounds
Peek, J. E. G.; Hill, J. Colin; Clark, S. E. +2 more
Using high-resolution data from the Galactic Arecibo L-Band Feed Array HI (GALFA-Hi) survey, we show that linear structure in Galactic neutral hydrogen (Hi) correlates with the magnetic field orientation implied by Planck 353 GHz polarized dust emission. The structure of the neutral interstellar medium is more tightly coupled to the magnetic field…
HST hot-Jupiter transmission spectral survey: haze in the atmosphere of WASP-6b
Aigrain, S.; Pont, F.; Fortney, J. J. +14 more
We report Hubble Space Telescope optical to near-infrared transmission spectroscopy of the hot-Jupiter WASP-6b, measured with the Space Telescope Imaging Spectrograph and Spitzer's InfraRed Array Camera. The resulting spectrum covers the range 0.29-4.5 µm. We find evidence for modest stellar activity of WASP-6 and take it into account in the…
Composite bulges: the coexistence of classical bulges and discy pseudo-bulges in S0 and spiral galaxies
Beckman, John E.; Bender, Ralf; Thomas, Jens +6 more
We present an analysis of nine S0-Sb galaxies which have (photometric) bulges consisting of two distinct components. The outer component is a flattened, kinematically cool, disc-like structure: a `discy pseudo-bulge'. Embedded inside is a rounder, kinematically hot spheroidal structure: a `classical bulge'. This indicates that pseudo-bulges and cl…
A Deep Hubble Space Telescope and Keck Search for Definitive Identification of Lyman Continuum Emitters at z~3.1
Dickinson, Mark; Ferguson, Henry C.; Giavalisco, Mauro +13 more
Narrowband imaging of the rest-frame Lyman continuum (LyC) of galaxies at z∼ 3.1 has produced a large number of candidate LyC-emitting galaxies. These samples are contaminated by galaxies at lower redshift. To better understand LyC escape, we need an uncontaminated sample of galaxies that emit strongly in the LyC. Here we present deep Hubble Space…
Coevolution of brightest cluster galaxies and intracluster light using CLASH
Hilton, Matt; Burke, Claire; Collins, Chris
We examine the stellar mass assembly in galaxy cluster cores using data from the Cluster Lensing And Supernova survey with Hubble (CLASH). We measure the growth of brightest cluster galaxy (BCG) stellar mass, the fraction of the total cluster light which is in the intracluster light (ICL) and the numbers of mergers that occur in the BCG over the r…
Coordinated X-Ray, Ultraviolet, Optical, and Radio Observations of the PSR J1023+0038 System in a Low-mass X-Ray Binary State
Deller, Adam T.; Lyne, Andrew G.; Bogdanov, Slavko +14 more
The PSR J1023+0038 binary system hosts a neutron star and a low-mass, main-sequence-like star. It switches on year timescales between states as an eclipsing radio millisecond pulsar and a low-mass X-ray binary (LMXB). We present a multi-wavelength observational campaign of PSR J1023+0038 in its most recent LMXB state. Two long XMM-Newton observati…
The timing and location of dust formation in the remnant of SN 1987A
Barlow, M. J.; Wesson, R.; Matsuura, M. +1 more
The discovery with the Herschel Space Observatory of bright far-infrared and submm emission from the ejecta of the core-collapse supernova SN 1987A has been interpreted as indicating the presence of some 0.4-0.7 M⊙ of dust. We have constructed radiative transfer models of the ejecta to fit optical to far-infrared observations from the l…
Understanding star formation in molecular clouds. I. Effects of line-of-sight contamination on the column density structure
André, Ph.; Schneider, N.; Ossenkopf, V. +6 more
Column-density maps of molecular clouds are one of the most important observables in the context of molecular cloud- and star-formation (SF) studies. With the Herschel satellite it is now possible to precisely determine the column density from dust emission, which is the best tracer of the bulk of material in molecular clouds. However, line-of-sig…