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Latitudinal and altitudinal controls of Titan's dune field morphometry
Janssen, M. A.; Hayes, A. G.; Encrenaz, P. +5 more
Dune fields dominate ∼13% of Titan's surface and represent an important sink of carbon in the methane cycle. Herein, we discuss correlations in dune morphometry with altitude and latitude. These correlations, which have important implications in terms of geological processes and climate on Titan, are investigated through the microwave electromagne…
Extreme Host Galaxy Growth in Powerful Early-epoch Radio Galaxies
Haas, Martin; Barthel, Peter; Wilkes, Belinda +1 more
During the first half of the universe's life, a heyday of star formation must have occurred because many massive galaxies are in place after that epoch in cosmic history. Our observations with the revolutionary Herschel Space Observatory reveal vigorous optically obscured star formation in the ultra-massive hosts of many powerful high-redshift 3C …
Measuring star formation in high-z massive galaxies: a mid-infrared to submillimetre study of the GOODS NICMOS Survey sample
Netterfield, C. B.; Scott, D.; Halpern, M. +16 more
We present measurements of the mean mid-infrared to submillimetre flux densities of massive (M★≳ 1011 M⊙) galaxies at redshifts 1.7 < z < 2.9, obtained by stacking positions of known objects taken from the GOODS NICMOS Survey (GNS) catalogue on maps at 24 ?m (Spitzer/MIPS); 70, 100 and 160 ?m (Herschel/PACS);…
Mutual events in the Cold Classical transneptunian binary system Sila and Nunam
Buie, M. W.; Rabinowitz, D. L.; Grundy, W. M. +9 more
Hubble Space Telescope observations between 2001 and 2010 resolved the binary components of the Cold Classical transneptunian object (79360) Sila-Nunam (provisionally designated 1997 CS29). From these observations we have determined the circular, retrograde mutual orbit of Nunam relative to Sila with a period of 12.50995 ± 0.00036 days …
Cores in infrared dark clouds (IRDCs) seen in the Hi-GAL survey between l= 300° and 330°
Peretto, N.; Elia, D.; Griffin, M. J. +15 more
We have used data taken as part of the Herschel infrared Galactic Plane survey (Hi-GAL) to study 3171 infrared dark cloud (IRDC) candidates that were identified in the mid-IR (8 µm) by Spitzer (we refer to these as `Spitzer-dark' regions). They all lie in the range l= 300-330° and |b|≤ 1°. Of these, only 1205 were seen in emission in the far…
Chandra and HST Imaging of the Quasars PKS B0106+013 and 3C 345: Inverse Compton X-Rays and Magnetized Jets
Marshall, H. L.; Kharb, P.; Lister, M. L. +1 more
We present results from deep (~70 ks) Chandra/ACIS observations and Hubble Space Telescope (HST) Advanced Camera for Surveys F475W observations of two highly optically polarized quasars belonging to the MOJAVE blazar sample, viz., PKS B0106+013 and 1641+399 (3C 345). These observations reveal X-ray and optical emissions from the jets in both sourc…
Herschel/HIFI observations of molecular emission in protoplanetary nebulae and young planetary nebulae
Waters, L. B. F. M.; Menten, K. M.; Olofsson, H. +16 more
Aims: We aim to study the physical conditions, particularly the excitation state, of the intermediate-temperature gas in protoplanetary nebulae and young planetary nebulae (PPNe, PNe). The information that the observations of the different components deliver is of particular importance for understanding the evolution of these objects.
Me…
Circulation of the Venus upper mesosphere/lower thermosphere: Doppler wind measurements from 2001-2009 inferior conjunction, sub-millimeter CO absorption line observations
Moriarty-Schieven, Gerald; Clancy, R. Todd; Sandor, Brad J.
Sub-millimeter 12CO (346 GHz) and 13CO (330 GHz) line absorptions, formed within the mesospheric to lower thermospheric altitude (70-120 km) region of the Venus atmosphere, have been mapped across the nightside disk of Venus during 2001-2009 inferior conjunctions, employing the James Clerk Maxwell Telescope (JCMT). Radiative …
Kinematics and helicity evolution of a loop-like eruptive prominence
Vial, J. -C.; Madjarska, M. S.; Schrijver, C. J. +4 more
Aims: We aim at investigating the morphology as well as kinematic and helicity evolution of a loop-like prominence during its eruption.
Methods: We used multi-instrument observations from AIA/SDO, EUVI/STEREO and LASCO/SoHO. The kinematic, morphological, geometrical, and helicity evolution of a loop-like eruptive prominence were studied …
Spectroscopic observations of propagating disturbances in a polar coronal hole: evidence of slow magneto-acoustic waves
Solanki, S. K.; Marsch, E.; Teriaca, L. +2 more
Aims: We focus on detecting and studying quasi-periodic propagating features that have been interpreted in terms of both slow magneto-acoustic waves and of high-speed upflows.
Methods: We analyzed long-duration spectroscopic observations of the on-disk part of the south polar coronal hole taken on 1997 February 25 by the SUMER spectromet…