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Herschel observations of embedded protostellar clusters in the Rosette molecular cloud
Olofsson, G.; Abergel, A.; Hill, T. +39 more
The Herschel OB young stellar objects survey (HOBYS) has observed the Rosette molecular cloud, providing an unprecedented view of its star formation activity. These new far-infrared data reveal a population of compact young stellar objects whose physical properties we aim to characterise. We compiled a sample of protostars and their spectral energ…
Suzaku and BeppoSAX X-ray Spectra of the Persistently Accreting Neutron-star Binary 4U 1705-44
Remillard, Ronald A.; Homan, Jeroen; Lin, Dacheng
We present an analysis of the broadband spectra of 4U 1705-44 obtained with Suzaku in 2006-2008 and by BeppoSAX in 2000. The source exhibits two distinct states: the hard state shows emission from 1 to 150 keV, while the soft state is mostly confined to be <40 keV. We model soft-state continuum spectra with two thermal components, one of which …
Metal Depletion and Warm H2 in the Brown Dwarf 2M1207 Accretion Disk
Brown, Alexander; France, Kevin; Linsky, Jeffrey L. +2 more
We present new far-ultraviolet observations of the young M8 brown dwarf 2MASS J12073346-3932539, which is surrounded by an accretion disk. The data were obtained using the Hubble Space Telescope-Cosmic Origins Spectrograph. Moderate-resolution spectra (R≈ 17,000-18,000) obtained in the 1150-1750 Å and 2770-2830 Å bandpasses reveal H2 em…
A Universal Law for Solar-wind Turbulence at Electron Scales
Galtier, S.; Meyrand, R.
The interplanetary magnetic fluctuation spectrum obeys a Kolmogorovian power law at scales above the proton inertial length and gyroradius which is well regarded as an inertial range. Below these scales, a power-law index around -2.5 is often measured and associated with nonlinear dispersive processes. Recent observations reveal a third region at …
LoCuSS: Probing galaxy transformation physics with Herschel
Zhang, Y. -Y.; Finoguenov, A.; Smith, G. P. +12 more
We present an early broad-brush analysis of Herschel/PACS observations of star-forming galaxies in 8 galaxy clusters drawn from our survey of 30 clusters at z ≃ 0.2. We define a complete sample of 192 spectroscopically confirmed cluster members down to LTIR > 3 × 1010 L⊙ and LK > 0.25 L_K^star. The…
Solar Polar Fields During Cycles 21 - 23: Correlation with Meridional Flows
Janardhan, P.; Gosain, S.; Bisoi, Susanta K.
We have examined polar magnetic fields for the last three solar cycles, viz. Cycles 21, 22, and 23 using NSO/Kitt Peak synoptic magnetograms. In addition, we have used SOHO/MDI magnetograms to derive the polar fields during Cycle 23. Both Kitt Peak and MDI data at high latitudes (78° - 90°) in both solar hemispheres show a significant drop in the …
Interpretation and analysis of planetary structures
Hauber, Ernst; Okubo, Chris H.; Watters, Thomas R. +2 more
Structural geology is an integral part of planetary science. Planetary structures provide the framework for determining the character and sequence of crustal deformation while simultaneously establishing the observational basis required to test geodynamic hypotheses for the deformation of planetary and satellite lithospheres. The availability of d…
Herschel observations of FIR emission lines in brightest cluster galaxies
Böhringer, H.; Popesso, P.; Jaffe, W. +24 more
The question of how much gas cools in the cores of clusters of galaxies has been the focus of many, multiwavelength studies in the past 30 years. In this letter we present the first detections of the strongest atomic cooling lines, [Cii], [Oi] and [Nii] in two strong cooling flow clusters, A1068 and A2597, using Herschel-PACS. These spectra indica…
Noachian-Hesperian geologic history of the Echus Chasma and Kasei Valles system on Mars: New data and interpretations
Mangold, Nicolas; van Gasselt, Stephan; Neukum, Gerhard +8 more
New high-resolution datasets have prompted a mapping-based study of the 2500-km-long Echus Chasma and Kasei Valles system that utilizes geomorphic details, stratigraphic relations, and cratering statistics derived from the new datasets. Our results suggest that between the Hesperian and Amazonian Epochs on Mars (3.7 Ga to Recent) the study area wa…
Stars and dark matter in the spiral gravitational lens 2237+0305
Treu, T.; Koopmans, L. V. E.; Webster, R. L. +1 more
We construct a mass model for the spiral lens galaxy 2237+0305, at redshift zl = 0.04, based on gravitational-lensing constraints, HI rotation, and new stellar-kinematic information, based on data taken with the Echelle Spectrograph and Imager (ESI) spectrograph on the 10-m Keck-II Telescope. High-resolution rotation curves and velocity…