Science Archives Publication System

The massive protostar W43-MM1 as seen by Herschel-HIFI water spectra: high turbulence and accretion luminosity

DOI: 10.1051/0004-6361/201118413 Bibcode: 2012A&A...542A..76H

Braine, J.; Bontemps, S.; van Dishoeck, E. F. +7 more

Aims: We present Herschel-HIFI observations of 14 water lines in W43-MM1, a massive protostellar object in the luminous star-cluster-forming region W43. We place our study in the more general context of high-mass star formation. The dynamics of these regions may be represented by either the monolithic collapse of a turbulent core, or competit…

2012 • Astronomy and Astrophysics

Herschel 50

On the Role of the Background Overlying Magnetic Field in Solar Eruptions

DOI: 10.1088/2041-8205/748/1/L6 Bibcode: 2012ApJ...748L...6N

Wiegelmann, T.; Patsourakos, S.; Nindos, A.

The primary constraining force that inhibits global solar eruptions is provided by the overlying background magnetic field. Using magnetic field data from both the Helioseismic and Magnetic Imager aboard the Solar Dynamics Observatory and the spectropolarimeter of the Solar Optical Telescope aboard Hinode, we study the long-term evolution of the b…

2012 • The Astrophysical Journal

Hinode 50

Comet-like mineralogy of olivine crystals in an extrasolar proto-Kuiper belt

DOI: 10.1038/nature11469 Bibcode: 2012Natur.490...74D

Waters, L. B. F. M.; Ivison, R. J.; Blommaert, J. A. D. L. +20 more

Some planetary systems harbour debris disks containing planetesimals such as asteroids and comets. Collisions between such bodies produce small dust particles, the spectral features of which reveal their composition and, hence, that of their parent bodies. A measurement of the composition of olivine crystals (Mg_2-2xFe_2xSiO

2012 • Nature

Herschel 50

Chemical and Kinematical Properties of Blue Straggler Stars and Horizontal Branch Stars in NGC 6397

DOI: 10.1088/0004-637X/754/2/91 Bibcode: 2012ApJ...754...91L

Dalessandro, E.; Contreras Ramos, R.; Mucciarelli, A. +4 more

We used three sets of high-resolution spectra acquired with the multifiber facility FLAMES at the Very Large Telescope of the European Southern Observatory to investigate the chemical and kinematical properties of a sample of 42 horizontal branch (HB) stars, 18 blue straggler stars (BSSs), and 86 main-sequence (MS) turnoff (TO) and sub-giant branc…

2012 • The Astrophysical Journal

eHST 50

Reconnection at the magnetopause of Saturn: Perspective from FTE occurrence and magnetosphere size

DOI: 10.1029/2011JA017263 Bibcode: 2012JGRA..117.5222L

Lai, H. R.; Russell, C. T.; Wei, H. Y. +2 more

Flux transfer events observed at Mercury, Earth, and Jupiter are attributed to spatially and temporally limited events in which the magnetosheath and magnetospheric magnetic field become interconnected and magnetic flux is transported from the dayside to the lobes of the magnetotail. Examination of the Saturnian magnetopause at local times from 10…

2012 • Journal of Geophysical Research (Space Physics)

Cassini 50

Further Evidence for Large Central Mass-to-light Ratios in Early-type Galaxies: The Case of Ellipticals and Lenticulars in the A262 Cluster

DOI: 10.1088/0004-6256/144/3/78 Bibcode: 2012AJ....144...78W

Saglia, R. P.; Thomas, J.; Bender, R. +3 more

We present new radially resolved spectroscopy of eight early-type galaxies in the A262 cluster. The measurements include stellar rotation, velocity dispersion, H ₃ and H ₄ coefficients of the line-of-sight velocity distribution along the major and minor axes and an intermediate axis as well as line-strength index profiles of …

2012 • The Astronomical Journal

eHST 50

Bursty escape fluxes in plasma sheets of Mars and Venus

DOI: 10.1029/2011GL049883 Bibcode: 2012GeoRL..39.1104D

Fedorov, A.; Barabash, S.; Lundin, R. +5 more

High resolution measurements of plasma in the plasma sheets of Mars and Venus performed by almost identical plasma instruments ASPERA-3 on the Mars Express spacecraft and ASPERA-4 on Venus Express reveal similar features of bursty fluxes of escaping planetary ions. A period of bursts lasts about 1-2 min. Simultaneous magnetic field measurements on…

2012 • Geophysical Research Letters

MEx VenusExpress 50

The hard X-ray emission of X Persei

DOI: 10.1051/0004-6361/201218878 Bibcode: 2012A&A...540L...1D

Santangelo, A.; Doroshenko, V.; Kreykenbohm, I. +1 more

We present an analysis of the spectral properties of the peculiar X-ray pulsar X Per based on INTEGRAL observations. We show that the source exhibits an unusually hard spectrum and is confidently detected by ISGRI up to more than 100 keV. We find that two distinct components may be identified in the broadband 4-200 keV spectrum …

2012 • Astronomy and Astrophysics

INTEGRAL 50

CHEERS Results on Mrk 573: A Study of Deep Chandra Observations

DOI: 10.1088/0004-637X/756/1/39 Bibcode: 2012ApJ...756...39P

Elvis, Martin; Karovska, Margarita; Fabbiano, Giuseppina +2 more

We present results on Mrk 573 obtained as part of the CHandra survey of Extended Emission-line Regions in nearby Seyfert galaxies (CHEERS). Previous studies showed that this source features a biconical emission in the soft X-ray band closely related to the narrow-line region as mapped by the [O III] emission line and the radio emission, though on …

2012 • The Astrophysical Journal

eHST 49

Boulders on Lutetia

DOI: 10.1016/j.pss.2011.11.004 Bibcode: 2012P&SS...66...71K

Lara, L. M.; Bertaux, J. -L.; Lamy, P. +37 more

More than 200 boulders are among the many prominent geological features seen on Lutetia by the OSIRIS cameras onboard Rosetta. Most are concentrated around the central crater in Baetica regio with a few more apparently associated with Patavium crater. The size range of boulders visible to OSIRIS is about 60-300 m. We model the trajectories of boul…

2012 • Planetary and Space Science

Rosetta 49