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The Spindle: An Irradiated Disk and Bent Protostellar Jet in Orion
Ginsburg, Adam; Youngblood, Allison; Bally, John
We present Hubble Space Telescope observations of a bent, pulsed Herbig-Haro jet, HH 1064, emerging from the young star Parenago 2042 embedded in the H II region NGC 1977 located about 30' north of the Orion Nebula. This outflow contains eight bow shocks in the redshifted western lobe and five bow shocks in the blueshifted eastern lobe. Shocks wit…
Abell 1201: A Minor Merger at Second Core Passage
McNamara, Brian R.; Nulsen, Paul E. J.; Murray, Stephen S. +3 more
We present an analysis of the structures and dynamics of the merging cluster Abell 1201, which has two sloshing cold fronts around a cooling core, and an offset gas core approximately 500 kpc northwest of the center. New Chandra and XMM-Newton data reveal a region of enhanced brightness east of the offset core, with breaks in surface brightness al…
Upper limit for the D2H+ ortho-to-para ratio in the prestellar core 16293E (CHESS)
Codella, C.; Ceccarelli, C.; Lis, D. C. +6 more
The H_3^+ ion plays a key role in the chemistry of dense interstellar gas clouds where stars and planets are forming. The low temperatures and high extinctions of such clouds make direct observations of H_3^+ impossible, but lead to large abundances of H2D+ and D2H+, which are very useful probes of the e…
Late-stage impacts and the orbital and thermal evolution of Tethys
Zhang, Ke; Nimmo, Francis
An inferred ancient episode of heating and deformation on Tethys has been attributed to its passage through a 3:2 resonance with Dione (Chen, E.M.A., Nimmo, F. [2008]. Geophys. Res. Lett. 35, 19203). The satellites encounter, and are trapped into, the e-Dione resonance before reaching the e-Tethys resonance, limiting the degree to which Tethys is …
Orbit determination of close binary systems using lucky imaging
Rica, F. M.; Barrena, R.; Vázquez, G. +2 more
We present relative positions of visual binaries observed in 2009 with the FastCam 'lucky-imaging' camera mounted on the 1.5-m Carlos Sánchez Telescope at the Observatorio del Teide. We obtained 424 CCD observations (averaged in 198 mean relative positions) of 157 binaries with angular separations in the range 0.14-15.40 arcsec, with a median sepa…
The high-energy environment in the super-Earth system CoRoT-7
Schmitt, J. H. M. M.; Czesla, S.; Lalitha, S. +3 more
High-energy irradiation of exoplanets has been identified to be a key influence on the stability of these planets' atmospheres. So far, irradiation-driven mass-loss has been observed only in two Hot Jupiters, and the observational data remain even more sparse in the super-Earth regime. We present an investigation of the high-energy emission in the…
Searching for the orbital period of the ultraluminous X-ray source NGC 1313 X-2
Falomo, R.; Soria, R.; Zampieri, L. +2 more
We analysed the longest phase-connected photometric data set available for NGC 1313 X-2, looking for the ∼6-day modulation reported by Liu et al.. The folded B-band light curve shows a ∼6-day periodicity with a significance slightly larger than 3σ. The low statistical significance of this modulation, along with the lack of detection in the V band,…
X-ray follow-up observations of the two γ-ray pulsars PSR J1459-6053 and PSR J1614-2230
Hill, A. B.; Guillemot, L.; Rea, N. +6 more
Aims: We have observed two newly detected γ-ray pulsars, PSR J1459-6053 and PSR J1614-2230, in the X-ray domain with XMM-Newton to try to enlarge the sample of pulsars for which multi-wavelength data exist. We use these data with the aim of understanding the pulsar emission mechanisms of these pulsars.
Methods: We analysed the X-ray spec…
Re-examining the XMM-Newton spectrum of the black hole candidate XTE J1652-453
Fabian, A. C.; Reis, R. C.; Walton, D. J. +1 more
The XMM-Newton spectrum of the black hole candidate XTE J1652-453 shows a broad and strong Fe Kα emission line, generally believed to originate from reflection of the inner accretion disc. These data have been analysed by Hiemstra et al. using a variety of phenomenological models. We re-examine the spectrum with a self-consistent relativistic refl…
Magnetic Helicity Transported by Flux Emergence and Shuffling Motions in Solar Active Region NOAA 10930
Zhang, Y.; Takizawa, K.; Kitai, R.
We present a new methodology which can determine magnetic helicity transport by the passage of helical magnetic field lines from the sub-photosphere and the shuffling motions of footpoints of preexisting coronal field lines separately. It is well known that only the velocity component, which is perpendicular to the magnetic field (υ B )…