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The flapping motion of the Venusian magnetotail: Venus Express observations
Barabash, S.; Futaana, Y.; Wei, Y. +7 more
With a newly developed technique and magnetic field measurements obtained by the magnetometer on Venus Express, we study the flapping motion of the Venusian magnetotail. We find that the flapping motion generally comprises contributions both from a nonpropagating steady flapping and a propagating kink-like flapping. The flapping motion tilts the c…
Light Echoes from Supernova 2014J in M82
Crotts, Arlin P. S.
Type Ia SN 2014J exploded in the nearby starburst galaxy M82 = NGC 3032 and was discovered at Earth about seven days later on 2014 January 21, reaching maximum light in V around 2014 February 5. SN 2014J is the closest SN Ia in at least four decades and probably many more. Recent Hubble Space Telescope/WFC3 imaging (2014 September 5 and 2015 Febru…
On the Fe K absorption - accretion state connection in the Galactic Centre neutron star X-ray binary AX J1745.6-2901
Nandra, K.; Degenaar, N.; Bianchi, S. +17 more
AX J1745.6-2901 is a high-inclination (eclipsing) neutron star low-mass X-ray binary (LMXB) located less than ∼1.5 arcmin from Sgr A⋆. Ongoing monitoring campaigns have targeted Sgr A⋆ frequently and these observations also cover AX J1745.6-2901. We present here an X-ray analysis of AX J1745.6-2901 using a large data set of 3…
Radial Evolution of a Magnetic Cloud: MESSENGER, STEREO, and Venus Express Observations
Forsyth, R. J.; Zurbuchen, T. H.; Raines, J. M. +3 more
The Solar Orbiter and Solar Probe Plus missions will provide observations of magnetic clouds closer to the Sun than ever before, and it will be good preparation for these missions to make full use of the most recent in situ data sets from the inner heliosphere—namely, those provided by MErcury Surface, Space ENvironment, GEochemistry, and Ranging …
Evolution of the plasma environment of comet 67P from spacecraft potential measurements by the Rosetta Langmuir probe instrument
André, M.; Carr, C.; Edberg, N. J. T. +6 more
We study the evolution of the plasma environment of comet 67P using measurements of the spacecraft potential from early September 2014 (heliocentric distance 3.5 AU) to late March 2015 (2.1 AU) obtained by the Langmuir probe instrument. The low collision rate keeps the electron temperature high (∼5 eV), resulting in a negative spacecraft potential…
Does the obscured AGN fraction really depend on luminosity?
Krivonos, R.; Sazonov, S.; Churazov, E.
We use a sample of 151 local non-blazar active galactic nuclei (AGN) selected from the INTEGRAL all-sky hard X-ray survey to investigate if the observed declining trend of the fraction of obscured (i.e. showing X-ray absorption) AGN with increasing luminosity is mostly an intrinsic or selection effect. Using a torus-obscuration model, we demonstra…
Measuring star formation with resolved observations: the test case of M 33
Buat, V.; Boquien, M.; Braine, J. +15 more
Context. Measuring star formation on a local scale is important to constrain star formation laws. It is not clear yet, however, whether and how the measure of star formation is affected by the spatial scale at which a galaxy is observed.
Aims: We wish to understand the impact of the resolution on the determination of the spatially resolved st…
Herschel Survey of the Palomar-Green QSOs at Low Redshift
Ho, Luis C.; Scoville, Nicholas Z.; Petric, Andreea O. +1 more
We investigate the global cold dust properties of 85 nearby (z≤slant 0.5) QSOs, chosen from the Palomar-Green sample of optically luminous quasars. We determine their infrared spectral energy distributions and estimate their rest-frame luminosities by combining Herschel data from 70 to 500 µm with near-infrared and mid-infrared measurements …
Concurrent observations of ultraviolet aurora and energetic electron precipitation with Mars Express
Lundin, R.; Bertaux, J. -L.; Gérard, J. -C. +4 more
The database of the Spectroscopy for the Investigation of the Characteristics of the Atmosphere of Mars (SPICAM) instrument between late January 2004 and Mars 2014 has been searched to identify signatures of CO Cameron and CO2+ doublet ultraviolet auroral emissions. This study has almost doubled the number of auroral detectio…
An Optically Obscured AGN in a Low Mass, Irregular Dwarf Galaxy: A Multi-Wavelength Analysis of J1329+3234
Secrest, N. J.; Fischer, J.; Satyapal, S. +6 more
Supermassive black holes (SMBHs) are found ubiquitously in large, bulge-dominated galaxies throughout the local universe, yet little is known about their presence and properties in bulgeless and low-mass galaxies. This is a significant deficiency, since the mass distribution and occupation fraction of nonstellar black holes provide important obser…