Search Publications
X-rays from Green Pea analogues
Kaaret, P.; Brorby, M.
X-ray observations of two metal-deficient luminous compact galaxies (LCG; SHOC 486 and SDSS J084220.94+115000.2) with properties similar to the so-called Green Pea galaxies were obtained using the Chandra X-ray Observatory. Green Pea galaxies are relatively small, compact (a few kpc across) galaxies that get their green colour from strong [O III] …
Stability of the interstellar hydrogen inflow longitude from 20 years of SOHO/SWAN observations
Schmidt, W.; Bertaux, J. -L.; Lallement, R. +3 more
Aims: A recent debate on the decade-long stability of the interstellar He flow vector, and in particular the flow longitude, has prompted us to check for any variability in the interstellar H flow vector as observed by the SWAN instrument on board SOHO.
Methods: We used a simple model-independent method to determine the interstellar H fl…
Quantification of the total ion transport in the near-Earth plasma sheet
Karlsson, Tomas; Nilsson, Hans; Slapak, Rikard +4 more
Recent studies strongly suggest that a majority of the observed O+ cusp outflows will eventually escape into the solar wind, rather than be transported to the plasma sheet. Therefore, an investigation of plasma sheet flows will add to these studies and give a more complete picture of magnetospheric ion dynamics. Specifically, it will pr…
Optimal Stellar Photometry for Multi-conjugate Adaptive Optics Systems Using Science-based Metrics
Massari, D.; Stetson, P. B.; Bono, G. +5 more
We present a detailed discussion of how to obtain precise stellar photometry in crowded fields using images from multi-conjugate adaptive optics (MCAO) systems, with the intent of informing the scientific development of this key technology for the Extremely Large Telescopes. We use deep J and K s exposures of NGC 1851 taken with the Gem…
XMM-Newton observation of the supernova remnant Kes 78 (G32.8-0.1): Evidence of shock-cloud interaction
Chen, Y.; Miceli, M.; Bocchino, F. +4 more
Context. The Galactic supernova remnant Kes 78 is surrounded by dense molecular clouds, whose projected position overlaps with the extended HESS γ-ray source HESS J1852-000. The X-ray emission from the remnant has recently been revealed by Suzaku observations, which have shown indications for a hard X-ray component in the spectra that might be ass…
Search for active lava flows with VIRTIS on Venus Express
Drossart, P.; Piccioni, G.; Smrekar, S. +3 more
The Visible Infrared Thermal Imaging Spectrometer (VIRTIS) instrument on Venus Express observed thermal emission from the surface of Venus at 1 µm wavelength and thus would have detected sufficiently bright incandescent lava flows. No eruptions were detected in the observations between April 2006 and October 2008, covering an area equivalent…
Impact-generated winds on Mars
Schultz, Peter H.; Quintana, Stephanie N.
Bright and dark wind streaks across Mars record wind patterns related to atmospheric circulation. In some cases these streaks represent erosion of a surface veneer; in others, they indicate sand grains mobilized by strong vortices shed off of positive relief, such as crater rims. While many streaks change length or orientation over time, others no…
Spatially resolved analysis of superluminous supernovae PTF 11hrq and PTF 12dam host galaxies
Perley, Daniel A.; Lunnan, Ragnhild; Kim, Sam +12 more
Superluminous supernovae (SLSNe) are the most luminous supernovae in the Universe. They are found in extreme star-forming galaxies and are probably connected with the death of massive stars. One hallmark of very massive progenitors would be a tendency to explode in very dense, UV-bright and blue regions. In this paper, we investigate the resolved …
Coronal mass ejections and solar wind mass fluxes over the heliosphere during solar cycles 23 and 24 (1996-2014)
Lamy, P.; Quémerais, E.; Floyd, O. +2 more
Coronal mass ejections (CMEs) play a major role in the heliosphere, and their contribution to the solar wind mass flux, already considered in the Skylab and Solwind eras with conflicting results, is reexamined in the light of 19 years (1996-2014) of SOHO observations with the Large Angle and Spectroscopic Coronagraph (LASCO-C2) for the CMEs and ex…
The Gaia Data Release 1 parallaxes and the distance scale of Galactic planetary nebulae
Stanghellini, Letizia; Bucciarelli, Beatrice; Lattanzi, Mario G. +1 more
In this paper we gauge the potentiality of Gaia in the distance scale calibration of planetary nebulae (PNe) by assessing the impact of DR1 parallaxes of central stars of Galactic PNe (CSPNe) against known physical relations. For selected PNe targets with state-of-the-art data on angular sizes and fluxes, we derive the distance-dependent parameter…