Search Publications
Large Binocular Telescope observations of PSR J2043+2740*
Marelli, M.; Rea, N.; Mignani, R. P. +5 more
We present the results of deep optical imaging of the radio/γ-ray pulsar PSR J2043+2740, obtained with the Large Binocular Telescope (LBT). With a characteristic age of 1.2 Myr, PSR J2043+2740 is one of the oldest (non-recycled) pulsars detected in γ-rays, although with still a quite high rotational energy reservoir (\dot{E}_rot = 5.6 × 10^{34} er…
Ultraviolet Flux Decrease Under a Grand Minimum from IUE Short-wavelength Observation of Solar Analogs
Melis, Carl; Tytler, David; Lubin, Dan
We have identified a sample of 33 Sun-like stars observed by the International Ultraviolet Explorer (IUE) with the short-wavelength spectrographs that have ground-based detections of chromospheric Ca II H+K activity. Our objective is to determine if these observations can provide an estimate of the decrease in ultraviolet (UV) surface flux associa…
Superpenumbral chromospheric flare
Srivastava, Abhishek K.; Liu, Suo; Zhang, Hong-Qi +2 more
We observed a C-class flare at the outer boundary of the superpenumbra of a sunspot. The flare was triggered by an emerging magnetic bipolar region that was obliquely oriented with respect to the superpenumbral fibrils. The flare started due to the low height magnetic reconnection of emerging magnetic flux with a superpenumbral field resulting in …
AMI-CL J0300+2613: a Galactic anomalous-microwave-emission ring masquerading as a galaxy cluster
Feroz, Farhan; Grainge, Keith J. B.; Hobson, Michael P. +17 more
The Arcminute Microkelvin Imager (AMI) carried out a blind survey for galaxy clusters via their Sunyaev-Zel'dovich effect decrements between 2008 and 2011. The first detection, known as AMI-CL J0300+2613, has been reobserved with AMI equipped with a new digital correlator with high dynamic range. The combination of the new AMI data and more recent…
Spatially Extended Low-ionization Emission Regions (LIERs) at z ∼ 0.9
Marchesini, Danilo; Momcheva, Ivelina G.; Brammer, Gabriel B. +9 more
We present spatially resolved emission diagnostics for eight z ∼ 0.9 galaxies that demonstrate extended low-ionization emission line regions over kpc scales. Eight candidates are selected based on their spatial extent and emission line fluxes from slitless spectroscopic observations with the Hubble Space Telescope/Wide Field Camera 3 G141 and G800…
J0453-6655, the Supernova Remnant in N4D
Points, S. D.; Murray, S. S.; Smith, R. K. +4 more
The Large Magellanic Cloud supernova remnant J0453-6655 in the H II region N4 has been observed with XMM-Newton and with Chandra. Almost all of the diffuse X-ray emission is from within a 3.‧5 × 2.‧3 region of bright optical filaments, and X-ray results from XMM-Newton and Chandra are very similar. Spectra indicate that the plasma is close to equi…
MICROSCOPE mission: drag-free and attitude control system expertise activities toward the scientific team
Robert, Alain; Guidotti, Pierre-Yves; Prieur, Pascal +2 more
Microscope is a CNES-ESA-ONERA-CNRS-OCA-DLR-ZARM mission dedicated to the test of the Equivalence Principle with an improved accuracy of 10-15. The 300 kg drag-free microsatellite was launched on April 25th 2016 into a 710 km dawndusk sun-synchronous orbit for a 2-year mission. To comply with stringent requirements, the drag-free and at…
A Binary Nature of the Marginal CP Star Sigma Sculptoris
Krtička, Jiří; Paunzen, Ernst; Adam, Christian +7 more
The A2 V star σ Scl was suspected of being a low-amplitude rotating variable of the Ap-type star by several authors. Aiming to decide whether the star is a variable chemically peculiar (CP) star, we searched for the photometric and spectroscopic variability, and determined chemical abundances of σ Scl. The possible variability was tested using sev…
Spectroscopy of the Eclipsing Binary BD-00°2862. Possible Multiplicity
Kamiński, K.; Dimitrov, W.; Polińska, M. +2 more
We present the first spectroscopic analysis of the eclipsing binary BD-00°2862. The All Sky Automated Survey light curves yield orbital period of the system of 2.15 d. The shape of the light curve reveals that the components are almost spherical and the binary is detached. The eclipses depths show significant difference of the components' temperat…
Analysis of unresolved photospheric magnetic field structure using Fe I 6301 and 6302 lines
Lozitsky, V. G.; Browning, P. K.; Gordovskyy, M. +1 more
Context.Early magnetographic observations indicated that the magnetic field in the solar photosphere has an unresolved small-scale structure. Near-infrared and optical data with extremely high spatial resolution show that these structures have scales of a few tens of kilometres, which are not resolved in the majority of solar observations. Aims.Th…