Search Publications
Quasi-simultaneous INTEGRAL, SWIFT, and NuSTAR Observations of the New X-Ray Clocked Burster 1RXS J180408.9-342058
Fiocchi, M.; Ubertini, P.; Bazzano, A. +4 more
We report the quasi-simultaneous INTEGRAL, SWIFT, and NuSTAR observations showing spectral state transitions in the neutron star low-mass X-ray binary 1RXS J180408.9-342058 during its 2015 outburst. We present results of the analysis of high-quality broad energy band (0.8-200 keV) data in three different spectral states: high/soft, low/very-hard, …
A Supernova Remnant Counterpart for HESS J1832-085
Haberl, F.; Filipović, M. D.; Pühlhofer, G. +18 more
We examine the new Galactic supernova remnant (SNR) candidate, G23.11+0.18, as seen by the Murchison Widefield Array radio telescope. We describe the morphology of the candidate and find a spectral index of -0.63 ± 0.05 in the 70-170 MHz domain. Coincident TeV gamma-ray detection in High Energy Stereoscopic System (HESS) data supports the SNR natu…
A New Einstein Cross Gravitational Lens of a Lyman-break Galaxy
Corradi, Romano L. M.; Vulcani, Benedetta; Negrello, Mattia +5 more
We report the study of an “Einstein Cross” configuration first identified in a set of HST images by Cerny et al. Deep spectroscopic observations obtained at the Spanish 10.4 m Gran Telescopio Canarias telescope, allowed us to demonstrate the lens nature of the system, that consists of a Lyman-break galaxy (LBG), not a quasi-stellar object as is us…
Discovery of an Outbursting 12.8 Minute Ultracompact X-Ray Binary
Udalski, Andrzej; Mróz, Przemek; Skowron, Jan +2 more
We report the discovery of OGLE-UCXB-01, a 12.8 minute variable object located in the central field of Galactic bulge globular cluster Djorg 2. The presence of frequent, short-duration brightenings at such an ultrashort period in long-term OGLE photometry together with the blue color of the object in Hubble Space Telescope images and the detection…
Determination of Plasma, Pickup Ion, and Suprathermal Particle Spectrum in the Solar Wind Frame of Reference
Wimmer-Schweingruber, R. F.; Pogorelov, N. V.; von Steiger, R. +4 more
Particle spectra directly measured by a plasma or low-energy particle experiment on spacecraft often contain instrumental effects due to a limited field of view or angular resolution. It is because the particle distribution function at low energies is highly anisotropic in the spacecraft frame of reference, in which the measurements are made. In t…
Multiwavelength Stereoscopic Observation of the 2013 May 1 Solar Flare and CME
Krucker, Säm; Masuda, Satoshi; Mitrofanov, Igor +7 more
A M-class behind-the-limb solar flare on 2013 May 1 (SOL2013-05-01T02:32), accompanied by a (∼400 km s-1) coronal mass ejection (CME), was observed by several space-based observatories with different viewing angles. We investigated the RHESSI-observed occulted hard X-ray (HXR) emissions that originated at least 0.1 {R}{{S}} a…
Evolution of the Three-dimensional Shape of Passively Evolving and Star-forming Galaxies at z < 1
Kajisawa, Masaru; Satoh, Yuki K.; Himoto, Kazuharu G.
Using the HST/ACS I F814W-band data, we investigated the distribution of apparent axial ratios of ∼21,000 galaxies with M V < -20 at 0.2 < z < 1.0 in the COSMOS field as a function of stellar mass, specific star formation rate (sSFR), and redshift. We statistically estimated intrinsic 3D shapes of these galaxies by…
Chromospheric Peculiar Off-limb Dynamical Events from IRIS Observations
Koutchmy, S.; Tavabi, E.
To study motions and oscillations in the solar chromosphere and at the transition region level we analyze some extreme Doppler shifts observed off-limb with the Interface Region Imaging Spectrograph (IRIS). Raster scans and slit-jaw imaging observations performed in the near-ultraviolet channels were used. Large transverse oscillations are reveale…
Limits on the Electromagnetic Counterpart of Binary Black Hole Coalescence at Visible Wavelengths
Turpin, Damien; Laugier, Romain; Noysena, Kanthanakorn +4 more
We used the Télescope à Action Rapide pour les Objets Transitoires network of telescopes to search for the electromagnetic counterparts of GW150914, GW170104, and GW170814, which were reported to originate from binary black hole merger events by the Laser Interferometer Gravitational-wave Observatory and Virgo collaborations. Our goal is to constr…
The K2 Light Curves and Stunted Outbursts of AC Cnc
Schlegel, E. M.; Honeycutt, R. K.
We describe two observations of the nova-like cataclysmic variable AC Cnc obtained with Kepler during its revamped second mission (K2). Using the K2 1 minute cadence mode, the data were obtained during campaigns 5 and 18. Campaign 5 (C05) lasted from ∼2015 April 27 to ∼2015 July 10, a total of 74.8 days, and yielded ∼106,000 measurements. Campaign…