Search Publications
Missions
Journals
Publication Years
Possible Electromagnetic Manifestations of Merging Black Holes
Bisikalo, D. V.; Zhilkin, A. G.; Kurbatov, E. P.
The scenario of a merger of two black holes surrounded by an accretion disk is considered. As a result of the emission of gravitational waves, the mass of the central object decreases, and the accretion disk is perturbed. Computational results show that the main consequence of this perturbation is the formation of a shock propagating from the cent…
A Carbon-rich Hot Bubble in the Planetary Nebula NGC 5189
Karovska, Margarita; Toalá, Jesús A.; Montez, Rodolfo, Jr.
We present the discovery of extended X-ray emission from the planetary nebula (PN) NGC 5189 around the [WO1]-type WD 1330-657 with XMM-Newton. The X-ray-emitting gas fills the cavities detected in the Hubble Space Telescope [O III] narrowband image and presents a limb-brightened morphology toward the outer edges of the east and west lobes. The bul…
Radio-optical galaxy shape and shear correlations in the COSMOS field using 3 GHz VLA observations
Brown, Michael L.; Harrison, Ian; Hillier, Tom +1 more
We present a weak-lensing analysis of the 3 GHz Very Large Array radio survey of the COSMOS field, which we correlate with overlapping Hubble Space Telescope-Advanced Camera for Survey optical observations using both intrinsic galaxy shape and cosmic shear correlation statistics. After cross-matching sources between the two catalogues, we measure …
Microquasar V404 Cyg /GS 2023+338: MASTER optical observations during the June and December 2015 super-outbursts
Rebolo, R.; Wang, X.; Buckley, D. A. H. +22 more
We present several thousands homogeneous photometric (WBVRI and polarization) observations of the microquasar black hole binary V404 Cyg, obtained by the MASTER Global Robotic Network (Lipunov et al. 2010). MASTER were the first telescopes to optically monitor the microquasar after its gamma-ray onset from 18 h 34 m 09 s UT on June 15, 2015 (), un…
Testing Seismic Models of Hot B Subdwarfs with Gaia Data
Latour, M.; Green, E. M.; Fontaine, G. +5 more
We report the results of a study designed to test further the basic validity of the seismic models of hot pulsating B subdwarfs that have been developed over the last two decades. Given estimates of the effective temperature, surface gravity, and mass as obtained from a seismic analysis, and given an estimate of the He/H ratio as available from in…
The Central Star of NGC 2346 as a Clue to Binary Evolution through the Common Envelope Phase
Bianchi, L.; Manteiga, M.; Gómez-Muñoz, M. A. +2 more
We present an analysis of the binary central star of the planetary nebula NGC 2346 based on archival data from the International Ultraviolet Explorer, and new low- and high-resolution optical spectra (3700-7300 Å). By including in the spectral analysis the contribution of both stellar and nebular continuum, we reconciled long-time discrepant UV an…
Search for Evolutionary Changes in the Periods of Cepheids: V1033 Cyg, a Classical Cepheid at the First Crossing of the Instability Strip
Lemasle, B.; Berdnikov, L. N.; Kniazev, A. Yu. +9 more
For the classical Cepheid V1033 Cyg we have constructed an O—C diagram spanning a time interval of 117 years. The O—C diagram has the shape of a parabola, which has made it possible to determine for the first time the quadratic light elements and to calculate the rate of evolutionary increase in the period dP/dt = 18.19 (±0.08) syr-1, i…
A slowly expanding torus associated with the candidate LBV MGE 042.0787+00.5084
Bordiu, Cristobal; Rizzo, J. Ricardo; Ritacco, Alessia
The luminous blue variable (LBV) phase is a poorly understood stage in the evolution of high-mass stars, characterized by its brevity and instability. The surroundings of LBV stars are excellent test beds to study their dense stellar winds and eruptive mass-loss events. Aiming to improve our knowledge of the LBV phase, we observed the J = 1 → 0 an…
Kelvin-Helmholtz Waves Magnetic Curvature and Vorticity: Four-Spacecraft Cluster Observations
Kieokaew, Rungployphan; Foullon, Claire
[1] Magnetopause Kelvin-Helmholtz (KH) waves are rich in complex magnetic and flow structures which are key to understand the role of these waves in facilitating the solar wind plasma transport into the Earth's magnetosphere. Four spacecraft in tetrahedral configuration provide the tools necessary for characterizing in situ magnetic geometry and v…
Variables in the Southern Polar Region Evryscope 2016 Data Set
Trifonov, Trifon; Law, Nicholas M.; Fors, Octavi +6 more
The regions around the celestial poles offer the ability to find and characterize long-term variables from ground-based observatories. We used multi-year Evryscope data to search for high-amplitude (≈5% or greater) variable objects among 160,000 bright stars (mv < 14.5) near the South Celestial Pole. We developed a machine-learning-b…