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Variation in Coronal Activity from Solar Cycle 24 Minimum to Maximum Using Three-Dimensional Reconstructions of the Coronal Electron Density from STEREO/COR1
Thompson, William T.; Davila, Joseph M.; Wang, Tongjiang +2 more
Three-dimensional electron density distributions in the solar corona are reconstructed for 100 Carrington rotations (CR 2054 - 2153) during 2007/03 - 2014/08 using the spherically symmetric method from polarized white-light observations with the inner coronagraph (COR1) onboard the twin Solar Terrestrial Relations Observatory (STEREO). These three…
ALMA high spatial resolution observations of the dense molecular region of NGC 6302
Sánchez Contreras, C.; Alcolea, J.; Corradi, R. L. M. +5 more
Context. The mechanism behind the shaping of bipolar planetary nebulae is still poorly understood. It is becoming increasingly clear that the main agents must operate at their innermost regions, where a significant equatorial density enhancement should be present and related to the collimation of light and jet launching from the central star prefe…
A comparison between the soft X-ray and [O III] morphologies of active galactic nuclei
Gallego, Jesús; Gómez-Guijarro, Carlos; Rodríguez-Espinosa, José Miguel +2 more
Several studies of nearby active galactic nuclei (AGNs) have shown that the soft X-ray emission presents a size and morphology resembling that of the narrow-line region (NLR) traced by [O III]. Since the NLR is mainly constituted by gas photoionized by the AGN, it seems logical to assume that this is also the primary source of the soft X-ray emiss…
The Proper Motion of Pyxis: The First Use of Adaptive Optics in Tandem with HST on a Faint Halo Object
Neichel, B.; Linden, S. T.; Davies, R. +13 more
We present a proper motion measurement for the halo globular cluster Pyxis, using Hubble Space Telescope/ACS data as the first epoch and GeMS/GSAOI Adaptive Optics data as the second, separated by a baseline of ∼5 years. This is both the first measurement of the proper motion of Pyxis and the first calibration and use of Multi-Conjugate Adaptive O…
Visualization of Multi-mission Astronomical Data with ESASky
de Marchi, Guido; Merín, Bruno; O'Mullane, William +17 more
ESASky is a science-driven discovery portal to explore the multi-wavelength sky and visualize and access multiple astronomical archive holdings. The tool is a web application that requires no prior knowledge of any of the missions involved and gives users world-wide simplified access to the highest-level science data products from multiple astrono…
Constraining scalar-Gauss-Bonnet inflation by reheating, unitarity, and Planck data
Bhattacharjee, Srijit; Maity, Debaprasad; Mukherjee, Rupak
We revisit the inflationary dynamics in detail for theories with Gauss-Bonnet gravity coupled to scalar functions, in light of the Planck data. Considering the chaotic inflationary scenario, we constrain the parameters of two models involving inflaton-Gauss-Bonnet coupling by current Planck data. For nonzero inflaton-Gauss-Bonnet coupling β , an i…
Population mixtures and searches of lensed and extended quasars across photometric surveys
Treu, Tommaso; Agnello, Adriano; Williams, Peter
Wide-field photometric surveys enable searches of rare yet interesting objects, such as strongly lensed quasars or quasars with a bright host galaxy. Past searches for lensed quasars based on their optical and near-infrared properties have relied on photometric cuts and spectroscopic preselection (as in the Sloan Quasar Lens Search), or neural net…
Interaction of Two Filaments in a Long Filament Channel Associated with Twin Coronal Mass Ejections
Chen, Yao; Zheng, Ruisheng; Wang, Bing +4 more
Using the high-quality observations of the Solar Dynamics Observatory, we present the interaction of two filaments (F1 and F2) in a long filament channel associated with twin coronal mass ejections (CMEs) on 2016 January 26. Before the eruption, a sequence of rapid cancellation and emergence of the magnetic flux has been observed, which likely tri…
Interplanetary Coronal Mass Ejections Resulting from Earth-Directed CMEs Using SOHO and ACE Combined Data During Solar Cycle 23
Paouris, Evangelos; Mavromichalaki, Helen
In this work a total of 266 interplanetary coronal mass ejections observed by the Solar and Heliospheric Observatory/Large Angle and Spectrometric Coronagraph (SOHO/LASCO) and then studied by in situ observations from Advanced Composition Explorer (ACE) spacecraft, are presented in a new catalog for the time interval 1996 - 2009 covering Solar Cyc…
The Slowest Spinning X-Ray Pulsar in an Extragalactic Globular Cluster
Sartore, Nicola; Bachetti, Matteo; Webb, Natalie A. +2 more
Neutron stars are thought to be born rapidly rotating and then exhibit a phase of rotation-powered pulsations as they slow down to 1-10 s periods. The significant population of millisecond pulsars observed in our Galaxy is explained by the recycling concept: during an epoch of accretion from a donor star in a binary system, the neutron star is spu…