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An Imaging Study of a Complex Solar Coronal Radio Eruption
Feng, S. W.; Chen, Y.; Song, H. Q. +2 more
Solar coronal radio bursts are enhanced radio emission excited by energetic electrons accelerated during solar eruptions. Studying these bursts is important for investigating the origin and physical mechanism of energetic particles and further diagnosing coronal parameters. Earlier studies suffered from a lack of simultaneous high-quality imaging …
Evidence of Energy Supply by Active-Region Spicules to the Solar Atmosphere
Ahangarzadeh Maralani, A. R.; Tavabi, E.; Ajabshirizadeh, A. +1 more
We investigate the role of active-region spicules in the mass balance of the solar wind and energy supply in heating the solar atmosphere. We use high-cadence observations from the Solar Optical Telescope (SOT) onboard the Hinode satellite in the Ca II H-line filter obtained on 26 January 2007. The observational technique provides the high spatio-…
Far-UV Emission Properties of FR1 Radio Galaxies
Danforth, Charles W.; France, Kevin; Stocke, John T. +2 more
The power mechanism and accretion geometry for low-power FR 1 radio galaxies are poorly understood in comparison to those for Seyfert galaxies and QSOs. In this paper, we use the diagnostic power of the Lyα recombination line observed using the Cosmic Origins Spectrograph (COS) aboard the Hubble Space Telescope (HST) to investigate the accretion f…
Limits on entanglement effects in the string landscape from Planck and BICEP/Keck data
Kinney, William H.
We consider observational limits on a proposed model of the string landscape in inflation. In this scenario, effects from the decoherence of entangled quantum states in long-wavelength modes in the universe result in modifications to the Friedmann Equation and a corresponding modification to inflationary dynamics. Previous work [1, 2] suggested th…
Magnetotail magnetic flux monitoring based on simultaneous solar wind and magnetotail observations
Gordeev, E. I.; Sergeev, V. A.; Milan, S. E. +3 more
The magnetotail magnetic flux (MTF) is an important global variable to describe the magnetospheric state and dynamics. Existing methods of MTF estimation on the basis of the polar cap area, inferred from observations of global auroras and field-aligned currents, do not allow benchmarking due to the absence of a gauge for comparison; besides, they …
Optical spectroscopy of the microquasar GRS 1758-258: a possible intermediate mass system?
Luque-Escamilla, Pedro L.; Martí, Josep; Muñoz-Arjonilla, Álvaro J.
Context. GRS 1758-258 is one of two prototypical microquasars towards the Galactic center direction discovered almost a quarter of a century ago. The system remains poorly studied in the optical domain due to its counterpart being a very faint and absorbed target in a crowded region of the sky.
Aims: Our aim is to investigate GRS 1758-258 in …
The ionized X-ray outflowing torus in ESO 323-G77: low-ionization clumps confined by homogeneous warm absorbers
Miniutti, G.; Krongold, Y.; Longinotti, A. L. +2 more
We report on the long- and short-term X-ray spectral analysis of the polar-scattered Seyfert 1.2 galaxy ESO 323-G77, observed in three epochs between 2006 and 2013 with Chandra and XMM-Newton. Four high-resolution Chandra observations give us a unique opportunity to study the properties of the absorbers in detail, as well as their short time-scale…
Obscured AGNs in Bulgeless Hosts discovered by WISE: The Case Study of SDSS J1224+5555
Hickox, R. C.; Secrest, N. J.; Satyapal, S. +6 more
There is mounting evidence that supermassive black holes (SMBHs) form and grow in bulgeless galaxies. However, a robust determination of the fraction of active galactic nuclei (AGNs) in bulgeless galaxies, an important constraint to models of SMBH seed formation and merger-free models of AGN fueling, is unknown, since optical studies have been sho…
On the properties of dust and gas in the environs of V838 Monocerotis
Decin, L.; Swinyard, B. M.; De Beck, E. +4 more
Aims: We aim to probe the close and distant circumstellar environments of the stellar outburst object V838 Mon.
Methods: Herschel far-infrared imaging and spectroscopy were taken at several epochs to probe the central point source and the extended environment of V838 Mon. PACS and SPIRE maps were used to obtain photometry of the dust imm…
Structure and kinematics of the clouds surrounding the Galactic mini-starburst W43 MM1
Braine, J.; van der Tak, F.; Wyrowski, F. +2 more
Massive stars have a major influence on their environment, yet their formation is difficult to study as they form quickly in highly obscured regions and are rare, hence more distant than lower mass stars. Westerhout 43 (W43) is a highly luminous galactic massive star-forming region at a distance of 5.5 kpc and the MM1 part hosts a particularly mas…