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Nowhere to hide: Radio-faint AGN in the GOODS-N field. II. Multi-wavelength AGN selection techniques and host galaxy properties
Muxlow, T. W. B.; Thomson, A. P.; Garrett, M. A. +3 more
Context. Obtaining a census of active galactic nuclei (AGN) activity across cosmic time is critical to our understanding of galaxy evolution and formation. Many AGN classification techniques are compromised by dust obscuration. However, very long baseline interferometry (VLBI) can be used to identify high brightness temperature compact radio emiss…
Hubble Space Telescope [O III] emission-line kinematics in two nearby QSO2s: a case for X-ray feedback
Turner, T. J.; Kraemer, S. B.; Crenshaw, D. M. +15 more
We present a dynamical study of the narrow-line regions in two nearby type 2 quasars (QSO2s). We construct dynamical models based on detailed photoionization models of the emission-line gas, including the effects of internal dust, to apply to observations of large-scale outflows from these active galactic nuclei (AGNs). We use Mrk 477 and Mrk 34 i…
Stellar Population Astrophysics (SPA) with the TNG. Stock 2, a little-studied open cluster with an eMSTO
Vallenari, A.; Bragaglia, A.; Spina, L. +14 more
Stock 2 is a little-studied open cluster that shows an extended main-sequence turnoff (eMSTO). In order to investigate this phenomenon and characterise the cluster itself, we performed high-resolution spectroscopy in the framework of the Stellar Population Astrophysics project. We employed the High Accuracy Radial velocity Planet Searcher in the N…
Depositional Controls of the Layered Deposits of Arabia Terra, Mars: Hints From Basin Geometries and Stratigraphic Trends
Rossi, A. P.; Pondrelli, M.; Le Deit, L. +4 more
An extensive distribution of water-altered equatorial layered deposits (ELDs) characterizes the densely cratered terrain of Arabia Terra (AT), Mars. The majority of these deposits reside within craters and are easily identified by laterally continuous layering. The processes that led to their formation have been widely investigated, but remain unr…
Interaction of Space Weather Phenomena with Mars Plasma Environment During Solar Minimum 23/24
Fedorov, A.; Nilsson, H.; Sánchez-Cano, B. +5 more
We study the interaction of three solar wind (SW) structures, two stream interaction regions, and one interplanetary coronal mass ejection, with Mars' plasma environment during November 20-27, 2007. This period corresponds to the solar minimum between the solar cycles 23 and 24 which was characterized by very low values of the SW density and dynam…
The search for extratidal star candidates around Galactic globular clusters NGC 2808, NGC 6266, and NGC 6397 with Gaia DR2 astrometry
Piatti, Andrés E.; Minniti, Dante; Fernández-Trincado, José G. +5 more
Context. Extratidal stars are stellar bodies that end up outside the tidal radius of a cluster as a result of internal processes or external forces acting upon it. The presence and spatial distribution of these stars can give us insights into the past evolution of a cluster inside our Galaxy.
Aims: Previous works suggest that globular cluster…
A Review of Electrostatic Solitary Wave Research From the Cluster Mission
Pickett, J. S.
A review of the advancements in the knowledge of electrostatic solitary waves (ESWs) made with data obtained by the four satellite Cluster mission, after 20 years in orbit, is presented. ESWs are nonlinear solitary waves or structures observed in high time resolution waveform data. The ESW pulses are the wave data representation of electron or ion…
Asteroseismology of iota Draconis and Discovery of an Additional Long-period Companion
Chaplin, William J.; Kane, Stephen R.; Stassun, Keivan G. +25 more
Giant stars as known exoplanet hosts are relatively rare due to the potential challenges in acquiring precision radial velocities and the small predicted transit depths. However, these giant host stars are also some of the brightest in the sky and so enable high signal-to-noise ratio follow-up measurements. Here, we report on new observations of t…
SPECIES. II. Stellar parameters of the EXPRESS giant star sample
Jones, M. I.; Soto, M. G.; Jenkins, J. S.
Context. As part of the search for planets around evolved stars, we can understand planet populations around significantly higher-mass stars than the Sun on the main sequence. This population is difficult to study any other way, such as using radial-velocities to measure planet masses and orbital mechanics, since the stars are too hot and rotate t…
Spectral analysis of the low-mass X-ray pulsar 4U 1822-371: Reflection component in a high-inclination system
Sanna, A.; Di Salvo, T.; Burderi, L. +6 more
Context. The X-ray source 4U 1822-371 is an eclipsing low-mass X-ray binary and X-ray pulsar, hosting a NS that shows periodic pulsations in the X-ray band with a period of 0.59 s. The inclination angle of the system is so high (80-85°) that in principle, it should be hard to observe both the direct thermal emission of the central object and the r…