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Optical IFU spectroscopy of a bipolar microquasar jet in NGC 300
Maccarone, T. J.; Motch, C.; Knigge, C. +9 more
We recently reported the discovery of a candidate jet-driving microquasar (S10) in the nearby spiral galaxy NGC 300. However, in the absence of kinematic information, we could not reliably determine the jet power or the dynamical age of the jet cavity. Here, we present optical Multi Unit Spectroscopic Explorer (MUSE) integral field unit (IFU) obse…
Relativistic Astronomy. II. In-flight Solution of Motion and Test of Special Relativity Light Aberration
Zhang, Bing; Yang, Yuan-Pei; Zhu, Jin-Ping
The Breakthrough Starshot project aims to send centimeter-sized, gram-scale “StarChip” probes to Alpha Centauri at a speed of ∼0.2 c. On the other hand, Zhang & Li recently proposed that transrelativistic cameras may be sent to any direction to study astronomical objects and test special relativity. To conduct such “relativistic astronomy,” on…
An ALMA/HST Study of Millimeter Dust Emission and Star Clusters
Dale, D. A.; Calzetti, D.; Smith, L. J. +7 more
We present results from a joint ALMA/HST study of the nearby spiral galaxy NGC 628. We combine the Hubble Space Telescope (HST) Legacy ExtraGalactic UV Survey (LEGUS) database of over 1000 stellar clusters in NGC 628 with ALMA Cycle 4 mm/submillimeter observations of the cold dust continuum that span ∼15 kpc2 including the nuclear regio…
Measuring the Yarkovsky effect with Las Cumbres Observatory
Lister, Tim; Farnocchia, Davide; Greenstreet, Sarah
The Las Cumbres Observatory (LCOGT) provides an ideal platform for follow-up and characterization of Solar System objects (e.g. asteroids, Kuiper belt objects (KBOs), comets, and near-Earth objects (NEOs)) as well as for the discovery of new objects. The LCOGT network allows for regular monitoring of a sample of targets, such as that of NEOs for w…
Performance Analysis of the SO/PHI Software Framework for On-board Data Reduction
Solanki, S. K.; Lagg, A.; Fiethe, B. +12 more
The Polarimetric and Helioseismic Imager (PHI) is the first deep-space solar spectropolarimeter, on-board the Solar Orbiter (SO) space mission. It faces: stringent requirements on science data accuracy, a dynamic environment, and severe limitations on telemetry volume. SO/PHI overcomes these restrictions through on-board instrument calibration and…
Formation of coarse sediment lags in ice-sediment mixtures: A geomorphic signature of sublimation on regolith surfaces
Levy, Joseph S.; Aylward, Daniel S.; Schmidt, Logan M.
In many high-latitude locations on Mars, boulder sized clasts are present at the ground surface atop finer-grained sediments. These areas are concentrated in the latitude dependent mantle (LDM), an ice-rich surface unit that is globally distributed polewards of ∼30° latitude. Here, we test the hypothesis that sublimation of buried ice can drive gr…
Observational constraints on the magnetic field of the bright transient Be/X-ray pulsar SXP 4.78
Tsygankov, Sergey S.; Lutovinov, Alexander A.; Poutanen, Juri +4 more
We report results of the spectral and timing analysis of the Be/X-ray pulsar SXP 4.78 using the data obtained during its recent outburst with NuSTAR, Swift, Chandra, and NICER observatories. Using an overall evolution of the system luminosity, spectral analysis, and variability power spectrum we obtain constraints on the neutron star magnetic fiel…
Hubble Space Telescope Far-UV Spectroscopy of the Short Orbital Period Recurrent Nova CI Aql: Implications for White Dwarf Mass Evolution
Williams, Robert E.; Wilson, R. E.; Sion, Edward M. +3 more
An Hubble Space Telescope Cosmic Object Spectrograph Far UV spectrum (1170 Å to 1800 Å) was obtained for the short orbital period recurrent novae (T Pyxidis subclass), CI Aquilae. CI Aql is the only classical Cataclysmic variable (CV) known to have two eclipses of a sensible depth per orbit cycle and also to have pre- and post-outburst light curve…
MHD simulation of the solar wind flow around the coma of comet Churyumov-Gerasimenko during Rosetta's flyby
Baranov, V. B.; Alexashov, D. B.; Lebedev, M. G.
The magnetohydrodynamic (MHD) model of the interaction between the solar wind and a cometary ionosphere is applied to investigate certain peculiar features of the solar wind flow around comet Churyumov-Gerasimenko during Rosetta's flyby at this comet. The model accounts for photoionization of the neutral component of the cometary outflow and the r…
A method to analyse velocity structure
Arnold, Becky; Goodwin, Simon P.
We present a new method of analysing and quantifying velocity structure in star-forming regions suitable for the rapidly increasing quantity and quality of stellar position-velocity data. The method can be applied to data in any number of dimensions, does not require the centre or characteristic size (e.g. radius) of the region to be determined, a…