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Correcting Parker Solar Probe Electron Measurements for Spacecraft Magnetic and Electric Fields
Whittlesey, Phyllis; Kasper, Justin; Larson, Davin +2 more
The spacecraft body of the Parker Solar Probe may interfere with electron measurements in two ways. The first is the presence of several permanent magnets near the Solar Probe Analyzers (SPAN) instruments. The second is the widely varying spacecraft potential. We estimate the effect of these interferences by performing particle tracing simulations…
An enigmatic hump around 30 keV in Suzaku spectra of Aquila X-1 in the hard state
Makishima, Kazuo; Tamagawa, Toru; Nakano, Toshio +4 more
The typical accreting neutron star, Aquila X-1, was observed with Suzaku seven times in the decay phase of an outburst in 2007 September-October. Among them, the second to the fourth observations were performed 10 to 22 days after the outburst peak, when the source was in the hard state with a luminosity of 2 × 1036 erg s-1. …
Discovery and Identification of MAXI J1621-501 as a Type I X-Ray Burster with a Super-orbital Period
Göğüş, Ersin; Bahramian, Arash; Chakrabarty, Deepto +26 more
MAXI J1621-501 is the first Swift/XRT Deep Galactic Plane Survey transient that was followed up with a multitude of space missions (NuSTAR, Swift, Chandra, NICER, INTEGRAL, and MAXI) and ground-based observatories (Gemini, IRSF, and ATCA). The source was discovered with MAXI on 2017 October 19 as a new, unidentified transient. Further observations…
Early science with the Large Millimetre Telescope: new mm-wave detections of circumstellar discs in IC 348 from LMT/AzTEC
Gutermuth, Robert A.; Lane, James; Wilson, Grant W. +2 more
We present the most complete sample of mm measurements of protoplanetary discs in the star-forming region IC 348 to date. New observations from the Large Millimetre Telescope and the 1.1 mm camera AzTEC are combined with literature results in order to characterize the disc population as relating to both stellar properties within the IC 348 region …
Search for Evolutionary Changes in the Periods of Cepheids: BY Cas
Berdnikov, L. N.
For the low-amplitude Cepheid BY Cas we have constructed an O - C diagram spanning a time interval 123 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 = +0.985 (±0.091) s yr-1
Results from the SuperModel analysis of the X-COP galaxy clusters sample
Fusco-Femiano, Roberto
In this work, the analysis of the stacked projected temperature profile of 12 galaxy clusters of the X-COP sample is performed via the SuperModel, a tool for investigating the intracluster medium thermodynamic properties already tested on many clusters since 2009. Two separate fits have been carried out: to the joint X-ray and SZ-projected tempera…
Absolute dimensions of the low-mass eclipsing binary system NSVS 10653195
Torres, Guillermo; López-Morales, Mercedes; Coughlin, Jeffrey L. +3 more
Context. Low-mass stars in eclipsing binary systems show radii larger and effective temperatures lower than theoretical stellar models predict for isolated stars with the same masses. Eclipsing binaries with low-mass components are hard to find due to their low luminosity. As a consequence, the analysis of the known low-mass eclipsing systems is k…
Low-frequency magnetic variations at the high-β Earth bow shock
Petrukovich, Anatoli A.; Chugunova, Olga M.; Shustov, Pavel I.
Observations of Earth's bow shock during high-β (ratio of thermal to magnetic pressure) solar wind streams are rare. However, such shocks are ubiquitous in astrophysical plasmas. Typical solar wind parameters related to high β (here β>10) are as follows: low speed, high density, and a very low interplanetary magnetic field of 1-2 nT. These cond…
A catalogue of nuclear stellar velocity dispersions of nearby galaxies from Hα STIS spectra to constrain supermassive black hole masses
Sarzi, Marc; Dalla Bontà, Elena; Corsini, Enrico Maria +4 more
We present new measurements for the nuclear stellar velocity dispersion σ* within sub-arcsecond apertures for 28 nearby galaxies. Our data consist of Space Telescope Imaging Spectrograph (STIS) long-slit spectra obtained with the G750M grating centred on the Hα spectral range. We fit the spectra using a library of single stellar populat…
Chromospheric UV Bursts and Turbulent-driven Magnetic Reconnection
Wu, Pin
We use Interface Region Imaging Spectrograph (IRIS) spacecraft data to study a group of Chromospheric ultraviolet bursts (UVBs) associated with an active region. We classify the UVBs into two types: smaller ones that can only be measured once by the scanning slit, and larger UVBs that are measured twice by the slit. The UVBs’ optically thin Si IV …