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Multi-wavelength observations and modeling of a microflare: constraining non-thermal particle acceleration
Reeves, Katharine K.; Polito, Vanessa; Yu, Sijie +5 more
In this work we analyze a small B-class flare that occurred on 29 April 2021 and was observed simultaneously by the Interface Region Imaging Spectrograph (IRIS) and the Nuclear Spectroscopic Telescope Array (NuSTAR) X-ray instrument. The IRIS observations of the ribbon of the flare show peculiar spectral characteristics that are typical signatures…
The collisional and photoionized plasma in the polarized NLS1 galaxy Mrk 1239
Komossa, S.; Grupe, D.; Gallo, Luigi C. +4 more
Mrk 1239 is a highly polarized NLS1 in the optical band, whose 0.3-3 keV spectrum has remained remarkably consistent over more than two decades of observation. Previous analysis of this object suggested that the soft X-ray band was dominated by emission lines (collisionally and/or photoionized) from the distant host galaxy as the X-ray emission fr…
Plasma heating and particle acceleration in collisionless shocks through astrophysical observations
Miceli, M.
Supernova remnants (SNRs), the products of stellar explosions, are powerful astrophysical laboratories, which allow us to study the physics of collisionless shocks, thanks to their bright electromagnetic emission. Blast wave shocks generated by supernovae (SNe) provide us with an observational window to study extreme conditions, characterized by h…
Variability of Magnetic Hot Stars from the TESS Observations
Li, Gang; Zhang, Yu; Fu, Jian-Ning +7 more
Magnetic hot stars refer to stars that have effective temperatures approximately in the range from 7000-50,000 K, and with large-scale globally organized magnetic fields. These magnetic fields exhibit strengths ranging from tens of Gauss to tens of kilo-Gauss. They are key in understanding the effects caused by magnetic fields in the stellar evolu…
Caught in the Act: A Metal-rich High-velocity Cloud in the Inner Galaxy
Jenkins, Edward B.; Fox, Andrew J.; Wakker, Bart P. +7 more
We characterize the chemical and physical conditions in an outflowing high-velocity cloud (HVC) in the inner Galaxy. We report a supersolar metallicity of [O/H] = +0.36 ± 0.12 for the HVC at v LSR = 125.6 km s-1 toward the star HD 156359 (l = 328.°7, b = -14.°5, d = 9 kpc, z = -2.3 kpc). Using archival observations from the F…
Development of a new Phobos spectral simulant: spectral properties from visible to the mid-infrared range
Barucci, M. A.; Fornasier, S.; Doressoundiram, A. +6 more
Phobos is the target of the Martian Moons eXploration (MMX), the next sample return mission of the Japanese space agency (JAXA). The mission will investigate the origin of Phobos and Deimos - the two martian moons, using a suite of dedicated instruments. Infrared analysis of the surface composition will be performed by the MIRS spectrometer onboar…
The Mass of the Black Hole in NGC 5273 from Stellar Dynamical Modeling
Vasiliev, Eugene; Onken, Christopher A.; Bentz, Misty C. +2 more
We present a new constraint on the mass of the black hole in the active S0 galaxy NGC 5273. Due to the proximity of the galaxy at 16.6 ± 2.1 Mpc, we were able to resolve and extract the bulk motions of stars near the central black hole using adaptive-optics-assisted observations with the Gemini Near-infrared Integral Field Spectrograph, as well as…
The Apparent Absence of Forward Scattering in the HD 53143 Debris Disk
Stark, Christopher C.; MacGregor, Meredith A.; Weinberger, Alycia J. +5 more
HD 53143 is a mature Sun-like star and host to a broad disk of dusty debris, including a cold outer ring of planetesimals near 90 au. Unlike most other inclined debris disks imaged at visible wavelengths, the cold disk around HD 53143 appears as disconnected "arcs" of material, with no forward-scattering side detected to date. We present new, deep…
Field Gradient Analysis Based on a Geometrical Approach
Dunlop, M.; Shen, C.
Using multi-point observations from a spacecraft constellation, the spatial gradients of measured physical quantities can be calculated, and thus other derived parameters for the plasma (e.g., current density, topology of magnetic field lines, and wave vectors) can also be calculated. In this research, a geometrical method based on integral theore…
SRG/eROSITA-triggered XMM-Newton observations of three Be/X-ray binaries in the LMC: Discovery of X-ray pulsations
Haberl, F.; Udalski, A.; Ducci, L. +11 more
Context. Using data from eROSITA, the soft X-ray instrument aboard Spectrum-Roentgen-Gamma (SRG), we report the discovery of two new hard transients, eRASSU J050810.4-660653 and eRASSt J044811.1-691318, in the Large Magellanic Cloud. We also report the detection of the Be/X-ray binary RX J0501.6-7034 in a bright state.
Aims: We initiated foll…