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The 18-19 March 2022 series of 3He-rich events observed by Solar Orbiter at 0.36 au compared with EUV, X-ray, and radio observations
Maksimovic, M.; Vecchio, A.; Krucker, S. +10 more
Context. During the first close perihelion pass of Solar Orbiter, a series of impulsive 3He-rich solar particle events was observed on 18-19 March 2022 from a distance of 0.36 au. In addition to the energetic particle, radio, and X-ray data from Solar Orbiter, the events were observed in radio and/or extreme ultraviolet by STEREO-A, SDO…
Coronal properties of low-accreting AGNs using Swift, XMM-Newton, and NuSTAR observations
Safi-Harb, Samar; Chang, Hsiang-Kuang; Ricci, Claudio +6 more
We studied the broad-band X-ray spectra of Swift/Burst Alert Telescope selected low-accreting active galactic nuclei (AGNs) using the observations from XMM-Newton, Swift, and NuSTAR in the energy range of 0.5-150 keV. Our sample consists of 30 AGNs with Eddington ratio, λEdd < 10-3. We extracted several coronal parameters …
Magellan/M2FS and MMT/Hectochelle Spectroscopy of Dwarf Galaxies and Faint Star Clusters within the Galactic Halo
Caldwell, Nelson; Mateo, Mario; Roederer, Ian U. +5 more
We present spectroscopic data for 16,369 stellar targets within and/or toward 38 dwarf spheroidal galaxies and faint star clusters within the Milky Way halo environment. All spectra come from observations with the multiobject, fiber-fed echelle spectrographs M2FS at the Magellan/Clay telescope or Hectochelle at the MMT, reaching a typical limiting…
Role of Small-scale Impulsive Events in Heating the X-Ray Bright Points of the Quiet Sun
Del Zanna, Giulio; Bhardwaj, Anil; Mason, Helen E. +6 more
Small-scale impulsive events, known as nanoflares, are thought to be one of the prime candidates that can keep the solar corona hot at its multimillion-Kelvin temperature. Individual nanoflares are difficult to detect with the current generation of instruments; however, their presence can be inferred through indirect techniques such as Differentia…
Discovery of double BSS sequences in the old Galactic open cluster Berkeley 17
Vaidya, Kaushar; Rao, Khushboo K.; Agarwal, Manan +1 more
Blue straggler stars (BSS) are peculiar objects which normally appear as a single broad sequence along the extension of the main sequence. Only four globular clusters (GCs) have been observed to have two distinct and parallel BSS sequences. For the first time for any open cluster (OC), we report double BSS sequences in Berkeley 17. Using the machi…
Stirred but not shaken: a multiwavelength view of HD 16743's debris disc
del Burgo, C.; Milli, J.; Kral, Q. +6 more
Planetesimals - asteroids and comets - are the building blocks of planets in protoplanetary discs and the source of dust, ice, and gas in debris discs. Along with planets they comprise the left-over material after star formation that constitutes a planetary system. Planets influence the dynamics of planetesimals, sculpting the orbits of debris bel…
Aliphatics and Aromatics in the Universe: The Pre-JWST Era
Li, Aigen; Yang, X. J.
The so-called "unidentified infrared emission" (UIE) features at 3.3, 6.2, 7.7, 8.6, and 11.3 µm ubiquitously seen in a wide variety of astrophysical regions are generally attributed to polycyclic aromatic hydrocarbon (PAH) molecules. Astronomical PAHs often have an aliphatic component (e.g., aliphatic sidegroups like methyl -CH3 …
A Broadband X-Ray Study of the Rabbit Pulsar Wind Nebula Powered by PSR J1418-6058
Woo, Jooyun; An, Hongjun; Mori, Kaya +4 more
We report on broadband X-ray properties of the Rabbit pulsar wind nebula (PWN) associated with the pulsar PSR J1418-6058 using archival Chandra and XMM-Newton data, as well as a new NuSTAR observation. NuSTAR data above 10 keV allowed us to detect the 110 ms spin period of the pulsar, characterize its hard X-ray pulse profile, and resolve hard X-r…
Tilt-to-length coupling in LISA Pathfinder: Analytical modeling
Hartig, Marie-Sophie; Wanner, Gudrun
Tilt-to-length coupling was the limiting noise source in LISA Pathfinder between 20 and 200 mHz before subtraction in postprocessing. To prevent the adding of sensing noise to the data by the subtraction process, the success of this strategy depended on a previous direct noise reduction by test mass alignment. The exact dependency of the level of …
SDSS J134441.83+204408.3: A Highly Asynchronous Short-period Magnetic Cataclysmic Variable with a 56 MG Field Strength
Garnavich, Peter; Littlefield, Colin; Szkody, Paula +6 more
When the accreting white dwarf in a magnetic cataclysmic variable star (mCV) has a field strength in excess of 10 MG, it is expected to synchronize its rotational frequency to the binary orbit frequency, particularly at small binary separations, due to the steep radial dependence of the magnetic field. We report the discovery of an mCV (SDSS J1344…