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The coronal temperature of NGC 4388 and NGC 2110 measured with INTEGRAL
Bird, A. J.; Ubertini, P.; Malizia, A. +4 more
Aims: We aim to measure the physical properties of the hot X-ray corona of two active galactic nuclei, NGC 4388 and NGC 2110.
Methods: We analysed the hard X-ray (20-300 keV) INTEGRAL spectrum in conjunction with archival XMM-Newton and NuSTAR data.
Results: The X-ray spectrum of both sources is phenomenologically well described by …
Observations of the Ultra-compact X-Ray Binary 4U 1543-624 in Outburst with NICER, INTEGRAL, Swift, and ATCA
Altamirano, D.; Fabian, A. C.; Miller, J. M. +17 more
We report on X-ray and radio observations of the ultra-compact X-ray binary 4U 1543-624 taken in August 2017 during an enhanced accretion episode. We obtained Neutron Star Interior Composition Explorer (NICER) monitoring of the source over a ∼10 day period during which target-of-opportunity observations were also conducted with Swift, INTErnationa…
A Study of the 20 day Superorbital Modulation in the High-mass X-Ray Binary IGR J16493-4348
Fürst, Felix; Pottschmidt, Katja; Corbet, Robin H. D. +4 more
We report on Nuclear Spectroscopic Telescope Array (NuSTAR), Neil Gehrels Swift Observatory (Swift) X-ray Telescope (XRT), and Swift Burst Alert Telescope (BAT) observations of IGR J16493-4348, a wind-fed supergiant X-ray binary showing significant superorbital variability. From a discrete Fourier transform of the BAT light curve, we refine its su…
A far-UV survey of three hot, metal-polluted white dwarf stars: WD0455-282, WD0621-376, and WD2211-495
Webb, John K.; Lee, Chung-Chi; Reindl, Nicole +7 more
Using newly obtained high-resolution data (R ∼ 1 × 105) from the Hubble Space Telescope, and archival UV data from the Far Ultraviolet Spectroscopic Explorer, we have conducted a detailed UV survey of the three hot, metal-polluted white dwarfs WD0455-282, WD0621-376, and WD2211-495. Using bespoke model atmospheres, we measured Teff…
An investigation of C, N, and Na abundances in red giant stars of the Sculptor dwarf spheroidal galaxy
Da Costa, G. S.; Yong, D.; Norris, J. E. +1 more
The origin of the star-to-star abundance variations found for the light elements in Galactic globular clusters (GGCs) is not well understood, which is a significant problem for stellar astrophysics. While the light element abundance variations are very common in globular clusters, they are comparatively rare in the Galactic halo field population. …
Mutual impedance probe in collisionless unmagnetized plasmas with suprathermal electrons - Application to BepiColombo
Henri, Pierre; Myllys, Minna; Béghin, Christian +4 more
Mutual impedance experiments are active electric probes providing in-situ space plasma measurements. Such active experiments consist of a set of electric antennas used as transmitter(s) and receivers(s) through which various dielectric properties of the plasma can be probed, giving therefore access to key plasma parameters such as, for instance, t…
Ground-based infrared mapping of H2O2 on Mars near opposition
Aoki, S.; Daerden, F.; Neary, L. +12 more
We pursued our ground-based seasonal monitoring of hydrogen peroxide on Mars using thermal imaging spectroscopy, with two observations of the planet near opposition, in May 2016 (solar longitude Ls = 148.5°, diameter = 17 arcsec) and July 2018 (Ls = 209°, diameter = 23 arcsec). Data were recorded in the 1232-1242 cm-1 range (8.1 µ…
Searches for Population III pair-instability supernovae: Impact of gravitational lensing magnification
Oguri, Masamune; Koyama, Yusei; Nomoto, Ken'ichi +3 more
Superluminous supernovae have been proposed to arise from Population III progenitors that explode as pair-instability supernovae (PISNe). Population III stars are the first generation of stars in the Universe, and are thought to have formed as late as z ∼ 6. Future near-infrared imaging facilities such as ULTIMATE-Subaru will potentially be able t…
A young multipolar planetary nebula in the making—IRAS 21282+5050
Zhang, Yong; Kwok, Sun; Hsia, Chih-Hao +1 more
We present high-angular-resolution Hubble Space Telescope (HST) optical and near-infrared imaging of the compact planetary nebula (PN) IRAS 21282+5050. Optical images of this object reveal several complex morphological structures including three pairs of bipolar lobes and an elliptical shell lying close to the plane of the sky. From near-infrared …
The nature of the infrared counterpart and of the optical nebula associated with the Central Compact Object in Vela Jr.
Pellizzoni, A.; De Luca, A.; Mignani, R. P. +3 more
The X-ray source CXO J085201.4-461753 in the few kyr-old Vela Jr. supernova remnant (SNR, G266.2-1.2) belongs to the peculiar class of isolated neutron stars dubbed `Central Compact Objects' (CCOs). At variance with the other CCOs, which are only detected in the X-rays, CXO J085201.4-461753 has been possibly detected also at other wavelengths. In …