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Chasing candidate Supergiant Fast X-ray Transients in the 1000 orbits INTEGRAL/IBIS catalogue
Sidoli, L.; Bird, A. J.; Bazzano, A. +2 more
We report results from an investigation at hard X-rays (above 18 keV) and soft X-rays (below 10 keV) of a sample of X-ray transients located on the Galactic plane and detected with the bursticity method, as reported in the latest 1000 orbits INTEGRAL/IBIS catalogue. Our main aim has been to individuate those with X-rays characteristics strongly re…
LoCuSS: exploring the connection between local environment, star formation, and dust mass in Abell 1758
Finoguenov, A.; Smith, G. P.; Egami, E. +3 more
We explore the connection between dust and star formation, in the context of environmental effects on galaxy evolution. In particular, we exploit the susceptibility of dust to external processes to assess the influence of dense environment on star-forming galaxies. We have selected cluster Abell 1758 from the Local Cluster Substructure Survey (LoC…
Extensive Study of a Coronal Mass Ejection with UV and White-light Coronagraphs: The Need for Multiwavelength Observations
Feng, Li; Lu, Lei; Gan, Weiqun +3 more
Coronal mass ejections (CMEs) often show different features in different bandpasses. By combining data in white-light (WL) and ultraviolet (UV) bands, we have applied different techniques to derive plasma temperatures, electron density, internal radial speed, and so on, within a fast CME. They serve as extensive tests of the diagnostic capabilitie…
The closest extremely low-mass white dwarf to the Sun
Vennes, Stéphane; Simpson, Jeffrey D.; Marino, Anna F. +4 more
We present the orbit and properties of 2MASS J050051.85-093054.9, establishing it as the closest (d ≈ 71 pc) extremely low-mass white dwarf to the Sun. We find that this star is hydrogen rich with $T_\textrm {eff}\approx 10\, 500$ K, log g ≈ 5.9, and, following evolutionary models, has a mass of ≈0.17 M⊙. Independent analysis of radial …
Optical Night Sky Brightness Measurements from the Stratosphere
Jauzac, Mathilde; Sivanandam, Suresh; Tam, Sut-Ieng +27 more
This paper presents optical night sky brightness measurements from the stratosphere using CCD images taken with the Super-pressure Balloon-borne Imaging Telescope (SuperBIT). The data used for estimating the backgrounds were obtained during three commissioning flights in 2016, 2018, and 2019 at altitudes ranging from 28 to 34 km above sea level. F…
Broadband X-ray analysis of 1E 1740.7-2942: constraints on spin, inclination, and a tentative black hole mass
Castro, M.; Stecchini, Paulo E.; Braga, J. +2 more
1E 1740.7-2942 is one of the strongest hard X-ray emitters in the Galactic Centre region, believed to be a black hole in a high-mass X-ray binary system. Although extensively studied in X-rays, many aspects about the underlying nature of the system are still unknown. For example, X-ray data analyses of 1E 1740.7-2942 to date have not yet unveiled …
Correcting the effect of magnetic tongues on the tilt angle of bipolar active regions
López Fuentes, M. C.; Mandrini, C. H.; Démoulin, P. +2 more
Context. The magnetic polarities of bipolar active regions (ARs) exhibit elongations in line-of-sight magnetograms during their emergence. These elongations are referred to as magnetic tongues and attributed to the presence of twist in the emerging magnetic flux-ropes (FRs) that form ARs.
Aims: The presence of magnetic tongues affects the mea…
Probing the Physical Conditions and Star Formation Processes in the Galactic H II Region S305
Dewangan, L. K.; Ojha, D. K.; Pandey, Rakesh +5 more
We present multiscale and multiwavelength observations of the Galactic H II region S305, which is excited by massive O8.5V and O9.5V stars. Infrared images reveal an extended sphere-like shell (extension ∼7.5 pc; at Td = 17.5-27 K) enclosing the S305 H II region (size ∼5.5 pc; age ∼1.7 Myr). The extended structure observed in the Hersch…
Extended radio emission associated with a breakout eruption from the back side of the Sun
Palmerio, E.; Kilpua, E. K. J.; Lynch, B. J. +1 more
Context. Coronal mass ejections (CMEs) on the Sun are the largest explosions in the Solar System that can drive powerful plasma shocks. The eruptions, shocks, and other processes associated to CMEs are efficient particle accelerators and the accelerated electrons in particular can produce radio bursts through the plasma emission mechanism.
Ai…
The Velocity Dispersion Function for Quiescent Galaxies in Nine Strong-lensing Clusters
Diaferio, Antonaldo; Hwang, Ho Seong; Geller, Margaret J. +2 more
We measure the central stellar velocity dispersion function for quiescent galaxies in a set of nine northern clusters in the redshift range 0.18 < z < 0.29 and with strong lensing arcs in Hubble Space Telescope images. The velocity dispersion function links galaxies directly to their dark matter halos. From dense SDSS and MMT/Hectospec spect…