Search Publications
Modelling multiwavelength emission of Ultra-luminous X-ray Sources accreting above the Eddington limit
Wolter, A.; Pintore, F.; Zampieri, L. +1 more
We model the multiwavelength properties of binaries accreting at super-critical rates with the aim to better understand the observational properties of Ultra-luminous X-ray Sources (ULXs). We calculate an extended grid of binary systems which evolve through Roche Lobe Overflow and undergo case A mass transfer from massive donors (up to 25 ${\rm M}…
Trumpler 16-26: a new centrifugal magnetosphere star discovered via SDSS/APOGEE H-band spectroscopy
Rivinius, Thomas; Nidever, David L.; Labadie-Bartz, Jonathan +6 more
We report the discovery of a new example of the rare class of highly magnetized, rapidly rotating, helium enhanced, early B stars that produce anomalously wide hydrogen emission due to a centrifugal magnetosphere (CM). The star is Trumpler 16-26, a B1.5 V member of the Trumpler 16 open cluster. A CM was initially suspected based on hydrogen Bracke…
The progenitor of the Vela pulsar
Kochanek, C. S.
With Gaia parallaxes, it is possible to study the stellar populations associated with individual Galactic supernova remnants (SNRs) to estimate the mass of the exploding star. Here, we analyse the luminous stars near the Vela pulsar and SNR to find that its progenitor was probably ($\mathrel {\raise.3ex\rm{\gt }\lower0.6ex\rm{\sim }}90\rm \,per\,c…
Kinematics of luminous blue variables in the Large Magellanic Cloud
Choi, Yumi; Smith, Nathan; Andrews, Jennifer +3 more
We study the kinematics of luminous blue variables (LBVs) in the Large Magellanic Cloud (LMC). Using high-resolution spectra, we measure the systemic radial velocities for a sample of 16 LBVs and LBV candidates. In order to measure the net motion of LBVs compared to their local environments, we subtract the projected line-of-sight velocity at the …
A detailed study of stellar populations of three star clusters with extended main-sequence turnoffs
Li, Zhongmu; Chen, Jing; Zhang, Su +2 more
This paper investigates the extended main-sequence turnoffs (eMSTOs) and stellar populations of three clusters with different ages using Gaia Data Release 2 (DR2) data in detail. The colour-magnitude diagrams (CMDs) of three Galactic clusters show broad main sequences, eMSTOs, blue stragglers, and red giant clumps. We explore the effects of age sp…
Multiple giant eruptions and X-ray emission in the recoiling AGN/LBV candidate SDSS1133
Kokubo, Mitsuru
We present a comprehensive analysis of 20 yr worth of multicolour photometric light curves, multiepoch optical spectra, and X-ray data of an off-nuclear variable object SDSS1133 in Mrk 177 at z = 0.0079. The UV-optical light curves reveal that SDSS1133 experienced four outbursts in 2001, 2014, 2019, and 2021. The persistent UV-optical luminosity i…
Collimation of the kiloparsec-scale radio jets in NGC 2663
Salvato, M.; Nandra, K.; Filipović, M. D. +25 more
We present the discovery of highly collimated radio jets spanning a total of 355 kpc around the nearby elliptical galaxy NGC 2663, and the possible first detection of recollimation on kiloparsec scales. The small distance to the galaxy (~28.5 Mpc) allows us to resolve portions of the jets to examine their structure. We combine multiwavelength data…
Classifying IGR J18007-4146 as an intermediate polar using XMM and NuSTAR
Hare, Jeremy; Mukai, Koji; Fornasini, Francesca M. +5 more
Many new and unidentified Galactic sources have recently been revealed by ongoing hard X-ray surveys. A significant fraction of these have been shown to be the type of accreting white dwarfs known as cataclysmic variables (CVs). Follow-up observations are often required to categorize and classify these sources, and may also identify potentially un…
Orphan optical flare as SOSS emission afterglow, localization in time
Zhirkov, K.; Gorbovskoy, E.; Serra-Ricart, M. +24 more
We report on MASTER optical observations of an afterglow-like optical and X-ray transient AT2021lfa/ZTF21aayokph. We detected the initial steady brightening of the transient at 7σ confidence level. This allowed us to use smooth optical self-similar emission of GRBs model to constrain the explosion time to better than 14 min as well as to estimate …
Forbush decreases caused by paired interacting solar wind disturbances
Belov, A. V.; Abunina, M. A.; Abunin, A. A. +3 more
The paper discusses changes in various characteristics of the solar wind, interplanetary magnetic field, geomagnetic activity, and cosmic rays during the registration of paired interacting solar wind disturbances on the Earth using the data base of Forbush effects and interplanetary disturbances - FEID. The cases of pair interaction are considered…