Search Publications
Mid-infrared imaging of Supernova 1987A
Matsuura, Mikako; Barlow, M. J.; Meixner, Margaret +9 more
At a distance of 50 kpc, Supernova 1987A is an ideal target to study how a young supernova (SN) evolves in time. Its equatorial ring, filled with material expelled from the progenitor star about 20 000 yr ago, has been engulfed with SN blast waves. Shocks heat dust grains in the ring, emitting their energy at mid-infrared (IR) wavelengths We prese…
The VMC survey - XLIX. Discovery of a population of quasars dominated by nuclear dust emission behind the Magellanic Clouds
Maitra, Chandreyee; Hopkins, Andrew M.; Haberl, Frank +14 more
Following the discovery of SAGE0536AGN (z ~ 0.14), with the strongest 10-µm silicate emission ever observed for an active galactic nucleus (AGN), we discovered SAGE0534AGN (z ~ 1.01), a similar AGN but with less extreme silicate emission. Both were originally mistaken as evolved stars in the Magellanic Clouds. Lack of far-infrared emission, …
SRG/eROSITA view of X-ray reflection in the Central Molecular Zone: a snapshot in September-October 2019
Khabibullin, Ildar; Churazov, Eugene; Sunyaev, Rashid
X-ray reflection off dense molecular clouds in the Galactic Centre region has established itself as a powerful probe for the past activity record of the supermassive black hole Sgr A* on a time-scale of a few hundred years. Detailed studies of the reflection signal from individual clouds allow us to estimate parameters of the brightest flare(s) an…
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…