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Optical, X-ray, and γ-ray observations of the candidate transitional millisecond pulsar 4FGL J0427.8-6704
Dhillon, V. S.; Kerr, M.; Marsh, T. R. +7 more
We present an optical, X-ray, and γ-ray study of 1SXPS J042749.2-670434, an eclipsing X-ray binary that has an associated γ-ray counterpart, 4FGL J0427.8-6704. This association has led to the source being classified as a transitional millisecond pulsar (tMSP) in an accreting state. We analyse 10.5 yr of Fermi LAT data and detect a γ-ray eclipse at…
Dust Environment Model of the Interstellar Comet 2I/Borisov
Fulle, M.; Cremonese, G.; Lazzarin, M. +27 more
2I/Borisov is the first interstellar comet discovered on 2019 August 30, and it soon showed a coma and a dust tail. This study reports the results of images obtained at the Telescopio Nazionale Galileo telescope, on La Palma - Canary Islands, in 2019 November and December. The images have been obtained with the R filter in order to apply our dust …
Solar Flare-CME Coupling throughout Two Acceleration Phases of a Fast CME
Veronig, Astrid M.; Dumbović, Mateja; Temmer, Manuela +8 more
Solar flares and coronal mass ejections (CMEs) are closely coupled through magnetic reconnection. CMEs are usually accelerated impulsively within the low solar corona, synchronized with the impulsive flare energy release. We investigate the dynamic evolution of a fast CME and its associated X2.8 flare occurring on 2013 May 13. The CME experiences …
Direct collapse to supermassive black hole seeds: the critical conditions for suppression of H2 cooling
Fang, Taotao; Nagamine, Kentaro; Shlosman, Isaac +1 more
Observations of high-redshift quasars imply the presence of supermassive black holes (SMBHs) already at z ∼ 7.5. An appealing and promising pathway to their formation is the direct collapse scenario of a primordial gas in atomic-cooling haloes at z ∼ 10-20, when the H2 formation is inhibited by a strong background radiation field, whose…
Nonparametric galaxy morphology from UV to submm wavelengths
Clark, Christopher J. R.; Mosenkov, Aleksandr V.; De Looze, Ilse +13 more
We present the first nonparametric morphological analysis of a set of spiral galaxies from UV to submillimeter (submm) wavelengths. Our study is based on high-quality multi-wavelength imaging for nine well-resolved spiral galaxies from the DustPedia database, combined with nonparametric morphology indicators calculated in a consistent way using th…
Molecular gas in CLASH brightest cluster galaxies at z ∼ 0.2 - 0.9
Jablonka, P.; Castignani, G.; Combes, F. +4 more
Brightest cluster galaxies (BCGs) are excellent laboratories for the study of galaxy evolution in dense Mpc-scale environments. We used the IRAM-30 m to observe, in CO(1→0), CO(2→1), CO(3→2), or CO(4→3), 18 BCGs at z ∼ 0.2 - 0.9 drawn from the Cluster Lensing And Supernova survey with Hubble (CLASH) survey. Our sample includes RX1532, which is our…
The dynamics of the γ Vel cluster and nearby Vela OB2 association
Wright, Nicholas J.; Jeffries, R. D.; Jackson, R. J. +1 more
The kinematics of low-mass stars in nearby OB associations can provide clues about their origins and evolution. Combining the precise positions, proper motions, and parallaxes given in the second Gaia Data Release with radial-velocity measurements obtained with the Hermes spectrograph at the Anglo-Australian Telescope, we have an opportunity to st…
SPInS, a pipeline for massive stellar parameter inference. A public Python tool to age-date, weigh, size up stars, and more
Reese, D. R.; Lebreton, Y.
Context. Stellar parameters are required in a variety of contexts, ranging from the characterisation of exoplanets to Galactic archaeology. Among them, the age of stars cannot be directly measured, while the mass and radius can be measured in some particular cases (e.g. binary systems, interferometry). More generally, stellar ages, masses, and rad…
Spacecraft and interplanetary contributions to the magnetic environment on-board LISA Pathfinder
Mendes, L.; Russano, G.; Nofrarias, M. +79 more
LISA Pathfinder (LPF) has been a space-based mission designed to test new technologies that will be required for a gravitational wave observatory in space. Magnetically driven forces play a key role in the instrument sensitivity in the low-frequency regime (mHz and below), the measurement band of interest for a space-based observatory. The magneti…
Extreme variability in an active galactic nucleus: Gaia16aax
Hewett, P. C.; Kostrzewa-Rutkowska, Z.; Wevers, T. +12 more
We present the results of a multiwavelength follow-up campaign for the luminous nuclear transient Gaia16aax, which was first identified in 2016 January. The transient is spatially consistent with the nucleus of an active galaxy at z = 0.25, hosting a black hole of mass ∼ 6× 10^8 M_⊙. The nucleus brightened by more than 1 mag in the Gaia G band ove…