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Revisiting the accretion disc spectra of dwarf novae and nova-like variables: implications for the standard disc model
Pringle, J. E.; Naylor, T.; Zsidi, Gabriella +1 more
Accretion discs are fundamental to much of astronomy. They can occur around stars, both young and old, around compact objects they provide a window into the extremes of physics, and around supermassive black holes in galaxy centres, they generate spectacular luminosities that can outshine the entire galaxy. However, our understanding of the inner …
Cassini UVIS Observations of the Enceladus Auroral Footprint on Saturn in 2017
Pryor, Wayne R.; Magalhães, Fabiola P.; Lamy, Laurent +5 more
Ultraviolet Imaging Spectrograph (UVIS) observations show the Enceladus auroral footprint on Saturn on 2017 September 14, near the end of the Cassini mission. A series of Saturn north polar auroral images were obtained by slowly slewing the Cassini spacecraft at right angles to the UVIS long slit. The images were limb-fit to improve the spacecraft…
High-precision spectral inversions: Determining what is important for the accurate definition of incident radiation boundary conditions
Heinzel, P.; Gunár, S.
Context. Spectral inversions are used to analyse spectroscopic observations with the aim of deriving the physical properties of the observed plasma, such as the kinetic temperature, density, pressure, degree of ionisation, or macroscopic velocities. One of the key factors ensuring the high precision of the derived plasma properties is having accur…
Using AI for Wave-front Estimation with the Rubin Observatory Active Optics System
Thomas, Sandrine; Connolly, Andrew J.; Suberlak, Krzysztof +6 more
The Vera C. Rubin Observatory will, over a period of 10 yr, repeatedly survey the southern sky. To ensure that images generated by Rubin meet the quality requirements for precision science, the observatory will use an active-optics system (AOS) to correct for alignment and mirror surface perturbations introduced by gravity and temperature gradient…
Solar prominence diagnostics and their associated estimated errors from 1D NLTE Mg II h&k modelling
Barczynski, K.; Schmieder, B.; Labrosse, N. +1 more
Aims: We present further development of the rolling root mean square (rRMS) algorithm. These improvements consist of an increase in computational speed and an estimation of the uncertainty on the recovered diagnostics. This improved algorithm is named the cross root mean square (xRMS) algorithm.
Methods: We used the quantile method to re…
Magnetic fields under feedback: a case study of the massive star-forming hub G34.26 + 0.15
Pattle, Kate; Khan, Zacariyya Afzal; Graves, Sarah F.
We present 850
Candidates for Substellar Members of the Orion Nebula Cluster from JWST/NIRCam
Luhman, K. L.
In 2022, the James Webb Space Telescope (JWST) obtained 1–5 µm images of the center of the Orion Nebula Cluster (ONC). I have analyzed these data in an attempt to search for substellar members of the cluster. Using a pair of color–color diagrams, I have identified >200 brown dwarf candidates that lack spectral classifications. Some of the…
Relativistic X-ray reflection from the accreting millisecond X-ray pulsar IGR J17498-2921
Dewangan, Gulab C.; Mondal, Aditya S.; Raychaudhuri, Biplab +3 more
The accreting millisecond X-ray pulsar IGR J17498-2921 went into X-ray outburst on 2023 April 13-15, for the first time since its discovery on 2011 August 11. Here, we report on the first follow-up NuSTAR observation of the source, performed on 2023 April 23, around 10 d after the peak of the outburst. The NuSTAR spectrum of the persistent emissio…
Stellar Variability and Distance Indicators in the Near-infrared in Nearby Galaxies. I. RR Lyrae and Anomalous Cepheids in Draco Dwarf Spheroidal
Marconi, Marcella; Ripepi, Vincenzo; Rejkuba, Marina +4 more
The Draco Dwarf spheroidal (dSph) galaxy is one of the nearest and the most dark-matter-dominated satellites of the Milky Way. We obtained multiepoch near-infrared (NIR, JHK s ) observations of the central region of Draco dSph covering a sky area of ∼21' × 21' using the WIRCam instrument at the 3.6 m Canada–France–Hawaii Telescope. Hom…
Confirming the evolution of the dust mass function in galaxies over the past 5 billion years
Dunne, L.; Maddox, S.; Smith, M. W. L. +3 more
The amount of evolution in the dust content of galaxies over the past 5 billion years of cosmic history is contested in the literature. Here, we present a far-infrared (FIR) census of dust based on a sample of 29 241 galaxies with redshifts ranging from