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A new radio catalogue for M83: supernova remnants and H II regions
Soria, Roberto; White, Richard L.; Blair, William P. +3 more
We present a new catalogue of radio sources in the face-on spiral galaxy M83. Radio observations taken in 2011, 2015, and 2017 with the Australia Telescope Compact Array at 5.5 and 9 GHz have detected 270 radio sources. Although a small number of these sources are background extragalactic sources, most are either H II regions or supernova remnants…
Quantifying the structure of strong gravitational lens potentials with uncertainty-aware deep neural networks
Vernardos, Georgios; Tsagkatakis, Grigorios; Pantazis, Yannis
Gravitational lensing is a powerful tool for constraining substructure in the mass distribution of galaxies, be it from the presence of dark matter sub-haloes or due to physical mechanisms affecting the baryons throughout galaxy evolution. Such substructure is hard to model and is either ignored by traditional, smooth modelling, approaches, or tre…
The large-scale magnetic field of the eccentric pre-main-sequence binary system V1878 Ori
Hussain, G. A. J.; Alecian, E.; Kochukhov, O. +4 more
We report time-resolved, high-resolution optical spectropolarimetric observations of the young double-lined spectroscopic binary V1878 Ori. Our observations were collected with the ESPaDOnS spectropolarimeter at the Canada-France-Hawaii Telescope through the BinaMIcS large programme. V1878 Ori A and B are partially convective intermediate mass wea…
Tracking the year-to-year variation in the spectral energy distribution of the narrow-line Seyfert 1 galaxy Mrk 335
Komossa, S.; Gallo, L. C.; Grupe, D. +5 more
Multiwavelength monitoring of Mrk 335 with Swift between 2007 and 2019 are used to construct annual spectral energy distributions (SEDs) and track year-to-year changes. Non-contemporaneous archival data prior to 2007 are used to build a bright state SED. In this work, the changes are examined and quantified to build the foundation for future SED m…
Study of the low-order Δν-ρ¯ relation for moderately rotating δ Scuti stars and its impact on their characterization
Suárez, J. C.; García Hernández, A.; Rodón, J. R. +1 more
The large separation in the low-radial order regime is considered as a highly valuable observable to derive mean densities of δ Scuti stars, due to its independence with rotation. Up to now, theoretical studies of this Δν- ${\bar{\rho}}$ relation have been limited to 1D non-rotating models and 2D pseudo-evolutionary models. The present work aims a…
Two new double-lined spectroscopic binary white dwarfs
Bergeron, P.; Kilic, Mukremin; Bédard, A. +1 more
We present radial velocity observations of four binary white dwarf candidates identified through their overluminosity. We identify two new double-lined spectroscopic binary systems, WD 0311-649 and WD 1606+422, and constrain their orbital parameters. WD 0311-649 is a 17.7 h period system with a mass ratio of 1.44 ± 0.06 and WD 1606+422 is a 20.1 h…
Photometric rotation periods for 107 M dwarfs from the APACHE survey
Sozzetti, A.; Giacobbe, P.; Lattanzi, M. G. +13 more
We present rotation period measurements for 107 M dwarfs in the mass range 0.15-0.70 M_⊙ observed within the context of the APACHE photometric survey. We measure rotation periods in the range 0.5-190 d, with the distribution peaking at ∼30 d. We revise the stellar masses and radii for our sample of rotators by exploiting the Gaia DR2 data. For ∼20…
VLA and ALMA observations of the lensed radio-quiet quasar SDSS J0924+0219: a molecular structure in a 3 µJy radio source
Sluse, Dominique; Jackson, Neal; Stacey, Hannah +3 more
We present Karl G. Jansky Very Large Array (VLA) and Atacama Large Millimetre Array (ALMA) observations of SDSS J0924+0219, a z = 1.524 radio-quiet lensed quasar with an intrinsic radio flux density of about 3 $\, \mu$ Jy. The four lensed images are clearly detected in the radio continuum and the CO(5-4) line, whose centroid is at z = 1.5254 ± 0.0…
The dynamical state of Abell 2399: a bullet-like cluster
Moretti, A.; Vulcani, B.; Lopes, P. A. A. +8 more
While there are many ways to identify substructures in galaxy clusters using different wavelengths, each technique has its own caveat. In this paper, we conduct a detailed substructure search and dynamical state characterization of Abell 2399, a galaxy cluster in the local Universe (z ~ 0.0579), by performing a multiwavelength analysis and testing…
Resolved star formation in the metal-poor star-forming region Magellanic Bridge C
Bolatto, Alberto D.; Rubio, Monica; Kalari, Venu M. +1 more
Magellanic Bridge C (MB-C) is a metal-poor (∼1/5 Z⊙) low-density star-forming region located 59 kpc away in the Magellanic Bridge, offering a resolved view of the star formation process in conditions different to the Galaxy. From Atacama Large Millimetre Array CO (1-0) observations, we detect molecular clumps associated with candidate y…