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I Zw 1 and H0557-385: the dusty tori of two high Eddington AGNs observed in the MATISSE LM bands
Kishimoto, Makoto; Drewes, Farin; Leftley, James H. +2 more
The torus in active galactic nuclei (AGNs) is a complex dynamical structure of gas and dust. It is thought to be composed of an equatorial dusty disc and a polar dusty wind launched by radiation pressure. However, this picture is based on studies of moderately accreting AGN. Models suggest that the disc/wind structure will change with specific acc…
Detecting eclipsing double white dwarfs with electromagnetic and gravitational waves
Shao, Yong; Ma, Bo; Wang, Yan +1 more
Galactic double white dwarfs (DWDs) are predominant sources of gravitational waves in the millihertz frequencies accessible to space-borne gravitational wave (GW) detectors. With advances in multimessenger astronomy, an increasing number of DWD systems will be discovered through both electromagnetic (EM) and GW observations. In this paper, we simu…
The Mega-MUSCLES Treasury Survey: X-Ray to Infrared Spectral Energy Distributions of a Representative Sample of M Dwarfs
Loyd, R. O. Parke; Redfield, Seth; Roberge, Aki +15 more
We present 5–1 × 107 Å spectral energy distributions (SEDs) for 12 M dwarf stars covering spectral types M0–M8. Our SEDs are provided for community use as a sequel to the Measurements of the Ultraviolet Spectral Characteristics of Low-mass Exoplanetary Systems (MUSCLES) survey. The 12 stars include eight known exoplanet hosts and four s…
Recent star formation episodes in the Galaxy: Impact on its chemical properties and the evolution of its abundance gradient
Prantzos, Nikos; Chen, Tianxiang
Aims. We investigate the chemical evolution of the Milky Way disc exploring various schemes of recent (past several Gyr) star formation episodes, as reported in recent observational works. Methods. We used a semi-analytical model with parametrized radial migration, and we introduced Gaussian star formation episodes constrained by the recent observ…
Radial evolution of interplanetary coronal mass ejection-associated particle acceleration observed by Solar Orbiter and ACE
Li, Gang; Kouloumvakos, Athanasios; Wimmer-Schweingruber, Robert F. +5 more
On 2022 March 10 a coronal mass ejection erupted from the Sun, resulting in Solar Orbiter observations at 0.45 au of both dispersive solar energetic particles arriving prior to the interplanetary coronal mass ejection (ICME) and locally accelerated particles near the ICME-associated shock structure as it passed the spacecraft on 2022 March 11. Thi…
Observations of Microlensed Images with Dual-field Interferometry: On-sky Demonstration and Prospects
Mérand, Antoine; Kreidberg, Laura; Han, Cheongho +61 more
Interferometric observations of gravitational microlensing events offer an opportunity for precise, efficient, and direct mass and distance measurements of lensing objects, especially those of isolated neutron stars and black holes. However, such observations have previously been possible for only a handful of extremely bright events. The recent d…
Cosmic rays cannot explain the high ionisation rates in the Galactic centre
Gabici, S.; Recchia, S.; Ravikularaman, S. +1 more
Context. The H2 ionisation rate in the central molecular zone, located in the Galactic centre, is estimated to be ζ ∼ 2 × 10‑14 s‑1, based on observations of H3+ lines. This value is two to three orders of magnitude larger than that measured anywhere else in the Galaxy. Aims. Due to the high d…
On the Abiotic Origin of Dimethyl Sulfide: Discovery of Dimethyl Sulfide in the Interstellar Medium
Caselli, Paola; Martín, Sergio; Jiménez-Serra, Izaskun +14 more
Following the discovery of dimethyl sulfide (DMS; CH3SCH3) signatures in comet 67P/Churyumov–Gerasimenko, we report the first detection of this organosulfur species in the interstellar medium during the exploration of an ultradeep molecular line survey performed toward the Galactic center molecular cloud G+0.693-0.027 with th…
Probing X-Ray Timing and Spectral Variability in the Blazar PKS 2155–304 over a Decade of XMM-Newton Observations
Mohorian, Maksym; Bhatta, Gopal; Adhikari, Tek P. +6 more
Blazars, a class of active galactic nuclei (AGN) powered by supermassive black holes, are known for their remarkable variability across multiple timescales and wavelengths. Despite significant advancements in our understanding of AGN central engines, thanks to both ground- and space-based telescopes, the details of the mechanisms driving this vari…
X-ray AGN in Boötes: the lack of growth of the most massive black holes since z = 4
Aird, James; Terrazas, Bryan A.; Coil, Alison L. +5 more
Supermassive black holes (BHs) are known to efficiently grow through gas accretion, but even sustained and intense mass build-up through this mechanism struggles to explain the assembly of the most massive BHs observed in the local Universe. Using the Chandra Deep-Wide Field Survey (CDFWS) in the Boötes field, we measure BH-galaxy assembly in mass…