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The post-Herschel view of intrinsic AGN emission: constructing templates for galaxy and AGN emission at IR wavelengths
Alexander, D. M.; Mullaney, J. R.; Rosario, D. J. +3 more
Measuring the star-forming properties of active galactic nucleus (AGN) hosts is key to our understanding of galaxy formation and evolution. However, this topic remains debated, partly due to the difficulties in separating the infrared (i.e. 1-1000 ${\rm \mu m}$) emission into AGN and star-forming components. Taking advantage of archival far-infrar…
Testing the fossil field hypothesis: could strongly magnetized OB stars produce all known magnetars?
Igoshev, Andrei P.; Kholtygin, A. F.; Makarenko, Ekaterina I.
Stars of spectral types O and B produce neutron stars (NSs) after supernova explosions. Most of NSs are strongly magnetized including normal radio pulsars with B ∝ 1012 G and magnetars with B ∝ 1014 G. A fraction of 7-12 per cent of massive stars are also magnetized with B ∝ 103 G and some are weakly magnetized wit…
The Remarkable Spin-down and Ultrafast Outflows of the Highly Pulsed Supersoft Source of Nova Herculis 2021
Luna, G. J. M.; Singh, K. P.; Drake, Jeremy J. +12 more
Nova Her 2021 (V1674 Her), which erupted on 2021 June 12, reached naked-eye brightness and has been detected from radio to γ-rays. An extremely fast optical decline of 2 magnitudes in 1.2 days and strong Ne lines imply a high-mass white dwarf. The optical pre-outburst detection of a 501.42 s oscillation suggests a magnetic white dwarf. This is the…
A Large Population of Luminous Active Galactic Nuclei Lacking X-Ray Detections: Evidence for Heavy Obscuration?
Stern, Daniel; Hickox, Ryan C.; Assef, Roberto J. +5 more
We present a large sample of infrared-luminous candidate active galactic nuclei (AGNs) that lack X-ray detections in Chandra, XMM-Newton, and NuSTAR fields. We selected all optically detected SDSS sources with redshift measurements, combined additional broadband photometry from WISE, UKIDSS, 2MASS, and GALEX, and modeled the spectral energy distri…
Probing protoplanetary disk evolution in the Chamaeleon II region
Pinte, C.; Ménard, F.; Dent, W. R. F. +13 more
Context. Characterizing the evolution of protoplanetary disks is necessary to improve our understanding of planet formation. Constraints on both dust and gas are needed to determine the dominant disk dissipation mechanisms.
Aims: We aim to compare the disk dust masses in the Chamaeleon II (Cha II) star-forming region with other regions with a…
Unveiling the nature of 11 dusty star-forming galaxies at the peak of cosmic star formation history
Cimatti, A.; Pozzi, F.; Danese, L. +9 more
We present a panchromatic study of 11 (sub-)millimetre selected DSFGs with spectroscopically confirmed redshift (1.5 < zspec < 3) in the GOODS-S field, with the aim of constraining their astrophysical properties (e.g. age, stellar mass, dust, and gas content) and characterizing their role in the context of galaxy evolution. The mu…
WISDOM project - VI. Exploring the relation between supermassive black hole mass and galaxy rotation with molecular gas
Sarzi, Marc; Cappellari, Michele; Davis, Timothy A. +6 more
Empirical correlations between the masses of supermassive black holes (SMBHs) and properties of their host galaxies are well established. Among these is the correlation with the flat rotation velocity of each galaxy measured either at a large radius in its rotation curve or via a spatially integrated emission-line width. We propose here the use of…
Comparison of Observed Galaxy Properties with Semianalytic Model Predictions Using Machine Learning
Mobasher, Bahram; Chartab, Nima; Lu, Yu +1 more
With current and upcoming experiments such as the Wide Field Infrared Survey Telescope, Euclid, and Large Synoptic Survey Telescope, we can observe up to billions of galaxies. While such surveys cannot obtain spectra for all observed galaxies, they produce galaxy magnitudes in color filters. This data set behaves like a high-dimensional nonlinear …
Radial evolution of the April 2020 stealth coronal mass ejection between 0.8 and 1 AU. Comparison of Forbush decreases at Solar Orbiter and near the Earth
Dumbović, Mateja; Möstl, Christian; Davies, Emma E. +40 more
Aims: We present observations of the first coronal mass ejection (CME) observed by the Solar Orbiter spacecraft on April 19, 2020 and the associated Forbush decrease (FD) measured by the High Energy Telescope (HET). This CME is a multi-spacecraft event that was also seen near Earth the following day.
Methods: We highlight the capabilitie…
Investigating Remote-sensing Techniques to Reveal Stealth Coronal Mass Ejections
Nitta, Nariaki V.; Richardson, Ian G.; Srivastava, Nandita +7 more
Eruptions of coronal mass ejections (CMEs) from the Sun are usually associated with a number of signatures that can be identified in solar disc imagery. However, there are cases in which a CME that is well observed in coronagraph data is missing a clear low-coronal counterpart. These events have received attention during recent years, mainly as a …