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Significant Suppression of Star Formation in Radio-quiet AGN Host Galaxies with Kiloparsec-scale Radio Structures
Koss, Michael; Ricci, Claudio; Mushotzky, Richard +4 more
We conducted 22 GHz 1″ Jansky Very Large Array imaging of 100 radio-quiet X-ray-selected active galactic nuclei (AGN) from the Swift-Burst Array Telescope (Swift-BAT) survey. We find AGN-driven kiloparsec-scale radio structures inconsistent with pure star formation in 11 AGN. The host galaxies of these AGN lie significantly below the star-forming …
Predicting the dark matter velocity distribution in galactic structures: tests against hydrodynamic cosmological simulations
Lacroix, Thomas; Stref, Martin; Lavalle, Julien +2 more
Reducing theoretical uncertainties in Galactic dark matter (DM) searches is an important challenge as several experiments are now delving into the parameter space relevant to popular (particle or not) candidates. Since many DM signal predictions rely on the knowledge of the DM velocity distribution—direct searches, capture by stars, p-wave-suppres…
Origin of spin-orbit misalignments: the microblazar V4641 Sgr
Salvesen, Greg; Pokawanvit, Supavit
Of the known microquasars, V4641 Sgr boasts the most severe lower limit (>52°) on the misalignment angle between the relativistic jet axis and the binary orbital angular momentum. Assuming the jet and black hole spin axes coincide, we attempt to explain the origin of this extreme spin-orbit misalignment with a natal kick model, whereby an align…
Planet-induced spirals in the circumbinary disk of GG Tauri A
Chapillon, E.; Beck, T. L.; Guilloteau, S. +10 more
Context. ALMA high angular resolution observations of the dust and CO emission have already revealed signatures of protoplanets embedded in protoplanetary disks. These detections are around single T Tauri stars, while exoplanet surveys reveal that planets can also form in binary (or multiple) systems, either in circumstellar or circumbinary orbits…
Swift UVOT grism observations of nearby Type Ia supernovae - II. Probing the progenitor metallicity of SNe Ia with ultraviolet spectra
Filippenko, A. V.; Foley, R. J.; Kuin, N. P. M. +2 more
Ultraviolet (UV) observations of Type Ia supernovae (SNe Ia) are crucial for constraining the properties of their progenitor systems. Theoretical studies predicted that the UV spectra, which probe the outermost layers of an SN, should be sensitive to the metal content of the progenitor. Using the largest SN Ia UV (λ < 2900 Å) spectroscopic samp…
When do solar erupting hot magnetic flux ropes form?
Cheng, X.; Zhang, J.; Patsourakos, S. +2 more
Aims: We investigate the formation times of eruptive magnetic flux ropes relative to the onset of solar eruptions, which is important for constraining models of coronal mass ejection (CME) initiation.
Methods: We inspected uninterrupted sequences of 131 Å images that spanned more than eight hours and were obtained by the Atmospheric Imag…
Maximum entropy estimation of the Galactic bulge morphology via the VVV Red Clump
Coleman, B.; Paterson, D.; Gordon, C. +2 more
The abundance and narrow magnitude dispersion of Red Clump (RC) stars make them a popular candidate for mapping the morphology of the bulge region of the Milky Way. Using an estimate of the RC's intrinsic luminosity function, we extracted the three-dimensional density distribution of the RC from deep photometric catalogues of the VISTA Variables i…
Interstellar oxygen along the line of sight of Cygnus X-2
Waters, L. B. F. M.; Mutschke, H.; Costantini, E. +7 more
Interstellar dust permeates our Galaxy and plays an important role in many physical processes in the diffuse and dense regions of the interstellar medium (ISM). High-resolution X-ray spectroscopy, coupled with modelling based on laboratory dust measurements, provides a unique probe for investigating the interstellar dust properties along our line …
Modeling the Precession of the Warped Inner Accretion Disk in the Pulsars LMC X-4 and SMC X-1 with NuSTAR and XMM-Newton
Pottschmidt, Katja; Wilms, Jörn; Hickox, Ryan C. +3 more
We present a broadband X-ray study of the effect of superorbital periods on X-ray spectra and pulse profiles in the neutron star X-ray binaries LMC X-4 and SMC X-1. These two sources display periodic or quasiperiodic variations in luminosity of the order of tens of days, which are known to be superorbital, and are attributed to warped, precessing …
It Takes Two Planets in Resonance to Tango around K2-146
Cochran, William D.; Endl, Michael; Mahadevan, Suvrath +51 more
K2-146 is a cool, 0.358 ${M}_{\odot }$ dwarf that was found to host a mini-Neptune with a 2.67 day period. The planet exhibited strong transit timing variations (TTVs) of greater than 30 minutes, indicative of the presence of an additional object in the system. Here we report the discovery of the previously undetected outer planet in the system, K…