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The AGN fuelling/feedback cycle in nearby radio galaxies - III. 3D relative orientations of radio jets and CO discs and their interaction
Davis, Timothy A.; Bureau, Martin; Paladino, Rosita +4 more
This is the third paper of a series exploring the multifrequency properties of a sample of eleven nearby low-excitation radio galaxies (LERGs) in the southern sky. We are conducting an extensive study of different galaxy components (stars, dust, warm and cold gas, radio jets) with the aim of better understanding the AGN fuelling/feedback cycle in …
Helium abundances and its radial gradient from the spectra of H II regions and ring nebulae of the Milky Way
Méndez-Delgado, J. E.; Arellano-Córdova, K. Z.; García-Rojas, J. +2 more
We determine the radial abundance gradient of helium in the disc of the Galaxy from published spectra of 19 H II regions and ring nebulae surrounding massive O-type stars. We revise the Galactocentric distances of the objects considering Gaia DR2 parallaxes (Gaia Collaboration 2018) and determine the physical conditions and the ionic abundance of …
The SOFIA Massive (SOMA) Star Formation Survey. III. From Intermediate- to High-mass Protostars
Yang, Yao-Lun; Tanaka, Kei E. I.; Zhang, Yichen +9 more
We present $\sim 10\mbox{--}40\,\mu {\rm{m}}$ SOFIA-FORCAST images of 14 intermediate-mass protostar candidates as part of the SOFIA Massive (SOMA) Star Formation Survey. We build spectral energy distributions, also using archival Spitzer, Herschel, and IRAS data. We then fit the spectral energy distributions with radiative transfer models of Zhan…
Heating at the Remote Footpoints as a Brake on Jet Flows along Loops in the Solar Atmosphere
Fu, Hui; Li, Bo; Xia, Lidong +3 more
We report on observations of a solar jet propagating along coronal loops taken by the Solar Dynamics Observatory, the Interface Region Imaging Spectrograph, and the 1 m New Vacuum Solar Telescope. The ejecta of the jet consist of multithermal components and propagate with a speed greater than 100 km s-1. Brightenings are found in the re…
Simultaneous Millimetre-wave and X-ray monitoring of the Seyfert galaxy NGC 7469
Kaspi, Shai; Laor, Ari; Mehdipour, Missagh +6 more
We report on daily monitoring of the Seyfert galaxy NGC 7469, around 95 and 143 GHz, with the IRAM (Institut de Radioastronomie Millimetrique) 30- m radio telescope, and with the Swift X-ray and UV/optical telescopes, over an overlapping period of 45 d. The source was observed on 36 d with IRAM, and the flux density in both mm bands was on average…
The X-ray emissivity of low-density stellar populations
van den Berg, M.; Heinke, C. O.; Cohn, H. N. +17 more
The dynamical production of low-mass X-ray binaries and brighter cataclysmic variables (CVs) in dense globular clusters is well-established. We investigate how the X-ray emissivity of fainter X-ray binaries (principally CVs and coronally active binaries) varies between different environments. We compile calculations (largely from the literature) o…
Impact of the reflection model on the estimate of the properties of accreting black holes
Tripathi, Ashutosh; Bambi, Cosimo; Liu, Honghui
Relativistic reflection features in the X-ray spectra of black hole binaries and active galactic nuclei originate from illumination of the inner part of the accretion disc by a hot corona. In the presence of high quality data and with the correct astrophysical model, X-ray reflection spectroscopy can be quite a powerful tool to probe the strong gr…
A Study of the Blue Straggler Population of the Old Open Cluster Collinder 261
Monaco, L.; Beccari, G.; Villanova, S. +4 more
Blue stragglers (BSs) are stars located in an unexpected region of the color-magnitude diagram (CMD) of a stellar population, as they appear bluer and more luminous than the stars in the turn-off region. They are ubiquitous, since they have been found among Milky Way field stars, in open and globular clusters, and also in other galaxies of the Loc…
A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE). VII. Bridging the cluster-ICM-galaxy evolution at small scales
Andreani, P.; Ferrarese, L.; Buat, V. +20 more
Aims: We measure far-infrared (FIR) emission from tails of stripped dust following the ionised and atomic gas components in galaxies undergoing ram pressure stripping. We study the dust-to-gas relative distribution and mass ratio in the stripped interstellar medium and relate them to those of the intra-cluster medium (ICM), thus linking the c…
Multiwavelength power-spectrum analysis of NGC 5548
Papadakis, I. E.; Dovčiak, M.; Kammoun, E. S. +1 more
NGC 5548 was recently monitored intensively from NIR to X-rays as part of the STORM campaign. Its disc emission was found to lag behind the observed X-rays, while the measured time lag was increasing with wavelength. These results are consistent with the assumption that short-term variability in AGN emission is driven by the X-ray illumination of …