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Testing the Fidelity of Simulations of Black Hole-Galaxy Coevolution at z ∼ 1.5 with Observations
Treu, Tommaso; Bhowmick, Aklant K.; Menci, N. +3 more
We examine the scaling relations between the mass of a supermassive black hole (SMBH) and its host galaxy properties at 1.2 < z <1.7 using both observational data and simulations. Recent measurements of 32 X-ray-selected, broad-line active galactic nuclei (AGNs) are compared with two independent state-of-the-art efforts, including the hydrod…
The XXL Survey. XL. Obscuration properties of red AGNs in XXL-N
Chiappetti, L.; Paltani, S.; Pierre, M. +6 more
The combination of optical and mid-infrared (MIR) photometry has been extensively used to select red active galactic nuclei (AGNs). Our aim is to explore the obscuration properties of these red AGNs with both X-ray spectroscopy and spectral energy distributions (SEDs). In this study, we re-visit the relation between optical/MIR extinction and X-ra…
MeerKAT's discovery of a radio relic in the bimodal merging cluster A2384
Kale, R.; Oozeer, N.; Parekh, V. +12 more
We present the discovery of a single radio relic located at the edge of the galaxy cluster A2384, using the MeerKAT radio telescope. A2384 is a nearby (z = 0.092), low-mass, complex bimodal, merging galaxy cluster that displays a dense X-ray filament (∼700 kpc in length) between A2384(N; northern cluster) and A2384(S; southern cluster). The origin…
XO-7 b: A Transiting Hot Jupiter with a Massive Companion on a Wide Orbit
Crouzet, Nicolas; Nielsen, Louise D.; Osborn, Hugh P. +16 more
Transiting planets orbiting bright stars are the most favorable targets for follow-up and characterization. We report the discovery of the transiting hot Jupiter XO-7 b and of a second, massive companion on a wide orbit around a circumpolar, bright, and metal-rich G0 dwarf (V = 10.52, {T}eff}=6250+/- 100 {{K}}, [{Fe}/{{H}}]=0.432+/- 0.0…
Joint XMM-Newton and NuSTAR observations of the reflection spectrum of III Zw 2
Savolainen, Tuomas; Chamani, Wara; Koljonen, Karri
Detecting and modeling the reprocessed hard X-ray emission component in the accretion flow, the so-called reflection spectrum, is a main tool used to estimate black hole spins in a wide range of astrophysical black holes, regardless of their mass or distance. In this work, we study the X-ray spectra of the Seyfert I galaxy III Zw 2 by using multie…
Mapping Circumstellar Magnetic Fields of Late-type Evolved Stars with the Goldreich-Kylafis Effect: CARMA Observations at λ1.3 mm of R Crt and R Leo
Lai, Shih-Ping; Agudo, Iván; Vlemmings, Wouter H. T. +3 more
Mapping magnetic fields is the key to resolving the unclear physical picture of circumstellar magnetic fields in late-type evolved stars. Observations of linearly polarized emission from thermal molecular line transitions due to the Goldreich-Kylafis (G-K) effect provide valuable insights into the magnetic field geometry in these sources that are …
Investigation of contact binaries in the field of NGC 6811
Liu, Liang; Li, Xu-Zhi; Zhang, Xu-Dong
Contact binary systems are very important for studying physical processes such as strong interactions between stars, mass transfer, and stellar merger. Further, the members of an open cluster have the same age, metal abundance, and interstellar extinction conditions. Therefore, we can conduct a comparative study on the different binary systems of …
The Bubble Nebula NGC 7635 - testing the wind-blown bubble theory
Chu, Y. -H.; Guerrero, M. A.; Toalá, J. A. +5 more
We present a multiwavelength study of the iconic Bubble Nebula (NGC 7635) and its ionizing star BD+60○2522. We obtained XMM-Newton EPIC X-ray observations to search for extended X-ray emission as in other similar wind-blown bubbles around massive stars. We also obtained San Pedro Mártir spectroscopic observations with the Manchester Ech…
Stellar laboratories. X. New Cu IV-VII oscillator strengths and the first detection of copper and indium in hot white dwarfs
Rauch, T.; Werner, K.; Kruk, J. W. +4 more
Context. Accurate atomic data is an essential ingredient for the calculation of reliable non-local thermodynamic equilibrium (NLTE) model atmospheres that are mandatory for the spectral analysis of hot stars.
Aims: We aim to search for and identify for the first time spectral lines of copper (atomic number Z = 29) and indium (Z = 49) in hot w…
Switches between accretion structures during flares in 4U 1901+03
Tsygankov, S.; Santangelo, A.; Zhang, Yi +125 more
We report on our analysis of the 2019 outburst of the X-ray accreting pulsar 4U 1901+03 observed with Insight-HXMT and NICER. Both spectra and pulse profiles evolve significantly in the decaying phase of the outburst. Dozens of flares are observed throughout the outburst. They are more frequent and brighter at the outburst peak. We find that the f…