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Multiple AGN activity during the BCG assembly of XDCPJ0044.0-2033 at z ∼ 1.6
Fiore, F.; Piconcelli, E.; Tozzi, P. +13 more
Undisturbed galaxy clusters are characterized by a massive and large elliptical galaxy at their centre, i.e. the brightest cluster galaxy (BCG). How these central galaxies form is still debated. According to most models, a typical epoch for their assembly is $z$ ∼ 1-2. We have performed a detailed multiwavelength analysis of the core of XMM-Newton…
Searching for obscured AGN in z ∼ 2 submillimetre galaxies
Guidetti, D.; Bondi, M.; Prandoni, I. +13 more
Aims: Submillimetre-selected galaxies (SMGs) at high redshift (z ∼ 2) are potential host galaxies of active galactic nuclei (AGN). If the local Universe is a good guide, ∼50% of the obscured AGN amongst the SMG population could be missed even in the deepest X-ray surveys. Radio observations are insensitive to obscuration; therefore, very long…
The flux-weighted gravity-luminosity relation of Galactic classical Cepheids
Groenewegen, M. A. T.
The flux-weighted gravity-luminosity relation (FWGLR) is investigated for a sample of 477 classical Cepheids (CCs), including stars that have been classified in the literature as such but are probably not. The luminosities are taken from the literature, based on the fitting of the spectral energy distributions (SEDs) assuming a certain distance an…
Hα Kinematics of the Isolated Interacting Galaxy Pair KPG 486 (NGC 6090)
Rosado, M.; Sánchez-Cruces, M.; Sardaneta, M. M.
In optical images, the barely studied isolated interacting galaxy pair KPG 486 (NGC 6090) displays similar features to the Antennae (NGC 4038/39) galaxy pair. To compare the distribution of ionized hydrogen gas, morphology and kinematic and dynamic behaviour of both galaxy pairs, we present observations in the Hα emission line of NGC 6090 acquired…
A Solar Magnetic-fan Flaring Arch Heated by Nonthermal Particles and Hot Plasma from an X-Ray Jet Eruption
Lee, Kyoung-Sun; Hara, Hirohisa; Panesar, Navdeep K. +10 more
We have investigated an M1.3 limb flare, which develops as a magnetic loop/arch that fans out from an X-ray jet. Using Hinode/EIS, we found that the temperature increases with height to a value of over 107 K at the loop top during the flare. The measured Doppler velocity (redshifts of 100-500 km s-1) and the nonthermal veloci…
A Herschel Mapping of [{C}{II}],[{O}{I}], and [{O}{III}] Lines from the Circumnuclear Region of M31
Smith, Matthew W. L.; Gao, Yu; Li, Zhiyuan +1 more
The circumnuclear region of M31, consisting of multiphase interstellar media, provides a close-up view of the interaction of the central supermassive black hole and surrounding materials. Far-infrared (FIR) fine-structure lines and their flux ratios can be used as diagnostics of physical properties of the neutral gas in this region. Here we presen…
Search for non-thermal X-ray emission in the colliding wind binary Cygnus OB2 #8A
Nazé, Y.; Rauw, G.; Pittard, J. M. +1 more
Aims: Cyg OB2 #8A is a massive O-type binary displaying strong non-thermal radio emission. Owing to the compactness of this binary, emission of non-thermal X-ray photons via inverse Compton scattering is expected.
Methods: We first revised the orbital solution for Cyg OB2 #8A using new optical spectra. We then reduced and analysed X-ray …
Wray 15-906: a candidate luminous blue variable discovered with WISE, Herschel, and SALT
Berdnikov, L. N.; Gvaramadze, V. V.; Kniazev, A. Y. +1 more
We present the results of study of the Galactic candidate luminous blue variable Wray 15-906, revealed via detection of its infrared circumstellar shell (of ≈2 pc in diameter) with the Wide-field Infrared Survey Explorer and the Herschel Space Observatory. Using the stellar atmosphere code CMFGEN and the Gaia parallax, we found that Wray 15-906 is…
Testing massive star evolution, star-formation history, and feedback at low metallicity. Photometric analysis of OB stars in the SMC Wing
Hamann, Wolf-Rainer; Gallagher, John S.; Ramachandran, Varsha +2 more
Context. The supergiant ionized shell SMC-SGS 1 (DEM 167), which is located in the outer Wing of the Small Magellanic Cloud (SMC), resembles structures that originate from an energetic star-formation event and later stimulate star formation as they expand into the ambient medium. However, stellar populations within and surrounding SMC-SGS 1 tell a…
Spatially resolving the chemical composition of the planet building blocks
Matter, A.; Lopez, B.; Pignatale, F. C.
The inner regions of protoplanetary discs (from ∼0.1 to 10 au) are the expected birthplace of planets, especially telluric. In those high-temperature regions, solids can experience cyclical annealing, vapourisation, and recondensation. Hot and warm dusty grains emit mostly in the infrared domain, notably in N-band (8-13 µm). Studying their f…