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Observational consequences of optical band milliarcsec-scale structure in active galactic nuclei discovered by Gaia
Petrov, L.; Kovalev, Y. Y.
We interpret the recent discovery of a preferred very long baseline interferometry (VLBI)/Gaia offset direction for radio-loud active galactic nuclei (AGNs) along pc-scale radio jets as a manifestation of their optical structure on scales of 1-100 milliarcsec (mas). The extended jet structure affects the Gaia position more strongly than the VLBI p…
The HIP 79977 debris disk in polarized light
Ménard, F.; Quanz, S. P.; Siebenmorgen, R. +40 more
Context. Debris disks are observed around 10 to 20% of FGK main-sequence stars as infrared excess emission. They are important signposts for the presence of colliding planetesimals and therefore provide important information about the evolution of planetary systems. Direct imaging of such disks reveals their geometric structure and constrains thei…
Haro 11: Where is the Lyman Continuum Source?
Jaskot, Anne E.; James, Bethan L.; Oey, M. S. +1 more
Identifying the mechanism by which high-energy Lyman continuum (LyC) photons escaped from early galaxies is one of the most pressing questions in cosmic evolution. Haro 11 is the best known local LyC-leaking galaxy, providing an important opportunity to test our understanding of LyC escape. The observed LyC emission in this galaxy presumably origi…
The Lyman continuum escape and ISM properties in Tololo 1247-232 - new insights from HST and VLA★
Östlin, G.; Hayes, M.; Zackrisson, E. +7 more
Low- and intermediate-mass galaxies are widely discussed as cause of reionization at redshift z ∼ 10-6. However, observational proof of galaxies that are leaking ionizing radiation (Lyman continuum; LyC) is a currently ongoing challenge and the list of LyC emitting candidates is still short. Tololo 1247-232 is among those very few galaxies with re…
A long-term study of AGN X-ray variability . Structure function analysis on a ROSAT-XMM quasar sample
Bianchi, S.; Paolillo, M.; Middei, R. +3 more
Context. Variability in the X-rays is a key ingredient in understanding and unveiling active galactic nuclei (AGN) properties. In this band, flux variations occur on short timescales (hours) as well as on larger timescales. While short timescale variability is often investigated in single source studies, only a few works are able to explore flux v…
Ionized Gas Outflows in Infrared-bright Dust-obscured Galaxies Selected with WISE and SDSS
Toba, Yoshiki; Nagao, Tohru; Wang, Wei-Hao +5 more
We present the ionized gas properties of infrared (IR)-bright dust-obscured galaxies (DOGs) that show an extreme optical/IR color, {(i-[22])}{AB}> 7.0, selected with the Sloan Digital Sky Survey (SDSS) and Wide-field Infrared Survey Explorer (WISE). For 36 IR-bright DOGs that show [O III]λ5007 emission in the SDSS spectra, we perform…
A detection of wobbling brightest cluster galaxies within massive galaxy clusters
Kneib, J. P.; Harvey, David; Courbin, F. +1 more
A striking signal of dark matter beyond the standard model is the existence of cores in the centre of galaxy clusters. Recent simulations predict that a brightest cluster galaxy (BCG) inside a cored galaxy cluster will exhibit residual wobbling due to previous major mergers, long after the relaxation of the overall cluster. This phenomenon is abse…
Testing giant planet formation in the transitional disk of SAO 206462 using deep VLT/SPHERE imaging
Quanz, S. P.; Henning, T.; Ginski, C. +42 more
Context. The SAO 206462 (HD 135344B) disk is one of the few known transitional disks showing asymmetric features in scattered light and thermal emission. Near-infrared scattered-light images revealed two bright outer spiral arms and an inner cavity depleted in dust. Giant protoplanets have been proposed to account for the disk morphology.
Aim…
First Results from the KMOS Lens-Amplified Spectroscopic Survey (KLASS): Kinematics of Lensed Galaxies at Cosmic Noon
Fontana, Adriano; Schmidt, Kasper B.; Treu, Tommaso +12 more
We present the first results of the K-band Multi-Object Spectrometer (KMOS) Lens-Amplified Spectroscopic Survey, a new ESO Very Large Telescope large program, doing multi-object integral field spectroscopy of galaxies gravitationally lensed behind seven galaxy clusters selected from the Hubble Space Telescope (HST) Grism Lens-Amplified Survey from…
A novel approach to quantifying the sensitivity of current and future cosmological datasets to the neutrino mass ordering through Bayesian hierarchical modeling
Mena, Olga; Gerbino, Martina; Lattanzi, Massimiliano +1 more
We present a novel approach to derive constraints on neutrino masses, as well as on other cosmological parameters, from cosmological data, while taking into account our ignorance of the neutrino mass ordering. We derive constraints from a combination of current as well as future cosmological datasets on the total neutrino mass Mν and on…