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A Measurement of the Black Hole Mass in NGC 1097 Using ALMA
Kohno, K.; Onishi, K.; Iguchi, S. +1 more
We present an estimate of the mass of the supermassive black hole (SMBH) in the nearby type-1 Seyfert galaxy NGC 1097 using Atacamma Large Millimeter/submillimeter Array (ALMA) observations of dense gas kinematics. Dense molecular gas dynamics are traced with HCN(J=1-0) and HC{{O}+}(J=1-0) emission lines. Assuming a host galaxy inclinat…
The JCMT Plane Survey: early results from the ℓ = 30° field
Martin, P. G.; Hill, T.; White, G. J. +55 more
We present early results from the JCMT (James Clerk Maxwell Telescope) Plane Survey (JPS), which has surveyed the northern inner Galactic plane between longitudes ℓ = 7° and ℓ = 63° in the 850-µm continuum with SCUBA-2 (Submm Common-User Bolometer Array 2), as part of the JCMT Legacy Survey programme. Data from the ℓ = 30° survey region, whi…
Cosmological constraints on deviations from Lorentz invariance in gravity and dark matter
Lesgourgues, J.; Audren, B.; Blas, D. +2 more
We consider a scenario where local Lorentz invariance is violated by the existence of a preferred time direction at every space-time point. This scenario can arise in the context of quantum gravity and its description at low energies contains a unit time-like vector field which parameterizes the preferred direction. The particle physics tests of L…
Interpreting Mars ionospheric anomalies over crustal magnetic field regions using a 2-D ionospheric model
Withers, Paul; Mendillo, Michael; Matta, Majd +1 more
spatially inhomogeneous, small-scale crustal magnetic fields of Mars influence the escape of planetary atmospheric species and the interaction of the solar wind with the ionosphere. Understanding the plasma response to crustal magnetic field regions can therefore provide insight to ionospheric structure and dynamics. To date, several localized spa…
Thermal evolution of Venus with argon degassing
O'Rourke, Joseph G.; Korenaga, Jun
Decades-old measurements of atmospheric and elemental surface composition constrain the history of Venus. In this study, we search for a model featuring continuous evolution in the stagnant-lid regime that predicts the present-day atmospheric mass of radiogenic argon and satisfies the other available constraints. For comparison, we also consider t…
Light Bridge in a Developing Active Region. II. Numerical Simulation of Flux Emergence and Light Bridge Formation
Toriumi, Shin; Cheung, Mark C. M.; Katsukawa, Yukio
Light bridges, the bright structure dividing umbrae in sunspot regions, show various activity events. In Paper I, we reported on an analysis of multi-wavelength observations of a light bridge in a developing active region (AR) and concluded that the activity events are caused by magnetic reconnection driven by magnetconvective evolution. The aim o…
Feedback from Mass Outflows in Nearby Active Galactic Nuclei. II. Outflows in the Narrow-line Region of NGC 4151
Fischer, Travis C.; Crenshaw, D. Michael; Schmitt, Henrique R. +1 more
We present a detailed study of active galactic nucleus feedback in the narrow-line region (NLR) of the Seyfert 1 galaxy NGC 4151. We illustrate the data and techniques needed to determine the mass outflow rate (\dot{M}out) and kinetic luminosity (L KE) of the outflowing ionized gas as a function of position in the NLR. We fin…
Star formation rates from young-star counts and the structure of the ISM across the NGC 346/N66 complex in the SMC
Bernard, J. -P.; Lebouteiller, V.; Madden, S. C. +21 more
The rate at which interstellar gas is converted into stars, and its dependence on environment, is one of the pillars on which our understanding of the visible Universe is build. We present a comparison of the surface density of young stars (Σ⋆) and dust surface density (Σdust) across NGC 346 (N66) in 115 independent pixels of…
Proper Motions and Trajectories for 16 Extreme Runaway and Hypervelocity Stars
Anderson, Jay; Bond, Howard E.; Geller, Margaret J. +3 more
We measure proper motions with the Hubble Space Telescope for 16 extreme radial velocity stars, mostly unbound B stars in the Milky Way halo. Twelve of these stars have proper motions statistically consistent with zero, and thus have radial trajectories statistically consistent with a Galactic center “hypervelocity star” origin. The trajectory of …
Galactic cold cores. V. Dust opacity
Bernard, J. -P.; Juvela, M.; Marshall, D. J. +13 more
Context. The project Galactic Cold Cores has carried out Herschel photometric observations of interstellar clouds where the Planck satellite survey has located cold and compact clumps. The sources represent different stages of cloud evolution from starless clumps to protostellar cores and are located in different Galactic environments.
Aims: …