Search Publications
Ion bulk speeds and temperatures in the diamagnetic cavity of comet 67P from RPC-ICA measurements
Nilsson, Hans; Stenberg Wieser, Gabriella; Wieser, Martin +6 more
Comets are constantly interacting with the solar wind. When the comet activity is high enough, this leads to the creation of a magnetic field free region around the nucleus known as the diamagnetic cavity. It has been suggested that the ion-neutral drag force is balancing the magnetic pressure at the cavity boundary, but after the visit of Rosetta…
Proper motion measurements for stars up to 100 kpc with Subaru HSC and SDSS Stripe 82
Wang, Wenting; Komiyama, Yutaka; Takada, Masahiro +6 more
We present proper motion measurements for more than 0.55 million main-sequence stars, by comparing astrometric positions of matched stars between the multiband imaging data sets from the Hyper Suprime-Cam (HSC) Survey and the Sloan Digital Sky Survey (SDSS) Stripe 82. In doing this, we use 3 million galaxies to recalibrate the astrometry and set u…
Photometric redshifts in the North Ecliptic Pole Wide field based on a deep optical survey with Hyper Suprime-Cam
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +13 more
The AKARI space infrared telescope has performed near-infrared to mid-infrared (MIR) observations on the North Ecliptic Pole Wide (NEPW) field (5.4 deg2) for about 1 yr. AKARI took advantage of its continuous nine photometric bands, compared with NASA's Spitzer and Wide-field Infrared Survey Explorer(WISE) space telescopes, which had on…
Hubble Space Telescope [O III] emission-line kinematics in two nearby QSO2s: a case for X-ray feedback
Turner, T. J.; Kraemer, S. B.; Crenshaw, D. M. +15 more
We present a dynamical study of the narrow-line regions in two nearby type 2 quasars (QSO2s). We construct dynamical models based on detailed photoionization models of the emission-line gas, including the effects of internal dust, to apply to observations of large-scale outflows from these active galactic nuclei (AGNs). We use Mrk 477 and Mrk 34 i…
Active gas features in three HSC-SSP CAMIRA clusters revealed by high angular resolution analysis of MUSTANG-2 SZE and XXL X-ray observations
Kohno, Kotaro; Oguri, Masamune; Mroczkowski, Tony +33 more
We present results from simultaneous modelling of high angular resolution GBT/MUSTANG-2 90 GHz Sunyaev-Zel'dovich effect (SZE) measurements and XMM-XXL X-ray images of three rich galaxy clusters selected from the HSC-SSP Survey. The combination of high angular resolution SZE and X-ray imaging enables a spatially resolved multicomponent analysis, w…
Chemical abundances in Seyfert galaxies - VII. Direct abundance determination of neon based on optical and infrared emission lines
Feltre, Anna; Dors, O. L.; Hägele, G. F. +6 more
For the first time, neon abundance has been derived in the narrow line region from a sample of Seyfert 2 nuclei. In view of this, we compiled from the literature fluxes of optical and infrared (IR) narrow emission lines for 35 Seyfert 2 nuclei in the local universe ($z \:\lesssim \:0.06$). The relative intensities of emission lines were used to de…
Anomalous gas in ESO 149-G003: a MeerKAT-16 view
Józsa, Gyula I. G.; Wang, Jing; Paterson, Kerry +28 more
ESO 149-G003 is a close-by, isolated dwarf irregular galaxy. Previous observations with the ATCA indicated the presence of anomalous neutral hydrogen ( $\rm{H{\small I}}$ ) deviating from the kinematics of a regularly rotating disc. We conducted follow-up observations with the MeerKAT radio telescope during the 16-dish Early Science programme as w…
Exploring the planetary-mass population in the Upper Scorpius association
Hambly, N. C.; Lodieu, N.; Cross, N. J. G.
We aim at identifying very low-mass isolated planetary-mass member candidates in the nearest OB association to the Sun, Upper Scorpius (USco) (145 pc; 5-10 Myr), to constrain the form and shape of the luminosity function and mass spectrum in this regime. We conducted a deep multiband (Y = 21.2, J = 20.5, Z = 22.0 mag) photometric survey of 6 deg
Searching for energy-resolved quasi-periodic oscillations in AGN
Middleton, Matthew J.; Ashton, Dominic I.
X-ray quasi-periodic oscillations (QPOs) in active galactic nucleus (AGN) allow us to probe and understand the nature of accretion in highly curved space-time, yet the most robust form of detection (i.e. repeat detections over multiple observations) has been limited to a single source to-date, with only tentative claims of single observation detec…
Modes of a stellar system I: Ergodic systems
Binney, James; Lau, Jun Yan
The excursions of star clusters and galaxies around statistical equilibria are studied. For a stable ergodic model Antonov's Hermitian operator on six-dimensional phase space has the normal modes as its eigenfunctions. The excitation energy of the system is just the sum of the (positive) energies associated with each normal mode. Formulae are give…