Search Publications
Improving the Flux Calibration in Reverberation Mapping by Spectral Fitting:Application to the Seyfert Galaxy MCG-6-30-15
Ho, Luis C.; Du, Pu; Hu, Chen +4 more
We propose a method for the flux calibration of reverberation mapping spectra, based on accurate measurement of [O III] λ5007 emission by spectral fitting. Our method can achieve better accuracy than the traditional method of Groningen & Wanders, allowing reverberation mapping measurements for objects with variability amplitudes as low as ∼5%.…
Hard X-Ray Emissions from Cassiopeia A Observed by INTEGRAL
Wang, Wei; Li, Zhuo
Cassiopeia A (Cas A), as the nearby young remnant of a core-collapse supernova, is the best candidate for astrophysical studies in supernova explosion and its environment. We studied the hard X-ray emission from Cas A using the 10 year data of INTEGRAL observations, and first detected non-thermal continuum emission from the source up to 220 keV. T…
Ionized gas kinematics within the inner kiloparsec of the Seyfert galaxy NGC 1365
Robinson, Andrew; Schnorr-Müller, Allan; Storchi-Bergmann, Thaisa +3 more
We observed the nuclear region of the galaxy NGC 1365 with the integral field unit of the Gemini Multi Object Spectrograph mounted on the GEMINI-South telescope. The field of view covers 13 × 6 arcsec2(1173 × 541 pc2) centred on the nucleus, at a spatial resolution of 52 pc. The spectral coverage extends from 5600 to 7000 Å, …
The clustering evolution of dusty star-forming galaxies
Baugh, Carlton M.; Cole, Shaun; Lacey, Cedric G. +1 more
We present predictions for the clustering of galaxies selected by their emission at far-infrared (FIR) and sub-millimetre wavelengths. This includes the first predictions for the effect of clustering biases induced by the coarse angular resolution of single-dish telescopes at these wavelengths. We combine a new version of the GALFORM model of gala…
MHD-Kinetic Transition in Imbalanced Alfvénic Turbulence
De Keyser, Johan; Voitenko, Yuriy
Alfvénic turbulence in space is usually imbalanced: amplitudes of waves propagating parallel and anti-parallel to the mean magnetic field {{\boldsymbol{B}}}0 are unequal. It is commonly accepted that the turbulence is driven by (counter-)collisions between these counter-propagating wave fractions. Contrary to this, we found a new ion-sc…
Ionospheric loss from Mars as predicted by hybrid particle simulations
Brecht, Stephen H.; Ledvina, Stephen A.; Bougher, Stephen W.
This paper reports the results of hybrid simulations of the Mars-solar wind interaction. The focus is on the loss rates of O+ and O2+ from the Martian ionosphere while examining the importance of including 3-D dimensional neutral atmospheres with their associated neutral winds. The simulation loss rates are found t…
The overmassive black hole in NGC 1277: new constraints from molecular gas kinematics
Krips, M.; Combes, F.; Scharwächter, J. +2 more
We report the detection of CO(1-0) emission from NGC 1277, a lenticular galaxy in the Perseus Cluster. NGC 1277 has previously been proposed to host an overmassive black hole (BH) compared to the galaxy bulge luminosity (mass), based on stellar-kinematic measurements. The CO(1-0) emission, observed with the IRAM Plateau de Bure Interferometer (PdB…
A Search for Short-period Rocky Planets around WDs with the Cosmic Origins Spectrograph (COS)
Debes, John H.; Hines, Dean C.; Bourque, Matthew +2 more
The search for transiting habitable exoplanets has broadened to include several types of stars that are smaller than the Sun in an attempt to increase the observed transit depth and hence the atmospheric signal of the planet. Of all spectral types, white dwarfs (WDs) are the most favorable for this type of investigation. The fraction of WDs that p…
The Impact of JWST Broadband Filter Choice on Photometric Redshift Estimation
Ilbert, O.; Nørgaard-Nielsen, H. U.; Colina, L. +8 more
The determination of galaxy redshifts in the James Webb Space Telescope’s (JWST) blank-field surveys will mostly rely on photometric estimates, based on the data provided by JWST’s Near-Infrared Camera (NIRCam) at 0.6-5.0 µm and Mid Infrared Instrument (MIRI) at λ > 5.0 µ {{m}}. In this work we analyze the impact of choosing differe…
A survey of superthermal electron flux depressions, or "electron holes," within the illuminated Martian induced magnetosphere
Fränz, M.; Lester, M.; Andrews, D. J. +4 more
Since Mars lacks a global intrinsic magnetic field, the solar wind interacts directly with the Martian upper atmosphere and ionosphere. The presence of localized intense remnant crustal magnetic fields adds to this interaction, making the Martian plasma system a unique environment within the solar system. Rapid reductions in the electron flux, ref…