A5077123629- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Calibration and Measurement Techniques
- Remote Sensing in Agriculture
- Pulsars and Gravitational Waves Research
- Astrophysics and Star Formation Studies
University of Copenhagen
2012-2021
As part of the OzDES spectroscopic survey we are carrying out a large scale reverberation mapping study $\sim$500 quasars over five years in 30 deg$^2$ area Dark Energy Survey (DES) supernova fields. These have redshifts ranging up to 4 and apparent AB magnitudes between $16.8<r<22.5$ mag. The aim is measure time lags fluctuations quasar continuum broad emission line fluxes individual objects order black hole masses for range AGN constrain radius-luminosity ($R-L$) relationship. Here...
ABSTRACT During an intensive Hubble Space Telescope (HST) Cosmic Origins Spectrograph (COS) UV monitoring campaign of the Seyfert 1 galaxy NGC 5548 performed from 2014 February to July, normally highly correlated far continuum and broad emission line variations decorrelated for ∼60–70 days, starting ∼75 days after first HST /COS observation. Following this anomalous state, flux variability lines returned a more normal state. This transient behavior, characterized by significant deficits in...
Reverberation mapping probes the structure of broad emission-line region (BLR) in active galactic nuclei (AGN). The kinematics BLR gas can be used to measure mass central supermassive black hole. main uncertainty affecting hole determinations is BLR. We present a new method for reverberation based on regularized linear inversion (RLI) that includes modelling AGN continuum light curves. This enables fast calculation velocity-resolved response maps constrain structure. RLI allows negative...
Measurements of galaxy cluster kinematics are important in understanding the dynamical state and evolution clusters galaxies, as well constraining cosmological models. While it is established that exhibit non-spherical geometries, evident distribution galaxies on sky, azimuthal variations within have yet to be observed. Here we measure dependence line-of-sight velocity dispersion profile a stacked sample 1743 from Sloan Digital Sky Survey (SDSS). The drawn SDSS DR8 redMaPPer catalog. We find...
Observations and numerical simulations of galaxy clusters strongly indicate that the hot intracluster x-ray emitting gas is not spherically symmetric. In many earlier studies spherical symmetry has been assumed partly because limited data quality, however new deep observations instrumental designs will make it possible to go beyond assumption. Measuring temperature density profiles are interest when observing gas, spatial shape itself also carries very useful information. For example,...
Abstract In Spring 2011, the Lick AGN Monitoring Project observed a sample of 15 bright, nearby Seyfert 1 galaxies in V band as part reverberation mapping campaign. The observations were taken at six ground-based telescopes, including West Mountain Observatory 0.91 m telescope, 0.76 Katzman Automatic Imaging Telescope, 0.6 Super-LOTIS Kitt Peak, Palomar 60 inch and 2 Faulkes telescopes North South. -band light curves measure continuum variability our Seyferts on an almost daily cadence for...