ABSTRACT
We report the results of long-term reverberation mapping campaigns of the nearby active galactic nuclei (AGNs) NGC 4151, spanning from 1994 to 2022, based on archived observations of the ...FAST Spectrograph Publicly Archived Programs and our new observations with the 2.3 m telescope at the Wyoming Infrared Observatory. We reduce and calibrate all the spectra in a consistent way, and derive light curves of the broad H β line and 5100 Å continuum. Continuum light curves are also constructed using public archival photometric data to increase sampling cadences. We subtract the host galaxy contamination using Hubble Space Telescope imaging to correct fluxes of the calibrated light curves. Utilizing the long-term archival photometric data, we complete the absolute flux-calibration of the AGN continuum. We find that the H β time delays are correlated with the 5100 Å luminosities as $\tau _{\rm H\beta }\propto L_{5100}^{0.46\pm 0.16}$. This is remarkably consistent with Bentz et al. (2013)’s global size–luminosity relationship of AGNs. Moreover, the data sets for five of the seasons allow us to obtain the velocity-resolved delays of the H β line, showing diverse structures (outflows, inflows, and discs). Combining our results with previous independent measurements, we find the measured dynamics of the H β broad-line region (BLR) are possibly related to the long-term trend of the luminosity. There is also a possible additional ∼1.86 yr time lag between the variation in BLR radius and luminosity. These results suggest that dynamical changes in the BLR may be driven by the effects of radiation pressure.
Abstract We report first-time reverberation-mapping results for 14 active galactic nuclei (AGNs) from the ongoing Monitoring AGNs with H β Asymmetry campaign (MAHA). These results utilize optical ...spectra obtained with the Long Slit Spectrograph on the Wyoming Infrared 2.3 m Telescope between 2017 November and 2023 May. MAHA combines long-duration monitoring with high cadence. We report results from multiple observing seasons for nine of the 14 objects. These results include H β time lags, supermassive black hole masses, and velocity-resolved time lags. The velocity-resolved lags allow us to investigate the kinematics of the broad-line region.
Changing the Culture of Discovery Favro, Philip J; Dembin, Mitchell D
The American journal of trial advocacy,
04/2014, Letnik:
37, Številka:
3
Journal Article
The recently proposed amendments to the Federal Rules of Civil Procedure are intended to address certain problems posed by discovery in the digital age. The proposed changes will have little, if any, ...effect on how discovery actually is conducted without a corresponding change in discovery culture. This Article explores the steps that in-house counsel should take to effect a change in discovery culture that could result in reduced costs, speedier resolutions, and better traction in court.
We report first-time reverberation mapping results for 14 AGNs from the
ongoing Monitoring AGNs with H$\beta$ Asymmetry campaign (MAHA). These results
utilize optical spectra obtained with the Long ...Slit Spectrograph on the Wyoming
Infrared 2.3m Telescope between 2017 November-2023 May. MAHA combines
long-duration monitoring with high cadence. We report results from multiple
observing seasons for 9 of the 14 objects. These results include H$\beta$ time
lags, supermassive black hole masses, and velocity-resolved time lags. The
velocity-resolved lags allow us to investigate the kinematics of the broad-line
region.
We report the results of long-term reverberation mapping (RM) campaigns of the nearby active galactic nuclei (AGN) NGC 4151, spanning from 1994 to 2022, based on archived observations of the FAST ...Spectrograph Publicly Archived Programs and our new observations with the 2.3m telescope at the Wyoming Infrared Observatory. We reduce and calibrate all the spectra in a consistent way, and derive light curves of the broad H\(\beta\) line and 5100\,Å continuum. Continuum light curves are also constructed using public archival photometric data to increase sampling cadences. We subtract the host galaxy contamination using {\it HST} imaging to correct fluxes of the calibrated light curves. Utilizing the long-term archival photometric data, we complete the absolute flux-calibration of the AGN continuum. We find that the H\(\beta\) time delays are correlated with the 5100\,Å luminosities as \(\tau_{\rm H\beta}\propto L_{5100}^{0.46\pm0.16}\). This is remarkably consistent with Bentz et al. (2013)'s global size-luminosity relationship of AGNs. Moreover, the data sets for five of the seasons allow us to obtain the velocity-resolved delays of the H\(\beta\) line, showing diverse structures (outflows, inflows and disks). Combining our results with previous independent measurements, we find the measured dynamics of the H\(\beta\) broad-line region (BLR) are possibly related to the long-term trend of the luminosity. There is also a possible additional \(\sim\)1.86 years time lag between the variation in BLR radius and luminosity. These results suggest that dynamical changes in the BLR may be driven by the effects of radiation pressure.
We report first-time reverberation mapping results for 14 AGNs from the ongoing Monitoring AGNs with H\(\beta\) Asymmetry campaign (MAHA). These results utilize optical spectra obtained with the Long ...Slit Spectrograph on the Wyoming Infrared 2.3m Telescope between 2017 November-2023 May. MAHA combines long-duration monitoring with high cadence. We report results from multiple observing seasons for 9 of the 14 objects. These results include H\(\beta\) time lags, supermassive black hole masses, and velocity-resolved time lags. The velocity-resolved lags allow us to investigate the kinematics of the broad-line region.
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