scholarly journals High redshift quasars monitoring campaign

2013 ◽  
Vol 9 (S304) ◽  
pp. 409-410
Author(s):  
Ismael Botti ◽  
Paulina Lira ◽  
Jorge Martinez ◽  
Hagai Netzer ◽  
Shai Kaspi
Keyword(s):  
Cross Correlation ◽  
High Redshift ◽  
Mapping Technique ◽  
Broad Line ◽  
Black Hole Mass ◽  
Massive Black Holes ◽  
Monitoring Campaign ◽  
Reverberation Mapping ◽  
Line Region ◽  
Cross Correlation Analysis

AbstractWe present an update of the monitoring campaign we have undertaken to probe the most massive black holes in powerful quasars at high redshift through the reverberation mapping technique. Once this campaign has finished, we will be able to directly measure broad line region (BLR) sizes of quasars at z ~ 2−3, improving dramatically the BLR size-luminosity relation, and therefore, black hole mass estimates based on this relationship. So far, we have identified a dozen highly variable sources suitable for future cross-correlation analysis and reverberation measurements.

scholarly journals High-Redshift Quasar Monitoring Campaign: Preliminary Results

2009 ◽  
Vol 5 (S267) ◽  
pp. 198-198 ◽  
Author(s):  
Ismael Botti ◽  
Paulina Lira ◽  
Hagai Netzer ◽  
Shai Kaspi
Keyword(s):  
Black Hole ◽  
High Redshift ◽  
Broad Line ◽  
Black Hole Mass ◽  
High Luminosity ◽  
Monitoring Campaign ◽  
Reverberation Mapping ◽  
Broad Line Region ◽  
Line Region ◽  
Region Size

AbstractWe present a monitoring campaign on high-luminosity quasars which will extend the existing reverberation mapping results by two orders of magnitude in luminosity, probing the broad-line region size and black hole mass of luminous AGN at redshift ~ 2 – 3.

scholarly journals Studying the outskirts of reverberation mapped AGNs

2016 ◽  
Vol 12 (S324) ◽  
pp. 219-222
Author(s):  
Shai Kaspi
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
High Redshift ◽  
Mapping Technique ◽  
Black Hole Mass ◽  
High Luminosity ◽  
Massive Black Holes ◽  
Reverberation Mapping ◽  
The Past ◽  
Different Types

AbstractAbout 100 AGNs have their black hole mass measured directly using the reverberation mapping technique over the past few decades. By now we have high enough numbers to explore unique subsamples within these objects and to study phenomena across variety of AGNs. I will review recent reverberation mapping studies which focus on high-redshift high-luminosity AGNs and on AGNs with super-Eddington accreting massive black holes. These studies enable to investigate the BLR size, mass, and luminosity relations in different subsamples of AGNs and to check whether there are differences in these relations in different types of AGNs. In particular I will discuss the following questions: Is the BLR size - luminosity relation the same over the whole AGNs luminosity range? Are there different relations for different types of AGNs? What are these studies teaching us about theory of accretion into black holes in AGNs?

A Photoionization Method for Estimating Black Hole Masses in Quasars

2018 ◽  
Vol 14 (S342) ◽  
pp. 270-271
Author(s):  
C. Alenka Negrete ◽  
Deborah Dultzin ◽  
Paola Marziani ◽  
Jack W. Sulentic ◽  
M. L. Martínez-Aldama
Keyword(s):  
Black Hole ◽  
High Redshift ◽  
Broad Line ◽  
Reverberation Mapping ◽  
Physical Conditions ◽  
Broad Line Region ◽  
Supermassive Black Hole ◽  
Line Region ◽  
Black Hole Masses

AbstractWe present a method that uses photoionization codes (CLOUDY) to estimate the supermassive black hole masses (MBH) for quasars at low and high redshift. This method is based on the determination of the physical conditions of the broad line region (BLR) using observational diagnostic diagrams from line ratios in the UV. We also considered that the density and metallicity of the BLR in quasars at high z could be different from those at the nearby Universe. The computed black hole masses obtained using this method are in agreement with those derived from the method of reverberation mapping.

scholarly journals Modelling the AGN broad-line region using single-epoch spectra − II. Nearby AGNs

2020 ◽  
Vol 493 (1) ◽  
pp. 1227-1248 ◽  
Author(s):  
S I Raimundo ◽  
M Vestergaard ◽  
M R Goad ◽  
C J Grier ◽  
P R Williams ◽  
...  
Keyword(s):  
Physical Model ◽  
Galaxy Evolution ◽  
High Redshift ◽  
Cost Effective ◽  
Monitoring Data ◽  
Broad Line ◽  
Reverberation Mapping ◽  
Broad Line Region ◽  
Line Region ◽  
Single Epoch

ABSTRACT The structure of the broad-line region (BLR) is an essential ingredient in the determination of active galactic nucleus (AGN) virial black hole masses, which in turn are important to study the role of black holes in galaxy evolution. Constraints on the BLR geometry and dynamics can be obtained from velocity-resolved studies using reverberation mapping data (i.e. monitoring data). However, monitoring data are observationally expensive and only available for a limited sample of AGNs, mostly confined to the local Universe. Here, we explore a new version of a Bayesian inference, physical model of the BLR that uses an individual spectrum and prior information on the BLR size from the radius–luminosity relation, to model the AGN BLR geometry and dynamics. We apply our model to a sample of 11 AGNs, which have been previously modelled using monitoring data. Our single-epoch BLR model is able to constrain some of the BLR parameters with inferred parameter values that agree within the uncertainties with those determined from the modelling of monitoring data. We find that our model is able to derive stronger constraints on the BLR for AGNs with broad emission lines that qualitatively have more substructure and more asymmetry, presumably as they contain more information to constrain the physical model. The performance of this model makes it a practical and cost-effective tool to determine some of the BLR properties of a large sample of low- and high-redshift AGNs, for which monitoring data are not available.

The BLR physics from the long-term optical monitoring of type-1 AGN

2019 ◽  
Vol 15 (S356) ◽  
pp. 144-144
Author(s):  
Dragana Ilić
Keyword(s):  
Galactic Nuclei ◽  
Mapping Technique ◽  
Broad Line ◽  
Reverberation Mapping ◽  
Line Region ◽  
Extreme Variability ◽  
Optical Continuum ◽  
Periodic Signals

AbstractThe variation of optical continuum and broad emission lines is observed in all type 1 active galactic nuclei (AGN). In some cases even extreme variability is detected when broad-line profiles completely disappear as is the case in the co-called changing-look AGN, which raise new question on the theoretical model of AGN. This variability is an important tool to study the physics and geometry of the broad line region (BLR), e.g. it can be used to estimate its size through the reverberation mapping technique. Especially, long-term campaigns give new insights, like the detection of the periodic signals or discoveries of changing-look AGN. Here we will present the results of our long-term monitoring campaign of several well-known AGN, as e.g. NGC 3516 for which we confirm that it is the changing-look AGN, putting special attention of the applications for future large time-domain spectroscopic surveys, like the MaunaKea Spectroscopic Explorer project.

scholarly journals Reverberation Mapping of Two Luminous Quasars: The Broad-line Region Structure and Black Hole Mass

2021 ◽  
Vol 920 (1) ◽  
pp. 9
Author(s):  
Sha-Sha Li ◽  
Sen Yang ◽  
Zi-Xu Yang ◽  
Yong-Jie Chen ◽  
Yu-Yang Songsheng ◽  
...  
Keyword(s):  
Black Hole ◽  
Broad Line ◽  
Black Hole Mass ◽  
Reverberation Mapping ◽  
Broad Line Region ◽  
Line Region

scholarly journals Optical continuum photometric reverberation mapping of the Seyfert-1 galaxy Mrk509

2019 ◽  
Author(s):  
F Pozo Nuñez ◽  
N Gianniotis ◽  
J Blex ◽  
T Lisow ◽  
R Chini ◽  
...  
Keyword(s):  
Time Delays ◽  
Narrow Band ◽  
Large Field ◽  
Black Hole Mass ◽  
Disk Model ◽  
Reverberation Mapping ◽  
Line Region ◽  
Optical Continuum ◽  
The Difference ◽  
Flux Calibration

Abstract We present the results of a two year optical continuum photometric reverberation mapping campaign carried out on the nucleus of the Seyfert-1 galaxy Mrk509. Specially designed narrow-band filters were used in order to mitigate the line and pseudo-continuum contamination of the signal from the broad line region, while allowing for high-accuracy flux-calibration over a large field of view. We obtained light curves with a sub-day time sampling and typical flux uncertainties of 1%. The high photometric precision allowed us to measure inter-band continuum time delays of up to ∼2 days across the optical range. The time delays are consistent with the relation τ∝λ4/3 predicted for an optically thick and geometrically thin accretion disk model. The size of the disk is, however, a factor of 1.8 larger than predictions based on the standard thin-disk theory. We argue that, for the particular case of Mrk509, a larger black hole mass due to the unknown geometry scaling factor can reconcile the difference between the observations and theory.

scholarly journals Reverberation Mapping and Broad-Line Region Models

1997 ◽  
Vol 159 ◽  
pp. 138-145
Author(s):  
D. Maoz
Keyword(s):  
Broad Line ◽  
Future Directions ◽  
Reverberation Mapping ◽  
Broad Line Region ◽  
Line Region ◽  
Mapping Point

AbstractI review what we have learned about the BLR from reverberation mapping, point to some problems and complications that have emerged, and outline some future directions.

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