Updates in Modeling the Updates in Modeling the CIV Broad Line - - PowerPoint PPT Presentation

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Updates in Modeling the Updates in Modeling the CIV Broad Line - - PowerPoint PPT Presentation

Aug 01, 2023 315 likes •613 views

Updates in Modeling the Updates in Modeling the CIV Broad Line Region CIV Broad Line Region Anna Pancoast Einstein Fellow (Harvard-Smithsonian Center for Astrophysics) August 17-18, 2017 AGN STORM Meeting Review of 2016 results

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SLIDE 1

Updates in Modeling the Updates in Modeling the CIV Broad Line Region CIV Broad Line Region

Anna Pancoast

Einstein Fellow (Harvard-Smithsonian Center for Astrophysics) August 17-18, 2017 – AGN STORM Meeting

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SLIDE 2
  • Figure of the spectral

decomposition and wavelength ranges

Wavelength (Angstroms)

Wavelength range modeled

Review of 2016 results

  • Simple BLR model is able to fit the Hβ data
  • Both line profile shape and integrated line flux
  • Using UV continuum
  • Not strongly dependent on choice of Goad or Pei-anomaly

start date

  • To do: get final version of data to use full red wing!

Anna Pancoast, CfA

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SLIDE 3

Model Fits to the Hβ Data

Anna Pancoast, CfA

Goad - Anomaly Pei - Anomaly Green/blue = data Red = model fits Example fits to the Hβ spectra Integrated Hβ flux Continuum light curve and models

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The CIV Data

Anna Pancoast, CfA

Cyan = data with the continuum and narrow emission lines subtracted Black = model for CIV without narrow or broad absorption Pink = model for CIV without narrow absorption Wavelength (Angstroms) Example of spectrum around CIV

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SLIDE 5

The CIV Data

Anna Pancoast, CfA

Cyan = data with the continuum and narrow emission lines subtracted Black = model for CIV without narrow or broad absorption Pink = model for CIV without narrow absorption Wavelength (Angstroms) Example of spectrum around CIV All the CIV spectra Bad pixels

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SLIDE 6

The CIV Data

Anna Pancoast, CfA

Cyan = data with the continuum and narrow emission lines subtracted Black = model for CIV without narrow or broad absorption Pink = model for CIV without narrow absorption Wavelength (Angstroms) Example of spectrum around CIV All the CIV spectra Bad pixels + masked absorption

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SLIDE 7

Model Fits to the Masked CIV Data

Anna Pancoast, CfA

Goad - Anomaly Continuum light curve and models Integrated CIV non-masked flux Green/blue = data Red = model fits Example fits to the CIV spectra

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Overview of 2017 results

  • What has happened since last year:
  • Ideas for the BLR geometry from MEMEcho
  • Finalized UV models to unmask CIV
  • Goals:
  • Try to match the CIV variability in more detail
  • Compare results from masked and modeled CIV
  • Tests completed:
  • Default CARAMEL model
  • Default + variable outer radius + hot spot
  • Constant spectral component = mean spectrum
  • Constant spectral component = Gaussian mixture

model (GMM)

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SLIDE 9

Default BLR model

Pancoast, Brewer, & Treu 2014

Anna Pancoast, CfA

Radial profile of emission: Gamma distribution Opening angle (sphere → disk)

  • Geometry
  • Dynamics

Near-circular Inflowing Outflowing

BH

Transparent → opaque mid-plane Disk → cone More emission from near or far side

Model spectrum is made entirely from variable flux!

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Results from the default BLR model

Anna Pancoast, CfA

Modeling the full CIV line (broad + narrow absorption) Modeling the CIV narrow absorption lines T=80 T=160

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Results from the default BLR model

Anna Pancoast, CfA

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Summary of default results

  • When absorption is masked, black hole mass is

lower and inclination/opening angles are higher and poorly constrained

  • Following results focus on un-masked CIV!
  • Convergence fairly good, but more likelihood

levels could be explored

Anna Pancoast, CfA

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Adding a variable maximum radius + hot spot

Anna Pancoast, CfA

Increasing width of hot spot

More emission from far side Equal emission from near/far side More emission from near side

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SLIDE 14

Results from adding a variable maximum radius + hot spot

Anna Pancoast, CfA

Modeling the full CIV line (broad + narrow absorption) Modeling the CIV narrow absorption lines T=160 T=280

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SLIDE 15

Results: variable rmax + hot spot

Anna Pancoast, CfA

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SLIDE 16

Summary of variable radius + hot spot results

  • Hot spot parameters not well determined
  • Maximum radius parameter pulled to highest

values (~50 ld)

  • More likelihood levels would help (shown for

100 levels, 120 looks similar)

  • These changes to BLR geometry do not

dramatically improve model fit!

Anna Pancoast, CfA

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SLIDE 17

Results from adding a constant spectral component = means spectrum

  • The amplitude of the constant spectral

component is inferred to be very small, so it is not affecting the model fit!

  • Adding a constant component in the model for
  • ther AGN has sometimes affected the results,

so there is reason to try other constant component models

Anna Pancoast, CfA

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Adding a constant spectral component = Gaussian mixture model (GMM)

Anna Pancoast, CfA

Simulated data spectrum Variable GMM Combined Inference of simulated data Sim data Variable GMM

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Results from adding a constant spectral component = GMM

Anna Pancoast, CfA

Modeling the full CIV line (broad + narrow absorption) Modeling the CIV narrow absorption lines T=200 T=150

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GMM results: model all absorption

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GMM results: model narrow absorption

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Summary of GMM results

  • CIV does prefer some constant spectral

component

  • Convergence is still an issue for dynamics

parameters

  • More likelihood levels are needed to try getting

better fit to CIV variability and more consistent GMM models

Anna Pancoast, CfA

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SLIDE 23

Run comparison for CIV modeling all absorption

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SLIDE 24

Run comparison for CIV modeling narrow absorption

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SLIDE 25

Run comparison for masked CIV

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Conclusions

  • Simple BLR model is able to fit the Hβ data
  • Although still need to model the full red wing!
  • CIV variability has been harder to model
  • Un-masking the data has provided more constraints
  • Adding geometry parameters and a constant

spectral component don't significantly improve the fit

  • Longer runs with more likelihood levels are still

needed, but challenging due to computational constraints (e.g. run time limits on supercomputers)

  • Suggestion welcome!

Anna Pancoast, CfA

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SLIDE 27

Black hole mass Mean radius Shape

  • f radial

distr. Minimum radius Opening angle of disk Inclination angle Near or far side asymmetry Mid-plane transparency Fraction of gas in near- circular orbits Disk or cone asymmetry Inflow or

  • utflow

(outflow!) How radial and unbound are the inflow/outflow

  • rbits

Constraints on Hβ BLR Model Parameters

Anna Pancoast, CfA Red lines show median and 68% confidence intervals from LAMP 2008 for Hβ

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SLIDE 28

Example posterior PDFs

Anna Pancoast, CfA

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Results from adding a constant spectral component = GMM