1 / 22

Probing Black Hole Mass with OzDES AGN: Insights from Reverberation Mapping

Explore black hole mass measurements with Australian Dark Energy Survey (OzDES) AGN. Study AGN structure, supermassive black holes, accretion disk, and emission regions. Use reverberation mapping to calculate BLR radius and cloud velocity. Investigate Radius-Luminosity relationships and black hole evolution to high redshifts. OzDES observations target 771 AGN up to z=4, with recovery of initial lags from CIV line, including one at z=2.593. Future data could provide over 200 new lag measurements. Exciting prospects for understanding black hole and galaxy evolution.

dfairweather
Download Presentation

Probing Black Hole Mass with OzDES AGN: Insights from Reverberation Mapping

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Black Hole Mass Measurements with the Australian Dark Energy Survey (OzDES) Janie K. Hoormann University of Queensland 23 April 2019

  2. Active Galactic Nuclei • Compact central region of active galaxies • AGN Structure • Supermassive black hole • ~105-109 Msun • Accretion Disk • Light days • Broad Line Region (BLR) clouds • Light weeks/months • Narrow Line Region clouds and Dusty Torus • Light years Credit: Urry and Padovani 1995

  3. Δt R ~ cΔt Disk Emission Cloud Emission R Time Time

  4. Disk Emission Cloud Emission Time Time

  5. Disk Emission Cloud Emission Time Time

  6. Disk Emission Cloud Emission Time Time

  7. Disk Emission Cloud Emission Time Time

  8. Disk Emission Cloud Emission Time Time

  9. Disk Emission Cloud Emission Time Time

  10. Δt R ~ cΔt Disk Emission Cloud Emission R Time Time Sample light curves from bitbucket.org/nye17/javelin

  11. Reverberation Mapping • Calculate BLR radius using time delay between direct emission and ionized emission from BLR • Use the width of the emission line to determine the velocity of the clouds • Assuming black hole and clouds are in virial equilibrium

  12. The Big RM Questions • Do the extrapolated Radius-Luminosity relationships really hold out to high redshifts? • Secondary black hole mass measurements • AGN as standard candles • If we have black hole mass measurements out to high redshifts what can this tell us about black hole and galaxy evolution? Credit: Bentz et al. 2013 ApJ 767:149 Figure 11

  13. RM with OzDES • Targeting 771 AGN in the 10 DES-SN fields • 0 < z < 4.5 • Weekly observations with DES • Photometry taken with DECam on the 4m Blanco Telescope in Chile • Model the continuum emission from the disk • Monthly observations with OzDES • Spectroscopy using 2dF AAOmega on the AAT at Siding Springs • Model the response of the BLR • Hβ , MgII, CIV emission lines

  14. DES J0033-42 z = 2.593 C Hoormann et al 2019, submitted to MNRAS, arXiv:1902.04206

  15. M = (3.3 ± 1.2) x 109Mʘ DES J0033-42 Observed Lag = days Rest Frame Lag = days z = 2.593 343 days ~350 days C Hoormann et al 2019, submitted to MNRAS, arXiv:1902.04206

  16. DES J0238-04 z = 1.905 Hoormann et al 2019, submitted to MNRAS, arXiv:1902.04206

  17. DES J0238-04 M = (4.4 ± 2.0) x 109Mʘ Rest Frame Lag = days Observed Lag = days z = 1.905 358 days ~350 days Hoormann et al 2019, submitted to MNRAS, arXiv:1902.04206

  18. Hoormann et al 2019, submitted to MNRAS, arXiv:1902.04206

  19. Future of OzDES

  20. 46 secure, 151 probable new lags measurements with Year 5 data!!!!

  21. Just look what one more year can do!

  22. Summary • OzDES is targeting 771 AGN out to z=4 • Recovered first 2 lags using the CIV line • Including one at z = 2.593! • Preliminary look at year 5 data shows we should be able to recover almost 200 more! • And there is still data from year 6 to analyse!

More Related