Reanalyzing the Relationship Between X-ray PSD Breaks and Black - PowerPoint PPT Presentation

Mar 21, 2023 •259 likes •331 views

Reanalyzing the Relationship Between X-ray PSD Breaks and Black Hole Mass Rachael Merritt Georgia State University AGN Storm Collaboration Meeting Atlanta, Georgia 18 August 2017 Power Spectral Density Functions Radio-quiet AGN X-ray

Reanalyzing the Relationship Between X-ray PSD Breaks and Black Hole Mass Rachael Merritt Georgia State University AGN Storm Collaboration Meeting Atlanta, Georgia 18 August 2017
Power Spectral Density Functions • Radio-quiet AGN X-ray variability equivalent to red noise (Uttley&McHardy, 2005) • Short scale (higher frequency) • Hours à Days • Slope ~ -2 • Long Scale (lower frequency) • Weeks à Years • Slope ~ -1 (González-Martín & Vaughan, 2012)
Making PSDs Fourier Transform NGC 3227 (Uttley & McHardy, 2005)
AGN v. BH-XRB • Is SMBH behavior scaled up stellar mass BH behavior? • Narrow line Seyfert I • Similar to BH-XRB in high/soft state • Broad line Seyfert • Similar to BH-XRB in low/hard state • Broad band PSD better test • Accretion • PSD shape is different between BH-XRB states
Fitting the Breaks • Slope changes at some bend frequency, ν b (González- Martín&Vaughan, 2012) • ν b scales inversely with mass of BH • Fitting the PSD • Power law • Broken power law (Uttley&McHardy, 2005) • Bending power law • ??? (González-Martín & Vaughan, 2012)
Going Forward • Has anything changed? • New Masses • New Sources • What is the best way to characterize ν b ? • Be consistent across the board • Systematics? • ???

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