X-ray reverberation: a tool to constrain the (evolving) disc geometry in BHXRBs
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1 X-ray reverberation: a tool to constrain the (evolving) disc geometry in BHXRBs Barbara De Marco N. Copernicus Astronomical Center of the Polish Academy of Sciences In collaboration with: G. Ponti, P.O. Petrucci, M. Clavel, S. Corbel, R. Belmont, S. Chakravorty, M. Coriat, S. Drappeau, J. Ferreira, G. Henri, J. Malzac, J. Rodriguez, J. A. Tomsick, F. Ursini, A. A. Zdziarski With funding from the European Union s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No via the Polish National Science Center grant Polonez
2 Plan of the talk and main questions 1. Motivations: Why constraining disc geometry in BHXRBs? Why using X-ray reverberation?
3 Plan of the talk and main questions 1. Motivations: Why constraining disc geometry in BHXRBs? Why using X-ray reverberation? 2. Goal: How do X-ray reverberation lags evolve through different accretion states?
4 Plan of the talk and main questions 1. Motivations: Why constraining disc geometry in BHXRBs? Why using X-ray reverberation? 2. Goal: How do X-ray reverberation lags evolve through different accretion states? 3. Conclusions: What do observations of X-ray reverberation in BHXRBs tell us?
5 Manifestations of accretion: a rich phenomenology Changes in the contribution from optically thick and thin plasma Evolution of a BHXRB in outburst 3)Transition to soft state X-ray Flux 4) Soft state 5) Transition to hard state 6) Back to quiescence 1) Quiescence 2)Rise in hard state X-ray spectral Hardness Spectral evolution + Timing evolution [e.g. Fender+ 04; Belloni+ 05; Dunn+ 10; Muñoz-Darias+ 11]
6 Variations of inner flow geometry A plausible scenario to explain the outburst evolution Disc close to ISCO disc corona Soft state Hard State Disc truncated at large radii disc hot flow [e.g. Esin+ 97; Poutanen + 97; Zdziarski+ 99; Meyer+ 00; Narayan & McClintock 08]
7 Evolving disc geometry: observational evidences Disc non-truncated during soft state, highly-truncated during quiescence Disc L LMC X3 Soft State R in ~ R ISCO Soft state Disc Rin [e.g. Steiner+ 10; Gíerlinski & Done 04] Hard State Quiescence/ Low luminosity R in >> R ISCO [e.g. McClintock+ 95]
8 Evolving disc geometry: observational evidences Disc non-truncated during soft state, highly-truncated during quiescence Disc L LMC X3 Soft State R in ~ R ISCO Soft state Disc Rin [e.g. Steiner+ 10; Gíerlinski & Done 04] How does the disc Hard State Quiescence/ Low luminosity evolve between these two states? R in >> R ISCO [e.g. McClintock+ 95]
9 Reflected component Intensity/shape of reflection features used to constrain geometry BH [Plant+ 15] Data/Model Hard State Luminosity
10 Reflected component Intensity/shape of reflection features used to constrain geometry BH [Plant+ 15] [García+ 15; García s talk] (hard state) Data/Model Hard State Luminosity No general agreement [e.g. Miller+ 04, 06; Reis+ 08; Plant+ 15; García + 15; Basak & Zdziarski 16; Basak + 17]
11 X-ray reverberation Independent method to constrain geometry of the inner accretion flow [review: Uttley+ 14; E. Kara s talk] BH [Blandford & McKee 82]
12 X-ray reverberation Independent method to constrain geometry of the inner accretion flow [review: Uttley+ 14; E. Kara s talk] BH [Blandford & McKee 82] time delay maps physical distances Flux Time
13 X-ray reverberation Independent method to constrain geometry of the inner accretion flow [review: Uttley+ 14; E. Kara s talk] BH [Blandford & McKee 82] time delay maps physical distances Flux Can be used to constrain geometry! Time
14 Disc reverberation in XMM soft band sensitivity allows observing the disc during the hard state Lag (s) Covariance Energy (kev) [Uttley + 11]
15 Disc reverberation in XMM soft band sensitivity allows observing the disc during the hard state Lag (s) Covariance Hard lags associated with primary continuum [e.g. Kotov+ 01; see also Mastroserio s talk] Energy (kev) [Uttley + 11]
16 Disc reverberation in XMM soft band sensitivity allows observing the disc during the hard state Lag (s) Covariance Hard lags associated with primary continuum [e.g. Kotov+ 01; see also Mastroserio s talk] Energy (kev) [Uttley + 11]
17 Disc reverberation in XMM soft band sensitivity allows observing the disc during the hard state Lag (s) Covariance Hard lags associated with primary continuum [e.g. Kotov+ 01; see also Mastroserio s talk] Energy (kev) [Uttley + 11]
18 Disc reverberation in XMM soft band sensitivity allows observing the disc during the hard state Lag (s) Covariance Hard lags associated with primary continuum [e.g. Kotov+ 01; see also Mastroserio s talk] Disc thermal reverberation Energy (kev) [Uttley + 11] thermalized photons reflected photons BH
19 Reverberation lags vs accretion state Sample: 10 sources observed with XMM [De Marco+ 15, De Marco & Ponti 16]
20 Lag (s) Reverberation lags vs accretion state Sample: 10 sources observed with XMM [De Marco+ 15, De Marco & Ponti 16] Energy (kev) Disc thermal reverberation! New detections (, H )
21 Lag (s) Reverberation lags vs accretion state Sample: 10 sources observed with XMM [De Marco+ 15, De Marco & Ponti 16] Energy (kev) Disc thermal reverberation! New detections (, H ) BHXRB H rg 6 rg 1 rg
22 Reverberation lags vs accretion state Sample: 10 sources observed with XMM [De Marco+ 15, De Marco & Ponti 16] [De Marco+ 13 see also Kara s review talk] Lag (s) Radio quiet AGN Energy (kev) Disc thermal reverberation! New detections (, H ) BHXRB H rg 6 rg 1 rg Offset between BHXRBs and the AGN sample
23 Reverberation lags vs accretion state Sample: 10 sources observed with XMM [De Marco+ 15, De Marco & Ponti 16] Lag (s) Energy (kev) Disc thermal reverberation! New detections (, H ) range of! L/LEdd! (Hard state) BHXRB [De Marco+ 13 see also Kara s review talk] Radio quiet AGN high L/LEdd! (Soft state?) H rg 6 rg 1 rg Offset between BHXRBs and the AGN sample different inner flow geometry
24 Evolution of reverberation lag during outburst Variations of lag amplitude as a function of luminosity in the hard state H
25 Evolution of reverberation lag during outburst Variations of lag amplitude as a function of luminosity in the hard state [De Marco+ 15; De Marco & Ponti 16] H H The reverberation lag decreases as the source rises in luminosity through the hard state
26 Evolution of reverberation lag during outburst Variations of lag amplitude as a function of luminosity in the hard state [De Marco+ 15; De Marco & Ponti 16] H H The reverberation lag decreases as the source rises in luminosity through the hard state Decreasing distance of primary X ray-to-disc reprocessing sites
27 Aim: mapping the reverberation lag during an entire outburst End of soft-to-hard state transition and return to quiescence [De Marco+ 17, submitted] RXTE XMM archival XMM 2015 monitoring [See Petrucci s poster E03]
28 Aim: mapping the reverberation lag during an entire outburst Overall results [De Marco+ 17, submitted] End of soft-to-hard transition, Hard state (descending) Hard state (rising)
29 Aim: mapping the reverberation lag during an entire outburst Overall results [De Marco+ 17, submitted] ~200 rg End of soft-to-hard transition, Hard state (descending) Hard state (rising) Mapped distances ~40 rg
30 Aim: mapping the reverberation lag during an entire outburst Overall results [De Marco+ 17, submitted] ~200 rg End of soft-to-hard transition, Hard state (descending) Hard state (rising) Mapped distances ~40 rg FeK Equivalent width Fourier-resolved spectroscopy 1000 rg [Gilfanov+ 00] hard state 100 rg soft state 10 rg Frequency (Hz)
31 Mapping the reverberation lag during outburst Evidences of evolving disc geometry throughout hard/hard-intermediate states [De Marco+ 17, submitted] BH
32 Mapping the reverberation lag during outburst Evidences of evolving disc geometry throughout hard/hard-intermediate states [De Marco+ 17, submitted] BH 1. Hard state (rising) disc truncation radius moving in
33 Mapping the reverberation lag during outburst Evidences of evolving disc geometry throughout hard/hard-intermediate states [De Marco+ 17, submitted] BH 1. Hard state (rising) disc truncation radius moving in
34 Mapping the reverberation lag during outburst Evidences of evolving disc geometry throughout hard/hard-intermediate states [De Marco+ 17, submitted] BH 1. Hard state (rising) disc truncation radius moving in 2. End of soft-to-hard transition disc highly truncated
35 Mapping the reverberation lag during outburst Evidences of evolving disc geometry throughout hard/hard-intermediate states [De Marco+ 17, submitted] BH 1. Hard state (rising) disc truncation radius moving in 2. End of soft-to-hard transition disc highly truncated 3. Hard state (descending) disc truncation radius receding
36 FeK reverberation? Prominent feature at FeK energy in lag-energy spectra FeK reverberation? Disc thermal reverberation [De Marco+ 17, submitted] Thermal and FeK lag consistent with reprocessing occurring in the same region of the disc
37 Conclusions 1. Motivations: Why constraining disc geometry in BHXRBs? Why using X-ray reverberation?
38 Conclusions 1. Motivations: Why constraining disc geometry in BHXRBs? Why using X-ray reverberation? Understand origin of observed phenomenology in BHXRBs X-ray reverberation offers an independent method to constrain geometry
39 Conclusions 1. Motivations: Why constraining disc geometry in BHXRBs? Why using X-ray reverberation? Understand origin of observed phenomenology in BHXRBs X-ray reverberation offers an independent method to constrain geometry 2. Goal: How do X-ray reverberation lags evolve through different accretion states?
40 Conclusions 1. Motivations: Why constraining disc geometry in BHXRBs? Why using X-ray reverberation? Understand origin of observed phenomenology in BHXRBs X-ray reverberation offers an independent method to constrain geometry 2. Goal: How do X-ray reverberation lags evolve through different accretion states? During hard-intermediate/hard state reverberation lag maps distances ranging between ~ rg Reverberation lag amplitude decreases as luminosity increases Possible detection of FeK reverberation
41 Conclusions 1. Motivations: Why constraining disc geometry in BHXRBs? Why using X-ray reverberation? Understand origin of observed phenomenology in BHXRBs X-ray reverberation offers an independent method to constrain geometry 2. Goal: How do X-ray reverberation lags evolve through different accretion states? During hard-intermediate/hard state reverberation lag maps distances ranging between ~ rg Reverberation lag amplitude decreases as luminosity increases Possible detection of FeK reverberation 3. Conclusions: What do observations of X-ray reverberation in BHXRBs tell us?
42 Conclusions 1. Motivations: Why constraining disc geometry in BHXRBs? Why using X-ray reverberation? Understand origin of observed phenomenology in BHXRBs X-ray reverberation offers an independent method to constrain geometry 2. Goal: How do X-ray reverberation lags evolve through different accretion states? During hard-intermediate/hard state reverberation lag maps distances ranging between ~ rg Reverberation lag amplitude decreases as luminosity increases Possible detection of FeK reverberation 3. Conclusions: What do observations of X-ray reverberation in BHXRBs tell us? Variations of inner flow geometry characterize hard/hard-intermediate states Results consistent with a truncated and evolving accretion disc
43 Thanks!
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