Concluding remarks - Mullard Space Science...
Transcript of Concluding remarks - Mullard Space Science...
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Concluding remarks
Jelle Kaastra
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Spectroscopy
• High-resolution X-ray spectroscopy: hardly can find any other more important topic in astrophysics…
• Below just some highlights: many other interesting contributions
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Fluorescence
• Not many cases shown @ this meeting• Cool material around T Tauri stars
(Manuel Güdel)• Field will revive if we get the first flying
calorimeters
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Triplet diagnostics & radiation fields
• Triplet ratio’s sensitive to density and radiation field
• Can be used to determine distance gas (Ton Raassen, Jürgen Schmitt)
• Density evolution in stellar flares (Manuel Güdel)
• Presence of accretion disks (idem)
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Absorption/Emission measure distribution
• Tomer Holczer: AMD: shows power of this method; also allows to disentangle Galactic foreground from AGN outflow in MCG -6-30-15
• Jeremy Sanders: EMD: cool core clusters (by the way, this shows AGN-cluster connection)
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Photoionised plasmas
• Susmita Chakravorty: importance of modeling relevant physics (SED, Z) factors needed for proper interpretation of photoinised outflows in AGN
• Elisa Costantini: mixed CIE/PIE in X-ray binaries?
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Photoionised gas in AGN
• Where is it? Ionisation processes?• Spectral imaging Dan Evans• Spectral timing Katrien Steenbrugge• Long term monitoring Rob Detmers
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Relativistic lines ionisedabsorbers partial covering
• Talks by Andy Young, Jane Turner, Lance Miller: complicated spectra/timing structure
• This will keep us busy for quite some time• Will IXO be able to answer this question?
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Broad lines in AGN
• Not the relativistic ones, but still quite broad
• Where are these lines (not only Fe, but also O, etc.)? Torus? BLR?
• Clues: Anna Lia Longinotti, Stefano Bianchi
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Abundances
• Spectroscopy resolving the origin of a source: XB 1832-330: Ne/O=0.17 no Neoverabundance, no evidence for Ne-rich donor (Lara Sidoli)
• Altair: Ne/O=0.20+/-0.05, similar to Sun, so not consistent with Drake & Testa (Jürgen Schmitt)
• p.m.: what is “Solar” (I get 0.26+/-0.02 towards Crab, using RGS, Kaastra et al. 2009)
• Cr/Mn in SNR (Vink)
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ISM
• 4U 1820-30, 4 HETGS epochs, no significant variability absorbing gas; all points to solely hot ISM origin, not intrinsic to source (Ed Cackett)
• O VII etc @ z=0: is it WHIM, Local Group or Galactic halo? (Rick Williams)
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Shocks etc(etc = interesting!)
• Colliding winds, need for IXO (Andy Pollock)
• Equilibration in shocks (Jacco Vink)• NEI effects in SNR (Dasha Kosenko)• Importance of spectral imaging (Dan
Dewey)• Importance of monitoring (Frank Haberl)• Calibration (Paul Plucinsky)
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(Very) complex source spectra
• Nova V2491 Cyg: what do we see? (Jan-Uwe Ness)
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Planetary nebulae
• Beautiful results with LETGS (Young Sam Yu, Ehud Behar)
• Shows power of spectroscopy: abundances, T-measurement through RRCs
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Comet physics
• RGS data challenge: extended, moving object; background from “HDF” (KonradDennerl)
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Statistics
• Publication bias!!! There are hundreds of “hidden trials” (Phil Uttley)
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New Instrumentation
• Talks by Nicastro, Parmar, Mitsuda, Ohashi, den Herder
• We really need those, but:• We have not yet used the full potential of
current instruments: bomb Norbert & Harvey with good spectroscopy proposals!
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Atomic physics
• Good tools available, but still lot to improve till Astro-H & IXO (e.g., Randall Smith)
• Use these tools (e.g., www.sron.nl/spex )
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Nobel prizes waiting for you…
• Axions (Doron Chelouche)
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What does this mean?
• Sacrify graduate students (Randall Smith)• Not much fame in this business (idem)• You are not supposed to publish this …(idem) • you can look until you drop and do not find
periodicity for some sources (Frank Verbunt)• δ Ori: it is there up above the pub (Andy Pollock)• “I am a cheese-plate in between” (Dan Dewey)• “I even can fit the light-curve with a blackbody”
(Jan-Uwe Ness)
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Quality of talks
You all did a wonderful job! (knowing my critical mind…) Very good
Good
RathergoodSufficient
Insufficient
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See you all next year!
• High-resolution X-ray spectroscopy: past, present and future
• Utrecht, Netherlands• March 15-17, 2010• See
www.sron.nl/xray2010