[Date Prev][Date Next][Thread Prev][Thread Next][Search] [Main Index] [Thread Index] [HEASARC Mailing List Archives]

Re: VLP meeting logistics



Hi Una, Martin,

I have of course some interest in the Ti-44 item listed in the schedule,
but in addition I would like to further investigate the non-thermal
emission from the shock front, and possibly from inside the remnant as
well. So if anybody is interested we can discuss this at the meeting.

Should we give small presentations for each item?

Other things that may be interesting to discuss are:
- Ne, Mg deficiency in Cas A. Is there really a lack of it, or do we
just don't see it? Ne, Mg are expected further out in the ejecta.
Fitting shows that Ne, Mg factor 10 less than standard models. What we
see in Cas A is a lot of Si and more massive elements. Could this be
supportive
for a small progenitor, with a high explosion energy (all Ne, Mg gets
processed)?

-Apart from the Ti-44 elements, we might be able to come up with
Chromium measurements.


- Evidence for Fe-K at 6.4 keV from close to shock front or from dust
(Kazik once wrote a paper on that)




Jacco

On Fri, 2004-03-26 at 18:50, Una Hwang wrote:
> Dear VLP'ers,
> 
> Here are some logistical details about where to stay, how to
> get to NRL, etc for the Cas A meeting on May 6th/7th. At the
> end is a tentative agenda and some ideas for projects to get
> people thinking and start some discussion. A firmer agenda
> will be compiled and distributed closer to the time. We plan
> to start at 10am on May 6th to give anyone traveling from
> the east coast time to get here on that morning. The
> conference room is booked 8am - 5pm each day, so we can
> start earlier on May 7th. Contact us with any questions or
> difficulties.
> 
> Una Hwang
> Martin Laming
> 
> Most of these details, plus maps are available at 
> http://lheawww.gsfc.nasa.gov/users/hwang/nrl.html
> 
> Directions to NRL:
> http://www.nrl.navy.mil/content.php?P=PLANNINGVISIT
> 
> The meeting will be in room 113 of building 226. Building
> 209 houses the Space Science Division. Martin's office is
> room 152 in bldg 209.  See website above for NRL map.
> 
> NRL is accessible by public transport, but this is not
> recommended. Take the green line metro to Anacostia, and
> then change to an A4 or A5 bus (cost 25c with a bus transfer
> ticket obtained inside the metro). A5 is a few minutes
> quicker, but runs less often.
> 
> Much better to drive. The locals (Una, Martin, and possibly
> some others) will be able to give lifts to people without
> cars staying in hotels in College Park or Greenbelt, which
> are not far off their normal routes to NRL. Some parking
> spaces close to Building 226 will be reserved for us.
> Otherwise parking is easiest to find between buildings 226
> and 209 and the river (see map). Convenient hotels are here
> (with the first, Quality Inn and Suites probably being the
> most convenient, closest to the metro which also serves
> Union Station and Reagan National Airport, etc):
> 
> http://www.inform.umd.edu/CampusInfo/Departments/guest/visitor/localhotel.html
> 
> Some of the more reasonably priced hotels in Alexandria from
> Martin's AAA book; might be more reasonable for anyone with
> their own car, especially if driving up from points south.
> 
> Washington Suites-Alexandria $79-$159
> 703 370 9600, 100 S. Reynolds St., Alexandria VA 22304
> 
> Holiday Inn Eisenhower Metro $99-$155
> 703 960 3400, 2460 Eisenhower Ave, Alex VA 22314
> 
> Red Roof Inn $69-$89
> 703 960 5200, 5875 Richmond Hwy, Alex VA 22303
> 
> Traveller's Motel $65-$79
> 703 329 1310, 5916 Richmond Hwy, Alex VA 22303
> 
> One of our regular visitors to NRL, Peter Sturrock, likes to
> stay in Alexandria Old Town itself. The Holiday Inn there is
> $199-229, (703 549 6080, 480 King St, Alex VA 22314) if
> anyone likes the good life.  They do advertise AAA
> discounts. I am also told that the Watergate is quite
> nice... but way over anyone's per diem!
> 
> 
> Cas A VLP Analysis Meeting Tentative Agenda
> -------------------------------------------
>  
> May 6th Start at 10.00 am 
> -------------------------
> Discussion of Specific Proposal Goals, i.e., element
> abundances, nucleosynthesis, asymmetric explosions and the
> science/data analysis needed to move this forward:
> 
> Welcome to NRL and Introduction to Cas A proposal, 
> spectral modelling and data reduction/analysis.  
> Martin Laming/Una Hwang
>  
> Cas A Dynamics Measurements. Tracey Delaney/Larry Rudnick
> 
> May 7th 
> -------
> Other topics: 
> 
> Models for hydrodynamics in the jet regions How are
> Truelove/McKee SNR models changed in clumpy plasma?
> (Roger Chevalier and Alexei Khokhlov have indicated that
> they are more likely to be available on the Friday, and
> their expertise is clearly central to these topics).
>  
> Synchrotron emission and particle acceleration, electron-ion
> equilibration at shock fronts at elsewhere.
> 
> Point source.
> 
> Potential projects so far, with a few tentative names:
> ----------------------------------------------------- 
> Fe census, - Hwang/Laming
> 
> Quantitative Fe vs Si morphology, - Hughes
>  
> Proper motions and Doppler shifts of X-ray knots , -
> Delaney/Rudnick?
>  
> Detailed fitting of a number of X-ray knots for explosion
> asymmetry and element abundances, - everyone who can bear
> it!
>     
> Search for Fe knots in the jet regions. If overdense
> compared to elsewhere, then Fe will be thermally unstable
> for a wider range of initial mass coordinates and might not
> be visible. Can we place limits on this if Fe is not found?
> 
> Characterize southwest counterjet
>  
> Other faint high velocity ejecta, - Hughes
> 
> Look for inner shell lines of Sc and Ca in the faint inner
> regions, as 44Ti and 44Sc decay by K shell electron capture
> to 44Sc and 44Ca?
>     
> Refine models to produce theoretical spectra (not just
> ionization balance, and electron temperature), for direct
> comparison with data. Might not be able to bypass XSPEC
> completely, but this would be an important check.
>  
> Point source and interaction with ejecta, - Hughes
> 
-- 
-------------------------------------------------------------------------------
 Dr Jacco Vink                        || e-mail   : J.Vink@sron.nl
 SRON  Nat.Instute for Space Research || http://www.sron.nl/~jvink
 Sorbonnelaan 2                       || telephone: +31-30-2538577
 3584 CA Utrecht, The Netherlands     || facsimile: +31-30-2540860
-------------------------------------------------------------------------------