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Crowded-field 3D Spectrophotometry of Extragalactic PNe
Extragalactic Planetary Nebulae beyond the Milky Way ESO Garching, May 19-21, 2004 Martin Roth Thomas Becker Petra Böhm Detlef Schönberner Matthias Steffen ( AIP ) Crowded-field 3D Spectrophotometry of Extragalactic PNe Katrina Exter ( IAC )
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Introduction Instruments First Experiments in M31 Recent Results for Leo A and Sextans B Outlook & Summary
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Problems : Slit Losses Seeing = f (t) Seeing = f ()
Atmospheric Refraction Background Contamination, Source Confusion Jacoby & Kaler 1993, ApJ 417, 209
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l d a
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Point Sources ?
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2. Instrumentation
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Multi Pupil Fibre Spectrograph
at the 6m-Telescope in Selentchuk V. Afanasiev S. Dodonov 8-8.5min. Insgesamt 9.5 min. insgesamt
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3D Spectroscopy of Stars …
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Data Cube Animation : ( data cube courtesy of James Turner, Gemini-S )
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( data cube courtesy of James Turner, Gemini-S )
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EG 131 AM=1.22 +
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HR 1544
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3. First Experiments in M31 Roth et al. 2004, ApJ 603, 531
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H [N II] 6584 [S II] 6717 [S II] 6731 [N II] 6548 [O III] 4959 [O III] 5007 [O II] 3727 [Ne III] 3869 [Ne III] 3967 [O III] 4364 H H H
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PN29 monochromatic maps :
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PN29, monochromatic maps
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V H
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PN29, monochromatic maps
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cplucy ( 2-channel deconvolution )
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4. Recent Results
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Leo A Skillman et al. ( 1989 ) Jacoby & Lesser ( 1981 )
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U V R
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Sextans B Magrini et al. 2002
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5. Outlook
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VIMOS-IFU ( VLT UT3 ) NGC 3242
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new 1 arcmin FOV PPAK IFU :
75‘‘ 65‘‘
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MUSE
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Jacoby, Quigley & Africano PASP 99, 672 (1987)
As an example, here is a set of monochromatic images of the planetary nebula IC351, extracted from the datacube of a test snap shot which was taken for us at the russian 6m telescope with a micropupil spectrograph in November 1996. The images show the emission in [O III] 5007, H beta, He II 4686, two Argon lines, and in the continuum which shows up as the central star (of magnitude 14). The brightness distributions agree remarkably well with what is know from direct interference filter images, in particular regarding the shape of O3 and Hbeta, demonstrating the usefulness of a single exposure with respect to extinction and calibration. You may take this example as fulfilling the request of George Jacoby and his co-authors at NOAO in a paper of some 10 years ago, - however, not exactly with the number of resolution elements they want ("thousands of input apertures"): these are just smoothed images of an 8 by 16 elements lens array.
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