galactic astronomy (i): sne and snr (ii): pulsars _____________________________ jon marcaide asi,...
TRANSCRIPT
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GALACTIC ASTRONOMY (I): SNe and SNR(II): PULSARS
_____________________________
Jon Marcaide
ASI, Castel San Pietro Terme, 18 September 2001
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GALACTIC ASTRONOMY (I):GALACTIC ASTRONOMY (I):
SNe and SNRSNe and SNR
JON MARCAIDEASI, 18 Sept 2001
Castel San Pietro Terme
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Does radiointerferometry, and in particular VLBI,
have anything to add to the picture?
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SNR in M82
• Muxlow et al. MNRAS 266, 455 (1994)
• Pedlar et al. MNRAS 307, 761 (1999)
• McDonald et al. MNRAS 322, 100 (2001)
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SNR in M82
• Muxlow et al. MNRAS 266, 455 (1994) (MERLIN 6cm, 50mas resol, 23 sources / 15 SNR candidates)
• Pedlar et al. MNRAS 307, 761 (1999) (EVN 18cm, 15mas (0.2pc), 5 SNR in detail, all size < 1pc; expansion of 43.31+592: 10,000km/s (1mas/yr); v(41.95+575) < 4000 km/s); ages ranging from decades to hundreds of years)
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SNR in M82• Muxlow et al.
• Pedlar et al.
• McDonald et al. MNRAS 322, 100 (2001) (20-station VLBI 18cm, 3mas, deceleration of 43.31+592: m>0.73; vradial(41.95+575)<2000 km/s; 41.95+575 a compact, young SNR in a dense medium? Perhaps not.
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NGC 2146
• Tarchi et al. A&A (2000) (MERLIN+VLA-6cm, detect 18 sources, resolve 7; only 3 have spectral indices expected for SNR, others compact HII?)
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M.A. Pérez-Torres, Ph. D. thesis, Univ. Valencia (1999)
Pérez-Torres, Alberdi & Marcaide, A&A 374, 997-1002 (2001)
Mioduszewski, Dwarkadas & Ball,
ApJ (2001), in press
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SN 1986J
• Bartel, Rupen, Shapiro ApJ 337, L85 (1989)
• Bartel et al. Nature 350, 212 (1991)
• Deviations from spherical symmetry
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