galactic astronomy (i): sne and snr (ii): pulsars _____________________________ jon marcaide asi,...

GALACTIC ASTRONOMY (I): SNe and SNR(II): PULSARS

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Jon Marcaide

ASI, Castel San Pietro Terme, 18 September 2001

GALACTIC ASTRONOMY (I):GALACTIC ASTRONOMY (I):

SNe and SNRSNe and SNR

JON MARCAIDEASI, 18 Sept 2001

Castel San Pietro Terme

Does radiointerferometry, and in particular VLBI,

have anything to add to the picture?

SNR in M82

• Muxlow et al. MNRAS 266, 455 (1994)

• Pedlar et al. MNRAS 307, 761 (1999)

• McDonald et al. MNRAS 322, 100 (2001)

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)

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.

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?)

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

SN 1986J

• Bartel, Rupen, Shapiro ApJ 337, L85 (1989)

• Bartel et al. Nature 350, 212 (1991)

• Deviations from spherical symmetry