Since M87 has been in the news recently with the radio image of the region immediately surrounding the black hole, I thought I would take a spectrum of this region using the ALPY600.
https://britastro.org/node/17807
Cheers
Robin
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Spectrum of M87 Nucleus
Sat, 2019-04-13 15:30
#1
Spectrum of M87 Nucleus
Thanks for sharing that. Can you add any links to the radio image?
Hi John,
I have added links to the AAS article on the radio image (just 50 micro arcsec across !) and the source of the 2008 comparison professional spectrum.
Cheers
Robin
Fascinating spectrum Robin! A good demonstration that the emission lines are generated in the central region of the galaxy.
Cheers
Andy
Thanks Andy,
I wonder how compact the emission line source is compared to the region shown in the radio image. (unfortunately the spectrum was not very well focused at H alpha so the extent is not clear in my spectrum)
Robin
EDIT this image and spectra from HST suggests the main emission region region extends around 1 arcsec or so across
http://www.rpi.edu/dept/phys/courses/79205/Pics/HST95/diskM87Data.gif
I think that would make the emission region about 250 light years across, assuming a distance of 55 million light years.
Andy
Robin,
Good work, so nice to see such detailed spectra and information.
Regards,
Jack
Essex UK