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Spectrum of M87 Nucleus

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About this observation
Observer
Robin Leadbeater
Time of observation
11/04/2019 - 22:32
Object
M87
Observing location
Wigton Cumbria
Equipment
Celestron C11 telescope
ALPY 600 spectrograph
ATIK 428 camera
Exposure
100 min
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Since M87 has been in the news recently with the radio image of the region immediately surrounding the black hole, 

https://aasnova.org/2019/04/10/first-images-of-a-black-hole-from-the-event-horizon-telescope/

I thought I would take a spectrum of this region using the ALPY600.  I obviously could not get anywhere near as close in as  the radio image but the spectrum of the nucleus (red) shows clear emission lines of H alpha, [N II], [S II]  from the material in the region surrounding the black hole, redshifted by  ~1300km/s . Note the absence of these emission lines in the spectrum covering a region further out (blue). I have also included a spectrum of this region from the literature taken by the 3.6m TNG telescope in 2008 (orange) which covers the central 2x2 arc sec region from this reference 

https://www.aanda.org/articles/aa/abs/2009/09/aa11102-08/aa11102-08.html

Also for comparison is a K3v stellar reference spectrum,shifted to match the M87 redshift. Note the similarity with the combined starlight from this mature elliptical galaxy.

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