Observation by Robin Leadbeater: NGC 2936/2937 galaxy redshifts from spec...
Uploaded by
Robin Leadbeater
Observer
Robin Leadbeater
Observed
2025 Mar 18 - 19:58
Uploaded
2025 Mar 20 - 17:34
Objects
NGC2936
NGC2937
Spectrum
Equipment
- ALPY 200 spectrograph
- ATIK 428 ex camera
- Celestron C11 SCT 280mm aperture f5.5
Exposure
9x600s and 10x600s
Location
Wigton Cumbria UK
Target name
spectra of NGC 2936 NGC 2937
Title
NGC 2936/2937 galaxy redshifts from spectra
About this image
These two interacting galaxies were the Deep Sky Section Objects of Interest for March 2025. The spectra are from the brightest regions in the two galaxies.
The redshifts were measured from the spectra based on the clear H alpha emission line in NGC 2936 and by cross correlating the spectrum of NGC 2937 with a spectrum of a K2 star to replicate the aggregate spectrum of the stars in the galaxy.
The redshifts are similar suggesting that they are indeed at a similar distance and moving together. There is however a few hundred km/s radial velocity difference between the two galaxies implying the galaxy cores are moving relative to each other. There are no recorded distances for the two galaxies in the NASA Extragalactic Database but using the redshift and Hubble's law suggests a distance of ~300Mly.
Files associated with this observation
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Grant Privett,
Callum Potter,
James Weightman,
Pierre Vandevenne,
Hugh Allen,
Gary Eason,
Peter Mulligan,
NORMAN GRAY,
Dominic Ford,
David Stalford,
Paul Whitmarsh
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