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

NGC2936-7_BAADSS_poster.png (272.3 kB)

Like this image

Grant Privett, Callum Potter, James Weightman, Pierre Vandevenne, Hugh Allen, Gary Eason, Peter Mulligan, NORMAN GRAY, Dominic Ford, David Stalford

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