Imaging telescope or lens: APM LZOS 130/780 f/6 LW CNC II 130mm APO
Imaging camera: FLI Microline ML8300
Mount: Takahashi EM-200 Temma2
Guiding telescope or lens: Orion Deluxe 50mm MiniGuider
Guiding camera: Orion SSAG
Focal reducer: William Optics 132/110 FLT Field Flattener
Filter: Astrodon Gen2E LRGB
Integration: 8.7 hours
Astrometry.net job: 886193
RA center: 170.248 degrees
DEC center: 13.330 degrees
Pixel scale: 1.839 arcsec/pixel
Orientation: 178.518 degrees
Field radius: 0.802 degrees
The Leo triplet or M66 group is located in the constellation Leo at approximately 35 million light years and contains M66, M65 and NGC 3628. NGC 3628 (Hamburger galaxy) has a 300000 light year long tidal tail that is visible in this image taken mostly at SQM 21.7. The vertically-oriented feature visible at the very end of the tidal tail is a tidal dwarf galaxy (TDG) that was discovered by Nikiel-Wrocynski et al. only last year (2014). The idea of dwarf objects forming from the tidal debris left by galaxy mergers was first proposed by Zwicky in 1956, with many such ‘recycled’ galaxy candidates now known in various merging galaxy systems, with this one the closest to the Milky Way.
Click on the link above the title to compare an inverted crop of this image with that from Leo TDG discovery paper which can be found at:
8.7 hr LRGB
D.A.R.C. Observatory, Mercey Hot Springs, CA 4/12/15, 4/18/15
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