STEPHAN’S QUINTET -by Matthew Johnson. OVERVIEW Why I chose Stephan’s Quintet Information about the Quintet How I obtained the images Final Image.

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Presentation transcript:

STEPHAN’S QUINTET -by Matthew Johnson

OVERVIEW Why I chose Stephan’s Quintet Information about the Quintet How I obtained the images Final Image

WHY I CHOSE THIS OBJECT

STEPHAN’S QUINTET Édouard Stephan discovered his “quintet” in 1877 at the Marseille Observatory Located in the constellation Pegasus About million light years from Earth (although NGC 7320 is ~40 million ly) The molecular hydrogen seen in the starburst region is one of the most turbulent forms of molecular hydrogen ever seen.

STEPHAN’S QUINTET One of the fastest moving objects in the observable universe is a galactic shock wave (green) moving at several hundred million miles per hour. This phenomenon is caused by the galaxy NGC 7318B (just to the right of the green gas) The largest amount of molecular hydrogen ever observed

STEPHAN’S QUINTET This unusual system has often been used as proof that the redshift is not truly a distance indicator Four of the galaxies have similar, large redshifts, the fifth (NGC7320), shows a much smaller redshift. Conventional theory states that the low-redshift galaxy is in a nearby group and by coincidence appears on the sky projected against a distant background group.

TAKING IMAGES 20” Cassegrain Telescope STL CCD-1001E RGB Filters 20-3 minute clear images 10-3 minute RGB I chose to use RGB filters instead of narrowband because the galaxies are so far away and so faint. If I were to use narrowband it would not bring forth much more detail than I already have.

TAKING IMAGES Night 1: Start Time: 1730 (5:30 pm) End Time: ~0030 (12:30 am) Never used the 20” by myself, so mainly a learning night Result: 20 Clear Images

TAKING IMAGES CONTINUED… Night 2: Start Time: 1700 (5:00pm) End Time: 0030 (12:30am) Mirrors were off. Took about an hour to fix, we got lucky! After that we fix mirrors, CLOUDS!! I wait an hour or so……MORE CLOUDS!! Result: No usable data

TAKING IMAGES CONTINUED… Night 3: Start Time: 1730 (5:30 pm) End Time: ~2100 (9:00 pm) Started out as a perfect night, temperature in the upper 60s, no wind…lets image!! Then this happened: Around 8:30 the temperature dropped 30 degrees in less than 5 minutes followed by what felt like 60 mph winds Result: No usable data!

TAKING IMAGES CONTINUED… Night 4: Start Time: 1730 (5:30 pm) End Time: 0130 (1:30 am) Clear..ish Mild wind 20 degrees! Result: 10 RGB images of each filter!

FINAL IMAGE! With close to 40 hours of attempted imaging -Freezing weather -Tornado like winds -Equipment malfunctions Several hours of trial and error with Photoshop! -Reduce -Align -Combine

NGC 7320 NGC 7318B NGC 7318A NGC 7317 NGC 7319

REFERENCES mosBurrito.jpg mosBurrito.jpg

QUESTIONS?