Sky & Telescope - June 2022 - 39
ARP 299 Staying in Ursa Major, we find this duo in which a close
encounter some 700 million years ago triggered a burst of star formation.
Various sources misidentify Arp 299 as NGC 3690 and IC 694, or
apply the latter designation to the eastern component. Instead, IC 694 is
a 16th-magnitude elliptical 1′ to the northwest. Observers using the 72inch
Leviathan reflector of William Parsons, the Third Earl of Rosse, first
noted this dim speck in 1852.
NGC 5256 This twosome, also in Ursa Major, dramatically shows
the effects of merging: The red streamerlike features are gas and dust
spilled from the guts of the galaxies, while the blue patches are regions
of recent star formation.
VV 705 Back in Boötes, we come to this tight pair - the cores of
these galaxies are only some 16,000 light-years apart; in fact, the system
is likely midway through a merger.
each weigh in at a hefty 200 million solar masses. According
to a 2012 study at infrared and X-ray wavelengths, a fierce
" superwind " is driving an intense outflow of gas and dust,
forming ionized ribbons of nebulosity to the north.
To locate NGC 5256, point to 1.9-magnitude Alkaid, Eta
Using my 18-inch at 285×, the bright western half
(NGC 3690W) encompasses a conspicuous starlike nucleus,
while the fainter eastern member (NGC 3690E) shows little
concentration. A common irregular envelope, which spans
1.25′ in diameter, enfolds the pair.
At 610× in Jimi's scope, NGC 3690W was a dazzling, irregular
knot of high surface brightness with a brilliant quasi-stellar
nucleus. Larger NGC 3690E held a small vivid core. A very lowsurface-brightness,
asymmetric halo spread northwest, and a
detached H II region briefly materialized off its edge. Hovering
nearby are two more galaxies. I easily viewed IC 694, a 16thmagnitude
companion 1′ northwest, along with Arp 296, an
interacting pair 2.5′ northeast that lies far in the background.
NGC 5256 is a mid-merger (M3) train wreck hosting a
dual AGN separated by just 15,000 light-years. The SMBHs
(η) Ursae Majoris, the end star in the handle of the Big Dipper.
Our target is just 1.8° southwest of the star, midway
between Alkaid and the showpiece Whirlpool Galaxy (M51)!
In my 18-inch, I found a moderately bright 40″ × 30″
oval, leaning southwest to northeast. The surface brightness
appeared uneven, though I couldn't resolve the dual nuclei, a
mere 10″ apart. But jumping to 375× in my 24-inch exposed
the quasi-stellar eastern nucleus. Viewed with Jimi's 48-inch,
a fainter outer halo encased the luminous central region, and
I easily resolved both nuclei.
At a distance of 560 million light-years, VV 705 is the
most remote M3 pair on our tour. So there's no surprise a
whisker-thin 6″ separates its nuclei. This dusty LIRG sports
a pair of looping tidal arms that make a wild U-turn and
even overlap each other. A 2019 spectroscopic study detected
sk yand tele scope .o r g * JUNE 2022 39
http://www.skyandtelescope.com
Sky & Telescope - June 2022
Table of Contents for the Digital Edition of Sky & Telescope - June 2022
Contents
Sky & Telescope - June 2022 - Cover1
Sky & Telescope - June 2022 - Cover2
Sky & Telescope - June 2022 - 1
Sky & Telescope - June 2022 - Contents
Sky & Telescope - June 2022 - 3
Sky & Telescope - June 2022 - 4
Sky & Telescope - June 2022 - 5
Sky & Telescope - June 2022 - 6
Sky & Telescope - June 2022 - 7
Sky & Telescope - June 2022 - 8
Sky & Telescope - June 2022 - 9
Sky & Telescope - June 2022 - 10
Sky & Telescope - June 2022 - 11
Sky & Telescope - June 2022 - 12
Sky & Telescope - June 2022 - 13
Sky & Telescope - June 2022 - 14
Sky & Telescope - June 2022 - 15
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Sky & Telescope - June 2022 - 17
Sky & Telescope - June 2022 - 18
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Sky & Telescope - June 2022 - 24
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Sky & Telescope - June 2022 - 28
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Sky & Telescope - June 2022 - 33
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Sky & Telescope - June 2022 - 35
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Sky & Telescope - June 2022 - 37
Sky & Telescope - June 2022 - 38
Sky & Telescope - June 2022 - 39
Sky & Telescope - June 2022 - 40
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Sky & Telescope - June 2022 - 42
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Sky & Telescope - June 2022 - Cover3
Sky & Telescope - June 2022 - Cover4
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