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
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