NGC 5474 (Cedric Raguenaud)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: NGC 5474

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NGC 5474

Link: http://raguenaud.space/2020/05/ngc-5474/

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NGC 5474

Link: http://raguenaud.space/2020/05/ngc-5474/

This is NGC 5474. It is a dwarf galaxy satellite of M101. It's about 15 hours of integration (it's faint I need a bit more).

It's fascinating in that it's one of the few galaxies that look lopsided. The reason has long been assumed that it was the gravitational pull of M101 nearby that created it.

However, a paper published in Astronomy & Astrophysics in February this year ("The strange case of the peculiar spiral galaxy NGC 5474, New pieces of a galactic puzzle" by M. Bellazzini et al.) casts doubts on that explanation. There are several reasons:

- the galaxy has arms (even a faint bar), where recent star formation has occured (they're blue). These arms are centered on the bulge of the galaxy, therefore it might not be lopsided.

- there is a half circle of older stars SW of the bulge (left of the bulge in the image). That half circle is off-centre. M101 could have a responsibility in this, but it doesn't really explain it well. Another possible explanation is that the dwarf galaxy interacted with another dwarf galaxy a few Gyrs ago (goven the positions and velocities of M101 and NGC 5474, their interaction would be a few 100Myrs ago, so too late).

- it could even be that that region IS another dwarf galaxy. The bulge itself could be another dwarf galaxy. Data is currently insufficient to know.

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Description: Darkened background (hate those uncalibrated LCD screens!), sharpened galaxy a bit. Hope it's not too cartoonish.

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Status	Advanced success
Started	...
Astrometry.net job	3598176
PixInsight job	WJNAGSEUNU3ZCD1U1EBABR9IQMR8RIEP
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	14h05m02s.349
RA (top/left)	14h06m02s.505
RA (top/right)	14h05m42s.650
RA (bottom/right)	14h04m01s.759
RA (bottom/left)	14h04m23s.100

Dec (center)	+53°39′20″.38
Dec (top/left)	+53°30′38″.55
Dec (top/right)	+53°50′20″.17
Dec (bottom/right)	+53°48′00″.98
Dec (bottom/left)	+53°28′19″.67

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