NGC 7331 the Deer Lick Group (Robert.S)

Celestial hemisphere: Northern · Constellation: Pegasus (Peg) · Contains: NGC 7331 · NGC 7335 · NGC 7336 · NGC 7337 · NGC 7340

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NGC 7331 the Deer Lick Group

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NGC 7331 the Deer Lick Group

NGC 7331 is a spiral galaxy of some 100,000 light-years across, located about 49 million light-years away from Earth in the northern constellation of Pegasus, while it is receding from us at roughly 816 kilometers per second. It is the brightest member of the NGC 7331 Group of galaxies (also called the Deer Lick Group).

Another peculiar feature of NGC 7331 is a counter-rotating inner stellar disk component with a radius of 1,300 to 5,000 light-years. To make matters more complicated the galaxy possesses a decoupled inner disk-bulge component within the central 650 light-years where ionized gas is rotating faster than the rest of the surrounding central bulge. The stellar population of the circumnuclear stellar-gaseous disk is also relatively young compared to the normal older bulge population with stars that are about 2 billion years old.

The most likely scenario accounting for the retrograde disk component and the decoupled gas is a large scale merger in the remote past where the aberrantly rotating system is genetically related to the merged galaxy.

Until recently, SN 1959D, a Type II supernova that became as bright as 13.4 magnitude, was the only supernova that had been identified within NGC 7331. However, on April 21, 2013 the Type II supernova SN 2013bu was discovered in this galaxy.

Original
B
Final
C

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Distribution of astrophotographers

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	Distinct awarded users	Total awarded images
Image of the day
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Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
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Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
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Professional, scientific grade data
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Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Basic success
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Astrometry.net job	3874100
PixInsight job	n/a
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NGC 7331 the Deer Lick Group

NGC 7331 the Deer Lick Group

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Image Index:

Contribution Index (beta):

NGC 7331 the Deer Lick Group

NGC 7331 the Deer Lick Group

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