NGC 4945 in Centaurus (Bruce Rohrlach)

Celestial hemisphere: Southern · Constellation: Centaurus (Cen) · Contains: NGC 4945 · The star ξ1 Cen

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NGC 4945 in Centaurus

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NGC 4945 in Centaurus

The main subject of the Saturday 26th March imaging run from home in Lysterfield in Melbourne’s outer east - NGC 4945.

A barred spiral galaxy in Centaurus, just 13 million light years away, and located near the main sequence star Xi1 Centauri. All the stars in front of NGC 4945 are from within our own galaxy. It is one of the brightest galaxies of the Centaurus A/M83 Group, a nearby group of 44 known galaxies.

The Milky Way’s not-so-distant cousin, NGC 4945, has an active galactic nucleus, releasing far more energy than our own Milky Way galaxy of 100-400 billion stars. NGC 4945 is classed as a Seyfert galaxy. They harbour supermassive black holes at their centres which are surrounded by accretion disks of in-falling material. The black hole at the centre of NGC 4945 weighs in at around 1.6 million solar masses. Active galactic nuclei are the most luminous sources of electromagnetic radiation in the Universe, and their evolution puts constraints on cosmological models.

Seen edge-on here, the galactic disk is partly shrouded by obscuring dust bands that block the light from behind.

120 luminance frames at 30secs/frame (pixels binned at 1x1).
50 red filter frames at 30secs/frame (pixels binned at 2x2).
50 green filter frames at 30secs/frame (pixels binned at 2x2).
50 blue filter frames at 30secs/frame (pixels binned at 2x2).

Integration time: 2 hours 15 minutes. Gain 200, CCD chip temperature -20 Celcius.

Please note: The following tables are updated every 24 hours.

Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

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
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

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
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
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
Started	...
Astrometry.net job	5959194
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC 4945 in Centaurus

NGC 4945 in Centaurus

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NGC 4945 in Centaurus

NGC 4945 in Centaurus

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