NGC 4395 (Armin Unterwandling)

Celestial hemisphere: Northern · Constellation: Canes Venatici (CVn) · Contains: NGC 4395

Powered byPixInsight

NGC 4395

Powered byPixInsight

NGC 4395

At a distance of just 14 million light-years NGC is a close galactic neighbor. That should make its central black hole one of the easiest to study. Unfortunately, though there's not much to see.
The black hole is one of the least massive yet detected in the center of a galaxy, and it also is one of the quietest.
NGC 4395 is cassifield as an AGN (active galactic nucelus) galaxy, indcating that its core is emitting large amounts of energy. The source of the nergy is usually a supermassive black hole surrounded by a hot, active accretion disk.
In 2003, studies of the motions of stars around the galaxy's nucleus suggested the presence of a supermassive black hole, but one that was unusually small. Follow-up studies with Hubble Space Telescope allowed astronomer to pin down the black hole's mass at 360,000 times the mass of the Sun.
Observations with a network of radio telescopes revealed the presence of material flowing outward from the accretion disk, squirting about one light-year away from the black hole.
NGC 4395 is a small spiral galaxy with no central "bluge" of stars. Such galaxies are expected to have either no central black hole or a small one, because there appers to be a mechanism in which the central bulge feeds gas and dust to the black hole, causing it to grow. With no bluge, there should be no ready food supply for the black hole. So the small black hole in NGC 4395 may help astronomers understand how supermassive black holes form - perhaps from small "seed" black holes that later grow to enormous proportions.

ZWO ASIAIR PRO USERS
ASI533MC Pro
Austria Astrophotography

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	9773250
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

Image Index:

Contribution Index (beta):

NGC 4395

NGC 4395

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

In these public groups

		...
You have no new notifications.

Image Index:

Contribution Index (beta):

NGC 4395

NGC 4395

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

In these public groups

Notifications

AstroBin is in READ ONLY mode

Sorry :-(

Sorry :-(

Sorry :-(

Are you really sure?

Warning!

Warning!

Are you sure?

Report abuse

Slideshow settings

IOTD/TP stats (last [x] days)

Distribution of astrophotographers

Distribution of subject types

Distribution of data sources

Sorry

Sorry

Share

Upload new revision

Upload uncompressed source (XISF/FITS/PSD/TIFF)

Delete image and all its revisions?

Delete original image?

Delete all other versions?

Delete all revisions?

IOTD/TP stats

The following people like this image

The following people bookmarked this image

Warning

Flag malfunctioning thumbnails

Contains

Remove yourself as a collaborator

Plate-solving information