Hidden from view

This ESO Picture of the Week shows the centre of a galaxy named NGC 5643. This galaxy is located 55 million light-years from Earth in the constellation of Lupus (The Wolf), and is known as a Seyfert galaxy. Seyfert galaxies have very luminous centres — thought to be powered by material being accreted onto a supermassive black hole lurking within — that can also be shrouded and obscured by clouds of dust and intergalactic material.

As a result, it can be difficult to observe the active centre of a Seyfert galaxy. NGC 5643 poses a further challenge; it is viewed at a high inclination, making it even trickier to view its inner workings. However, scientists have used the Atacama Large Millimeter/submillimeter Array (ALMA) together with archival data from the Multi Unit Spectroscopic Explorer (MUSE) instrument on ESO’s Very Large Telescope to reveal this view of NGC 5643 — complete with energetic outflowing ionised gas pouring out into space.

These impressive outflows stretch out on either side of the galaxy, and are caused by matter being ejected from the accretion disc of the supermassive black hole at NGC 5643’s core. Combined, the ALMA and VLT data show the galaxy’s central region to have two distinct components: a spiraling, rotating disc (visible in red) consisting of cold molecular gas traced by carbon monoxide, and the outflowing gas, traced by ionised oxygen and hydrogen (in blue-orange hues) perpendicular to the inner nuclear disc.

Credit:

ESO/A. Alonso-Herrero et al.; ALMA (ESO/NAOJ/NRAO)

About the Image

Id:potw1822a
Type:Observation
Release date:28 May 2018, 06:00
Size:804 x 484 px

About the Object

Name:NGC 5643
Type:Local Universe : Galaxy : Activity : AGN : Seyfert
Distance:55 million light years
Constellation:Lupus
Category:Galaxies

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Coordinates

Position (RA):14 32 40.60
Position (Dec):-44° 10' 28.03"
Field of view:0.68 x 0.41 arcminutes
Orientation:North is 0.1° right of vertical

Colours & filters

BandWavelengthTelescope
Optical
OIII
495 nmVery Large Telescope
MUSE
Optical
H-alpha
656 nmVery Large Telescope
MUSE
Millimeter
CO(2-1)
1.292208 mmAtacama Large Millimeter/submillimeter Array
Band 6

 

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