Threads of blue

Esahubble_potw1823a_1024

esahubble_potw1823a June 4th, 2018

Credit: ESA/Hubble & NASA

A ripple of bright blue threads through this galaxy like a misshapen lake system. The foreground of this image is littered with nearby stars with their gleaming diffraction spikes. A keen eye can also spot a few other galaxies that, while masquerading as stars at first glance, reveal their true nature on closer inspection. The central galaxy streaked with colour, IC 4870, was discovered by DeLisle Stewart in 1900 and is located approximately 28 million light-years away. It contains an active galactic nucleus, or AGN: an extremely luminous central region so alight with radiation that it can outshine the rest of the galaxy put together. AGNs emit radiation across the complete electromagnetic spectrum, from radio waves to gamma-rays, produced by the action of a central supermassive black hole that is devouring material getting too close to it. IC 4870 is also a Seyfert galaxy, a particular kind of AGN with characteristic emission lines. IC 4870 has been imaged by Hubble for several studies of nearby active galaxies. By using Hubble to explore the small-scale structures of AGN in nearby galaxies, astronomers can observe the traces of collisions and mergers, central galactic bars, nuclear starbursts, jets or outflows, and other interactions between a galactic nucleus and its surrounding environment. Images such as this can help astronomers understand more about the true nature of the galaxies we see throughout the cosmos.

Image Source: https://www.spacetelescope.org/images/potw1823a/

Curator: ESA/Hubble, Garching bei München, Germany

Image Use Policy: Creative Commons Attribution 4.0 International License

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Image Details

Image Type
Observation
Object Name
IC 4870
Subject - Local Universe
Galaxy > Activity > AGN > Seyfert
Esahubble_potw1823a_128
 

Position Details

Position (ICRS)
RA = 19h 37m 36.7s
DEC = -65° 48’ 47.6”
Orientation
North is 47.7° CW
Field of View
2.5 x 1.7 arcminutes
Constellation
Pavo

Color Mapping

  Telescope Spectral Band Wavelength
Arrow_left_red Hubble Space Telescope (ACS) Optical (I) 814.0 nm
Arrow_left_green Hubble Space Telescope (ACS) Optical (I) 814.0 nm
Arrow_left_green Hubble Space Telescope (ACS) Optical (V) 606.0 nm
Arrow_left_blue Hubble Space Telescope (ACS) Optical (V) 606.0 nm
Spectrum_base
Arrow_top_red
Arrow_top_green
Arrow_top_green
Arrow_top_blue
Esahubble_potw1823a_1280
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ID
potw1823a
Subject Category
C.5.3.2.2  
Subject Name
IC 4870
Credits
ESA/Hubble & NASA
Release Date
2018-06-04T06:00:00
Lightyears
Redshift
Reference Url
https://www.spacetelescope.org/images/potw1823a/
Type
Observation
Image Quality
Distance Notes
Facility
Hubble Space Telescope, Hubble Space Telescope, Hubble Space Telescope, Hubble Space Telescope
Instrument
ACS, ACS, ACS, ACS
Color Assignment
Red, Green, Green, Blue
Band
Optical, Optical, Optical, Optical
Bandpass
I, I, V, V
Central Wavelength
814, 814, 606, 606
Start Time
Integration Time
Dataset ID
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
294.402907041, -65.8132287144
Reference Dimension
3000.0, 2000.0
Reference Pixel
1855.0, 1067.0
Scale
-1.3884321597596345E-05, 1.3884321597596345E-05
Rotation
-47.699999999999996
Coordinate System Projection:
TAN
Quality
Position
FITS Header
Notes
Creator (Curator)
ESA/Hubble
URL
http://www.spacetelescope.org
Name
Email
Telephone
Address
Karl-Schwarzschild-Strasse 2
City
Garching bei München
State/Province
Postal Code
D-85748
Country
Germany
Rights
Creative Commons Attribution 4.0 International License
Publisher
ESA/Hubble
Publisher ID
esahubble
Resource ID
potw1823a
Metadata Date
2018-03-09T10:39:15+01:00
Metadata Version
1.1
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Detailed color mapping information coming soon...

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There is no distance meta data in this image.