A ghostly galaxy lacking dark matter

Esahubble_heic1806a_1024

esahubble_heic1806a March 28th, 2018

Credit: NASA, ESA, and P. van Dokkum (Yale University)

NGC 1052-DF2 resides about 65 million light-years away in the NGC 1052 Group, which is dominated by a massive elliptical galaxy called NGC 1052. This large, fuzzy-looking galaxy is so diffuse that astronomers can clearly see distant galaxies behind it. This ghostly galaxy is not well-formed. It does not look like a typical spiral galaxy, but it does not look like an elliptical galaxy either. Based on the colours of its globular clusters, the galaxy is about 10 billion years old. However, even the globular clusters are strange: they are twice as large as typical groups of stars. All of these oddities pale in comparison to the weirdest aspect of this galaxy: NGC 1052-DF2 is missing most, if not all, of its dark matter. The galaxy contains only a tiny fraction of dark matter that astronomers would expect for a galaxy this size. But how it formed is a complete mystery. Hubble took this image on 16 November 2017 using its Advanced Camera for Surveys.

Image Source: https://www.spacetelescope.org/images/heic1806a/

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
NGC 1052-DF2
Subject - Local Universe
Galaxy
Esahubble_heic1806a_128
 

Position Details

Position (ICRS)
RA = 2h 41m 46.6s
DEC = -8° 24’ 8.9”
Orientation
North is 21.5° CW
Field of View
2.5 x 1.7 arcminutes
Constellation
Cetus

Color Mapping

  Telescope Spectral Band Wavelength
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_red Hubble Space Telescope (ACS) Optical (I) 814.0 nm
Arrow_left_blue Hubble Space Telescope (ACS) Optical (V) 606.0 nm
Spectrum_base
Arrow_top_green
Arrow_top_green
Arrow_top_red
Arrow_top_blue
Esahubble_heic1806a_1280
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ID
heic1806a
Subject Category
C.5  
Subject Name
NGC 1052-DF2
Credits
NASA, ESA, and P. van Dokkum (Yale University)
Release Date
2018-03-28T19:00:00
Lightyears
Redshift
Reference Url
https://www.spacetelescope.org/images/heic1806a/
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
Green, Green, Red, Blue
Band
Optical, Optical, Optical, Optical
Bandpass
I, V, I, V
Central Wavelength
814, 606, 814, 606
Start Time
Integration Time
Dataset ID
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
40.444298501, -8.40247490734
Reference Dimension
3000.0, 2000.0
Reference Pixel
1500.0, 1000.0
Scale
-1.389125369016497E-05, 1.389125369016497E-05
Rotation
-21.479999999999997
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
heic1806a
Metadata Date
2018-05-29T18:58:01.047876
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.