A failed galaxy

Eso_potw2122a_1024

eso_potw2122a May 31st, 2021

Credit: ESO/Iodice et al.

If you look closely at the faint and fuzzy centre of this picture, you will find a ghostly galaxy the not-so-spooky-sounding UDG4 captured using ESOs VLT Survey Telescope (VST). UDG stands for ultra-diffuse galaxy: objects as large as the Milky Way but with 100 1000 times fewer stars. These galaxies are extremely faint and lack star-forming gas, which makes them appear almost like a fluffy cosmic cloud, or a smudge in space. Their origins remain uncertain, but astronomers speculate that they could be failed galaxies that lost their gas supply early in their lifetimes. This image of UDG4 was taken as part of a study from a much larger program, the VST Early-type Galaxy Survey (VEGAS), which aims to investigate very faint structures in galaxy clusters large groups of many galaxies bound together by gravity. The study, led by Enrichetta Iodice from the Istituto Nazionale di Astrofisica in Italy, has found several UDGs in the Hydra Cluster, but more observations are needed to elucidate their true nature. Given their flimsy appearance, UDGs can be difficult to spot. Nevertheless, the VST, equipped with its OmegaCAM camera, provides exquisite sensitivity to light, allowing astronomers to study such elusive objects.

Provider: European Southern Observatory

Image Source: https://www.eso.org/public/images/potw2122a/

Curator: European Southern Observatory, Garching bei München, None, Germany

Image Use Policy: Creative Commons Attribution 4.0 International License

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Image Details

Image Type
Observation
Object Name
UDG4
Subject - Local Universe
Galaxy
Eso_potw2122a_128
 

Position Details

Position (ICRS)
RA = 10h 37m 2.6s
DEC = -27° 12’ 15.6”
Orientation
North is 0.1° CCW
Field of View
1.6 x 1.5 arcminutes
Constellation
Hydra

Color Mapping

  Telescope Spectral Band Wavelength
Blue VST (OmegaCAM) Optical (g) 480.0 nm
Red VST (OmegaCAM) Optical (r) 625.0 nm
Green VST (OmegaCAM) Optical (g) 480.0 nm
Green VST (OmegaCAM) Optical (r) 625.0 nm
Spectrum_base
Blue
Red
Green
Green
Eso_potw2122a_1280
×
ID
potw2122a
Subject Category
C.5  
Subject Name
UDG4
Credits
ESO/Iodice et al.
Release Date
2021-05-31T06:00:00
Lightyears
Redshift
Reference Url
https://www.eso.org/public/images/potw2122a/
Type
Observation
Image Quality
Distance Notes
Facility
VLT Survey Telescope, VLT Survey Telescope, VLT Survey Telescope, VLT Survey Telescope
Instrument
OmegaCAM, OmegaCAM, OmegaCAM, OmegaCAM
Color Assignment
Blue, Red, Green, Green
Band
Optical, Optical, Optical, Optical
Bandpass
g, r, g, r
Central Wavelength
480, 625, 480, 625
Start Time
Integration Time
Dataset ID
None, None, None, None
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
159.2609555, -27.2043202355
Reference Dimension
467.0, 424.0
Reference Pixel
233.5, 212.0
Scale
-5.81583361724e-05, 5.81583361724e-05
Rotation
0.12000000000000054
Coordinate System Projection:
TAN
Quality
Full
FITS Header
Notes
Creator (Curator)
European Southern Observatory
URL
https://www.eso.org
Name
Email
Telephone
Address
Karl-Schwarzschild-Strasse 2
City
Garching bei München
State/Province
None
Postal Code
D-85748
Country
Germany
Rights
Creative Commons Attribution 4.0 International License
Publisher
European Southern Observatory
Publisher ID
eso
Resource ID
potw2122a
Metadata Date
2021-04-13T12:57:04+02:00
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.