One cluster or two?

Esahubble_potw2348a_1024

esahubble_potw2348a November 27th, 2023

Credit: ESA/Hubble & NASA, G. Smith, H. Ebeling, D. Coe

This Hubble Picture of the Week features a massive cluster of brightly glowing galaxies, first identified as Abell 3192. Like all galaxy clusters, this one is suffused with hot gas that emits powerful X-rays, and it is enveloped in a halo of invisible dark matter. All this unseen material — not to mention the many galaxies visible in this image — comprises such a huge amount of mass that the galaxy cluster noticeably curves spacetime around it, making it into a gravitational lens. Smaller galaxies behind the cluster appear distorted into long, warped arcs around the cluster’s edges. The galaxy cluster is located in the constellation Eridanus, but the question of its distance from Earth is a more complicated one. Abell 3192 was originally documented in the 1989 update of the Abell catalogue, a catalogue of galaxy clusters that was first published in 1958. At that time, Abell 3192 was thought to comprise a single cluster of galaxies, concentrated at a single distance. However, further research revealed something surprising: the cluster’s mass seemed to be densest at two distinct points rather than one.  It was subsequently shown that the original Abell cluster actually comprised two independent galaxy clusters — a foreground group around 2.3 billion light-years from Earth, and a further group at the greater distance of about 5.4 billion light-years from our planet. The more distant galaxy cluster, included in the Massive Cluster Survey as MCS J0358.8-2955, is central in this image. The two galaxy groups are thought to have masses equivalent to around 30 trillion and 120 trillion times the mass of the Sun, respectively. Both of the two largest galaxies at the centre of this image are part of MCS J0358.8-2955; the smaller galaxies you see here, however, are a mixture of the two groups within Abell 3192. [Image Description: A cluster of galaxies, concentrated around what appear to be two large elliptical galaxies. The rest of the black background is covered in smaller galaxies of all shapes and sizes. In the top left and bottom right, beside the two large galaxies, some galaxies appear notably distorted into curves by gravity.] Links Science paper by V. Hamilton-Morris et al. Pan: One cluster or two?

Provider: Hubble Space Telescope | ESA

Image Source: https://esahubble.org/images/potw2348a/

Curator: ESA/Hubble, Baltimore, MD, United States

Image Use Policy: Creative Commons Attribution 4.0 International License

Image Details

Image Type
Observation
Object Name
Abell 3192 MCS J0358.8-2955
Esahubble_potw2348a_128
 

Position Details

Position (ICRS)
RA = 3h 58m 52.5s
DEC = -29° 55’ 37.6”
Orientation
North is 6.9° CCW
Field of View
3.1 x 2.8 arcminutes
Constellation
Eridanus

Color Mapping

  Telescope Spectral Band Wavelength
Blue Hubble (ACS) Optical (B) 435.0 nm
Cyan Hubble (ACS) Optical (V) 606.0 nm
Green Hubble (ACS) Optical (I) 814.0 nm
Orange Hubble (WFC3) Infrared (Y) 1.1 µm
Orange Hubble (WFC3) Infrared (J) 1.3 µm
Red Hubble (WFC3) Infrared (JH) 1.4 µm
Red Hubble (WFC3) Infrared (H) 1.6 µm
Spectrum_base
Blue
Cyan
Green
Orange
Orange
Red
Red
Esahubble_potw2348a_1280
×
ID
potw2348a
Subject Category
Subject Name
Abell 3192, MCS J0358.8-2955
Credits
ESA/Hubble & NASA, G. Smith, H. Ebeling, D. Coe
Release Date
2023-11-27T06:00:00
Lightyears
Redshift
Reference Url
https://esahubble.org/images/potw2348a/
Type
Observation
Image Quality
Distance Notes
Facility
Hubble Space Telescope, Hubble Space Telescope, Hubble Space Telescope, Hubble Space Telescope, Hubble Space Telescope, Hubble Space Telescope, Hubble Space Telescope
Instrument
ACS, ACS, ACS, WFC3, WFC3, WFC3, WFC3
Color Assignment
Blue, Cyan, Green, Orange, Orange, Red, Red
Band
Optical, Optical, Optical, Infrared, Infrared, Infrared, Infrared
Bandpass
B, V, I, Y, J, JH, H
Central Wavelength
435, 606, 814, 1050, 1250, 1400, 1600
Start Time
Integration Time
Dataset ID
None, None, None, None, None, None, None
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
59.71854503960833, -29.927117907181145
Reference Dimension
4614.0, 4210.0
Reference Pixel
2307.0, 2105.0
Scale
-1.1097832614472554e-05, 1.1097832614472554e-05
Rotation
6.9199999999999955
Coordinate System Projection:
TAN
Quality
Full
FITS Header
Notes
Creator (Curator)
ESA/Hubble
URL
https://esahubble.org
Name
Email
Telephone
Address
ESA Office, Space Telescope Science Institute, 3700 San Martin Dr
City
Baltimore
State/Province
MD
Postal Code
21218
Country
United States
Rights
Creative Commons Attribution 4.0 International License
Publisher
ESA/Hubble
Publisher ID
esahubble
Resource ID
potw2348a
Metadata Date
2023-11-23T16:39:55+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.

 

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