The dancer in Dorado

Esahubble_potw2344a_1024

esahubble_potw2344a October 30th, 2023

Credit: ESA/Hubble & NASA, D. Calzetti and the LEGUS team, R. Chandar

This vibrant and dynamic-looking image features the spiral galaxy NGC 1566, which is sometimes informally referred to as the ‘Spanish Dancer Galaxy’. Like the subject of another recent Hubble Picture of the Week, NGC 1566 is a weakly-barred or intermediate spiral galaxy, meaning that it does not have either a clearly present or a clearly absent bar-shaped structure at its centre. The galaxy owes its nickname to the vivid and dramatic swirling lines of its spiral arms, which could evoke the shapes and colours of a dancer’s moving form. NGC 1566 lies around 60 million light-years from Earth in the constellation Dorado, and is also a member of the Dorado galaxy group.  Galaxy groups are assemblages of gravitationally bound galaxies. Groups differ from galaxy clusters in size and mass: galaxy clusters may contain hundreds of galaxies, whereas groups might contain several tens of galaxies. That said, there is not a precise delineation between the definition of a galaxy group and a galaxy cluster. Some astronomers have proposed that the definitions be sharpened up, with one suggestion that galaxy aggregations with less mass than 80 trillion Suns should qualify as galaxy groups.  The Dorado group has had a fluctuating membership over the past few decades, with various scientific papers changing its list of constituent galaxies. As an example of why it is so challenging for astronomers to pin down members of groups such as the Dorado group, we can imagine a photograph of an adult human and a large oak tree. We have foreknowledge of the approximate size of the person and the tree, so if we were to see a photo where the person appeared roughly the same size as the tree, then we would be able to guess that, in reality, the person was positioned much closer to the camera than the tree was, giving the false impression that they were the same size. When working out members of a galaxy group, astronomers are not necessarily equipped with the knowledge of the size of the individual galaxies, and so have to work out whether galaxies really are relatively close together in space, or whether some of them are actually much closer or much further away. This has become easier with more sophisticated observation techniques, but still sometimes presents a challenge. [Image Description: A spiral galaxy. The entire galaxy is displayed, centred and face-on to the viewer. It has two spiral arms that each make only a half-turn from start to finish, resembling the shape of a comma. Lanes of dark dust follow the arms into the centre, and split into many fibres that swirl around the glowing galactic core. Bright pink blooms along the arms show areas of new star formation.] Links Pan: The dancer in Dorado

Provider: Hubble Space Telescope | ESA

Image Source: https://esahubble.org/images/potw2344a/

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

Image Use Policy: Creative Commons Attribution 4.0 International License

Image Details

Image Type
Observation
Object Name
NGC 1566
Esahubble_potw2344a_128
 

Position Details

Position (ICRS)
RA = 4h 20m 0.5s
DEC = -54° 56’ 15.3”
Orientation
North is 140.9° CW
Field of View
2.6 x 2.7 arcminutes
Constellation
Dorado

Color Mapping

  Telescope Spectral Band Wavelength
Purple Hubble (WFC3) Ultraviolet (UV) 275.0 nm
Purple Hubble (WFC3) Optical (U) 336.0 nm
Blue Hubble (WFC3) Optical (B) 438.0 nm
Green Hubble (WFC3) Optical (V) 555.0 nm
Orange Hubble (WFC3) Optical (I) 814.0 nm
Red Hubble (WFC3) Optical (N II) 658.0 nm
Spectrum_base
Purple
Purple
Blue
Green
Orange
Red
Esahubble_potw2344a_1280
×
ID
potw2344a
Subject Category
Subject Name
NGC 1566
Credits
ESA/Hubble & NASA, D. Calzetti and the LEGUS team, R. Chandar
Release Date
2023-10-30T06:00:00
Lightyears
Redshift
Reference Url
https://esahubble.org/images/potw2344a/
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
Instrument
WFC3, WFC3, WFC3, WFC3, WFC3, WFC3
Color Assignment
Purple, Purple, Blue, Green, Orange, Red
Band
Ultraviolet, Optical, Optical, Optical, Optical, Optical
Bandpass
UV, U, B, V, I, N II
Central Wavelength
275, 336, 438, 555, 814, 658
Start Time
Integration Time
Dataset ID
None, None, None, None, None, None
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
65.00205729431518, -54.93757656525936
Reference Dimension
3869.0, 4165.0
Reference Pixel
1934.5, 2082.5
Scale
-1.0992377610763402e-05, 1.0992377610763402e-05
Rotation
-140.94000000000031
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
potw2344a
Metadata Date
2023-10-26T13:15:09+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.

 

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