(UV-B) colour index in NGC 1232

Eso_eso9920k_1024

eso_eso9920k February 27th, 1999

Credit: ESO

This is a computer processed "(U-B) colour-index image" of NGC 1232. This technique allows to show the "difference" between images of the galaxy, as seen in different wavebands. Since different types of objects have different brightness in different colours, this method is very useful to locate objects of a particular type and to obtain an overview of their distribution in the galaxy. The photo is based on two individual images of NGC 1232 obtained by the FORS1 Commissioning Team at the ESO VLT UT1 on 20 September 1998. They were taken in ultraviolet ("U-band") and blue ("B-band") light. The exposure times were 10 min and 6 min, respectively. To obtain this colour-index image, the two images were carefully recentered and then divided numerically. Star formation regions that emit strong ultraviolet light therefore appear as particularly bright areas in this colour-index image. They trace the shock fronts of the gas in the spiral arms. The field measures about 5.5 x 5.5 arcmin 2. North is up and East is left.

Provider: European Southern Observatory

Image Source: https://www.eso.org/public/images/eso9920k/

Curator: European Southern Observatory, 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 1232
Subject - Local Universe
Galaxy > Type > Spiral
Eso_eso9920k_128
 

Position Details

Position (ICRS)
RA = 3h 9m 47.2s
DEC = -20° 34’ 28.3”
Orientation
North is 0.1° CCW
Field of View
5.4 x 6.0 arcminutes
Constellation
Eridanus

Color Mapping

  Telescope Spectral Band Wavelength
Orange VLT (FORS1) Optical (B) -
Orange VLT (FORS1) Ultraviolet (U) -
Eso_eso9920k_1280
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ID
eso9920k
Subject Category
C.5.1.1  
Subject Name
NGC 1232
Credits
ESO
Release Date
1999-02-27T00:00:00
Lightyears
Redshift
Reference Url
https://www.eso.org/public/images/eso9920k/
Type
Observation
Image Quality
Distance Notes
Facility
Very Large Telescope, Very Large Telescope
Instrument
FORS1, FORS1
Color Assignment
Orange, Orange
Band
Optical, Ultraviolet
Bandpass
B, U
Central Wavelength
Start Time
Integration Time
Dataset ID
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
47.4468449769, -20.5745345997
Reference Dimension
1152.0, 1281.0
Reference Pixel
576.0, 640.0
Scale
-7.76726091086e-05, 7.76726091086e-05
Rotation
0.0600000000000009
Coordinate System Projection:
TAN
Quality
Full
FITS Header
Notes
Creator (Curator)
European Southern Observatory
URL
http://www.eso.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
European Southern Observatory
Publisher ID
eso
Resource ID
eso9920k
Metadata Date
2009-02-04T14:25:21+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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