Spectrum of arc in cluster 1ESO657-558 (z=3.23)
eso_eso9920w February 27th, 1999
Credit: ESO
This chart displays the spectrum of the most prominent gravitational arc in the galaxy cluster 1ES 0657-558, as obtained at VLT UT1 with the FORS1 instrument in December 1998. The total exposure time was 1.5 hours. It shows absorption lines of hydrogen (Lyman-alpha and Lyman-beta) as well as lines of silicium, oxygen carbon and iron. From the measured wavelengths, the redshift of the arc is determined as z = 3.23. An earlier, much less accurate photometric redshift estimate (from the observed colours) is confirmed and refined by this spectral observation. Star forming galaxies at lower redshifts have very similar spectra. It is therefore concluded that this arc is the gravitationally distorted image of a distant galaxy caught in its formation stage, when the Universe was only about 2 billion (2,000 million) years old.
Provider: European Southern Observatory
Image Source: https://www.eso.org/public/images/eso9920w/
Curator: European Southern Observatory, Garching bei München, Germany
Image Use Policy: Creative Commons Attribution 4.0 International License
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Image Details
Color Mapping
- ID
- eso9920w
- Subject Category
- D.5.5.3
- Subject Name
- 1ES 0657-558, Spectrum
- Credits
- ESO
- Release Date
- 1999-02-27T00:00:00
- Lightyears
- Redshift
- Reference Url
- https://www.eso.org/public/images/eso9920w/
- Type
- Observation
- Image Quality
- Distance Notes
- Facility
- Very Large Telescope
- Instrument
- FORS1
- Color Assignment
- Pseudocolor
- Band
- Optical
- Bandpass
- Central Wavelength
- Start Time
- Integration Time
- Dataset ID
- Notes
- Coordinate Frame
- Equinox
- Reference Value
- Reference Dimension
- 2997.0, 1902.0
- Reference Pixel
- Scale
- Rotation
- Coordinate System Projection:
- Quality
- FITS Header
- Notes
- Creator (Curator)
- European Southern Observatory
- URL
- http://www.eso.org/
- Name
- 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
- eso9920w
- Resource URL
- https://www.eso.org/public/archives/images/original/eso9920w.tif
- Related Resources
- Metadata Date
- 2010-03-01T11:09:53+01:00
- Metadata Version
- 1.1
Detailed color mapping information coming soon...
