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Compact [C II] emitters around a C IV absorption complex at redshift 5.7
Daichi Kashino1,2, Simon J Lilly3, Robert A Simcoe4
1Institute for Advanced Research, Nagoya University, Nagoya, Japan. kashinod.astro@gmail.com.
We detected two [C sup II]-emitting galaxies near redshift 5.7, associated with a high-ionization gas system. These galaxies exhibit compact sizes and narrow linewidths, suggesting obscured star formation during cosmic reionization.
Area of Science:
- Cosmic reionization
- Galaxy evolution
- Intergalactic medium physics
Background:
- Circumgalactic medium conditions are investigated using quasar absorption lines.
- A link between gas ionization state and galaxy properties is suggested.
- Cosmic reionization involves global changes in absorption systems.
Purpose of the Study:
- To investigate the physical conditions of the circumgalactic medium.
- To explore the connection between [C sup II] emission and galaxy properties.
- To understand the high ionization state of gas during cosmic reionization.
Main Methods:
- Analysis of intervening absorption-line systems in background quasar spectra.
- Detection of [C sup II]-emitting galaxies at redshift z ≈ 5.7.
- Comparison with hydrodynamic simulations.
Main Results:
- Two [C sup II]-emitting galaxies detected at z ≈ 5.7, linked to a high-ionization C sup IV system.
- Detected galaxies are part of an overdensity, with compact sizes (<2.4 kpc) and narrow linewidths (FWHM ≈ 62-64 km/s).
- Lack of UV counterparts suggests severe obscuration of the [C sup II] emission sources.
Conclusions:
- The findings suggest a connection between [C sup II] emission properties, galaxy overdensities, and high gas ionization states.
- Narrow [C sup II] emission may originate from heated cold neutral medium clumps or compact photodissociation regions.
- Severe obscuration of star formation in early galaxies is indicated.
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