Deep rest-frame far-UV spectroscopy of the giant Lyman α emitter 'Himiko'
| Autor: | Peter Laursen, Masami Ouchi, Johan P. U. Fynbo, Per Kjaergaard, Hans Ulrik Nørgaard-Nielsen, Johannes Zabl |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
FOS: Physical sciences Astrophysics Radiation 01 natural sciences Imaging data star formation [Galaxies] Gravitation high-redshift [Galaxies] Ultraviolet visible spectroscopy individual: Himiko [Galaxies] Population III [Stars] 0103 physical sciences α emitter Spectroscopy 010303 astronomy & astrophysics Physics 010308 nuclear & particles physics Astronomy Astronomy and Astrophysics Rest frame Astrophysics - Astrophysics of Galaxies Redshift 13. Climate action Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Zabl, J, Nørgaard-Nielsen, H U, Fynbo, J P U, Laursen, P, Ouchi, M & Kjaergaard, P 2015, ' Deep rest-frame far-UV spectroscopy of the giant Lyman α emitter 'Himiko' ', Monthly Notices of the Royal Astronomical Society, vol. 451, no. 2, pp. 2050-2070 . https://doi.org/10.1093/mnras/stv1019 |
| DOI: | 10.1093/mnras/stv1019 |
| Popis: | We present deep 10 h VLT/XSHOOTER spectroscopy for an extraordinarily luminous and extended Ly alpha emitter at z = 6.595 referred to asHimiko and first discussed by Ouchi et al., with the purpose of constraining the mechanisms powering its strong emission. Complementary to the spectrum, we discuss near-infrared imaging data from the CANDELS survey. We find neither for He II nor any metal line a significant excess, with 3 σ upper limits of 6.8, 3.1, and 5.8 x 10-18 erg s-1 cm-2 for C IV λ 1549, He II λ 1640, C III] λ 1909, respectively, assuming apertures with 200 km s-1 widths and offset by -250 km s-1 w.r.t. to the peak Ly α redshift. These limits provide strong evidence that an AGN is not a major contribution to Himiko's Ly α flux. Strong conclusions about the presence of Pop III star formation or gravitational cooling radiation are not possible based on the obtained He II upper limit. Our Ly alpha spectrum confirms both spatial extent and flux (8.8 +/- 0.5 x 10-17 erg s -1 cm-2) of previous measurements. In addition, we can unambiguously exclude any remaining chance of it being a lower redshift interloper by significantly detecting a continuum redwards of Ly α, while being undetected bluewards. |
| Databáze: | OpenAIRE |
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