Massive Star Formation in a Gravitationally Lensed H<scp>ii</scp>Galaxy at<i>z</i>= 3.357

Fosbury, R. A. E.; Villar-Martı́n, M.; Humphrey, A.; Lombardi, Marco; Rosati, P.; Stern, Daniel; Hook, R. N.; Holden, B. P.; Stanford, S. A.; Squires, G.; Rauch, Michael; Sargent, W. L. W.

doi:10.1086/378228

Cited by 123 publications

(218 citation statements)

References 47 publications

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“…Pioneering detections of rest-frame ultraviolet and optical emission lines at higher redshift, out to z 6, are also mainly limited to few gravitationally lensed sources (e.g. Fosbury et al 2003;Bayliss et al 2014;Stark et al 2015a,b;Zitrin et al 2015). In the near future, new facilities, such as the James Webb Space Telescope (JWST ) and extremely large ground-based telescopes (ELT), will collect high-quality, rest-frame ultraviolet and optical spectra of thousands of high-redshift galaxies, allowing extensive investigations of early galaxy evolution and of the relation between star formation and black-hole growth.…”

Section: Introductionmentioning

confidence: 99%

Nuclear activity versus star formation: emission-line diagnostics at ultraviolet and optical wavelengths

Feltre¹,

Charlot²,

Gutkin³

2016

Mon. Not. R. Astron. Soc.

272

461

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In the context of observations of the rest-frame ultraviolet and optical emission from distant galaxies, we explore the emission-line properties of photoionization models of active and inactive galaxies. Our aim is to identify new line-ratio diagnostics to discriminate between gas photoionization by active galactic nuclei (AGN) and star formation. We use a standard photoionization code to compute the emission from AGN narrow-line regions and compare this with calculations of the nebular emission from star-forming galaxies achieved using the same code. We confirm the appropriateness of widely used optical spectral diagnostics of nuclear activity versus star formation and explore new diagnostics at ultraviolet wavelengths. We find that combinations of a collisionally excited metal line or line multiplet, such as C iv λλ1548, 1551,iii]λ1892 and [C iii]λ1907+C iii]λ1909, with the He ii λ1640 recombination line are individually good discriminants of the nature of the ionizing source. Diagrams involving at least 3 of these lines allow an even more stringent distinction between active and inactive galaxies, as well as valuable constraints on interstellar gas parameters and the shape of the ionizing radiation. Several line ratios involving Ne-based emission lines, such as [Ne iv]λ2424, [Ne iii]λ3343 and [Ne v]λ3426, are also good diagnostics of nuclear activity. Our results provide a comprehensive framework to identify the sources of photoionization and physical conditions of the ionized gas from the ultraviolet and optical nebular emission from galaxies. This will be particularly useful to interpret observations of high-redshift galaxies with future facilities, such as the James Webb Space Telescope and extremely large ground-based telescopes.

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Section: Introductionmentioning

confidence: 99%

Nuclear activity versus star formation: emission-line diagnostics at ultraviolet and optical wavelengths

Feltre¹,

Charlot²,

Gutkin³

2016

Mon. Not. R. Astron. Soc.

272

461

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“…Although we are yet unable to report on the results of our observations of the HeII 1640Å line in KCS 1166, which is a good candidate for PopIII search at z = 6.518, it is well possible that PopIII stars have already been detected by Fosbury et al (2003) in a dwarf star-forming galaxy at z = 3.357, thanks to the fortunate combination of the longer uncontaminated PopIII phase in dwarf galaxies and of the opportunity given by the lensing magnification to identify PopIII stars, even if not at their peak activity.…”

Section: Final Remarksmentioning

confidence: 77%

“…We take this opportunity to draw the attention of the Conference participants and of those interested in PopIII stars to the results obtained by Fosbury et al (2003) on the Lynx arc, since these could well mark the first detection of PopIII stars, and are completely overlooked by the relevant literature. Although we recommend the interested reader to read the paper by Fosbury et al directly, we give here a summary of their work.…”

Section: The Possible Detection Of Popiii Stars In the Lynx Arcmentioning

confidence: 99%

The search for Population III stars

et al. 2008

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Abstract. Population III stars, the first generation of stars formed from primordial Big Bang material with a top-heavy IMF, should contribute substantially to the Universe reionization and they are crucial for understanding the early metal enrichment of galaxies. Therefore it is very important that these objects, foreseen by theories, are detected by observations. However PopIII stars, searched through the HeII 1640Å line signature, have remained elusive. We report about the search for the HeII line in a galaxy at z = 6.5, which is a very promising candidate. Unfortunately we are not yet able to show the results of this search. However we call attention to the possible detection of PopIII stars in a lensed HII dwarf galaxy at z = 3.4, which appeared in the literature some years ago, but has been overlooked.

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“…Thuan & Izotov 2005) or in other peculiar objects (cf. Fosbury et al 2003 anddiscussion in Schaerer 2003b). galaxies with very high W(Lyα), the excess of Lyman continuum flux seen in some LBGs, and the nature of Lyα blobs.…”

Section: Have We Found Pop III In Lyman Break Galaxies?mentioning

confidence: 99%

Searching for Pop III stars and galaxies at high redshift

Schaerer

2008

Proc. IAU

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Abstract. We review the expected properties of Pop III and very metal-poor starbursts and the behaviour the Lyα and He ii λ1640 emission lines, which are most likely the best/easiest signatures to single out such objects. Existing claims of Pop III signatures in distant galaxies are critically examined, and the searches for He ii λ1640 emission at high redshift are summarised. Finally, we briefly summarise ongoing and future deep observations at z > 6 aiming in particular at detecting the sources of cosmic reionisation as well as primeval/Pop III galaxies.

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Massive Star Formation in a Gravitationally Lensed HiiGalaxy atz= 3.357

Cited by 123 publications

References 47 publications

Nuclear activity versus star formation: emission-line diagnostics at ultraviolet and optical wavelengths

Nuclear activity versus star formation: emission-line diagnostics at ultraviolet and optical wavelengths

The search for Population III stars

Searching for Pop III stars and galaxies at high redshift

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