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  Far-infrared Herschel SPIRE spectroscopy of lensed starbursts reveals physical conditions of ionized gas

Zhang, Z.-Y., Ivison, R. J., George, R. D., Zhao, Y., Dunne, L., Herrera-Camus, R., et al. (2018). Far-infrared Herschel SPIRE spectroscopy of lensed starbursts reveals physical conditions of ionized gas. Monthly Notices of the Royal Astronomical Society, 481, 59-97.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CA18-D Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CA19-C
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2018MNRAS.481...59Z (Any fulltext)
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 Creators:
Zhang, Zhi-Yu1, Author
Ivison, R. J.1, Author
George, R. D.1, Author
Zhao, Yinghe1, Author
Dunne, L.1, Author
Herrera-Camus, R.1, Author
Lewis, A. J. R.1, Author
Liu, Daizhong1, Author
Naylor, D.1, Author
Oteo, Iván1, Author
Riechers, D. A.1, Author
Smail, Ian1, Author
Yang, Chentao1, Author
Eales, Stephen1, Author
Hopwood, Ros1, Author
Maddox, Steve1, Author
Omont, Alain1, Author
van der Werf, Paul1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: galaxies: active galaxies: high-redshift galaxies: starburst infrared: galaxies submillimetre: galaxies Astrophysics - Astrophysics of Galaxies
 Abstract: The most intensively star-forming galaxies are extremely luminous at far-infrared (FIR) wavelengths, highly obscured at optical and ultraviolet wavelengths, and lie at z ≥ 1-3. We present a programme of FIR spectroscopic observations with the SPIRE FTS, as well as photometric observations with PACS, both on board Herschel, towards a sample of 45 gravitationally lensed, dusty starbursts across z ̃ 1-3.6. In total, we detected 27 individual lines down to 3 σ, including nine [C II] 158 μm lines with confirmed spectroscopic redshifts, five possible [C II] lines consistent with their FIR photometric redshifts, and in some individual sources a few [O III] 88 μm, [O III] 52 μm, [O I] 145 μm, [O I] 63 μm, [N II] 122 μm and OH 119 μm (in absorption) lines. To derive the typical physical properties of the gas in the sample, we stack all spectra weighted by their intrinsic luminosity and by their 500μm flux densities, with the spectra scaled to a common redshift. In the stacked spectra, we detect emission lines of [C II] 158 μm, [N II] 122 μm, [O III] 88 μm, [O III] 52 μm, [O I] 63 μm and the absorption doublet of OH at 119 μm, at high fidelity. We find that the average electron densities traced by the [N II] and [O III] lines are higher than the average values in local star-forming galaxies and ULIRGs, using the same tracers. From the [N II]/[C II] and [O I]/[C II] ratios, we find that the [C II] emission is likely dominated by the photodominated regions (PDR), instead of by ionized gas or large-scale shocks.

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 Dates: 2018
 Publication Status: Issued
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 481 Sequence Number: - Start / End Page: 59 - 97 Identifier: -