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CLASSY. VIII. Explo...
CLASSY. VIII. Exploring the Source of Ionization with UV Interstellar Medium Diagnostics in Local High-z Analogs
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Mingozzi, Matilde (author)
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James, Bethan L. (author)
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Berg, Danielle A. (author)
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Arellano-Córdova, Karla Z. (author)
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Plat, Adele (author)
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Scarlata, Claudia (author)
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Amorin, Ricardo O. (author)
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Aloisi, Alessandra (author)
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Brinchmann, Jarle (author)
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Charlot, Stéphane (author)
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Chisholm, John (author)
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Feltre, Anna (author)
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Gazagnes, Simon (author)
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- Hayes, Matthew J., 1977- (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Heckman, Timothy (author)
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Hernandez, Svea (author)
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Kewley, Lisa J. (author)
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Kumari, Nimisha (author)
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Leitherer, Claus (author)
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Martin, Crystal L. (author)
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Maseda, Michael (author)
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Nanayakkara, Themiya (author)
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Ravindranath, Swara (author)
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Rigby, Jane R. (author)
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Senchyna, Peter (author)
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Skillman, Evan D. (author)
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Sugahara, Yuma (author)
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Wilkins, Stephen M. (author)
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Wofford, Aida (author)
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Xu, Xinfeng (author)
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(creator_code:org_t)
- 2024
- 2024
- English.
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In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 962:1
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Abstract
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- In the current JWST era, rest-frame UV spectra play a crucial role in enhancing our understanding of the interstellar medium (ISM) and stellar properties of the first galaxies in the epoch of reionization (z > 6). Here, we compare well-known and reliable optical diagrams sensitive to the main ionization source (i.e., star formation, SF; active galactic nuclei, AGN; and shocks) to UV counterparts proposed in the literature—the so-called "UV–BPT diagrams"—using the HST COS Legacy Archive Spectroscopic SurveY (CLASSY), which is the largest high-quality, high-resolution, and broad-wavelength range atlas of far-UV spectra for 45 local star-forming galaxies. In particular, we explore where CLASSY UV line ratios are located in the different UV diagnostic plots, taking into account state-of-the-art photoionization and shock models, and, for the first time, the measured ISM and stellar properties (e.g., gas-phase metallicity, ionization parameter, carbon abundance, and stellar age). We find that the combination of C iii] λλ1907,9 He iiλ1640 and O iii] λ1666 can be a powerful tool to separate between SF, shocks, and AGN at subsolar metallicities. We also confirm that alternative diagrams without O iii] λ1666 still allow us to define an SF-locus, with some caveats. Diagrams including C ivλλ1548,51 should be taken with caution given the complexity of this doublet profile. Finally, we present a discussion detailing the ISM conditions required to detect UV emission lines, visible only in low gas-phase metallicity (12 + log(O/H) ≲ 8.3) and high ionization parameter (log(U) ≳ −2.5) environments. Overall, CLASSY and our UV toolkit will be crucial in interpreting the spectra of the earliest galaxies that JWST is currently revealing.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Mingozzi, Matild ...
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James, Bethan L.
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Berg, Danielle A ...
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Arellano-Córdova ...
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Plat, Adele
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Scarlata, Claudi ...
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show more...
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Amorin, Ricardo ...
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Aloisi, Alessand ...
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Brinchmann, Jarl ...
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Charlot, Stéphan ...
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Chisholm, John
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Feltre, Anna
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Gazagnes, Simon
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Hayes, Matthew J ...
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Heckman, Timothy
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Hernandez, Svea
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Kewley, Lisa J.
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Kumari, Nimisha
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Leitherer, Claus
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Martin, Crystal ...
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Maseda, Michael
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Nanayakkara, The ...
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Ravindranath, Sw ...
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Rigby, Jane R.
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Senchyna, Peter
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Skillman, Evan D ...
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Sugahara, Yuma
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Wilkins, Stephen ...
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Wofford, Aida
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Xu, Xinfeng
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show less...
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- NATURAL SCIENCES
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Stockholm University