@article{matthee_deciphering_2021,
	title = {Deciphering stellar metallicities in the early {Universe}: a case study of a young galaxy at z = 4.77 in the {MUSE} {eXtremely} {Deep} {Field}},
	shorttitle = {Deciphering stellar metallicities in the early {Universe}},
	url = {http://arxiv.org/abs/2111.14855},
	abstract = {Directly characterising the first generations of stars in distant galaxies is a key quest of observational cosmology. Here, we present a case study of ID53 at z = 4.77, the UV-brightest (yet L*) star-forming galaxy at z {\textgreater} 3 in the MUSE eXtremely Deep Field with a mass of {\textasciitilde}\$10{\textasciicircum}9\$ M\$\_\{{\textbackslash}odot\}\$. Besides very strong Lyman-\${\textbackslash}alpha\$ (Ly\${\textbackslash}alpha\$) emission, we clearly detect the (stellar) continuum and a NV P-Cygni feature, interstellar absorption, fine-structure emission and nebular CIV emission-lines in the 140 hr spectrum. Continuum emission from spatially resolved components in the HST data are blended in the MUSE data, but we show that the nebular CIV emission originates from a subcomponent of the galaxy. The UV spectrum can be fit with recent BPASS stellar population models combined with single burst or continuous star formation histories (SFHs), a standard initial mass function and attenuation law. Models with a young age and low metallicity (log10(age/yr)=6.5-7.6 and [Z/H]=-2.15 to -1.15) are preferred. The intrinsic H\${\textbackslash}alpha\$ luminosity of the best-fit models is an order of magnitude higher than the H\${\textbackslash}alpha\$ luminosity inferred from Spitzer/IRAC data, which either suggests a high escape fraction of ionising photons, a high relative nebular to stellar dust attenuation or a complex star formation history. The metallicity appears lower than the metallicity in more massive galaxies at z = 3 - 5, consistent with the picture in which younger galaxies have lower metallicities. Such chemical immaturity likely facilitates Ly\${\textbackslash}alpha\$ escape, explaining why the Ly\${\textbackslash}alpha\$ equivalent width anti-correlates with stellar metallicity. Finally, we stress that uncertainties in SFHs impose a challenge for future inferences of the stellar metallicity of young galaxies. This highlights the need for joint (spatially resolved) analyses of stellar spectra and photo-ionisation models.},
	urldate = {2021-12-06},
	journal = {arXiv:2111.14855 [astro-ph]},
	author = {Matthee, Jorryt and Feltre, Anna and Maseda, Michael and Nanayakkara, Themiya and Boogaard, Leindert and Bacon, Roland and Verhamme, Anne and Leclercq, Floriane and Kusakabe, Haruka and Urrutia, Tanya and Wisotzki, Lutz},
	month = nov,
	year = {2021},
	note = {arXiv: 2111.14855},
	keywords = {Astrophysics - Astrophysics of Galaxies},
}

{"_id":"ZnEnaYakNJEByjncZ","bibbaseid":"matthee-feltre-maseda-nanayakkara-boogaard-bacon-verhamme-leclercq-etal-decipheringstellarmetallicitiesintheearlyuniverseacasestudyofayounggalaxyatz477inthemuseextremelydeepfield-2021","author_short":["Matthee, J.","Feltre, A.","Maseda, M.","Nanayakkara, T.","Boogaard, L.","Bacon, R.","Verhamme, A.","Leclercq, F.","Kusakabe, H.","Urrutia, T.","Wisotzki, L."],"bibdata":{"bibtype":"article","type":"article","title":"Deciphering stellar metallicities in the early Universe: a case study of a young galaxy at z = 4.77 in the MUSE eXtremely Deep Field","shorttitle":"Deciphering stellar metallicities in the early Universe","url":"http://arxiv.org/abs/2111.14855","abstract":"Directly characterising the first generations of stars in distant galaxies is a key quest of observational cosmology. Here, we present a case study of ID53 at z = 4.77, the UV-brightest (yet L*) star-forming galaxy at z \\textgreater 3 in the MUSE eXtremely Deep Field with a mass of \\textasciitilde\\$10{\\textasciicircum}9\\$ M\\$_\\{{\\textbackslash}odot\\}\\$. Besides very strong Lyman-\\${\\textbackslash}alpha\\$ (Ly\\${\\textbackslash}alpha\\$) emission, we clearly detect the (stellar) continuum and a NV P-Cygni feature, interstellar absorption, fine-structure emission and nebular CIV emission-lines in the 140 hr spectrum. Continuum emission from spatially resolved components in the HST data are blended in the MUSE data, but we show that the nebular CIV emission originates from a subcomponent of the galaxy. The UV spectrum can be fit with recent BPASS stellar population models combined with single burst or continuous star formation histories (SFHs), a standard initial mass function and attenuation law. Models with a young age and low metallicity (log10(age/yr)=6.5-7.6 and [Z/H]=-2.15 to -1.15) are preferred. The intrinsic H\\${\\textbackslash}alpha\\$ luminosity of the best-fit models is an order of magnitude higher than the H\\${\\textbackslash}alpha\\$ luminosity inferred from Spitzer/IRAC data, which either suggests a high escape fraction of ionising photons, a high relative nebular to stellar dust attenuation or a complex star formation history. The metallicity appears lower than the metallicity in more massive galaxies at z = 3 - 5, consistent with the picture in which younger galaxies have lower metallicities. Such chemical immaturity likely facilitates Ly\\${\\textbackslash}alpha\\$ escape, explaining why the Ly\\${\\textbackslash}alpha\\$ equivalent width anti-correlates with stellar metallicity. Finally, we stress that uncertainties in SFHs impose a challenge for future inferences of the stellar metallicity of young galaxies. This highlights the need for joint (spatially resolved) analyses of stellar spectra and photo-ionisation models.","urldate":"2021-12-06","journal":"arXiv:2111.14855 [astro-ph]","author":[{"propositions":[],"lastnames":["Matthee"],"firstnames":["Jorryt"],"suffixes":[]},{"propositions":[],"lastnames":["Feltre"],"firstnames":["Anna"],"suffixes":[]},{"propositions":[],"lastnames":["Maseda"],"firstnames":["Michael"],"suffixes":[]},{"propositions":[],"lastnames":["Nanayakkara"],"firstnames":["Themiya"],"suffixes":[]},{"propositions":[],"lastnames":["Boogaard"],"firstnames":["Leindert"],"suffixes":[]},{"propositions":[],"lastnames":["Bacon"],"firstnames":["Roland"],"suffixes":[]},{"propositions":[],"lastnames":["Verhamme"],"firstnames":["Anne"],"suffixes":[]},{"propositions":[],"lastnames":["Leclercq"],"firstnames":["Floriane"],"suffixes":[]},{"propositions":[],"lastnames":["Kusakabe"],"firstnames":["Haruka"],"suffixes":[]},{"propositions":[],"lastnames":["Urrutia"],"firstnames":["Tanya"],"suffixes":[]},{"propositions":[],"lastnames":["Wisotzki"],"firstnames":["Lutz"],"suffixes":[]}],"month":"November","year":"2021","note":"arXiv: 2111.14855","keywords":"Astrophysics - Astrophysics of Galaxies","bibtex":"@article{matthee_deciphering_2021,\n\ttitle = {Deciphering stellar metallicities in the early {Universe}: a case study of a young galaxy at z = 4.77 in the {MUSE} {eXtremely} {Deep} {Field}},\n\tshorttitle = {Deciphering stellar metallicities in the early {Universe}},\n\turl = {http://arxiv.org/abs/2111.14855},\n\tabstract = {Directly characterising the first generations of stars in distant galaxies is a key quest of observational cosmology. Here, we present a case study of ID53 at z = 4.77, the UV-brightest (yet L*) star-forming galaxy at z {\\textgreater} 3 in the MUSE eXtremely Deep Field with a mass of {\\textasciitilde}\\$10{\\textasciicircum}9\\$ M\\$\\_\\{{\\textbackslash}odot\\}\\$. Besides very strong Lyman-\\${\\textbackslash}alpha\\$ (Ly\\${\\textbackslash}alpha\\$) emission, we clearly detect the (stellar) continuum and a NV P-Cygni feature, interstellar absorption, fine-structure emission and nebular CIV emission-lines in the 140 hr spectrum. Continuum emission from spatially resolved components in the HST data are blended in the MUSE data, but we show that the nebular CIV emission originates from a subcomponent of the galaxy. The UV spectrum can be fit with recent BPASS stellar population models combined with single burst or continuous star formation histories (SFHs), a standard initial mass function and attenuation law. Models with a young age and low metallicity (log10(age/yr)=6.5-7.6 and [Z/H]=-2.15 to -1.15) are preferred. The intrinsic H\\${\\textbackslash}alpha\\$ luminosity of the best-fit models is an order of magnitude higher than the H\\${\\textbackslash}alpha\\$ luminosity inferred from Spitzer/IRAC data, which either suggests a high escape fraction of ionising photons, a high relative nebular to stellar dust attenuation or a complex star formation history. The metallicity appears lower than the metallicity in more massive galaxies at z = 3 - 5, consistent with the picture in which younger galaxies have lower metallicities. Such chemical immaturity likely facilitates Ly\\${\\textbackslash}alpha\\$ escape, explaining why the Ly\\${\\textbackslash}alpha\\$ equivalent width anti-correlates with stellar metallicity. Finally, we stress that uncertainties in SFHs impose a challenge for future inferences of the stellar metallicity of young galaxies. This highlights the need for joint (spatially resolved) analyses of stellar spectra and photo-ionisation models.},\n\turldate = {2021-12-06},\n\tjournal = {arXiv:2111.14855 [astro-ph]},\n\tauthor = {Matthee, Jorryt and Feltre, Anna and Maseda, Michael and Nanayakkara, Themiya and Boogaard, Leindert and Bacon, Roland and Verhamme, Anne and Leclercq, Floriane and Kusakabe, Haruka and Urrutia, Tanya and Wisotzki, Lutz},\n\tmonth = nov,\n\tyear = {2021},\n\tnote = {arXiv: 2111.14855},\n\tkeywords = {Astrophysics - Astrophysics of Galaxies},\n}\n\n","author_short":["Matthee, J.","Feltre, A.","Maseda, M.","Nanayakkara, T.","Boogaard, L.","Bacon, R.","Verhamme, A.","Leclercq, F.","Kusakabe, H.","Urrutia, T.","Wisotzki, L."],"key":"matthee_deciphering_2021","id":"matthee_deciphering_2021","bibbaseid":"matthee-feltre-maseda-nanayakkara-boogaard-bacon-verhamme-leclercq-etal-decipheringstellarmetallicitiesintheearlyuniverseacasestudyofayounggalaxyatz477inthemuseextremelydeepfield-2021","role":"author","urls":{"Paper":"http://arxiv.org/abs/2111.14855"},"keyword":["Astrophysics - Astrophysics of Galaxies"],"metadata":{"authorlinks":{}}},"bibtype":"article","biburl":"https://bibbase.org/zotero/polyphant","dataSources":["7gvjSdWrEu7z5vjjj"],"keywords":["astrophysics - astrophysics of galaxies"],"search_terms":["deciphering","stellar","metallicities","early","universe","case","study","young","galaxy","muse","extremely","deep","field","matthee","feltre","maseda","nanayakkara","boogaard","bacon","verhamme","leclercq","kusakabe","urrutia","wisotzki"],"title":"Deciphering stellar metallicities in the early Universe: a case study of a young galaxy at z = 4.77 in the MUSE eXtremely Deep Field","year":2021}