PHANGS–JWST First Results: Dust-embedded Star Clusters in NGC 7496 Selected via 3.3μm PAH Emission
The earliest stages of star formation occur enshrouded in dust and are not observable in the optical. Here we leverage the extraordinary new high-resolution infrared imaging from JWST to begin the study of dust-embedded star clusters in nearby galaxies throughout the Local Volume. We present a techn...
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2023
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/152610 |
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I19-R120-10915-1526102023-05-09T20:06:31Z http://sedici.unlp.edu.ar/handle/10915/152610 issn:2041-8213 PHANGS–JWST First Results: Dust-embedded Star Clusters in NGC 7496 Selected via 3.3μm PAH Emission Rodríguez, María Jimena 2023 2023-05-09T12:13:28Z en Ciencias Astronómicas Star formation Star clusters Young star clusters Spiral galaxies Surveys Polycyclic aromatic hydrocarbons Interstellar dust The earliest stages of star formation occur enshrouded in dust and are not observable in the optical. Here we leverage the extraordinary new high-resolution infrared imaging from JWST to begin the study of dust-embedded star clusters in nearby galaxies throughout the Local Volume. We present a technique for identifying dustembedded clusters in NGC 7496 (18.7 Mpc), the first galaxy to be observed by the PHANGS–JWST Cycle 1 Treasury Survey. We select sources that have strong 3.3 μm PAH emission based on a F300M − F335M color excess and identify 67 candidate embedded clusters. Only eight of these are found in the PHANGS-HST optically selected cluster catalog, and all are young (six have SED fit ages of ∼1 Myr). We find that this sample of embedded cluster candidates may significantly increase the census of young clusters in NGC 7496 from the PHANGS-HST catalog; the number of clusters younger than ∼2 Myr could be increased by a factor of 2. Candidates are preferentially located in dust lanes and are coincident with the peaks in the PHANGS-ALMA CO (2–1) maps. We take a first look at concentration indices, luminosity functions, SEDs spanning from 2700 Å to 21 μm, and stellar masses (estimated to be between ∼10⁴ and 10⁵ M☉). The methods tested here provide a basis for future work to derive accurate constraints on the physical properties of embedded clusters, characterize the completeness of cluster samples, and expand analysis to all 19 galaxies in the PHANGS–JWST sample, which will enable basic unsolved problems in star formation and cluster evolution to be addressed. La lista completa de autores que integran el documento puede consultarse en el archivo. Instituto de Astrofísica de La Plata Articulo Articulo http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) application/pdf |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Astronómicas Star formation Star clusters Young star clusters Spiral galaxies Surveys Polycyclic aromatic hydrocarbons Interstellar dust |
| spellingShingle |
Ciencias Astronómicas Star formation Star clusters Young star clusters Spiral galaxies Surveys Polycyclic aromatic hydrocarbons Interstellar dust Rodríguez, María Jimena PHANGS–JWST First Results: Dust-embedded Star Clusters in NGC 7496 Selected via 3.3μm PAH Emission |
| topic_facet |
Ciencias Astronómicas Star formation Star clusters Young star clusters Spiral galaxies Surveys Polycyclic aromatic hydrocarbons Interstellar dust |
| description |
The earliest stages of star formation occur enshrouded in dust and are not observable in the optical. Here we leverage the extraordinary new high-resolution infrared imaging from JWST to begin the study of dust-embedded star clusters in nearby galaxies throughout the Local Volume. We present a technique for identifying dustembedded clusters in NGC 7496 (18.7 Mpc), the first galaxy to be observed by the PHANGS–JWST Cycle 1 Treasury Survey. We select sources that have strong 3.3 μm PAH emission based on a F300M − F335M color excess and identify 67 candidate embedded clusters. Only eight of these are found in the PHANGS-HST optically selected cluster catalog, and all are young (six have SED fit ages of ∼1 Myr). We find that this sample of embedded cluster candidates may significantly increase the census of young clusters in NGC 7496 from the PHANGS-HST catalog; the number of clusters younger than ∼2 Myr could be increased by a factor of 2. Candidates are preferentially located in dust lanes and are coincident with the peaks in the PHANGS-ALMA CO (2–1) maps. We take a first look at concentration indices, luminosity functions, SEDs spanning from 2700 Å to 21 μm, and stellar masses (estimated to be between ∼10⁴ and 10⁵ M☉). The methods tested here provide a basis for future work to derive accurate constraints on the physical properties of embedded clusters, characterize the completeness of cluster samples, and expand analysis to all 19 galaxies in the PHANGS–JWST sample, which will enable basic unsolved problems in star formation and cluster evolution to be addressed. |
| format |
Articulo Articulo |
| author |
Rodríguez, María Jimena |
| author_facet |
Rodríguez, María Jimena |
| author_sort |
Rodríguez, María Jimena |
| title |
PHANGS–JWST First Results: Dust-embedded Star Clusters in NGC 7496 Selected via 3.3μm PAH Emission |
| title_short |
PHANGS–JWST First Results: Dust-embedded Star Clusters in NGC 7496 Selected via 3.3μm PAH Emission |
| title_full |
PHANGS–JWST First Results: Dust-embedded Star Clusters in NGC 7496 Selected via 3.3μm PAH Emission |
| title_fullStr |
PHANGS–JWST First Results: Dust-embedded Star Clusters in NGC 7496 Selected via 3.3μm PAH Emission |
| title_full_unstemmed |
PHANGS–JWST First Results: Dust-embedded Star Clusters in NGC 7496 Selected via 3.3μm PAH Emission |
| title_sort |
phangs–jwst first results: dust-embedded star clusters in ngc 7496 selected via 3.3μm pah emission |
| publishDate |
2023 |
| url |
http://sedici.unlp.edu.ar/handle/10915/152610 |
| work_keys_str_mv |
AT rodriguezmariajimena phangsjwstfirstresultsdustembeddedstarclustersinngc7496selectedvia33mmpahemission |
| _version_ |
1765660170753409024 |