Feedback in emerging extragalactic star clusters, FEAST: The relation between 3.3 $μ$m PAH emission and Star Formation Rate traced by ionized gas in NGC 628
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2024
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866910449187946496 |
|---|---|
| author | Gregg, Benjamin Calzetti, Daniela Adamo, Angela Bajaj, Varun Ryon, Jenna E. Linden, Sean T. Correnti, Matteo Cignoni, Michele Messa, Matteo Sabbi, Elena Gallagher, John S. Grasha, Kathryn Pedrini, Alex Gutermuth, Robert A. Melinder, Jens Kotulla, Ralf Pérez, Gustavo Krumholz, Mark R. Bik, Arjan Östlin, Göran Johnson, Kelsey E. Bortolini, Giacomo Smith, Linda J. Tosi, Monica Maji, Subhransu Vieira, Helena Faustino |
| author_facet | Gregg, Benjamin Calzetti, Daniela Adamo, Angela Bajaj, Varun Ryon, Jenna E. Linden, Sean T. Correnti, Matteo Cignoni, Michele Messa, Matteo Sabbi, Elena Gallagher, John S. Grasha, Kathryn Pedrini, Alex Gutermuth, Robert A. Melinder, Jens Kotulla, Ralf Pérez, Gustavo Krumholz, Mark R. Bik, Arjan Östlin, Göran Johnson, Kelsey E. Bortolini, Giacomo Smith, Linda J. Tosi, Monica Maji, Subhransu Vieira, Helena Faustino |
| contents | We present maps of ionized gas (traced by Pa$α$ and Br$α$) and 3.3 $μ$m Polycyclic Aromatic Hydrocarbon (PAH) emission in the nearby spiral galaxy NGC 628, derived from new JWST/NIRCam data from the FEAST survey. With this data, we investigate and calibrate the relation between 3.3 $μ$m PAH emission and star formation rate (SFR) in and around emerging young star clusters (eYSCs) on a scale of ${\sim}40$ pc. We find a tight (correlation coefficient $ρ$${\sim}$0.9) sub-linear (power-law exponent $α$${\sim}$0.75) relation between the 3.3 $μ$m PAH luminosity surface density and SFR traced by Br$α$ for compact, cospatial (within 0.16$''$ or ${\sim}$7 pc) peaks in Pa$α$, Br$α$, and 3.3 $μ$m (eYSC-I). The scatter in the relationship does not correlate well with variations in local interstellar medium (ISM) metallicity due to a radial metallicity gradient, but rather is likely due to stochastic sampling of the stellar initial mass function (IMF) and variations in the PAH heating and age of our sources. The deviation from a linear relation may be explained by PAH destruction in more intense ionizing environments, variations in age, and IMF stochasticity at intermediate to low luminosities. We test our results with various continuum subtraction techniques using combinations of NIRCam bands and find that they remain robust with only minor differences in the derived slope and intercept. An unexpected discrepancy is identified between the relations of hydrogen recombination lines (Pa$α$ versus Br$α$; H$α$ versus Br$α$). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_09667 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Feedback in emerging extragalactic star clusters, FEAST: The relation between 3.3 $μ$m PAH emission and Star Formation Rate traced by ionized gas in NGC 628 Gregg, Benjamin Calzetti, Daniela Adamo, Angela Bajaj, Varun Ryon, Jenna E. Linden, Sean T. Correnti, Matteo Cignoni, Michele Messa, Matteo Sabbi, Elena Gallagher, John S. Grasha, Kathryn Pedrini, Alex Gutermuth, Robert A. Melinder, Jens Kotulla, Ralf Pérez, Gustavo Krumholz, Mark R. Bik, Arjan Östlin, Göran Johnson, Kelsey E. Bortolini, Giacomo Smith, Linda J. Tosi, Monica Maji, Subhransu Vieira, Helena Faustino Astrophysics of Galaxies We present maps of ionized gas (traced by Pa$α$ and Br$α$) and 3.3 $μ$m Polycyclic Aromatic Hydrocarbon (PAH) emission in the nearby spiral galaxy NGC 628, derived from new JWST/NIRCam data from the FEAST survey. With this data, we investigate and calibrate the relation between 3.3 $μ$m PAH emission and star formation rate (SFR) in and around emerging young star clusters (eYSCs) on a scale of ${\sim}40$ pc. We find a tight (correlation coefficient $ρ$${\sim}$0.9) sub-linear (power-law exponent $α$${\sim}$0.75) relation between the 3.3 $μ$m PAH luminosity surface density and SFR traced by Br$α$ for compact, cospatial (within 0.16$''$ or ${\sim}$7 pc) peaks in Pa$α$, Br$α$, and 3.3 $μ$m (eYSC-I). The scatter in the relationship does not correlate well with variations in local interstellar medium (ISM) metallicity due to a radial metallicity gradient, but rather is likely due to stochastic sampling of the stellar initial mass function (IMF) and variations in the PAH heating and age of our sources. The deviation from a linear relation may be explained by PAH destruction in more intense ionizing environments, variations in age, and IMF stochasticity at intermediate to low luminosities. We test our results with various continuum subtraction techniques using combinations of NIRCam bands and find that they remain robust with only minor differences in the derived slope and intercept. An unexpected discrepancy is identified between the relations of hydrogen recombination lines (Pa$α$ versus Br$α$; H$α$ versus Br$α$). |
| title | Feedback in emerging extragalactic star clusters, FEAST: The relation between 3.3 $μ$m PAH emission and Star Formation Rate traced by ionized gas in NGC 628 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2405.09667 |