The Resolved Behavior of Dust Mass, Polycyclic Aromatic Hydrocarbon Fraction, and Radiation Field in ~ 800 Nearby Galaxies
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Chastenet, Jérémy Sandstrom, Karin M. Leroy, Adam K. Bot, Caroline Chiang, I-Da Chown, Ryan Gordon, Karl D. Koch, Eric W. Roussel, Hélène Sutter, Jessica Williams, Thomas G. |
| author_facet | Chastenet, Jérémy Sandstrom, Karin M. Leroy, Adam K. Bot, Caroline Chiang, I-Da Chown, Ryan Gordon, Karl D. Koch, Eric W. Roussel, Hélène Sutter, Jessica Williams, Thomas G. |
| contents | We present resolved $3.6-250~μ$m dust spectral energy distribution (SED) fitting for $\sim 800$ nearby galaxies. We measure the distribution of radiation field intensities heating the dust, the dust mass surface density ($Σ_{\rm d}$), and the fraction of dust in the form of polycyclic aromatic hydrocarbons (PAHs; $q_{\rm PAH}$). We find that the average interstellar radiation field ($\overline{U}$) is correlated both with stellar mass surface density ($Σ_{\star}$) and star formation rate surface density ($Σ_{\rm SFR}$), while more intense radiation fields are only correlated with $Σ_{\rm SFR}$. We show that $q_{\rm PAH}$ is a steeply decreasing function of $Σ_{\rm SFR}$, likely reflecting PAH destruction in H II regions. Galaxy integrated $q_{\rm PAH}$ is strongly, negatively correlated with specific star formation rate (sSFR) and offset from the star-forming ``main sequence'' ($Δ$MS), suggesting that both metallicity and star formation intensity play a role in setting the global $q_{\rm PAH}$. We also find a nearly constant M$_{\rm d}$/M$_\star$ ratio for galaxies on the main sequence, with a lower ratio for more quiescent galaxies, likely due to their lower gas fractions. From these results, we construct prescriptions to estimate the radiation field distribution in both integrated and resolved galaxies. We test these prescriptions by comparing our predicted $\overline{U}$ to results of SED fitting for stacked "main sequence" galaxies at $0<z<4$ from Béthermin et al. (2015) and find sSFR is an accurate predictor of $\overline{U}$ even at these high redshifts. Finally, we describe the public delivery of matched-resolution WISE and Herschel maps along with the resolved dust SED fitting results through the InfraRed Science Archive (IRSA). |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_03835 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Resolved Behavior of Dust Mass, Polycyclic Aromatic Hydrocarbon Fraction, and Radiation Field in ~ 800 Nearby Galaxies Chastenet, Jérémy Sandstrom, Karin M. Leroy, Adam K. Bot, Caroline Chiang, I-Da Chown, Ryan Gordon, Karl D. Koch, Eric W. Roussel, Hélène Sutter, Jessica Williams, Thomas G. Astrophysics of Galaxies We present resolved $3.6-250~μ$m dust spectral energy distribution (SED) fitting for $\sim 800$ nearby galaxies. We measure the distribution of radiation field intensities heating the dust, the dust mass surface density ($Σ_{\rm d}$), and the fraction of dust in the form of polycyclic aromatic hydrocarbons (PAHs; $q_{\rm PAH}$). We find that the average interstellar radiation field ($\overline{U}$) is correlated both with stellar mass surface density ($Σ_{\star}$) and star formation rate surface density ($Σ_{\rm SFR}$), while more intense radiation fields are only correlated with $Σ_{\rm SFR}$. We show that $q_{\rm PAH}$ is a steeply decreasing function of $Σ_{\rm SFR}$, likely reflecting PAH destruction in H II regions. Galaxy integrated $q_{\rm PAH}$ is strongly, negatively correlated with specific star formation rate (sSFR) and offset from the star-forming ``main sequence'' ($Δ$MS), suggesting that both metallicity and star formation intensity play a role in setting the global $q_{\rm PAH}$. We also find a nearly constant M$_{\rm d}$/M$_\star$ ratio for galaxies on the main sequence, with a lower ratio for more quiescent galaxies, likely due to their lower gas fractions. From these results, we construct prescriptions to estimate the radiation field distribution in both integrated and resolved galaxies. We test these prescriptions by comparing our predicted $\overline{U}$ to results of SED fitting for stacked "main sequence" galaxies at $0<z<4$ from Béthermin et al. (2015) and find sSFR is an accurate predictor of $\overline{U}$ even at these high redshifts. Finally, we describe the public delivery of matched-resolution WISE and Herschel maps along with the resolved dust SED fitting results through the InfraRed Science Archive (IRSA). |
| title | The Resolved Behavior of Dust Mass, Polycyclic Aromatic Hydrocarbon Fraction, and Radiation Field in ~ 800 Nearby Galaxies |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2410.03835 |