1. On the Impact of Inclination-dependent Attenuation on Derived Star Formation Histories: Results from Disk Galaxies in the Gre
- Author
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Doore, Keith, Eufrasio, Rafael T., Lehmer, Bret D., Monson, Erik B., Basu-Zych, Antara, Garofali, Kristen, and Ptak, Andrew
- Abstract
energy distribution (SED) fitting and study its impact on derived star formation histories. We apply our prescription within the SED fitting code Lightning to a clean sample of 82, z = 0.21���1.35 disk-dominated galaxies in the Great Observatories Origins Deep Survey North and South fields. To compare our inclination-dependent attenuation prescription with more traditional fitting prescriptions, we also fit the SEDs with the inclination-independent Calzetti et al. (2000) attenuation curve. From this comparison, we find that fits to a subset of 58, z < 0.7 galaxies in our sample, utilizing the Calzetti et al. (2000) prescription, recover similar trends with inclination as the inclination-dependent fits for the far-UV-band attenuation and recent star formation rates. However, we find a difference between prescriptions in the optical attenuation (AV) that is strongly correlated with inclination (p���value < 10���11). For more face-on galaxies, with i ��� 50��, (edge-on, i ��� 90��), the average derived AV is 0.31 �� 0.11 magnitudes lower (0.56 �� 0.16 magnitudes higher) for the inclination-dependent model compared to traditional methods. Further, the ratio of stellar masses between prescriptions also has a significant (p���value < 10���2) trend with inclination. For i = 0�����65��, stellar masses are systematically consistent between fits, with ${\mathrm{log}}_{10}({M}_{\star }^{\mathrm{inc}}/{M}_{\star }^{\mathrm{Calzetti}})=-0.05\pm 0.03$ dex and scatter of 0.11 dex. However, for i ��� 80�����90��, the derived stellar masses are lower for the Calzetti et al. (2000) fits by an average factor of 0.17 �� 0.03 dex and scatter of 0.13 dex. Therefore, these results suggest that SED fitting assuming the Calzetti et al. (2000) attenuation law potentially underestimates stellar masses in highly inclined disk-dominated galaxies.
- Published
- 2021
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