Evidence of dust grain evolution from extinction mapping in the IC 63 photodissociation region
- Author
- Dries Van De Putte, Karl Gordon (UGent) , Julia Roman-Duval, Benjamin F Williams, Maarten Baes (UGent) , Kirill Tchernyshyov, Brandon L Lawton and Heddy Arab
- Organization
- Abstract
- Photodissociation regions (PDRs) are parts of the ISM consisting of predominantly neutral gas, located at the interface between H II regions and molecular clouds. The physical conditions within these regions show variations on very short spatial scales, and therefore PDRs constitute ideal laboratories for investigating the properties and evolution of dust grains. We have mapped IC 63 at high resolution from the UV to the NIR (275 nm to 1.6 μm), using the Hubble Space Telescope WFC3. Using a Bayesian SED fitting tool, we simultaneously derive a set of stellar (Teff, log(g), distance) and extinction (AV, RV) parameters for 520 background stars. We present maps of AV and RV with a resolution of 25 arcsec based on these results. The extinction properties vary across the PDR, with values for AV between 0.5 and 1.4 mag, and a decreasing trend in RV, going from 3.7 at the front of the nebula to values as low as 2.5 further in. This provides evidence for evolution of the dust optical properties. We fit two modified blackbodies to the MIR and FIR SED, obtained by combining the AV map with data from Spitzer and Herschel. We derive effective temperatures (30 and 227 K) and the ratio of opacities at 160 μm to V band κ160/κV (7.0 × 10−4 and 2.9 × 10−9) for the two dust populations. Similar fits to individual pixels show spatial variations of κ160/κV. The analysis of our HST data, combined with these Spitzer and Herschel data, provides the first panchromatic view of dust within a PDR.
- Keywords
- BLANKETED MODEL ATMOSPHERES, SMALL-MAGELLANIC-CLOUD, X-RAY-ABSORPTION, INTERSTELLAR H-I, CHEMICAL-STRUCTURE, OPTICAL EXTINCTION, INFRARED-EMISSION, ALPHA ABSORPTION, IC-63 NEBULA, ULTRAVIOLET
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Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-8641615
- MLA
- Van De Putte, Dries, et al. “Evidence of Dust Grain Evolution from Extinction Mapping in the IC 63 Photodissociation Region.” ASTROPHYSICAL JOURNAL, vol. 888, no. 1, 2020, doi:10.3847/1538-4357/ab557f.
- APA
- Van De Putte, D., Gordon, K., Roman-Duval, J., Williams, B. F., Baes, M., Tchernyshyov, K., … Arab, H. (2020). Evidence of dust grain evolution from extinction mapping in the IC 63 photodissociation region. ASTROPHYSICAL JOURNAL, 888(1). https://doi.org/10.3847/1538-4357/ab557f
- Chicago author-date
- Van De Putte, Dries, Karl Gordon, Julia Roman-Duval, Benjamin F Williams, Maarten Baes, Kirill Tchernyshyov, Brandon L Lawton, and Heddy Arab. 2020. “Evidence of Dust Grain Evolution from Extinction Mapping in the IC 63 Photodissociation Region.” ASTROPHYSICAL JOURNAL 888 (1). https://doi.org/10.3847/1538-4357/ab557f.
- Chicago author-date (all authors)
- Van De Putte, Dries, Karl Gordon, Julia Roman-Duval, Benjamin F Williams, Maarten Baes, Kirill Tchernyshyov, Brandon L Lawton, and Heddy Arab. 2020. “Evidence of Dust Grain Evolution from Extinction Mapping in the IC 63 Photodissociation Region.” ASTROPHYSICAL JOURNAL 888 (1). doi:10.3847/1538-4357/ab557f.
- Vancouver
- 1.Van De Putte D, Gordon K, Roman-Duval J, Williams BF, Baes M, Tchernyshyov K, et al. Evidence of dust grain evolution from extinction mapping in the IC 63 photodissociation region. ASTROPHYSICAL JOURNAL. 2020;888(1).
- IEEE
- [1]D. Van De Putte et al., “Evidence of dust grain evolution from extinction mapping in the IC 63 photodissociation region,” ASTROPHYSICAL JOURNAL, vol. 888, no. 1, 2020.
@article{8641615,
abstract = {{Photodissociation regions (PDRs) are parts of the ISM consisting of predominantly neutral gas, located at the interface between H II regions and molecular clouds. The physical conditions within these regions show variations on very short spatial scales, and therefore PDRs constitute ideal laboratories for investigating the properties and evolution of dust grains. We have mapped IC 63 at high resolution from the UV to the NIR (275 nm to 1.6 μm), using the Hubble Space Telescope WFC3. Using a Bayesian SED fitting tool, we simultaneously derive a set of stellar (Teff, log(g), distance) and extinction (AV, RV) parameters for 520 background stars. We present maps of AV and RV with a resolution of 25 arcsec based on these results. The extinction properties vary across the PDR, with values for AV between 0.5 and 1.4 mag, and a decreasing trend in RV, going from 3.7 at the front of the nebula to values as low as 2.5 further in. This provides evidence for evolution of the dust optical properties. We fit two modified blackbodies to the MIR and FIR SED, obtained by combining the AV map with data from Spitzer and Herschel. We derive effective temperatures (30 and 227 K) and the ratio of opacities at 160 μm to V band κ160/κV (7.0 × 10−4 and 2.9 × 10−9) for the two dust populations. Similar fits to individual pixels show spatial variations of κ160/κV. The analysis of our HST data, combined with these Spitzer and Herschel data, provides the first panchromatic view of dust within a PDR.}},
articleno = {{22}},
author = {{Van De Putte, Dries and Gordon, Karl and Roman-Duval, Julia and Williams, Benjamin F and Baes, Maarten and Tchernyshyov, Kirill and Lawton, Brandon L and Arab, Heddy}},
issn = {{1538-4357}},
journal = {{ASTROPHYSICAL JOURNAL}},
keywords = {{BLANKETED MODEL ATMOSPHERES,SMALL-MAGELLANIC-CLOUD,X-RAY-ABSORPTION,INTERSTELLAR H-I,CHEMICAL-STRUCTURE,OPTICAL EXTINCTION,INFRARED-EMISSION,ALPHA ABSORPTION,IC-63 NEBULA,ULTRAVIOLET}},
language = {{eng}},
number = {{1}},
pages = {{23}},
title = {{Evidence of dust grain evolution from extinction mapping in the IC 63 photodissociation region}},
url = {{http://doi.org/10.3847/1538-4357/ab557f}},
volume = {{888}},
year = {{2020}},
}
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