The Fraction of Dust Mass in the Form of Polycyclic Aromatic Hydrocarbons on 10-50 pc Scales in Nearby Galaxies

被引：11

作者：

Sutter, Jessica ^{[1
,2
]}

Sandstrom, Karin ^{[2
]}

Chastenet, Jeremy ^{[3
]}

Leroy, Adam K. ^{[4
,5
]}

Koch, Eric W. ^{[6
]}

Williams, Thomas G. ^{[7
]}

Chown, Ryan ^{[4
]}

Belfiore, Francesco ^{[8
]}

Bigiel, Frank ^{[9
]}

Boquien, Mederic ^{[10
]}

Cao, Yixian ^{[11
]}

Chevance, Melanie ^{[12
,13
]}

Dale, Daniel A. ^{[14
]}

Egorov, Oleg V. ^{[15
]}

Glover, Simon C. O. ^{[12
]}

Groves, Brent ^{[16
]}

Klessen, Ralf S. ^{[12
,17
]}

Kreckel, Kathryn ^{[15
]}

Larson, Kirsten L. ^{[18
]}

Oakes, Elias K. ^{[19
]}

Pathak, Debosmita ^{[4
]}

Ramambason, Lise ^{[12
]}

Rosolowsky, Erik ^{[20
]}

Watkins, Elizabeth J. ^{[21
]}

机构：

[1] Whitman Coll, 345 Boyer Ave, Walla Walla, WA 99362 USA

[2] Univ Calif San Diego, Dept Astron & Astrophys, 9500 Gilman Dr, La Jolla, CA 92093 USA

[3] Univ Ghent, Sterrenkundig Observ, Krijgslaan 281 S9, B-9000 Ghent, Belgium

[4] Ohio State Univ, Dept Astron, 140 West 18th Ave, Columbus, OH 43210 USA

[5] Ctr Cosmol & Astroparticle Phys CCAPP, 191 West Woodruff Ave, Columbus, OH 43210 USA

[6] Ctr Astrophys Harvard & Smithsonian, 60 Garden St, Cambridge, MA 02138 USA

[7] Univ Oxford, Sub Dept Astrophys, Dept Phys, Keble Rd, Oxford OX1 3RH, England

[8] INAF Osservatorio Astrofisico Arcetri, Largo E Fermi 5, I-50125 Florence, Italy

[9] Univ Bonn, Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany

[10] Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, F-06000 Nice, France

[11] Max Planck Inst Extraterr Phys MPE, Giessenbachstr 1, D-85748 Garching, Germany

[12] Heidelberg Univ, Inst Theoret Astrophys, Zentrum Astron, Albert Ueberle Str 2, D-69120 Heidelberg, Germany

[13] Cosm Origins Life COOL Res DAO, Munich, Germany

[14] Univ Wyoming, Dept Phys & Astron, Laramie, WY 82071 USA

[15] Heidelberg Univ, Astron Rechen Inst, Zentrum Astron, Monchhofstr 12-14, D-69120 Heidelberg, Germany

[16] Univ Western Australia, Int Ctr Radio Astron Res, 7 Fairway, Crawley, WA 6009, Australia

[17] Heidelberg Univ, Interdisziplinares Zentrum Wissenschaftl Rechnen, Neuenheimer Feld 205, D-69120 Heidelberg, Germany

[18] Space Telescope Sci Inst, AURA European Space Agcy ESA, 3700 San Martin Dr, Baltimore, MD 21218 USA

[19] Univ Connecticut, Dept Phys, 196A Auditorium Rd, Storrs, CT 06269 USA

[20] Univ Alberta, Dept Phys, 4-183 CCIS, Edmonton, AB T6G 2E1, Canada

[21] Univ Manchester, Ctr Astrophys, Dept Phys & Astron, Jodrell Bank, Oxford Rd, Manchester M13 9PL, England

来源：

ASTROPHYSICAL JOURNAL | 2024年 / 971卷 / 02期

关键词：

SPECTRAL ENERGY-DISTRIBUTIONS; STAR-FORMATION RATE; INFRARED-EMISSION; INTERSTELLAR DUST; MOLECULAR GAS; PAH EMISSION; MIDINFRARED EMISSION; MODELING DUST; HII-REGIONS; JWST;

D O I：

10.3847/1538-4357/ad54bd

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Polycyclic aromatic hydrocarbons (PAHs) are a ubiquitous component of the interstellar medium (ISM) in z similar to 0 massive, star-forming galaxies and play key roles in ISM energy balance, chemistry, and shielding. Wide field-of-view, high-resolution mid-infrared (MIR) images from JWST provide the ability to map the fraction of dust in the form of PAHs and the properties of these key dust grains at 10-50 pc resolution in galaxies outside the Local Group. We use MIR JWST photometric observations of a sample of 19 nearby galaxies from the Physics at High Angular Resolution in Nearby GalaxieS (PHANGS) survey to investigate the variations of the PAH fraction. By comparison to lower-resolution far-infrared mapping, we show that a combination of the MIRI filters (R PAH = [F770W+F1130W]/F2100W) traces the fraction of dust by mass in the form of PAHs (i.e., the PAH fraction, or q PAH). Mapping R PAH across the 19 PHANGS galaxies, we find that the PAH fraction steeply decreases in H ii regions, revealing the destruction of these small grains in regions of ionized gas. Outside H ii regions, we find R PAH is constant across the PHANGS sample with an average value of 3.43 +/- 0.98, which, for an illuminating radiation field of intensity 2-5 times that of the radiation field in the solar neighborhood, corresponds to q PAH values of 3%-6%.

引用

页数：31

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