Extinction Maps and Dust-to-gas Ratios in Nearby Galaxies with LEGUS

被引：25

作者：

Kahre, L. ^{[1
]}

Walterbos, R. A. ^{[1
]}

Kim, H. ^{[2
]}

Thilker, D. ^{[3
]}

Calzetti, D. ^{[4
]}

Lee, J. C. ^{[5
]}

Sabbi, E. ^{[5
]}

Ubeda, L. ^{[5
]}

Aloisi, A. ^{[5
]}

Cignoni, M. ^{[6
,7
,8
]}

Cook, D. O. ^{[9
,10
]}

Dale, D. A. ^{[10
]}

Elmegreen, B. G. ^{[11
]}

Elmegreen, D. M. ^{[12
]}

Fumagalli, M. ^{[13
,14
]}

Gallagher, J. S., III ^{[15
]}

Gouliermis, D. A. ^{[16
,17
]}

Grasha, K. ^{[18
]}

Grebel, E. K. ^{[19
]}

Hunter, D. A. ^{[20
]}

Sacchi, E. ^{[8
,21
]}

Smith, L. J. ^{[22
]}

Tosi, M. ^{[8
]}

Adamo, A. ^{[23
]}

Andrews, J. E. ^{[24
]}

Ashworth, G. ^{[13
,14
]}

Bright, S. N. ^{[5
]}

Brown, T. M. ^{[5
]}

Chandar, R. ^{[25
]}

Christian, C. ^{[5
]}

de Mink, S. E. ^{[26
]}

Dobbs, C. ^{[27
]}

Evans, A. S. ^{[28
,29
]}

Herrero, A. ^{[30
,31
]}

Johnson, K. E. ^{[28
]}

Kennicutt, R. C. ^{[24
,32
]}

Krumholz, M. R. ^{[33
]}

Messa, M. ^{[23
]}

Nair, P. ^{[34
]}

Nota, A. ^{[22
]}

Pellerin, A. ^{[35
]}

Ryon, J. E. ^{[5
]}

Schaerer, D. ^{[36
]}

Shabani, F. ^{[19
]}

Van Dyk, S. D. ^{[37
]}

Whitmore, B. C. ^{[5
]}

Wofford, A. ^{[38
]}

机构：

[1] New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA

[2] Gemini Observ, La Serena, Chile

[3] Johns Hopkins Univ, Baltimore, MD USA

[4] Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA

[5] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[6] Univ Pisa, Dept Phys, Largo B Pontecorvo 3, I-56127 Pisa, Italy

[7] Ist Nazl Fis Nucl, Largo B Pontecorvo 3, I-56127 Pisa, Italy

[8] INAF Osservatorio Astron Bologna, Bologna, Italy

[9] CALTECH, Pasadena, CA 91125 USA

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

[11] TJ Watson Res Ctr, IBM Res Div, Yorktown Hts, NY USA

[12] Vassar Coll, Dept Phys & Astron, Poughkeepsie, NY 12601 USA

[13] Univ Durham, Inst Computat Cosmol, Durham, England

[14] Univ Durham, Ctr Extragalact Astron, Dept Phys, Durham, England

[15] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA

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

[17] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[18] Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA

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

[20] Lowell Observ, 1400 W Mars Hill Rd, Flagstaff, AZ 86001 USA

[21] Bologna Univ, Dept Phys & Astron, Bologna, Italy

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

[23] Stockholm Univ, AlbaNova Univ Ctr, Oskar Klein Ctr, Dept Astron, SE-10691 Stockholm, Sweden

[24] Univ Arizona, Dept Astron, Tucson, AZ USA

[25] Univ Toledo, Dept Phys & Astron, Toledo, OH 43606 USA

[26] Univ Amsterdam, Astron Inst Anton Pannekoek, Amsterdam, Netherlands

[27] Univ Exeter, Sch Phys & Astron, Exeter, Devon, England

[28] Univ Virginia, Dept Astron, Charlottesville, VA 22903 USA

[29] Natl Radio Astron Observ, Charlottesville, VA USA

[30] Inst Astrofis Canarias, Tenerife, Spain

[31] Univ La Laguna, Dept Astrofis, Tenerife, Spain

[32] Univ Cambridge, Inst Astron, Cambridge, England

[33] Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT, Australia

[34] Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA

[35] SUNY Coll Geneseo, Dept Phys & Astron, Geneseo, NY 14454 USA

[36] Univ Geneva, Observ Geneve, Geneva, Switzerland

[37] CALTECH, PAC, Pasadena, CA 91125 USA

[38] Univ Nacl Autonoma Mexico, Inst Astron, Unidad Acad Ensenada, Km 103 Carr Tijuana Ensenada, Ensenada 22860, Baja California, Mexico

来源：

ASTROPHYSICAL JOURNAL | 2018年 / 855卷 / 02期

基金：

英国科学技术设施理事会;

关键词：

dust; extinction; galaxies: dwarf; galaxies: ISM; galaxies: photometry; galaxies: spiral; ISM: general; SMALL-MAGELLANIC-CLOUD; INTERSTELLAR DUST; STAR-CLUSTERS; NGC; 6503; H-ALPHA; STELLAR; ULTRAVIOLET; ABUNDANCES; PHOTOMETRY; EMISSION;

D O I：

10.3847/1538-4357/aab101

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a study of the dust-to-gas ratios in five nearby galaxies: NGC 628 (M74), NGC 6503, NGC 7793, UGC 5139 (Holmberg I), and UGC 4305 (Holmberg II). Using Hubble Space Telescope broadband WFC3/UVIS UV and optical images from the Treasury program Legacy ExtraGalactic UV Survey (LEGUS) combined with archival HST/Advanced Camera for Surveys data, we correct thousands of individual stars for extinction across these five galaxies using an isochrone-matching (reddening-free Q) method. We generate extinction maps for each galaxy from the individual stellar extinctions using both adaptive and fixed resolution techniques and correlate these maps with neutral H I and CO gas maps from the literature, including the H I Nearby Galaxy Survey and the HERA CO-Line Extragalactic Survey. We calculate dust-to-gas ratios and investigate variations in the dust-to-gas ratio with galaxy metallicity. We find a power-law relationship between dust-to-gas ratio and metallicity, consistent with other studies of dust-to-gas ratio compared to metallicity. We find a change in the relation when H-2 is not included. This implies that underestimation of N-H2 in low-metallicity dwarfs from a too-low CO-to-H-2 conversion factor X-CO could have produced too low a slope in the derived relationship between dust-to-gas ratio and metallicity. We also compare our extinctions to those derived from fitting the spectral energy distribution (SED) using the Bayesian Extinction and Stellar Tool for NGC 7793 and find systematically lower extinctions from SED fitting as compared to isochrone matching.

引用

页数：16

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