Spatially Resolved Dust, Gas, and Star Formation in the Dwarf Magellanic Irregular NGC 4449

被引：16

作者：

Calzetti, D. ^{[1
]}

Wilson, G. W. ^{[1
]}

Draine, B. T. ^{[2
]}

Roussel, H. ^{[3
]}

Johnson, K. E. ^{[4
]}

Heyer, M. H. ^{[1
]}

Wall, W. F. ^{[5
]}

Grasha, K. ^{[1
]}

Battisti, A. ^{[1
]}

Andrews, J. E. ^{[6
]}

Kirkpatrick, A. ^{[7
]}

Rosa Gonzalez, D. ^{[5
]}

Vega, O. ^{[5
]}

Puschnig, J. ^{[8
]}

Yun, M. ^{[1
]}

Ostlin, G. ^{[8
]}

Evans, A. S. ^{[4
,9
]}

Tang, Y. ^{[1
]}

Lowenthal, J. ^{[10
]}

Sanchez-Arguelles, D. ^{[5
]}

机构：

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

[2] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[3] Inst Astrophys Paris, F-75014 Paris, France

[4] Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA

[5] INAOE, Puebla 72840, Mexico

[6] Univ Arizona, Dept Astron, Tucson, AZ 85719 USA

[7] Yale Univ, Dept Astron, New Haven, CT 06511 USA

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

[9] Natl Radio Astron Observ, Charlottesville, VA 22903 USA

[10] Smith Coll, Dept Astron, Northampton, MA 01063 USA

来源：

ASTROPHYSICAL JOURNAL | 2018年 / 852卷 / 02期

基金：

美国国家航空航天局;

关键词：

dust; extinction; galaxies: dwarf; galaxies: general; galaxies: individual (NGC 4449); galaxies: ISM; galaxies: star formation; KENNICUTT-SCHMIDT RELATIONSHIP; FORMATION RATE INDICATORS; NEARBY MOLECULAR CLOUDS; INITIAL MASS FUNCTION; FORMATION RATES; LOCAL VOLUME; FORMATION LAW; H I; PHYSICAL-PROPERTIES; INTERSTELLAR-MEDIUM;

D O I：

10.3847/1538-4357/aaa1e2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the relation between gas and star formation in subgalactic regions, similar to 360. pc to similar to 1.5. kpc in size, within the nearby starburst dwarf NGC 4449, in order to separate the underlying relation from the effects of sampling at varying spatial scales. Dust and gas mass surface densities are derived by combining new observations at 1.1. mm, obtained with the AzTEC instrument on the Large Millimeter Telescope, with archival infrared images in the range 8-500 mu m from the Spitzer Space Telescope and the Herschel Space Observatory. We extend the dynamic range of our millimeter (and dust) maps at the faint end, using a correlation between the far-infrared/millimeter colors F(70)/F(1100) (and F(160)/F(1100)) and the mid-infrared color F(8)/F(24) that we establish for the first time for this and other galaxies. Supplementing our data with maps of the extinction-corrected star formation rate (SFR) surface density, we measure both the SFR-molecular gas and the SFR-total. gas relations in NGC 4449. We find that the SFR-molecular. gas relation is described by a power law with an exponent that decreases from similar to 1.5 to similar to 1.2 for increasing region size, while the exponent of the SFR-total. gas relation remains constant with a value of similar to 1.5 independent of region size. We attribute the molecular law behavior to the increasingly better sampling of the molecular cloud mass function at larger region sizes; conversely, the total gas law behavior likely results from the balance between the atomic and molecular gas phases achieved in regions of active star formation. Our results indicate a nonlinear relation between SFR and gas surface density in NGC 4449, similar to what is observed for galaxy samples.

引用

页数：25

共 116 条

[41] THE STAR FORMATION RATE AND GAS SURFACE DENSITY RELATION IN THE MILKY WAY: IMPLICATIONS FOR EXTRAGALACTIC STUDIES [J].

Heiderman, Amanda ;

Evans, Neal J., II ;

Allen, Lori E. ;

Huard, Tracy ;

Heyer, Mark .

ASTROPHYSICAL JOURNAL, 2010, 723 (02) :1019-1037

[42] The anatomy of star formation in NGC 300 [J].

Helou, G ;

Roussel, H ;

Appleton, P ;

Frayer, D ;

Stolovy, S ;

Storrie-Lombardi, L ;

Hurt, R ;

Lowrance, P ;

Makovoz, D ;

Masci, F ;

Surace, J ;

Gordon, KD ;

Alonso-Herrero, A ;

Engelbracht, CW ;

Misselt, K ;

Rieke, G ;

Rieke, M ;

Willner, SP ;

Pahre, M ;

Ashby, MLN ;

Fazio, GG ;

Smith, HA .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2004, 154 (01) :253-258

[43] THE ATACAMA COSMOLOGY TELESCOPE (ACT): BEAM PROFILES AND FIRST SZ CLUSTER MAPS [J].

Hincks, A. D. ;

Acquaviva, V. ;

Ade, P. A. R. ;

Aguirre, P. ;

Amiri, M. ;

Appel, J. W. ;

Barrientos, L. F. ;

Battistelli, E. S. ;

Bond, J. R. ;

Brown, B. ;

Burger, B. ;

Chervenak, J. ;

Das, S. ;

Devlin, M. J. ;

Dicker, S. R. ;

Doriese, W. B. ;

Dunkley, J. ;

Duenner, R. ;

Essinger-Hileman, T. ;

Fisher, R. P. ;

Fowler, J. W. ;

Hajian, A. ;

Halpern, M. ;

Hasselfield, M. ;

Hernandez-Monteagudo, C. ;

Hilton, G. C. ;

Hilton, M. ;

Hlozek, R. ;

Huffenberger, K. M. ;

Hughes, D. H. ;

Hughes, J. P. ;

Infante, L. ;

Irwin, K. D. ;

Jimenez, R. ;

Juin, J. B. ;

Kaul, M. ;

Klein, J. ;

Kosowsky, A. ;

Lau, J. M. ;

Limon, M. ;

Lin, Y. -T. ;

Lupton, R. H. ;

Marriage, T. A. ;

Marsden, D. ;

Martocci, K. ;

Mauskopf, P. ;

Menanteau, F. ;

Moodley, K. ;

Moseley, H. ;

Netterfield, C. B. .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2010, 191 (02) :423-438

[44] Star formation rates from young-star counts and the structure of the ISM across the NGC 346/N66 complex in the SMC [J].

Hony, S. ;

Gouliermis, D. A. ;

Galliano, F. ;

Galametz, M. ;

Cormier, D. ;

Chen, C. -H. R. ;

Dib, S. ;

Hughes, A. ;

Klessen, R. S. ;

Roman-Duval, J. ;

Smith, L. ;

Bernard, J. -P. ;

Bot, C. ;

Carlson, L. ;

Gordon, K. ;

Indebetouw, R. ;

Lebouteiller, V. ;

Lee, M. -Y. ;

Madden, S. C. ;

Meixner, M. ;

Oliveira, J. ;

Rubio, M. ;

Sauvage, M. ;

Wu, R. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2015, 448 (02) :1847-1862

[45] Galaxies on FIRE (Feedback In Realistic Environments): stellar feedback explains cosmologically inefficient star formation [J].

Hopkins, Philip F. ;

Keres, Dusan ;

Onorbe, Jose ;

Faucher-Giguere, Claude-Andre ;

Quataert, Eliot ;

Murray, Norman ;

Bullock, James S. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2014, 445 (01) :581-603

[46]

Huchtmeier W. K., 1989, A General Catalog of HI Observations of Galaxies. The Reference Catalog

[47] Physical properties of giant molecular clouds in the Large Magellanic Cloud [J].

Hughes, A. ;

Wong, T. ;

Ott, J. ;

Muller, E. ;

Pineda, J. L. ;

Mizuno, Y. ;

Bernard, J. -P. ;

Paradis, D. ;

Maddison, S. ;

Reach, W. T. ;

Staveley-Smith, L. ;

Kawamura, A. ;

Meixner, M. ;

Kim, S. ;

Onishi, T. ;

Mizuno, N. ;

Fukui, Y. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2010, 406 (03) :2065-2086

[48] IRAS OBSERVATIONS OF A LARGE SAMPLE OF NORMAL IRREGULAR GALAXIES [J].

HUNTER, DA ;

GALLAGHER, JS ;

RICE, WL ;

GILLETT, FC .

ASTROPHYSICAL JOURNAL, 1989, 336 (01) :152-172

[49] The stellar velocity dispersion in the inner 1.3 disk scale lengths of the irregular galaxy NGC 4449 [J].

Hunter, DA ;

Rubin, VC ;

Swaters, RA ;

Sparke, LS ;

Levine, SE .

ASTROPHYSICAL JOURNAL, 2005, 634 (01) :281-286

[50] The stellar and gas kinematics of several irregular galaxies [J].

Hunter, DA ;

Rubin, VC ;

Swaters, RA ;

Sparke, LS ;

Levine, SE .

ASTROPHYSICAL JOURNAL, 2002, 580 (01) :194-212

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