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The rarity of dust in metal-poor galaxies

Abstract

Galaxies observed at redshift z > 6, when the Universe was less than a billion years old, thus far very rarely show evidence1,2,3 of the cold dust that accompanies star formation in the local Universe, where the dust-to-gas mass ratio is around one per cent. A prototypical example is the galaxy Himiko (z = 6.6), which—a mere 840 million years after the Big Bang—is forming stars at a rate of 30–100 solar masses per year, yielding a mass assembly time of about 150 × 106 years. Himiko is thought to have a low fraction (2–3 per cent of the Sun’s) of elements heavier than helium (low metallicity), and although its gas mass cannot yet be determined its dust-to-stellar mass ratio is constrained3 to be less than 0.05 per cent. The local dwarf galaxy I Zwicky 18, which has a metallicity about 4 per cent that of the Sun’s4 and is forming stars less rapidly (assembly time about 1.6 × 109 years) than Himiko but still vigorously for its mass5, is also very dust deficient and is perhaps one of the best analogues of primitive galaxies accessible to detailed study. Here we report observations of dust emission from I Zw 18, from which we determine its dust mass to be 450–1,800 solar masses, yielding a dust-to-stellar mass ratio of about 10−6 to 10−5 and a dust-to-gas mass ratio of 3.2–13 × 10−6. If I Zw 18 is a reasonable analogue of Himiko, then Himiko’s dust mass must be around 50,000 solar masses, a factor of 100 below the current upper limit. These numbers are quite uncertain, but if most high-z galaxies are more like Himiko than like the very-high-dust-mass galaxy SDSS J114816.64 + 525150.3 at z ≈ 6, which hosts a quasar6, then our prospects for detecting the gas and dust inside such galaxies are much poorer than hitherto anticipated.

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Figure 1: The 100-µm and 160-µm images of I Zw 18.
Figure 2: The far infrared spectral energy distribution of I Zw 18.
Figure 3: The dust-to-gas ratio of galaxies compared to metallicity for local galaxies and I Zw 18.
Figure 4: Dust mass versus star-formation rate and stellar mass for local disks, high-z starbursts and I Zw 18.

References

  1. 1

    Walter, F. et al. Evidence for low extinction in actively star-forming galaxies at z > 6.5. Astrophys. J. 752, 93–98 (2012)

    ADS  Article  Google Scholar 

  2. 2

    Kanekar, N., Wagg, J., Ram, C. R. & Carilli, C. L. A search for C II 158 µm line emission in HCM 6A, a Lyα emitter at z = 6.56. Astrophys. J. 771, L20–L25 (2013)

    ADS  Article  Google Scholar 

  3. 3

    Ouchi, M. et al. An intensely star-forming galaxy at z7 with low dust and metal content revealed by deep ALMA and HST observations. Preprint at http://arxiv.org/abs/1306.3572 (2013)

  4. 4

    Skillman, E. D. & Kennicutt, R. C., Jr Spatially resolved optical and near-infrared spectroscopy of I ZW 18. Astrophys. J. 411, 655–666 (1993)

    ADS  CAS  Article  Google Scholar 

  5. 5

    Cannon, J. M., Skillman, E. D., Garnett, D. R. & Dufour, R. J. Dust in I Zw 18 from Hubble Space Telescope narrowband Imaging. Astrophys. J. 565, 931–940 (2002)

    ADS  CAS  Article  Google Scholar 

  6. 6

    Walter, F. et al. Molecular gas in the host galaxy of a quasar at redshift z = 6.42. Nature 424, 406–408 (2003)

    ADS  CAS  Article  Google Scholar 

  7. 7

    Riechers, D. A. et al. A dust-obscured massive maximum-starburst galaxy at a redshift of 6.34. Nature 496, 329–333 (2013)

    ADS  CAS  Article  Google Scholar 

  8. 8

    Vieira, J. D. et al. Dusty starburst galaxies in the early Universe as revealed by gravitational lensing. Nature 495, 344–347 (2013)

    ADS  CAS  Article  Google Scholar 

  9. 9

    Bouwens, R. J. et al. UV-continuum slopes of >4000 z4–8 galaxies from the HUDF/XDF, HUDF09, ERS, CANDELS-South, and CANDELS-North fields. Preprint at http://arxiv.org/abs/1306.2950 (2013)

  10. 10

    Aloisi, A. et al. I Zw 18 revisited with HST ACS and cepheids: new distance and age. Astrophys. J. 667, L151–L154 (2007)

    ADS  CAS  Article  Google Scholar 

  11. 11

    van Zee, L., Westpfahl, D., Haynes, M. P. & Salzer, J. J. The complex kinematics of the neutral hydrogen associated with I ZW 18. Astron. J. 115, 1000–1015 (1998)

    ADS  CAS  Article  Google Scholar 

  12. 12

    Herrera-Camus, R. et al. Dust-to-gas ratio in the extremely metal-poor galaxy I Zw 18. Astrophys. J. 752, 112–119 (2012)

    ADS  Article  Google Scholar 

  13. 13

    Lelli, F., Verheijen, M., Fraternali, F. & Sancisi, R. Dynamics of starbursting dwarf galaxies: I Zw 18. Astron. Astrophys. 537, A72 (2012)

    ADS  Article  Google Scholar 

  14. 14

    Wu, Y. et al. Dust in the extremely metal-poor blue compact dwarf galaxy I Zw 18: the Spitzer mid-infrared view. Astrophys. J. 662, 952–958 (2007)

    ADS  CAS  Article  Google Scholar 

  15. 15

    Elmegreen, B. G. et al. Carbon monoxide in clouds at low metallicity in the dwarf irregular galaxy WLM. Nature 495, 487–489 (2013)

    ADS  CAS  Article  Google Scholar 

  16. 16

    Remy-Ruyer, A. et al. Revealing the cold dust in low-metallicity environments. I. Photometry analysis of the Dwarf Galaxy Survey with Herschel. Astron. Astrophys. 557, A95 (2013)

    Article  Google Scholar 

  17. 17

    Engelbracht, C. W. et al. Metallicity effects on dust properties in starbursting galaxies. Astrophys. J. 678, 804–827 (2008)

    ADS  CAS  Article  Google Scholar 

  18. 18

    Gnedin, N. Y. & Kravtsov, A. V. Environmental dependence of the Kennicutt-Schmidt relation in galaxies. Astrophys. J. 728, 88–108 (2011)

    ADS  Article  Google Scholar 

  19. 19

    Draine, B. T. & Li, A. Infrared emission from interstellar dust. IV. The silicate-graphite-PAH model in the post-Spitzer era. Astrophys. J. 657, 810–837 (2007)

    ADS  CAS  Article  Google Scholar 

  20. 20

    Galametz, M. et al. Probing the dust properties of galaxies up to submillimetre wavelengths. II. Dust-to-gas mass ratio trends with metallicity and the submm excess in dwarf galaxies. Astron. Astrophys. 532, 56–74 (2011)

    Article  Google Scholar 

  21. 21

    Draine, B. T. et al. Dust masses, PAH abundances, and starlight intensities in the Sings galaxy sample. Astrophys. J. 663, 866–894 (2007)

    ADS  CAS  Article  Google Scholar 

  22. 22

    Leroy, A. et al. The Spitzer Survey of the Small Magellanic Cloud: far-infrared emission and cold gas in the Small Magellanic Cloud. Astrophys. J. 658, 1027–1046 (2007)

    ADS  CAS  Article  Google Scholar 

  23. 23

    Kennicutt, R. C., Jr et al. Dust-corrected star formation rates of galaxies. I. Combinations of Hα and infrared tracers. Astrophys. J. 703, 1672–1695 (2009)

    ADS  CAS  Article  Google Scholar 

  24. 24

    Skibba, R. et al. The emission by dust and stars of nearby galaxies in the Herschel KINGFISH Survey. Astrophys. J. 738, 89–107 (2011)

    ADS  Article  Google Scholar 

  25. 25

    Fisher, D. B. et al. The molecular gas density in galaxy centers and how it connects to bulges. Astrophys. J. 764, 174–198 (2013)

    ADS  Article  Google Scholar 

  26. 26

    Magnelli, B. et al. A Herschel view of the far-infrared properties of submillimetre galaxies. Astron. Astrophys. 539, 155–190 (2012)

    Article  Google Scholar 

Download references

Acknowledgements

D.B.F., A.D.B. and R.H.-C. acknowledge support from the University of Maryland and the Laboratory for Millimeter Astronomy and NSF grant number AST0838178. A.D.B. acknowledges partial support from CAREER NSF grant numbers AST0955836 and AST1139998 and from a Research Corporation for Science Advancement Cottrell Scholar award. B.T.D. acknowledges partial support from NSF grant number AST1008570. J.M.C. is supported by NSF grant number AST1211683. K.M.S. acknowledges support from a Marie Curie International Incoming fellowship. PACS has been developed by a consortium of institutes led by MPE (Germany) and including UVIE (Austria); KU Leuven, CSL, IMEC (Belgium); CEA, LAM (France); MPIA (Germany); INAF-IFSI/OAA/OAP/OAT, LENS, SISSA (Italy) and IAC (Spain). This development has been supported by the funding agencies BMVIT (Austria), ESA-PRODEX (Belgium), CEA/CNES (France), DLR (Germany), ASI/INAF (Italy) and CICYT/MCYT (Spain).

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D.B.F. and A.D.B. wrote the text of both the proposal and this manuscript. D.B.F. and R.H.-C. performed detailed calculations. J.D. reduced the Herschel data. B.T.D. modelled the spectral energy distribution. A.K.L. and F.W. obtained and reduced the CO observations. J.C. obtained the Hα flux for I Zw 18. All authors participated in discussion of results and helped with revision of the manuscript.

Corresponding authors

Correspondence to David B. Fisher or Alberto D. Bolatto.

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The authors declare no competing financial interests.

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Fisher, D., Bolatto, A., Herrera-Camus, R. et al. The rarity of dust in metal-poor galaxies. Nature 505, 186–189 (2014). https://doi.org/10.1038/nature12765

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