Studies of galaxy surveys in the context of the cold dark matter paradigm have shown that the mass of the dark matter halo and the total stellar mass are coupled through a function that varies smoothly with mass. Their average ratio Mhalo/Mstars has a minimum of about 30 for galaxies with stellar masses near that of the Milky Way (approximately 5 × 1010 solar masses) and increases both towards lower masses and towards higher masses1,2. The scatter in this relation is not well known; it is generally thought to be less than a factor of two for massive galaxies but much larger for dwarf galaxies3,4. Here we report the radial velocities of ten luminous globular-cluster-like objects in the ultra-diffuse galaxy5 NGC1052–DF2, which has a stellar mass of approximately 2 × 108 solar masses. We infer that its velocity dispersion is less than 10.5 kilometres per second with 90 per cent confidence, and we determine from this that its total mass within a radius of 7.6 kiloparsecs is less than 3.4 × 108 solar masses. This implies that the ratio Mhalo/Mstars is of order unity (and consistent with zero), a factor of at least 400 lower than expected2. NGC1052–DF2 demonstrates that dark matter is not always coupled with baryonic matter on galactic scales.
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Moster, B. P. et al. Constraints on the relationship between stellar mass and halo mass at low and high redshift. Astrophys. J. 710, 903–923 (2010)
Behroozi, P. S., Wechsler, R. H. & Conroy, C. The average star formation histories of galaxies in dark matter halos from z = 0–8. Astrophys. J. 770, 57 (2013)
More, S. et al. Satellite kinematics—III. Halo masses of central galaxies in SDSS. Mon. Not. R. Astron. Soc. 410, 210–226 (2011)
Oman, K. A. et al. Missing dark matter in dwarf galaxies? Mon. Not. R. Astron. Soc. 460, 3610–3623 (2016)
van Dokkum, P. G. et al. Forty-seven Milky Way-sized, extremely diffuse galaxies in the Coma cluster. Astrophys. J. 798, L45 (2015)
Abraham, R. G. & van Dokkum, P. G. Ultra-low surface brightness imaging with the Dragonfly telephoto array. Publ. Astron. Soc. Pac. 126, 55–69 (2014)
Karachentsev, I. D., Karachentseva, V. E., Suchkov, A. A. & Grebel, E. K. Dwarf galaxy candidates found on the SERC EJ sky survey. Astron. Astrophys. Suppl. Ser. 145, 415–423 (2000)
Danieli, S. et al. The Dragonfly Nearby Galaxies Survey. III. The luminosity function of the M101 group. Astrophys. J. 837, 136 (2017)
Tonry, J. L. et al. The SBF survey of galaxy distances. IV. SBF magnitudes, colors, and distances. Astrophys. J. 546, 681–693 (2001)
Blakeslee, J. P., Lucey, J. R., Barris, B. J., Hudson, M. J. & Tonry, J. L. A synthesis of data from fundamental plane and surface brightness fluctuation surveys. Mon. Not. R. Astron. Soc. 327, 1004–1020 (2001)
Peng, C. Y., Ho, L. C., Impey, C. D. & Rix, H.-W. Detailed structural decomposition of galaxy images. Astron. J. 124, 266–293 (2002)
van Dokkum, P. et al. Extensive globular cluster systems associated with ultra diffuse galaxies in the Coma cluster. Astrophys. J. 844, L11 (2017)
McLaughlin, D. E. & van der Marel, R. P. Resolved massive star clusters in the Milky Way and its satellites: brightness profiles and a catalog of fundamental parameters. Astrophys. J. Suppl. Ser. 161, 304–360 (2005)
Beasley, M. A. et al. An overmassive dark halo around an ultra-diffuse galaxy in the Virgo cluster. Astrophys. J. 819, L20 (2016)
McConnachie, A. W. The observed properties of dwarf galaxies in and around the Local Group. Astron. J. 144, 4 (2012)
Watkins, L. L., Evans, N. W. & An, J. H. The masses of the Milky Way and Andromeda galaxies. Mon. Not. R. Astron. Soc. 406, 264–278 (2010)
Wolf, J. et al. Accurate masses for dispersion-supported galaxies. Mon. Not. R. Astron. Soc. 406, 1220–1237 (2010)
Bournaud, F. et al. Missing mass in collisional debris from galaxies. Science 316, 1166 (2007)
Ploeckinger, S. et al. Tidal dwarf galaxies in cosmological simulations. Mon. Not. R. Astron. Soc. 474, 580–596 (2018)
Natarajan, P., Sigurdsson, S. & Silk, J. Quasar outflows and the formation of dwarf galaxies. Mon. Not. R. Astron. Soc. 298, 577–582 (1998)
Canning, R. E. A. et al. Filamentary star formation in NGC 1275. Mon. Not. R. Astron. Soc. 444, 336–349 (2014)
Mandelker, N., van Dokkum, P. G., Brodie, J. P. & Ceverino, D. Cold filamentary accretion and the formation of metal poor globular clusters. Preprint at https://arxiv.org/abs/1711.09108 (2017)
van Breugel, W., Filippenko, A. V., Heckman, T. & Miley, G. Minkowski’s object—a starburst triggered by a radio jet. Astrophys. J. 293, 83–93 (1985)
Clowe, D. et al. A direct empirical proof of the existence of dark matter. Astrophys. J. 648, L109–L113 (2006)
Milgrom, M. A modification of the Newtonian dynamics as a possible alternative to the hidden mass hypothesis. Astrophys. J. 270, 365–370 (1983)
Verlinde, E. P. Emergent gravity and the dark universe. SciPost Phys. 2, 016 (2017)
Kroupa, P. The dark matter crisis: falsification of the current standard model of cosmology. Publ. Astron. Soc. Aust. 29, 395–433 (2012)
Angus, G. W. Dwarf spheroidals in MOND. Mon. Not. R. Astron. Soc. 387, 1481–1488 (2008)
Navarro, J. F., Frenk, C. S. & White, S. D. M. A universal density profile from hierarchical clustering. Astrophys. J. 490, 493–508 (1997)
Rodríguez-Puebla, A., Primack, J. R., Avila-Reese, V. & Faber, S. M. Constraining the galaxy–halo connection over the last 13.3 Gyr: star formation histories, galaxy mergers and structural properties. Mon. Not. R. Astron. Soc. 470, 651–687 (2017)
Merritt, A., van Dokkum, P., Abraham, R. & Zhang, J. The Dragonfly Nearby Galaxies Survey. I. Substantial variation in the diffuse stellar halos around spiral galaxies. Astrophys. J. 830, 62 (2016)
Abolfathi, B. et al. The Fourteenth Data Release of the Sloan Digital Sky Survey: first spectroscopic data from the extended Baryon Oscillation Sky Survey and from the second phase of the Apache Point Observatory Galactic Evolution Experiment. Preprint available at http://arxiv.org/abs/1707.09322 (2017)
Napolitano, N. R. et al. The Planetary Nebula Spectrograph elliptical galaxy survey: the dark matter in NGC 4494. Mon. Not. R. Astron. Soc. 393, 329–353 (2009)
Hook, I. M. et al. The Gemini-North Multi-Object Spectrograph: Performance in imaging, long-slit, and multi-object spectroscopic modes. Publ. Astron. Soc. Pac. 116, 425–440 (2004)
Bertin, E. & Arnouts, S. SExtractor: Software for source extraction. Astron. Astrophys. Suppl. 117, 393–404 (1996)
Sersic, J. L. Atlas de galaxias australes (Observatorio Astronomico, Cordoba, 1968)
Faber, S. M . et al. in Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, Proc. SPIE Vol. 4841 (eds Iye, M . & Moorwood, A. F. M. ) 1657–1669 (SPIE, 2003)
Oke, J. B. et al. The Keck Low-Resolution Imaging Spectrometer. Publ. Astron. Soc. Pac. 107, 375 (1995)
van Dokkum, P. et al. A high stellar velocity dispersion and ~100 globular clusters for the ultra-diffuse galaxy Dragonfly 44. Astrophys. J. 828, L6 (2016)
Foreman-Mackey, D., Hogg, D. W., Lang, D. & Goodman, J. emcee: The MCMC hammer. Publ. Astron. Soc. Pac. 125, 306–312 (2013)
Conroy, C., Gunn, J. E. & White, M. The propagation of uncertainties in stellar population synthesis modeling. I. The relevance of uncertain aspects of stellar evolution and the initial mass function to the derived physical properties of galaxies. Astrophys. J. 699, 486–506 (2009)
van Dokkum, P. G., Kriek, M. & Franx, M. A high stellar velocity dispersion for a compact massive galaxy at redshift z = 2.186. Nature 460, 717–719 (2009)
Beers, T. C., Flynn, K. & Gebhardt, K. Measures of location and scale for velocities in clusters of galaxies—a robust approach. Astron. J. 100, 32–46 (1990)
Mould, J. R. et al. The Hubble Space Telescope Key Project on the extragalactic distance scale. XXVIII. Combining the constraints on the Hubble constant. Astrophys. J. 529, 786–794 (2000)
Rejkuba, M. Globular cluster luminosity function as distance indicator. Astrophys. Space Sci. 341, 195–206 (2012)
Mei, S. et al. The Advanced Camera for Surveys Virgo Cluster Survey. V. Surface brightness fluctuation calibration for giant and dwarf early-type galaxies. Astrophys. J. 625, 121–129 (2005)
Blakeslee, J. P. et al. Surface brightness fluctuations in the Hubble Space Telescope ACS/WFC F814W bandpass and an update on galaxy distances. Astrophys. J. 724, 657–668 (2010)
Bahcall, J. N. & Tremaine, S. Methods for determining the masses of spherical systems. I—Test particles around a point mass. Astrophys. J. 244, 805–819 (1981)
Danieli, S., van Dokkum, P. & Conroy, C. Hunting faint dwarf galaxies in the field using integrated light surveys. Preprint at http://arxiv.org/abs/1711.00860 (2017)
Gu, M. et al. Low metallicities and old ages for three ultra-diffuse galaxies in the Coma cluster. Preprint at http://arxiv.org/abs/1709.07003 (2017)
Kroupa, P. On the variation of the initial mass function. Mon. Not. R. Astron. Soc. 322, 231–246 (2001)
Struble, M. F. Optical discovery of intracluster matter on the Palomar Observatory Sky Survey—the star pile in A545. Astrophys. J. 330, L25–L28 (1988)
Salinas, R. et al. Crazy heart: kinematics of the “star pile” in Abell 545. Astron. Astrophys. 528, A61 (2011)
Merritt, A. et al. The Dragonfly Nearby Galaxies Survey. II. Ultra-diffuse galaxies near the elliptical galaxy NGC 5485. Astrophys. J. 833, 168 (2016)
Collins, M. L. M. et al. A kinematic study of the Andromeda dwarf spheroidal system. Astrophys. J. 768, 172 (2013)
Tollerud, E. J. et al. The SPLASH Survey: spectroscopy of 15 M31 dwarf spheroidal satellite galaxies. Astrophys. J. 752, 45 (2012)
Baumgardt, H., Parmentier, G., Gieles, M. & Vesperini, E. Evidence for two populations of Galactic globular clusters from the ratio of their half-mass to Jacobi radii. Mon. Not. R. Astron. Soc. 401, 1832–1838 (2010)
McKay, N. P. F. et al. The discovery of new galaxy members in the NGC 5044 and 1052 groups. Mon. Not. R. Astron. Soc. 352, 1121–1134 (2004)
Caldwell, N. & Romanowsky, A. J. Star clusters in M31. VII. Global kinematics and metallicity subpopulations of the globular clusters. Astrophys. J. 824, 42 (2016)
Franx, M. Galactic Bulges, Proc. 153th Symp. International Astronomical Union (ed. Dejonghe, H. & Habing, H. J. ) 243–262 (IAU, 1993)
Kochanek, C. S. The dynamics of luminous galaxies in isothermal halos. Astrophys. J. 436, 56–66 (1994)
A.J.R. was supported by National Science Foundation grant AST-1616710 and as a Research Corporation for Science Advancement Cottrell Scholar. Results are based on observations obtained with the W. M. Keck Observatory on Mauna Kea, Hawaii. We are grateful for the opportunity to conduct observations from this mountain and wish to acknowledge its important cultural role within the indigenous Hawaiian community.
The authors declare no competing financial interests.
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Extended data figures and tables
The full Dragonfly field, approximately 11 degree2, centred on NGC 1052. The zoom-in shows the immediate surroundings of NGC 1052, with NGC1052–DF2 highlighted in the inset.
Open symbols are galaxies from the Nearby Dwarf Galaxies catalogue15 and the solid symbol with error bars is NGC1052–DF2. The size of each symbol indicates the logarithm of the stellar mass, as shown in the key. There are no galaxies in the Local Group that are similar to NGC1052–DF2. Galaxies with a similar velocity dispersion are a factor of about 10 smaller and have stellar masses that are a factor of about 100 larger. The object labelled And XIX is an Andromeda satellite that is thought to be in the process of tidal disruption55.
We use the surface brightness fluctuation (SBF) signal in the HST I814 band to constrain the distance to NGC1052–DF2. a, The galaxy after subtracting a smooth model and masking background galaxies and globular clusters. The image spans 33″ × 33″. b, The azimuthally averaged power spectrum. Following previous studies9,46,47, the power spectrum is fitted by a combination of a constant (dotted line) and an expectation power spectrum E(k) (dashed line). From the normalization of E(k) we find that the SBF magnitude m814 = 29.45 ± 0.10. The implied distance is DSBF = 19.0 ± 1.7 Mpc, consistent with the 20 Mpc distance of the luminous elliptical galaxy NGC 1052.
a, The sum of g and r images taken with the Dragonfly Telephoto Array. The image was smoothed by a 10″ × 10″ median filter to bring out faint emission. The lowest surface brightness levels visible in the image are about 29 mag arcsec−2. b, Sum of SDSS g, r and i images. In SDSS, the overdensity of compact objects stands out. c, The Gemini-North i-band image of NGC1052–DF2, which provides the best information on the morphology of the galaxy. Black ellipses mark R = Re and R = 2Re. White arrows mark the most obvious reduction artefacts. The galaxy is regular out to at least R ≈ 2Re, with a well-defined centre and a position angle and axis ratio that do not vary strongly with radius.
a, b, Globular cluster velocities as a function of projected position along the major axis (a) and the minor axis (b). There is no evidence for any trends. For reference, a Gaussian with σ = 8.4 km s−1 is shown in b.
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van Dokkum, P., Danieli, S., Cohen, Y. et al. A galaxy lacking dark matter. Nature 555, 629–632 (2018). https://doi.org/10.1038/nature25767
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