Off the Baryonic Tully-Fisher Relation: A Population of Baryon-dominated Ultra-diffuse Galaxies

被引:78
|
作者
Pina, Pavel E. Mancera [1 ,2 ]
Fraternali, Filippo [1 ]
Adams, Elizabeth A. K. [1 ,2 ]
Marasco, Antonino [1 ,2 ]
Oosterloo, Tom [1 ,2 ]
Oman, Kyle A. [1 ]
Leisman, Lukas [3 ]
di Teodoro, Enrico M. [4 ]
Posti, Lorenzo [5 ]
Battipaglia, Michael [3 ]
Cannon, John M. [6 ]
Gault, Lexi [3 ]
Haynes, Martha P. [7 ]
Janowiecki, Steven [8 ]
McAllan, Elizabeth [3 ]
Pagel, Hannah J. [9 ]
Reiter, Kameron [3 ]
Rhode, Katherine L. [9 ]
Salzer, John J. [9 ]
Smith, Nicholas J. [9 ]
机构
[1] Univ Groningen, Kapteyn Astron Inst, Landleven 12, NL-9747 AD Groningen, Netherlands
[2] Netherlands Inst Radio Astron, ASTRON, Postbus 2, NL-7900 AA Dwingeloo, Netherlands
[3] Valparaiso Univ, Dept Phys & Astron, 1610 Campus Dr East, Valparaiso, IN 46383 USA
[4] Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia
[5] Univ Strasbourg, CNRS, UMR 7550, Observ Astron Strasbourg, 11 Rue Univ, F-67000 Strasbourg, France
[6] Macalester Coll, Dept Phys & Astron, 1600 Grand Ave, St Paul, MN 55105 USA
[7] Cornell Univ, Cornell Ctr Astrophys & Planetary Sci, Space Sci Bldg, Ithaca, NY 14853 USA
[8] Univ Texas, Hobby Eberly Telescope, Mcdonald Observ, TX 79734 USA
[9] Indiana Univ, Dept Astron, 727 East Third St, Bloomington, IN 47405 USA
关键词
DARK-MATTER; ROTATION CURVES; MASS;
D O I
10.3847/2041-8213/ab40c7
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We study the gas kinematics traced by the 21 cm emission of a sample of six H I-rich low surface brightness galaxies classified as ultra-diffuse galaxies (UDGs). Using the 3D kinematic modeling code (3D)Barolo we derive robust circular velocities, revealing a startling feature: H I-rich UDGs are clear outliers from the baryonic Tully-Fisher relation, with circular velocities much lower than galaxies with similar baryonic mass. Notably, the baryon fraction of our UDG sample is consistent with the cosmological value: these UDGs are compatible with having no "missing baryons" within their virial radii. Moreover, the gravitational potential provided by the baryons is sufficient to account for the amplitude of the rotation curve out to the outermost measured point, contrary to other galaxies with similar circular velocities. We speculate that any formation scenario for these objects will require very inefficient feedback and a broad diversity in their inner dark matter content.
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收藏
页数:6
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