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

Mancera Piña, Pavel E.; Fraternali, Filippo; Adams, Elizabeth A.K.; Marasco, Antonino; Oosterloo, Tom; Oman, Kyle A.; Leisman, Lukas; di Teodoro, Enrico M.; Posti, Lorenzo; Battipaglia, Michael; Cannon, John M.; Gault, Lexi; Haynes, Martha P.; Janowiecki, Steven; McAllan, Elizabeth; Pagel, Hannah J.; Reiter, Kameron; Rhode, Katherine L.; Salzer, John J.; Smith, Nicholas J.

doi:10.3847/2041-8213/ab40c7

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

Mancera Piña, Pavel E.; Fraternali, Filippo; Adams, Elizabeth A.K.; Marasco, Antonino; Oosterloo, Tom; Oman, Kyle A.; Leisman, Lukas; di Teodoro, Enrico M.; Posti, Lorenzo; Battipaglia, Michael; Cannon, John M.; Gault, Lexi; Haynes, Martha P.; Janowiecki, Steven; McAllan, Elizabeth; Pagel, Hannah J.; Reiter, Kameron; Rhode, Katherine L.; Salzer, John J.; Smith, Nicholas J.

Authors

Pavel E. Mancera Piña

Filippo Fraternali

Elizabeth A.K. Adams

Antonino Marasco

Tom Oosterloo

Dr Kyle Oman kyle.a.oman@durham.ac.uk
Assistant Professor - Royal Society Dorothy Hodgkin Fellow

Lukas Leisman

Enrico M. di Teodoro

Lorenzo Posti

Michael Battipaglia

John M. Cannon

Lexi Gault

Martha P. Haynes

Steven Janowiecki

Elizabeth McAllan

Hannah J. Pagel

Kameron Reiter

Katherine L. Rhode

John J. Salzer

Nicholas J. Smith

Abstract

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 3DBarolo 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.

Citation

Mancera Piña, P. E., Fraternali, F., Adams, E. A., Marasco, A., Oosterloo, T., Oman, K. A., …Smith, N. J. (2019). Off the Baryonic Tully–Fisher Relation: A Population of Baryon-dominated Ultra-diffuse Galaxies. Astrophysical Journal Letters, 883(2), Article L33. https://doi.org/10.3847/2041-8213/ab40c7

Journal Article Type	Article
Acceptance Date	Sep 1, 2019
Online Publication Date	Sep 25, 2019
Publication Date	Oct 1, 2019
Deposit Date	Oct 27, 2021
Publicly Available Date	Oct 27, 2021
Journal	Astrophysical Journal Letters
Print ISSN	2041-8205
Electronic ISSN	2041-8213
Publisher	American Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	883
Issue	2
Article Number	L33
DOI	https://doi.org/10.3847/2041-8213/ab40c7
Related Public URLs	https://arxiv.org/pdf/1909.01363

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This is an author-created, un-copyedited version of an article published in Astrophysical Journal Letters. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version
derived from it. The Version of Record is available online at https://doi.org/10.3847/2041-8213/ab40c7