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

Pavel E. Mancera Piña; Filippo Fraternali; Elizabeth A.K. Adams; Antonino Marasco; Tom Oosterloo; Kyle A. Oman; 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

doi:10.3847/2041-8213/ab40c7

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

Pavel E. Mancera Piña, Filippo Fraternali, Elizabeth A.K. Adams, Antonino Marasco, Tom Oosterloo, Kyle A. Oman, 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

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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.

Original language	English
Article number	L33
Journal	Astrophysical Journal Letters
Volume	883
Issue number	2
DOIs	https://doi.org/10.3847/2041-8213/ab40c7
Publication status	Published - 1 Oct 2019

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Mancera Piña, P. E., Fraternali, F., Adams, E. A. K., Marasco, A., Oosterloo, T., Oman, K. A., Leisman, L., Di Teodoro, E. M., Posti, L., Battipaglia, M., Cannon, J. M., Gault, L., Haynes, M. P., Janowiecki, S., McAllan, E., Pagel, H. J., Reiter, K., Rhode, K. L., Salzer, J. J., & 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

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

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.",

author = "{Mancera Pi{\~n}a}, {Pavel E.} and Filippo Fraternali and Adams, {Elizabeth A.K.} and Antonino Marasco and Tom Oosterloo and Oman, {Kyle A.} and Lukas Leisman and {Di Teodoro}, {Enrico M.} and Lorenzo Posti and Michael Battipaglia and Cannon, {John M.} and Lexi Gault and Haynes, {Martha P.} and Steven Janowiecki and Elizabeth McAllan and Pagel, {Hannah J.} and Kameron Reiter and Rhode, {Katherine L.} and Salzer, {John J.} and Smith, {Nicholas J.}",

year = "2019",

month = oct,

day = "1",

doi = "10.3847/2041-8213/ab40c7",

language = "English",

volume = "883",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

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Mancera Piña, PE, Fraternali, F, Adams, EAK, Marasco, A, Oosterloo, T, Oman, KA, Leisman, L, Di Teodoro, EM, Posti, L, Battipaglia, M, Cannon, JM, Gault, L, Haynes, MP, Janowiecki, S, McAllan, E, Pagel, HJ, Reiter, K, Rhode, KL, Salzer, JJ & Smith, NJ 2019, 'Off the Baryonic Tully-Fisher Relation: A Population of Baryon-dominated Ultra-diffuse Galaxies', Astrophysical Journal Letters, vol. 883, no. 2, L33. https://doi.org/10.3847/2041-8213/ab40c7

TY - JOUR

T1 - Off the Baryonic Tully-Fisher Relation

T2 - A Population of Baryon-dominated Ultra-diffuse Galaxies

AU - Mancera Piña, Pavel E.

AU - Fraternali, Filippo

AU - Adams, Elizabeth A.K.

AU - Marasco, Antonino

AU - Oosterloo, Tom

AU - Oman, Kyle A.

AU - Leisman, Lukas

AU - Di Teodoro, Enrico M.

AU - Posti, Lorenzo

AU - Battipaglia, Michael

AU - Cannon, John M.

AU - Gault, Lexi

AU - Haynes, Martha P.

AU - Janowiecki, Steven

AU - McAllan, Elizabeth

AU - Pagel, Hannah J.

AU - Reiter, Kameron

AU - Rhode, Katherine L.

AU - Salzer, John J.

AU - Smith, Nicholas J.

PY - 2019/10/1

Y1 - 2019/10/1

N2 - 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.

AB - 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.

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U2 - 10.3847/2041-8213/ab40c7

DO - 10.3847/2041-8213/ab40c7

M3 - Article

SN - 2041-8205

VL - 883

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

M1 - L33

ER -

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

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