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Out the Baryonic Tully-Fisher relation: A population of baryon-dominated ultra-diffuse galaxies
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., Cault, L., Haynes, M. P., Janowiecki, S., McAllan, E., Pagel, H. J., Reiter, K., Rhode, K. L., Salzer, J. J. & Smith, N. J., 1-Oct-2019, In : Astrophysical Journal Letters. 883, 2, 6 p., L33.Research output: Contribution to journal › Article › Academic › peer-review
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Out the Baryonic Tully-Fisher relation : A population of baryon-dominated ultra-diffuse galaxies. / Mancera Piña, Pavel E.; Fraternali, Filippo; Adams, Elisabeth A.K.; Marasco, Antonino; Oosterloo, Tom; Oman, Kyle A.; Leisman, Lukas; di Teodoro, Enrico M.; Posti, Lorenzo; Battipaglia, Michael; Cannon, John M.; Cault, Lexi; Haynes, Martha P.; Janowiecki, Steven; McAllan, Elisabeth; Pagel, Hanna J.; Reiter, Kameron; Rhode, Katherine L.; Salzer, John J.; Smith, Nicholas J.
In: Astrophysical Journal Letters, Vol. 883, No. 2, L33, 01.10.2019.Research output: Contribution to journal › Article › Academic › peer-review
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TY - JOUR
T1 - Out the Baryonic Tully-Fisher relation
T2 - A population of baryon-dominated ultra-diffuse galaxies
AU - Mancera Piña, Pavel E.
AU - Fraternali, Filippo
AU - Adams, Elisabeth 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 - Cault, Lexi
AU - Haynes, Martha P.
AU - Janowiecki, Steven
AU - McAllan, Elisabeth
AU - Pagel, Hanna 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 (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.
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 (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.
KW - DARK-MATTER
KW - ROTATION CURVES
KW - MASS
U2 - 10.3847/2041-8213/ab40c7
DO - 10.3847/2041-8213/ab40c7
M3 - Article
VL - 883
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
SN - 2041-8205
IS - 2
M1 - L33
ER -
ID: 97549198