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

Back

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

Journal article

Open access

Peer reviewed

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, …

Astrophysical journal. Letters, Vol.883(2), p.L33

10/01/2019

DOI: 10.3847/2041-8213/ab40c7

Files and links (1)

url

https://doi.org/10.3847/2041-8213/ab40c7View

Published (Version of record) Open Access

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.

Dark matter

Dwarf galaxies

Galaxy dynamics

Galaxy evolution

Galaxy formation

Galaxy kinematics

Galaxy rotation curves

Low surface brightness galaxies

Details

Title: Subtitle: Off the Baryonic Tully-Fisher Relation: A Population of Baryon-dominated Ultra-diffuse Galaxies
Creators: Pavel E. Mancera Piña - Netherlands Institute for Radio Astronomy
Filippo Fraternali - University of Groningen
Elizabeth A. K. Adams - Netherlands Institute for Radio Astronomy
Antonino Marasco - University of Groningen
Tom Oosterloo - Netherlands Institute for Radio Astronomy
Kyle A. Oman - University of Groningen
Lukas Leisman - Valparaiso University
Enrico M. di Teodoro - Australian National University
Lorenzo Posti - Observatory of Strasbourg
Michael Battipaglia - Valparaiso University
John M. Cannon - Macalester College
Lexi Gault - Valparaiso University
Martha P. Haynes - Cornell University
Steven Janowiecki - University of Texas , Hobby-Eberly Telescope, McDonald Observatory, TX 79734, USA
Elizabeth McAllan - Valparaiso University
Hannah J. Pagel - Indiana University Bloomington
Kameron Reiter - Valparaiso University
Katherine L. Rhode - Indiana University Bloomington
John J. Salzer - Indiana University Bloomington
Nicholas J. Smith - Indiana University Bloomington
Resource Type: Journal article
Publication Details: Astrophysical journal. Letters, Vol.883(2), p.L33
Publisher: The American Astronomical Society
DOI: 10.3847/2041-8213/ab40c7
ISSN: 2041-8205
eISSN: 2041-8213
Number of pages: 6
Alternative title: Off the Baryonic Tully-Fisher Relation: A Population of Baryon-dominated Ultra-diffuse Galaxies
Language: English
Date published: 10/01/2019
Academic Unit: Physics and Astronomy
Record Identifier: 9984627284602771

Metrics

1 Record Views

See more details