Journal article
Robust H I kinematics of gas-rich ultra-diffuse galaxies: hints of a weak-feedback formation scenario
Monthly notices of the Royal Astronomical Society, Vol.495(4), pp.3636-3655
07/11/2020
DOI: 10.1093/mnras/staa1256
Abstract
We study the gas kinematics of a sample of six isolated gas-rich low surface brightness galaxies, of the class called ultra-diffuse galaxies (UDGs). These galaxies have recently been shown to be outliers from the baryonic Tully-Fisher relation (BTFR), as they rotate much slower than expected given their baryonic mass, and to have a baryon fraction similar to the cosmological mean. By means of a 3D kinematic modelling fitting technique, we show that the H I in our UDGs is distributed in 'thin' regularly rotating discs and we determine their rotation velocity and gas velocity dispersion. We revisit the BTFR adding galaxies from other studies. We find a previously unknown trend between the deviation from the BTFR and the exponential disc scale length valid for dwarf galaxies with circular speeds less than or similar to 45 km s(-1), with our UDGs being at the extreme end. Based on our findings, we suggest that the high baryon fractions of our UDGs may originate due to the fact that they have experienced weak stellar feedback, likely due to their low star formation rate surface densities, and as a result they did not eject significant amounts of gas out of their discs. At the same time, we find indications that our UDGs may have higher-than-average stellar specific angular momentum, which can explain their large optical scale lengths.
Details
- Title: Subtitle
- Robust H I kinematics of gas-rich ultra-diffuse galaxies: hints of a weak-feedback formation scenario
- Creators
- Pavel E. Mancera Pina - University of GroningenFilippo Fraternali - University of GroningenKyle A. Oman - University of GroningenElizabeth A. K. Adams - Netherlands Institute for Radio AstronomyCecilia Bacchini - University of GroningenAntonino Marasco - Arcetri Astrophysical ObservatoryTom Oosterloo - Netherlands Institute for Radio AstronomyGabriele Pezzulli - ETH ZurichLorenzo Posti - Observatory of StrasbourgLukas Leisman - Valparaiso UniversityJohn M. Cannon - Macalester CollegeEnrico M. di Teodoro - Johns Hopkins UniversityLexi Gault - Valparaiso UniversityMartha P. Haynes - Cornell UniversityKameron Reiter - Valparaiso UniversityKatherine L. Rhode - Indiana University BloomingtonJohn J. Salzer - Indiana University BloomingtonNicholas J. Smith - Indiana University Bloomington
- Resource Type
- Journal article
- Publication Details
- Monthly notices of the Royal Astronomical Society, Vol.495(4), pp.3636-3655
- Publisher
- Oxford Univ Press
- DOI
- 10.1093/mnras/staa1256
- ISSN
- 0035-8711
- eISSN
- 1365-2966
- Number of pages
- 20
- Grant note
- Centre National d' Etudes Spatiales (CNES); Centre National D'etudes Spatiales 016.130.338 / Netherlands Organization for Scientific Research (NWO) NWO; Netherlands Organization for Scientific Research (NWO) 10.1.5.6 / Netherlands Research School for Astronomy (Nederlandse Onderzoekschool voor Astronomie, NOVA) Brinson Foundation PP00P2 163824 / Swiss National Science Foundation; Swiss National Science Foundation (SNSF) AST-1615483 / NSF; National Science Foundation (NSF) WISE research programme
- Language
- English
- Date published
- 07/11/2020
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627290502771
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