MIGHTEE H
Springer Link (Chiba Institute of Technology)
Abstract
Untargeted neutral hydrogen (H I) surveys are well suited to identifying low surface brightness galaxies (LSBGs) that are gas rich, and they offer a complementary view to optically selected populations. We examined the LSBG population as identified via stellar and gaseous content using the MIGHTEE H I XMM-LSS early science data and the publicly available catalogs of optically identified LSBGs. There is currently little overlap between these datasets, with only three galaxies commonly detected. We performed surface brightness photometry of selected MIGHTEE H I detections to find 29 LSBGs, and 26 of these meet the size requirement (Reff > 1.5 kpc) to be ultra-diffuse galaxies (UDGs). Furthermore, we extracted H I spectra at the location of all optically identified galaxies, placing upper limits on the H I-to-stellar mass ratio in these systems. While the H I-identified population overall tends toward bluer colors, the H I-identified and the optically selected samples mostly overlap in mean effective surface brightness, effective radii, and color. Although it is not straightforward to discern why the H I-identified LSBGs were missed in optical searches, this work highlights the utility of H I surveys in finding these faint systems. The H I-identified LSBGs are gas rich compared to the general H I-selected population. Furthermore, three out of four H I-selected UDGs with available kinematics show no systematic offset from the baryonic Tully-Fisher relation, although we are biased away from sources with low rotational velocities due to the low spectral resolution of the data. This work demonstrates the utility of H I observations for finding and characterizing the low surface brightness Universe.
Authors 11
-
University of Groningen · Netherlands Institute for Radio Astronomy
Affiliation as printed
ASTRON , Netherlands Institute for Radio Astronomy , Oude Hoogeveensedijk 4 , 7991 PD Dwingeloo , The Netherlands
Kapteyn Astronomical Institute , University of Groningen , Postbus 800 , 9700 AV Groningen , The Netherlands
-
University of Groningen · Netherlands Institute for Radio Astronomy
Affiliation as printed
ASTRON , Netherlands Institute for Radio Astronomy , Oude Hoogeveensedijk 4 , 7991 PD Dwingeloo , The Netherlands
Kapteyn Astronomical Institute , University of Groningen , Postbus 800 , 9700 AV Groningen , The Netherlands
-
University of Hertfordshire · University of Oxford
Affiliation as printed
Astrophysics , Department of Physics , University of Oxford , Keble Road , Oxford OX1 3RH , UK
Centre for Astrophysics Research , School of Physics, Astronomy and Mathematics , University of Hertfordshire , College Lane
-
Affiliation as printed
School of Physics , H.H. Wills Physics Laboratory , Tyndall Avenue , University of Bristol , Bristol , BS8 1TL , UK
-
Leiden University · Leiden Observatory
Affiliation as printed
Leiden Observatory , Leiden University , P.O. Box 9513 , 2300 RA , Leiden , The Netherlands
-
Affiliation as printed
Sterrenkundig Observatorium , Krijgslaan 281 S9 , B-9000 Gent , Belgium
-
Royal Observatory · UK Astronomy Technology Centre
Affiliation as printed
STFC UK Astronomy Technology Centre , Royal Observatory , Edinburgh , Blackford Hill , Edinburgh , EH9 3HJ
-
Royal Observatory · University of Edinburgh
Affiliation as printed
Institute for Astronomy , University of Edinburgh , Royal Observatory , Edinburgh EH9 3HJ , UK
-
University of Oxford · University of the Western Cape
Affiliation as printed
Astrophysics , Department of Physics , University of Oxford , Keble Road , Oxford , OX1 3RH , UK
Department of Physics and Astronomy , University of the Western Cape , Robert Sobukwe Road , 7535 Bellville , Cape Town , South Africa
-
Osservatorio Astronomico di Cagliari
Affiliation as printed
INAF -Osservatorio Astronomico di Cagliari , Via della Scienza 5 , I-09047 Selargius ( CA) , Italy
Cited by 0 stored of 0
No patents citing this paper on Lens.org (checked 2026-10-11).