MIGHTEE-HI: the baryonic Tully-Fisher relation over the last billion years

Ponomareva, Anastasia A.; Mulaudzi, Wanga; Maddox, Natasha; Frank, Bradley S.; Jarvis, Matt J.; Di Teodoro, Enrico M.; Glowacki, Marcin; Kraan-Korteweg, Renee C.; Oosterloo, Tom A.; Adams, Elizabeth A. K.; Pan, Hengxing; Prandoni, Isabella; Rajohnson, Sambatriniaina H. A.; Sinigaglia, Francesco; Adams, Nathan J.; Heywood, Ian; Bowler, Rebecca A. A.; Hatfield, Peter W.; Collier, Jordan D. und Sekhar, Srikrishna (2021): MIGHTEE-HI: the baryonic Tully-Fisher relation over the last billion years. In: Monthly Notices of the Royal Astronomical Society, Bd. 508, Nr. 1: S. 1195-1205

Abstract

Using a sample of 67 galaxies from the MeerKAT International GigaHertz Tiered Extragalactic Exploration Survey Early Science data, we study the H I-based baryonic Tully-Fisher relation (bTFr), covering a period of similar to 1 billion years (0 <= z <= 0.081). We consider the bTFr based on two different rotational velocity measures: the width of the global H I profile and V-out, measured as the outermost rotational velocity from the resolved H i rotation curves. Both relations exhibit very low intrinsic scatter orthogonal to the best-fitting relation (sigma(perpendicular to) = 0.07 +/- 0.01), comparable to the SPARC sample at z similar or equal to 0. The slopes of the relations are similar and consistent with the z similar or equal to 0 studies (3.66(-0.29)(+0.35) for W-50 and 3.47(-0.30)(+0.37) for V-out). We find no evidence that the bTFr has evolved over the last billion years, and all galaxies in our sample are consistent with the same relation independent of redshift and the rotational velocity measure. Our results set-up a reference for all future studies of the H I-based bTFr as a function of redshift that will be conducted with the ongoing deep SKA pathfinders surveys.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0035-8711
• Sprache: Englisch