Details

Autor(en) / Beteiligte

• Simons, Raymond C.
• Kassin, Susan A.
• Weiner, Benjamin J.
• Heckman, Timothy M.
• Lee, Janice C.
• Lotz, Jennifer M.
• Peth, Michael
• Tchernyshyov, Kirill

Titel

A transition mass in the local Tully–Fisher relation

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2015-09, Vol.452 (1), p.986-997

Ort / Verlag

London: Oxford University Press

Erscheinungsjahr

2015

Quelle

EZB-FREE-00999 freely available EZB journals

Beschreibungen/Notizen

• We study the stellar mass Tully–Fisher relation (TFR; stellar mass versus rotation velocity) for a morphologically blind selection of emission line galaxies in the field at redshifts 0.1 < z < 0.375. Kinematics (σg, V rot) are measured from emission lines in Keck/DEIMOS spectra and quantitative morphology is measured from V- and I-band Hubble images. We find a transition stellar mass in the TFR, log M */M⊙ = 9.5. Above this mass, nearly all galaxies are rotation dominated, on average more morphologically disc-like according to quantitative morphology, and lie on a relatively tight TFR. Below this mass, the TFR has significant scatter to low rotation velocity and galaxies can either be rotation-dominated discs on the TFR or asymmetric or compact galaxies which scatter off. We refer to this transition mass as the ‘mass of disc formation’, M df because above it all star-forming galaxies form discs (except for a small number of major mergers and highly star-forming systems), whereas below it a galaxy may or may not form a disc.