On how to extend the NIR Tully–Fisher relation to be truly all-sky

• DOI: 10.1093/mnras/stu2496
• Publication Date: 2015-01-03T02:04:54Z
• Authors: K. Said; R. C. Kraan-Korteweg; T. H. Jarrett
• Keywords: Tully–Fisher relation; Extinction (optical mineralogy)

Dust extinction and stellar confusion by the Milky Way reduce efficiency of detecting galaxies at low Galactic latitudes, creating so-called Zone Avoidance. This stands as a stumbling block in charting distribution cosmic flow fields, therewith our understanding local dynamics Universe (CMB dipole, convergence radius bulk flows). For instance, ZoA are generally excluded from whole-sky Tully-Fisher Surveys ($|b| \leq 5^\circ$) even if catalogued. We show here that fine-tuning near-infrared TF relation, there is no reason not to extend peculiar velocity surveys deeper into ZoA. Accurate axial ratios ($b/a$) crucial both sample selection resulting distances. simulate effect dust on geometrical properties galaxies. As expected, appear rounder with increasing obscuration level, affecting existing samples. derive correction models demonstrate we can reliably reproduce intrinsic ratio observed value up level about $A_J\simeq3$ mag ($A_V\sim11$ mag), also recover fair fraction otherwise would fall out an uncorrected inclination limited galaxy sample. present re-calibration 2MTF relation NIR $J$, $H$, $K_s$-bands for isophotal rather than total magnitudes, using their same calibration Both relations exhibit similar scatter high latitudes. However, results significant improvement ZoA, surface brightness general, because apertures more robust face confusion.