A 5deg x 5deg deep H i survey of the M81 group. Issue 1 (11th March 2019)

• Record Type: Journal Article
• Authors: Sorgho, A; Foster, T; Carignan, C; Chemin, L
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 486:Issue 1(2019)
• Page Start: 504
• Page End: 522
• Publication Date: 2019-03-11
• Subjects: galaxies: evolution -- galaxies: groups -- galaxies: individual: M81, M82, NGC 3077, NGC 2976, IC 2574, Ho IX -- galaxies: ISM -- galaxies: interactions -- galaxies: kinematics and dynamics; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stz696
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: A $25\, \rm deg^2$ region, including the M81 complex (M81, M82, and NGC 3077), NGC 2976, and IC2574, was mapped during ∼3000 h with the DRAO synthesis telescope. With a physical resolution of ∼1 kpc, these observations allow us to probe a large region down to column density levels of ${\sim }1\times 10^{18}\, \rm cm^{-2}$ over 16 km s −1, mapping the extent of the H i arm connecting the system and NGC 2976, and resolving the H i clouds adjacent to the arm. The observations also reveal a few clouds located between the system and IC 2574, probably tidally stripped from a past interaction between the two systems. Given the regular velocity distribution in the H i envelope of the system, we attempt and derive an idealized large-scale rotation curve of the system. We observe a flat trend for the rotation velocity of the overall system from 20 kpc out to 80 kpc, well beyond the outskirts of the M81 disk, although with asymmetries like a wiggle at the vicinity of M82. This supports the assumption that intergalactic gas and galaxies in the system participate to a large-scale ordered rotation motion which is dominated by M81. Also, our H i analysis of the group further supports the hypothesis that the galaxies forming the system moved closer from afar, in agreement with numerical simulations.