@article{2e2a171b07e54cd7838f07370969eea1,
title = "AGC198606: A gas-bearing dark matter minihalo?",
abstract = "We present neutral hydrogen (H' i) imaging observations with the Westerbork Synthesis Radio Telescope of AGC198606, an H' i cloud discovered in the ALFALFA 21cm survey. This object is of particular note as it is located 16 km s-1 and 1. 2 from the gas-bearing ultra-faint dwarf galaxy Leo T while having a similar H' i linewidth and approximately twice the flux density. The H' i imaging observations reveal a smooth, undisturbed H' i morphology with a full extent of 23′ × 16′ at the 5 × 1018 atoms' cm-2 level. The velocity field of AGC198606 shows ordered motion with a gradient of ∼25 km s-1 across ∼20′. The global velocity dispersion is 9.3 km s-1 with no evidence for a narrow spectral component. No optical counterpart to AGC198606 is detected. The distance to AGC198606 is unknown, and we consider several different scenarios: physical association with Leo T, a minihalo at a distance of ∼150 kpc based on the models of Faerman et al. (2013, ApJ, 777, 119), and a cloud in the Galactic halo. At a distance of 420 kpc, AGC198606 would have an H' i mass of 6.2 × 105 M⊙, an H' i radius of 1.4 kpc, and a dynamical mass within the H' i extent of 1.5 × 108 M⊙.",
keywords = "Galaxies: ISM, Galaxies: dwarf, Local group, Radio lines: galaxies",
author = "Adams, {E. A.K.} and Y. Faerman and Janesh, {W. F.} and S. Janowiecki and Oosterloo, {T. A.} and Rhode, {K. L.} and R. Giovanelli and Haynes, {M. P.} and Salzer, {J. J.} and A. Sternberg and Cannon, {J. M.} and Mu{\~n}oz, {R. R.}",
note = "Publisher Copyright: {\textcopyright} ESO, 2014.",
year = "2015",
month = jan,
day = "1",
doi = "10.1051/0004-6361/201425211",
language = "אנגלית",
volume = "573",
journal = "Astronomy and Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",
}