2013/12/23 by Ivan Katkov, Ivan Yu. Katkov, О. К. Сильченко +6
Physics and Astronomy · #Accretion (finance) #Angular momentum #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #Dwarf galaxy #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Galaxy #Ionization #Metallicity #Physics #Stars #Stellar, planetary, and galactic studies #astro-ph.CO #astro-ph.GA
paper · pdf · doi:10.48550/arxiv.1312.6572
4 pages, 2 figures; ; to appear in the proceedings of "Multi-spin galaxies" conference, Naples, Italy, September 30 - October 3, 2013
arxiv created 2013/12/23 · openalex publication_date 2013/12/23 · arxiv updated 2014/06/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We have studied a sample of completely isolated galaxies by means of long-slit spectroscopy at the 6-m telescope. We have found that 7 of 12 (58 +/- 14 %) galaxies have revealed a presence of large-scale ionized-gas component which angular momentum is mostly differ from stellar one: 5 of 7 (71 +/- 17 %) show a visible counterrottation. The diagnostic diagram demonstrates a wide range of gas excitation mechanism. We have estimated the gas oxygen abundance in the cases where excitation mechanism by young stars dominates and have found that ionized gas has a subsolar metallicity. We concluded that cold-gas accretion from primordial cosmological filaments is unlikely for these objects, while external accretion from dwarf gas-rich satellites is more suitable.