New HI observations of KK 69. Is KK 69 a dwarf galaxy in transition?

J. SAPONARA; B. KORIBALSKI; N. N. PATRA; P. BENAGLIA

ASTROPHYSICS AND SPACE SCIENCE

SPRINGER

Lugar: Berlin; Año: 2020

0004-640X

We present new HI data of the dwarf galaxy KK 69, obtained with the GiantMetrewave Radio Telescope (GMRT) with a signal-to-noise ratio that almostdouble previous observations. We carried out a Gaussian spectral decomposition and stacking methods to identify the cold neutral medium (CNM) and the warm neutral medium (WNM) of the HI gas. We found that 30% of the total HI gas, which corresponds to a mass of approx. 10^7 Mo, is in the CNM phase. The distribution of the HI in KK 69 is not symmetric. Our GMRT KK 69 overlaid onto a Hubble Space Telescope image reveals an offset of 4 kpc between the HI high-density region and the stellar body, indicating may be a dwarf transitional galaxy. The offset, along with the potentialtruncation of the HI body, are evidence of interaction with the central group spiral galaxy NGC 2683, indicating the HI gas is being stripped from Additionally, we detected extended HI emission of a dwarf galaxy member of group as well as a possible new galaxy located near the north-eastern part the NGC 2683 HI disk.