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

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Abstract

We present new H i data of the dwarf galaxy KK 69, obtained with the Giant Metrewave Radio Telescope (GMRT) with a signal-to-noise ratio almost double 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 H i gas. We found that 30% of the total H i gas, which corresponds to a mass of ∼107 M⊙, is in the CNM phase. The distribution of the H i in KK 69 is not symmetric. Our GMRT H i intensity map of KK 69 overlaid onto a Hubble Space Telescope image reveals an offset of ∼4 kpc between the H i high-density region and the stellar body, indicating it may be a dwarf transitional galaxy. The offset, along with the potential truncation of the H i body, are evidence of interaction with the central group spiral galaxy NGC 2683, indicating the H i gas is being stripped from KK 69. Additionally, we detected extended H i emission of a dwarf galaxy member of the group as well as a possible new galaxy located near the north-eastern part of the NGC 2683 H i disk.

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Notes

  1. \(M_{\mathrm{dyn}}=2.31 \times 10^{5}\) r[kpc] \((v_{\mathrm{rot}}/\sin(\mathrm{i}_{\mathrm{HI}}))^{2}\).

  2. \((3/2)kT=(1/2)m_{p} \sigma ^{2}\).

  3. \(N_{\mathrm{gas}}= 1.33 \times N_{ \mathrm{HI}} \approx 5\times 10^{21}\) atoms cm−2 corrected for He abundance.

  4. \(\tau _{\mathrm{gas}}= 1.32 \times M_{ \mathrm{HI}} /SFR\); the factor 1.32 takes into account the presence of He.

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Acknowledgements

The radio data presented here were obtained with the Giant Metrewave Radio Telescope (GMRT). The GMRT is operated by the National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research. JS is greateful to the GMRT and NCRA staff for their hospitality during her stay. This research has made use of the NASA/IPAC extragalactic database (NED) that is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration and of SIMBAD data base, operated at CDS, Strasbourg, France. This work was partially supported by FCAG-UNLP and ANPCyT project PICT 2012-878.

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Authors and Affiliations

  1. Instituto Argentino de Radioastronomía, (CONICET; CICPBA), C.C. No. 5, 1894, Villa Elisa, Argentina

    J. Saponara & P. Benaglia

  2. Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, 1900, La Plata, Argentina

    J. Saponara & P. Benaglia

  3. CSIRO Astronomy & Space Science, Australia Telescope National Facility, P.O. Box 76, Epping, NSW, 1710, Australia

    B. S. Koribalski

  4. National Centre for Radio Astrophysics, Tata Institute of Fundamental Research (NCRA-TIFR), Pune, 411 007, India

    N. N. Patra

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Saponara, J., Koribalski, B.S., Patra, N.N. et al. New H i observations of KK 69. Is KK 69 a dwarf galaxy in transition?. Astrophys Space Sci 365, 111 (2020). https://doi.org/10.1007/s10509-020-03825-2

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