KUG 0200-096: Dwarf Antennae Hosting a Tidal Dwarf Galaxy

Sanjaya Paudel, Chandreyee Sengupta, Seok-Jin Yoon

Research output: Contribution to journalArticle

Abstract

We study a gas-rich merging dwarf system KUG 0200-096. Deep optical imaging reveals an optically faint tail with a length of 20 kpc, giving a visual impression of tidal antenna similar to NGC 4038/39. The interacting dwarf galaxies have B-band absolute magnitudes of -18.06 and -16.63 mag. We identify a young stellar clump with a stellar mass of 2 × 107 M o at the tip of the antenna, possibly a tidal dwarf galaxy (TDG). The putative TDG candidate is quite blue with a g - r color index of -0.07 mag, whereas the interacting dwarf galaxies have g - r color indices 0.29 and 0.19 mag. The TDG is currently forming stars at the rate of 0.02 M o yr-1. We obtained H i 21 cm line data of KUG 0200-096 using the Giant Metrewave Radio Telescope to get a more detailed view of neutral hydrogen (H i) emission in interacting dwarf galaxies and its TDG. Evidence of a merger between the dwarf galaxy pair is also present in H i kinematics and morphology where we find the H i contents of the interacting pair is disturbed, forming an extended tail toward the TDG. The H i velocity field shows a strong gradient along the H i tidal tail extension. We present a comparative study between the Antennae galaxy, NGC 4038/39, and KUG 0200-096 in both optical and H i gas properties and discuss the possible origin of the KUG 0200-096 TDG.

Original languageEnglish
Article number166
JournalAstronomical Journal
Volume156
Issue number4
DOIs
Publication statusPublished - 2018 Oct 1

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dwarf galaxies
antenna
antennas
interacting galaxies
gas
merger
comparative study
kinematics
hydrogen
radio
color
radio telescopes
clumps
stellar mass
gases
index
velocity distribution
galaxies
stars
gradients

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Paudel, Sanjaya ; Sengupta, Chandreyee ; Yoon, Seok-Jin. / KUG 0200-096 : Dwarf Antennae Hosting a Tidal Dwarf Galaxy. In: Astronomical Journal. 2018 ; Vol. 156, No. 4.
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abstract = "We study a gas-rich merging dwarf system KUG 0200-096. Deep optical imaging reveals an optically faint tail with a length of 20 kpc, giving a visual impression of tidal antenna similar to NGC 4038/39. The interacting dwarf galaxies have B-band absolute magnitudes of -18.06 and -16.63 mag. We identify a young stellar clump with a stellar mass of 2 × 107 M o at the tip of the antenna, possibly a tidal dwarf galaxy (TDG). The putative TDG candidate is quite blue with a g - r color index of -0.07 mag, whereas the interacting dwarf galaxies have g - r color indices 0.29 and 0.19 mag. The TDG is currently forming stars at the rate of 0.02 M o yr-1. We obtained H i 21 cm line data of KUG 0200-096 using the Giant Metrewave Radio Telescope to get a more detailed view of neutral hydrogen (H i) emission in interacting dwarf galaxies and its TDG. Evidence of a merger between the dwarf galaxy pair is also present in H i kinematics and morphology where we find the H i contents of the interacting pair is disturbed, forming an extended tail toward the TDG. The H i velocity field shows a strong gradient along the H i tidal tail extension. We present a comparative study between the Antennae galaxy, NGC 4038/39, and KUG 0200-096 in both optical and H i gas properties and discuss the possible origin of the KUG 0200-096 TDG.",
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KUG 0200-096 : Dwarf Antennae Hosting a Tidal Dwarf Galaxy. / Paudel, Sanjaya; Sengupta, Chandreyee; Yoon, Seok-Jin.

In: Astronomical Journal, Vol. 156, No. 4, 166, 01.10.2018.

Research output: Contribution to journalArticle

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