【摘 要】
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We present results from our Giant Metrewave Radio Telescope (GMRT) H I,Himalayan Chandra Telescope (HCT) Hα,1 m Sampumanand Telescope (ST) and 1.3 m Devasthal
【机 构】
：
Purple Mountain Observatory (CAS),Nanjing 210034,China;School of Astronomy and Space Sciences,Univer
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We present results from our Giant Metrewave Radio Telescope (GMRT) H I,Himalayan Chandra Telescope (HCT) Hα,1 m Sampumanand Telescope (ST) and 1.3 m Devasthal Fast Optical Telescope(DFOT) deep optical observations of the NGC 7805/6 (Arp 112) system to test KUG 2359+31 l's tidal dwarf galaxy (TDG) candidacy and explore the properties of the interacting system.Our GMRT H I map shows no H I detection associated with KUG 2359+311,nor any H I tail or bridge-like structure connecting KUG 2359+311 to the NGC 7805/6 system.Our HCT Hα image,on the other hand,displays strong detections in KUG 2359+311,with net SFR ～ 0.035 ± 0.009Mo yr-1.The Hα data constrain the redshift of KUG 2359+311 to 0.00 ≤ z ≤ 0.043,compared to the redshift of NGC 7806 of～ 0.015.TDGs detected to date have all been H I rich,and displayed H I,ionised gas and stellar tidal debris trails (bridges or tails)linking them to their parent systems.However,neither our H I data nor our optical imaging,while three magnitudes deeper than SDSS,reveals a tidal trail connecting KUG 2359+311 to NGC 7805/6.Lack of H I,presence of an old stellar population,ongoing star formation and reasonably high SFR compared to normal dwarf galaxies suggest that KUG 2359+311 may not be an Arp 112 TDG.It is most likely a case of a regular gas-rich dwarf galaxy undergoing a morphological transformation after having lost its entire gas content to an interaction with the Arp 112 system.Redshift and metallicity from future spectroscopic observations of KUG 2359+311 would help clarify the nature of this enigmatic structure.
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