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Interacting system NGC 7805/6(Arp 112)and its tidal dwarf galaxy candidate

Research in Astronomy and Astrophysics 2021年第2期21卷 149-156页

作者： Zhen-Xing Fu Chandreyee Sengupta Ramya Sethuram Bikram Pradhan Mridweeka Singh kuntal misra TomCScott Yin-Zhe Ma Purple Mountain Observatory(CAS) Nanjing 210034China School of Astronomy and Space Sciences University of Science and Technology of ChinaHefei 230026China Indian Institute of Astrophysics KoramangalaBangalore 560034India Aryabhatta Research Institute of Observational Sciences Manora PeakNainital 263001India Korea Astronomy and Space Science Institute 776 Daedeokdae-roYuseong-guDaejeon 34055Republic of Korea Institute of Astrophysics and Space Sciences(IA) Rua das Estrelas4150-762 PortoPortugal School of Chemistry and Physics University of KwaZulu-NatalWestville CampusPrivate Bag X54001Durban4000South Africa NAOC-UKZN Computational Astrophysics Centre(NUCAC) University of KwaZulu-NatalDurban4000South Africa

We present results from our Giant Metrewave Radio Telescope(GMRT)HⅠ,Himalayan Chandra Telescope(HCT)Hα,1 m Sampurnanand 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+311’s tidal dwarf galaxy(TDG)candidacy and explore the properties of the interacting *** GMRT HⅠmap shows no HⅠdetection associated with KUG 2359+311,nor any HⅠtail or bridge-like structure connecting KUG 2359+311 to the NGC 7805/6 *** HCT Hαimage,on the other hand,displays strong detections in KUG 2359+311,with net SFR0.035±0.009 M_(⊙)yr^(-1).The Hαdata constrain the redshift of KUG 2359+311 to 0.00≤z≤0.043,compared to the redshift of NGC 7806 *** detected to date have all been HⅠrich,and displayed HⅠ,ionised gas and stellar tidal debris trails(bridges or tails)linking them to their parent ***,neither our HⅠdata nor our optical imaging,while three magnitudes deeper than SDSS,reveals a tidal trail connecting KUG 2359+311 to NGC 7805/*** of HⅠ,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 *** 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 *** and metallicity from future spectroscopic observations of KUG 2359+311 would help clarify the nature of this enigmatic structure.

关键词： galaxies dwarf-galaxies interactions-galaxies spiral-galaxies star formation-galaxies peculiar-radio lines galaxies

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