| Interacting system NGC 7805/6(Arp 112)and its tidal dwarf galaxy candidate |
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| 作者姓名： | Zhen-Xing Fu Chandreyee Sengupta Ramya Sethuram Bikram Pradhan Mridweeka Singh Kuntal Misra TomCScott Yin-Zhe Ma |
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| 作者单位： | Purple Mountain Observatory（CAS）;School of Astronomy and Space Sciences;Indian Institute of Astrophysics;Aryabhatta Research Institute of Observational Sciences;Korea Astronomy and Space Science Institute;Institute of Astrophysics and Space Sciences（IA）;School of Chemistry and Physics;NAOC-UKZN Computational Astrophysics Centre（NUCAC） |
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| 基金项目： | support by Fundacao paraa Ciencia e a Tecnologia(FCT)through national funds(UID/FIS/04434/2013);FCT/MCTES through national funds(PIDDAC)by this grant UID/FIS/04434/2019;by FEDER through COMPETE2020(POCI-01-0145FED ER-007672);support from DL 57/2016/CP1364/CT0009;the support of NRF(Grant Nos.105925,109577,120385,and 120378);the National Natural Science Foundation of China(Grant No.11828301)。 |
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| 摘 要： | 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 system.Our 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 system.Our 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 of0.015.TDGs 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 systems.However,neither our HⅠdata nor our optical imaging,while three magnitudes deeper than SDSS,reveals a tidal trail connecting KUG 2359+311 to NGC 7805/6.Lack 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 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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| 关 键 词： | GALAXIES dwarf-galaxies interactions-galaxies spiral-galaxies star formation-galaxies peculiar-radio lines GALAXIES |
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