Abstract Details

Name: Ananta Pradhan
Affiliation: National Institute of Technology Rourkela
Conference ID: ASI2020_273
Title : A catalogue of 108 extended planetary nebulae observed by GALEX.
Authors and Co-Authors : Ananta C. Pradhan (Department of Physics & Astronomy, National Institute of Technology, Rourkela), Swayamtrupta Panda (Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland), Mudumba Parthasarathy (Indian Institute of Astrophysics, II Block, Koramangala, Bangalore), Jayant Murthy (Indian Institute of Astrophysics, II Block, Koramangala, Bangalore), Devendra K. Ojha (Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai)
Abstract Type : Oral
Abstract Category : Stars, ISM and Galaxy
Abstract : We present the ultraviolet (UV) imaging observation of planetary nebulae (PNe) using archival data of Galaxy Evolution Explorer (GALEX). We found 358 PNe detected by GALEX in near-UV (NUV). We have compiled a catalogue of 108 extended PNe with sizes greater than 8 arcsec and provided the angular diameters for all the 108 extended PNe in NUV and 28 in FUV from the GALEX images considering 3σ surface brightness level above the background. Of the 108 PNe, 74 are elliptical, 24 are circular and 10 are bipolar in NUV with most being larger in the UV than in the radio, Hα or optical. We derived luminosities for 33 PNe in FUV (L_FUV ) and 89 PNe in NUV (L_NUV ) and found that most of the sources are very bright in UV. The FUV emission of the GALEX band includes contribution from prominent emission lines N IV] (1487 Å), C IV (1550 Å), and O III] (1661 Å) whereas the NUV emission includes C III] (1907 Å) and C II (2325 Å) for PNe of all excitation classes. The other emission lines seen in low excitation PNe are O IV] (1403 Å) and N III (1892 Å) in FUV, and O II (2470 Å) and Mg II (2830 Å) in NUV. Similarly the emission lines O V (1371 Å) and He II (1666 Å) strongly contribute in FUV for high and medium excitation PNe but not for low excitation PNe. A mixture of other emission lines seen in all excitation PNe. We have also provided images of 34 PNe in NUV and 9 PNe in FUV.