http://eprints.utas.edu.au/4098/ A glimpse of the Southern Jellyfish Nebula and its massive YSO Mercer, EP Wolff, MJ Bania, TM Benjamin, RA Cohen, M Dickey, JM Jackson, JM Kobulnicky, HA Mathis, JS Stolovy, SR Uzpen, B Clemens, DP Churchwell, EB Rathborne, JM Meade, MR Babler, BL Indebetouw, R Whitney, BA Watson, C Wolfire, MG 240101 Astronomy and Astrophysics In Spitzer/IRAC images obtained under the GLIMPSE Legacy Survey, we have identified a unique and provocative nebular object we call the ‘‘Southern Jellyfish Nebula.’’ The Southern Jellyfish Nebula is characterized by a fan of narrow tendrils with extreme length-to-width ratios that emanate from the vicinity of a bright infrared point source embedded in a smaller resolved nebula. From CO observations of the Nebula’s morphologically associated molecular cloud, we have derived a kinematic distance of 5:7 0:8 kpc and a cloud mass of 3:2 0:9 ; 103 M. The tendril-like ropes of the Nebula have widths of 0.1 pc and lengths of up to 2 pc. We have integrated the infrared spectral energy distribution (SED) of the point source to establish it as a massive young stellar object (MYSO), most likely forming alone, but possibly masking fainter cluster members. The shape of the SED is consistent with the shape of a late Class 0 SED model. Based on its far-IR luminosity of 3:3 0:9 ; 104 L, the Southern Jellyfish’sMYSO has a zero-age main sequence (ZAMS) spectral type of B0. Given the curious nature of this nebula, we suspect its peculiar IR-bright structure is directly related to its current state of star formation. University of Chicago Press 2007 Article PeerReviewed application/pdf http://eprints.utas.edu.au/4098/1/4098.pdf http://dx.doi.org/10.1086/510302 Mercer, EP and Wolff, MJ and Bania, TM and Benjamin, RA and Cohen, M and Dickey, JM and Jackson, JM and Kobulnicky, HA and Mathis, JS and Stolovy, SR and Uzpen, B and Clemens, DP and Churchwell, EB and Rathborne, JM and Meade, MR and Babler, BL and Indebetouw, R and Whitney, BA and Watson, C and Wolfire, MG (2007) A glimpse of the Southern Jellyfish Nebula and its massive YSO. The Astrophysical Journal, 656 (1). pp. 242-247. ISSN 0004-637X http://eprints.utas.edu.au/4098/http://eprints.utas.edu.au/4098/1/