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A glimpse of the Southern Jellyfish Nebula and its massive YSO

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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 and Wolfire, MG 2007 , 'A glimpse of the Southern Jellyfish Nebula and its massive YSO' , The Astrophysical Journal, vol. 656, no. 1 , pp. 242-247 , doi: 10.1086/510302.

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Abstract

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.

Item Type: Article
Authors/Creators: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
Journal or Publication Title: The Astrophysical Journal
Publisher: University of Chicago Press
ISSN: 0004-637X
DOI / ID Number: 10.1086/510302
Additional Information:

© 2007. The American Astronomical Society.

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