SMSS J130522.47−293113.0: a high-latitude stellar X-ray source with pc-scale outflow relics?

Da Costa, G. S. and Soria, R. and Farrell, S. A. and Bayliss, D. and Bessell, M. S. and Vogt, F. P. A. and Zhou, G. ORCID: and Points, S. D. and Beers, T. C. and Lopez-Sanchez, A. R. and Bannister, K. W. and Bell, M. and Hancock, P. J. and Burlon, D. and Gaensler, B. M. and Sadler, E. M. and Tingay, S. and Keller, S. C. and Schmidt, B. P. and Tisserand, P. (2018) SMSS J130522.47−293113.0: a high-latitude stellar X-ray source with pc-scale outflow relics? Monthly Notices of the Royal Astronomical Society, 477 (1). pp. 766-779. ISSN 0035-8711

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We report the discovery of an unusual stellar system SMSS J130522.47-293113.0. The optical spectrum is dominated by a blue continuum together with emission lines of hydrogen, neutral, and ionized helium, and the NIII, CIII blend at ~4640-4650 Å. The emission-line profiles vary in strength and position on time-scales as short as 1 d, while optical photometry reveals fluctuations of as much as ~0.2mag in g on time-scales as short as 10-15 min. The system is a weak X-ray source (f0.3-10 = (1.2 ± 0.1) × 10-13 ergs cm2 s-1 in the 0.3-10 keV band) but is not detected at radio wavelengths (3s upper limit of 50 μJy at 5.5 GHz). The most intriguing property of the system, however, is the existence of two 'blobs', a few arcsec in size, that are symmetrically located 3'. 8 (2.2 pc for our preferred system distance of ~2 kpc) each side of the central object. The blobs are detected in optical and near-IR broad-band images but do not show any excess emission in Hα images. We discuss the interpretation of the system, suggesting that the central object is most likely a nova-like CV, and that the blobs are relics of a pc-scale accretion-powered collimated outflow.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 07 Feb 2022 01:53
Last Modified: 14 Feb 2022 00:40
Uncontrolled Keywords: stars: activity; stars: emission-line; Be; stars: jets; novae; cataclysmic variables; X-rays: binaries; Astrophysics - High Energy; Astrophysical Phenomena
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
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