XMMSL1 J060636.2-694933: an XMM-Newton slew discovery and Swift/Magellan follow up of a new classical nova in the LMC
Dept. of Physics and Astronomy, Leicester University, Leicester LE1 7RH, UK e-mail: firstname.lastname@example.org
2 XMM-Newton SOC, ESAC, Apartado 78, 28691 Villanueva de la Cañada, Madrid, Spain
3 SRON, Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA, Utrecht, The Netherlands
4 Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA
5 Warsaw University Observatory, A1. Ujazdowskie 4, 00-478, Warsaw, Poland
6 Max-Planck-Institut für extraterrestrische Physik, 85748 Garching, Germany
7 University of California, 601 Campbell Hall, Berkeley, CA 94720, USA
Accepted: 24 August 2009
Aims. In order to discover new X-ray transients, the data taken by XMM-Newton as it slews between targets are being processed and cross-correlated with other X-ray observations.
Methods. A bright source, XMMSL1 J060636.2-694933, was detected on 18 July 2006 at a position where no previous X-ray source had been seen. The XMM-Newton slew data, plus follow-up dedicated XMM-Newton and Swift observations, plus optical data acquired with the Magellan Clay telescope, and archival All-Sky Automated Survey (ASAS) data were used to classify the new object, and to investigate its properties.
Results. No XMM-Newton slew X-ray counts are detected above 1 keV and the source is seen to be over five hundred times brighter than the ROSAT All-Sky Survey upper limit at that position. The line-rich optical spectrum acquired with the Magellan telescope allows the object to be classified as an A0 auroral phase nova, and the soft X-ray spectrum indicates that the nova was in a super-soft source state in the X-ray decline seen in the follow-up X-ray observations. The archival ASAS data suggests that the nova at onset (Oct 2005) was a “very fast” nova, and an estimate of its distance is consistent with the nova being situated within the LMC.
Conclusions. With the discovery presented here of a new classical nova in the LMC, it is clear that XMM-Newton slew data are continuing to offer a powerful opportunity to find new X-ray transient objects.
Key words: stars: novae, cataclysmic variables / stars: individual: XMMSL1 J060636.2-694933 / surveys / X-rays: general
© ESO, 2009