First ever serendipitous discovery of bright source at hard X-rays

Spitzer-IRAC imaging of Circinus ULX5. Left image shows wide-field IRAC 8 μm (channel 4) image of Circinus with the red circle showing the NuSTAR position of ULX5 (Credit: D. J. WALTON et al.)
Spitzer-IRAC imaging of Circinus ULX5. Left image shows wide-field IRAC 8 μm (channel 4) image of Circinus with the red circle showing the NuSTAR position of ULX5 (Credit: D. J. WALTON et al.)

Main Point:

Scientists have serendipitously found an ultraluminated X-ray source (ULX) in the immediate surroundings of the Circinus galaxy.

Published in:

[sociallocker]
arXiv (accepted for publication in ApJ)

Study Further:

Circinus galaxy:

Circinus galaxy (ESO 97-G13) is present in Circinus constellation and is one of the nearest galaxies to our Milky Way with a distance of about 13 million light-years from us.

Circinus galaxy has a numerous rings of gases with the outermost ring at a distance of about 700 light-years from the center of the galaxy and the inner ring at a distance of about 130 light-years out.

Kiloelectronvolt (keV):

It is a unit of energy equal to the energy gained by an electron accelerated through a potential difference of one volt and equal to 1.602 x 10–19 joule.

Present Research:

In the present research, astronomers utilized coordinated observations from XMM-Newton and NuSTAR observatory and serendipitously found the bright light source, which they called as Circinus ULX5. This source is found to be at hard (E>10 keV) X-rays.

Scientists are of the opinion of a black hole mass of about 90 solar masses for Circinus ULX5. They are of the opinion that less attention to the source is probably due to its larger distance from the center of the nucleus.

For further information, you may visit the paper present in the reference.

Reference:

D. J. Walton, F. Fuerst, F. A. Harrison, D. Stern, M. Bachetti, D. Barret, F. E. Bauer, S. E. Boggs, F. E. Christensen, W. W. Craig, A. C. Fabian, B. W. Grefenstette, C. J. Hailey, K. K. Madsen, J. M. Miller, A. Ptak, V. Rana, N. A. Webb, & W. W. Zhang (2013). An Extremely Luminous and Variable Ultraluminous X-ray Source in the Outskirts of Circinus Observed with NuSTAR arXiv arXiv: 1310.2633v1[/sociallocker]

Usman Zafar Paracha

Usman Zafar Paracha is a sort of entrepreneur. He is the author of "Color Atlas of Statistics", and the owner of an Android game "Faily Rocket."