Search for Optical Pulsation in M82 X-2
Abstract
We report on a search for optical pulsation from M82 X-2 over a range of periods. M82 X-2 is an X-ray pulsar with a 1.37s average spin period and a 2.5 day sinusoidal modulation. The observations were done with the ARray Camera for Optical to Near-IR Spectrophotometry at the 200 inch Hale telescope at the Palomar Observatory. We performed H test and χ 2 statistical analysis. No significant optical pulsations were found in the wavelength range of 3000-11000 Å with a pulsation period between 1.36262 and 1.37462 s. We found an upper limit on pulsed emission in the 4000-8000 Å wavelength range to be fainter than ∼20.5 mag AB , corresponding to ∼23 μJy.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 2017
- DOI:
- 10.3847/1538-4357/aa93d8
- Bibcode:
- 2017ApJ...850...65C
- Keywords:
-
- pulsars: general;
- pulsars: individual: M82 X-2;
- stars: neutron