On the newly discovered 3.4 hour modulated X-ray source (RXJ1940.1-1025) near NGC 6814
Abstract
We confirm the report by Madejski et al. that the X-ray flux of the newly discovered ROSAT source (RXJ1940.1-1025), 37 arc min away from NGC 6814, is periodically modulated at 3.4 hours. This source is in fact responsible for the modulation earlier attributed to the X-ray flux from the Seyfert galaxy NGC 6814. The source was optically identified with a blue emission line object of V=~16mag. The optical spectrum resembles that of a magnetic CV. The X-ray spectrum shows two distinct components: a soft black body component with kT_BB_=70eV and a hard power law component with a photon index of 1.1. We suggest that the object is either an AM Her or an intermediate polar (IP). A series of optical spectroscopic observations have established a sinusoidal radial velocity curve from the Hα emission line with a period of 12120+/-3s (90%) and half amplitude +/-165km/s.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- August 1994
- Bibcode:
- 1994A&A...288..513S
- Keywords:
-
- CATACLYSMIC VARIABLES;
- STARS: INDIVIDUAL: RXJ1940.1-1025;
- X-RAYS: STARS;
- GALAXIES: SEYFERT;
- GALAXIES: INDIVIDUAL: NGC 6814