X7: An Extended Evolving Object Near the Galactic Center
Abstract
X7 is a filamentary feature ~1.2" from SgrA*, suggested to be bow-shocked from an external wind source, possibly SgrA*. New analysis of Keck LGSAO data acquired with the integral field spectrometer OSIRIS over the last 14 years of emission features in the near infrared show how it's motion and velocity evolves with time . X7 is also detected in the thermal IR L-band images from NIRC2 , the imager used on the Keck II LGSAO system. We present measurements of the proper motion, radial velocity, and morphology changes over a 14 year time span. We also will discuss the fit to an orbit based on the assumption it is in orbit around the SMBH. The OSIRIS emission line spacio-velocity structure show morphology changes in the tail of X7 with no comet-like feature that is evident in the L-band dust continuum images. X7 has strong emission features and no continuum in wavelengths short of 2 μm and high proper motion with significant radial acceleration, comparable, although likely different than the compact G-objects (Ciurlo+ 2020).
- Publication:
-
43rd COSPAR Scientific Assembly. Held 28 January - 4 February
- Pub Date:
- January 2021
- Bibcode:
- 2021cosp...43E1249C