Embedded Files
The temperature of the cool CGM is estimated from the velocity width of OVI absorption lines. Recently, some OVI lines were discovered showing unusually high velocity width. Does this "broad OVI" come from a hotter gas? We test this using 1.2 Ms Chandra data and detect OVII absorption in the same sky direction, and at a similar redshift of the "broad OVI" at >99.9% confidence, making it the first detection of hot CGM in X-ray absorption around an external galaxy. (Mathur, Das, et al. 2023, MNRASL, 525, L11) [Figure: The redshifted OVII absorption in the normalized spectrum]Β
Simulated XMM-Newton and Athena spectra to probe the warm-hot CGM of an external galaxy in X-ray absorption, based on the ~2Ο detection of OVII in the Chandra grating data. Instead of the blind search for redshifted OVII lines, this detection is anchored at the already known redshift of a broad OVI absroption line detected in UV toward the same direction. (Mathur, Gupta, Das et al. 2021, ApJ, 908, 69)
Cover image: Chandra NewsΒ
Page updated
Google Sites
Report abuse