News – Page 4 – Kayhan Gultekin

Against a black background, a red-orange ring with an unmistakeable dark center. The ring is asymmetrically brighter on the bottom half than the top.

Shadow on the sky

I congratulate my Event Horizon Telescope colleagues on an amazing achievement. What an amazing image of the shadow of the black hole in M87. The only way that the shadow in M87 could have been resolved by EHT is if we were right in our mass determination in Gebhardt et al. (2011). Our stellar dynamical […]

picture of woman in turquoise shirt with gray background

Prof. Runnoe!

Congratulations to Jessie Runnoe on accepting a tenure-track job at Vanderbilt University!

Figure showing log of flux density in Jy as a function of log of frequency in MHz. The y-axis ranges from -4 to 1. The x-axis ranges from 3.0 to 4.75. The data from x = 3.0 to 3.505 are flat at about y = 0. The data from x = 3.505 to 4.6 are going down. The legend indicates that the source is IC 1459, that the low-frequency spectral index is -0.08 +/- 0.08, the high-frequency spectral index is 0.73 +/- 0.01, and the log of the turnover frequency is 3.55 +/- 0.022.

Turnover

Gültekin group alum Erica Hammerstein just had a paper accepted to ApJ and no up on arXiv. Check it out on the Turnover Frequency Research Page!

Graph with x-axis labeled 1.09 log(L_R / 10^38 erg / s) -0.59 log(L_X / 10^40 erg / s) and y-axis labeled log(M/M_solar). There is a legend in the top left indicated that red circles are AGN, red X's are Seyferts, blue squares are L/H XRBs, and blue triangles are I/HS XRBs. There are a large number of partially transparent filled shapes overplotted on each other with opaque unfilled symbols plotted on top. On the upper right are red circles, some with Xs in them. In the bottom left, are blue squares and triangles. A grey line with grey shaded region around it goes through most of the points.

It’s all about the fundamentals

It has been a long slog, but our Fundamental Plane of Black Hole Accretion paper has finally been published. Read about it at the Fundamental Plane Research Project page. Also, make sure to check out the interactive 3D visualization.

I am now a NANOGrav associate member!

I am delighted to announce that I am now an associate member of the NANOGrav collaboration! As they say on their webpage, “NANOGrav (the North American Nanohertz Observatory for Gravitational Waves) is a collaboration of scientists in the United States and Canada working to detect low-frequency gravitational waves and characterize the low-frequency universe in order to […]

Picture of a crowded field of stars some red, some blue of varying brightness

Welcome to the new page

The new page is now up and running. Actually, it has been up and running for a while, but I haven’t been able to Once I have enough content to keep the News page from looking naked, I’ll delete the old posts. You can ignore them for now.

Newer