James R. Herrnstein

X-ray Luminosity and Absorption Column Fluctuations in the H2O Maser Galaxy NGC 4258 from Weeks to Years (2005)

Fruscione, Antonella, Greenhill, Lincoln J., Filippenko, Alexei V., Moran, James M., Herrnstein, James R., Galle, Elizabeth

We report monitoring of the 0.3-10 keV spectrum of NGC4258 with XMM over 1.5 years.We als o report reprocessing of an overlapping series of archival Chandra observations. By including earlier ASCA...

A Binary Millisecond Pulsar in Globular Cluster NGC6544 (2000)

Ransom, Scott M., Greenhill, Lincoln J., Herrnstein, James R., Manchester, Richard N., Camilo, Fernando, Eikenberry, Stephen S., ...

We report the detection of a new 3.06 ms binary pulsar in the globular cluster NGC6544 using a Fourier-domain ``acceleration'' search. With an implied companion mass of ~0.01 solar masses and an...