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211 papers · 1 filter
Optical photometric and polarimetric investigation of NGC 1931
A. K. Pandey, C. Eswaraiah, Saurabh Sharma +7
We present optical photometric and polarimetric observations of stars towards NGC 1931 with the aim to derive the cluster parameters such as distance, reddening, age and luminosity…
Optical and Near-infrared survey of the stellar contents associated with the star-forming Complex Sh2-252
Jessy Jose, A. K. Pandey, K. Ogura +8
We present the analyses of the stellar contents associated with the HII region Sh2-252 using UBVRI photometry, slit and slitless spectroscopy along with the NIR data from 2MASS for…
Diffuse light in the young cluster of galaxies CL J1449+0856 at z=2.07
C. Adami, F. Durret, L. Guennou +1
Cluster properties do not seem to be changing significantly during their mature evolution phase, for example they do not seem to show strong dynamical evolution at least up to z~0.…
Helium in natal HII regions: the origin of the X-ray absorption in gamma-ray burst afterglows
Darach Watson, Tayyaba Zafar, Anja C. Andersen +8
Soft X-ray absorption in excess of Galactic is observed in the afterglows of most gamma-ray bursts (GRBs), but the correct solution to its origin has not been arrived at after more…
The X-ray-Optical Relations for Nine Clusters at z = 0.7-1.1
Nick Rumbaugh, Dale D. Kocevski, Roy R. Gal +4
We use Chandra observations of nine optically and X-ray selected clusters in five different structures at z ~ 0.7-1.1 from the Observations of Redshift Evolution in Large-Scale Env…
Distant galaxy clusters in the XMM Large Scale Structure survey
J. P. Willis, N. Clerc, M. N. Bremer +12
(Abridged) Distant galaxy clusters provide important tests of the growth of large scale structure in addition to highlighting the process of galaxy evolution in a consistently defi…