As part of the Virgo Cluster Survey Tracing Ionised Gas Emission, a blind narrow-band H ? +[NII] imaging survey cluster carried out with MegaCam at CFHT, we discovered eight massive (10 10 ? M star 11 ? ) lenticular galaxies prominent ionised gas emission features in their inner (a few kiloparsec) regions. These are either filaments similar to those observed cooling flows (two galaxies), or the...

Context. This work is conducted as part of the “SPECPDR” program dedicated to the study of very small particles and chemistry in photodissociation regions with the Spitzer Space Telescope (SST). Aims. We study the evolution of the Aromatic Infrared Bands (AIBs) emitters across the illuminated edge of the Horsehead nebula and especially their survival and properties in the HII region. Methods. W...

A plasma is an ionised gas in which the nearest neighbour interactions between the electrically-charged constituents (negatively-charged electrons and positivelycharged ions, which are in equal numbers so as to maintain overall electrical neutrality) is dominated by the long-range interactions of many ‘distant’ particles. In fact, many plasmas contain a significant number of unionised neutral a...

We present post-outburst (∼ 100 days after outburst) radio continuum observation of the region (∼ 30 ×30) around McNeil’s nebula (V1647 Orionis). The observations were carried out using the Giant Metrewave Radio Telescope (GMRT), India, at 1272 MHz on 2004 Feb 14.5 UT. Although 8 sources have been detected within a circular diameter of 25 centred on V1647 Ori, we did not detect any radio contin...

The X-ray spectra of many active galactic nuclei (AGN) exhibit a ‘soft excess’ below 1 keV, whose physical origin remains unclear. Diverse models have been suggested to account for it, including ionised reflection of X-rays from the inner part of the accretion disc, ionised winds/absorbers, and Comptonisation. The ionised reflection model suggests a natural link between the prominence of the so...

We have carried out an archival radio, optical and infrared wavelength imaging survey of 44 Bright-Rimmed Clouds (BRCs) using the NRAO/VLA Sky Survey (NVSS) archive, images from the Digitised Sky Survey (DSS) and the Midcourse Space eXperiment (MSX). The data characterise the physical properties of the Ionised Boundary Layer (IBL) of the BRCs. We have classified the radio detections as: that as...