By now many Canadians know that February is heart month, thanks to annual canvassing of the Heart and Stroke Foundation of Canada. February, it turns out, is the peak month for heart attacks, but did you ever wonder why? If you subscribe to the notion that high cholesterol is the main or major risk factor for heart attacks, then you would be surprised to know that seasonal differences in choles...

We study the hydrodynamical evolution of galactic winds in disky dwarf galaxies moving through an intergalactic medium. In agreement with previous investigations, we find that when the ram pressure stripping does not disrupt the ISM, it usually has a negligible effect on the galactic wind dynamics. Only when the IGM ram pressure is comparable to the central ISM thermal pressure the stripping an...

We present results from two Chandra/ACIS-I observations and one XMM-Newton observation of X-ray emission from the interstellar medium (ISM) and the inner radio lobes of the nearby radio galaxy Centaurus A. The ISM has an average radial surface brightness profile that is well described by a -model profile with index 1⁄4 0:40 0:04 and a temperature of kBTISM 0:29 keV beyond 2 kpc from the nucleus...

The response of the Indian summer monsoon (ISM) circulation and precipitation to Middle East dust aerosols on sub-seasonal timescales is studied using observations and the Weather Research and Forecasting model coupled with online chemistry (WRF-Chem). Satellite data show that the ISM rainfall in coastal southwest India, central and northern India, and Pakistan is closely associated with the Mi...

We reexamine the spectroscopic underpinnings of recent suggestions that [O I] and [Fe II] lines from the Orion H II region are produced in gas where the iron-carrying grains have been destroyed and the electron density is surprisingly high. Our new observations show that previous detections of [O I] 5577 were dominated by telluric emission. Our limits are consistent with a moderate density (≈ 1...

This thesis work is aiming for detecting and localizing different classes of objects in natural images. For this, we use an algorithm that first detects objects using Implicit Shape model (ISM), then, with patch based class segmentation, verifies the hypothesis. This algorithm is able to achieve a high detection rate on both rigid and articulated objects. The thesis also proposes a novel multi-...

As the closest radio galaxy, Centaurus A is a powerful laboratory for the X-ray study of radio-emitting structures and their interactions with the hot interstellar medium (ISM). This paper details our interpretation of the remarkable X-ray enhancement which caps the inner southwest radio lobe, at a radius of about 6 kpc from the galaxy center. The shell of X-rayemitting gas is hotter than the a...