Molecular gas in the galaxy M83 : Its distribution, kinematics, and relation to star formation

The barred spiral galaxy M83 (NGC5236) has been observed in the 12CO J=1–0 and J=2–1 millimetre lines with the Swedish-ESO Submillimetre Telescope (SEST). The sizes of the CO maps are 100×100, and they cover the entire optical disk. The CO emission is strongly peaked toward the nucleus. The molecular spiral arms are clearly resolved and can be traced for about 360º. The total molecular gas mass is comparable to the total Hi mass, but H2 dominates in the optical disk. Iso-velocity maps show the signature of an inclined, rotating disk, but also the effects of streaming motions along the spiral arms. The dynamical mass is determined and compared to the gas mass. The pattern speed is determined from the residual velocity pattern, and the locations of various resonances are discussed. The molecular gas velocity dispersion is determined, and a trend of decreasing dispersion with increasing galactocentric radius is found. A total gas (H2+Hi+He) mass surface density map is presented, and compared to the critical density for star formation of an isothermal gaseous disk. The star formation rate (SFR) in the disk is estimated using data from various star formation tracers. The different SFR estimates agree well when corrections for extinctions, based on the total gas mass map, are made. The radial SFR distribution shows features that can be associated with kinematic resonances. We also find an increased star formation efficiency in the spiral arms. Different Schmidt laws are fitted to the data. The star formation properties of the nuclear region, based on high angular resolution HST data, are also discussed.

The Vulnerable Animals That Therefore We Are : (Non-)Human Animals in D.H. Lawrence's Women in Love

Central to animal studies is the question of words and how they are used in relation to wordless beings such as non-human animals. This issue is addressed by the writer D.H. Lawrence, and the focus of this thesis is the linguistic vulnerability of humans and non-humans in his novel Women in Love, a subject that will be explored with the help of the philosopher Jacques Derrida’s text The Animal That Therefore I Am. The argument is that Women in Love illustrates the human subjection to and constitution in language, which both enables human thinking and restricts the human ability to think without words. This linguistic vulnerability causes a similar vulnerability in non-human animals in two ways. First, humans tend to imagine others, including non-verbal animals, through words, a medium they exist outside of and therefore cannot be defined through. Second, humans are often unperceptive of non-linguistic means of expression and they therefore do not discern what non-human animals may be trying to communicate to them, which often enables humans to justify abuse against non-humans. In addition, the novel shows how this shared but unequal vulnerability can sometimes be dissolved through the likewise shared but equal physical vulnerability of all animals if a human is able to imagine the experiences of a non-human animal through their shared embodiment rather than through human language. Hence the essay shows the importance of recognizing the limitations of language and of being aware of how the symbolizing effect of words influences the human treatment of its others.