Beecroft Institute for Particle Astrophysics and Cosmology

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Towards simulating star formation in the interstellar medium

(2004)

Authors:

A Slyz, J Devriendt, Greg Bryan, Joseph Silk
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Constraints on isocurvature models from the WMAP first-year data

Physical Review D 70 (2004) 103520 20pp

Authors:

P Ferreira, Bucher, M, Dunkley, J, Moodley, K
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Determining Foreground Contamination in Cosmic Microwave Background Observations: Diffuse Galactic Emission in the MAXIMA-I Field

The Astrophysical Journal American Astronomical Society 615:1 (2004) 55-62

Authors:

AH Jaffe, A Balbi, JR Bond, J Borrill, PG Ferreira, D Finkbeiner, S Hanany, AT Lee, B Rabii, PL Richards, GF Smoot, R Stompor, CD Winant, JHP Wu
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Molecular abundance ratios as a tracer of accelerated collapse in regions of high mass star formation?

ArXiv astro-ph/0410653 (2004)

Authors:

CJ Lintott, S Viti, JMC Rawlings, DA Williams, TW Hartquist, P Caselli, I Zinchenko, P Myers

Abstract:

Recent observations suggest that the behaviour of tracer species such as N_2H+ and CS is significantly different in regions of high and low mass star formation. In the latter, N_2H+ is a good tracer of mass, while CS is not. Observations show the reverse to be true in high-mass star formation regions. We use a computational chemical model to show that the abundances of these and other species may be significantly altered by a period of accelerated collapse in high mass star forming regions. We suggest these results provide a potential explanation of the observations, and make predictions for the behaviour of other species.
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Possible evidence for MeV dark matter in dwarf spheroidals.

Phys Rev Lett 93:16 (2004) 161302

Authors:

Dan Hooper, Francesc Ferrer, Céline Boehm, Joseph Silk, Jacques Paul, N Wyn Evans, Michel Casse

Abstract:

The observed 511 keV emission from the galactic bulge could be due to very light (MeV) annihilating dark matter particles. To distinguish this hypothesis from conventional astrophysical sources, we study dwarf spheroidals in the region observed by the International Gamma-Ray Astrophysics Laboratory/SPI such as Sagittarius. As these galaxies have comparatively few stars, the prospects for 511 keV emission from standard astrophysical scenarios are minimal. The dwarf spheroidals do, however, contain copious amounts of dark matter. The observation of 511 keV emission from Sagittarius should be a "smoking gun" for MeV dark matter.
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