Friday, April 17, 2009

Interesting Astrophysics: Apr 13 to Apr 17

A lot of interesting galaxy-related stuff came out this week, either in the journals or on astro-ph. Of particular note there is a new radio supernova in M82 (Brunthaler et al), two papers on IR observations of star-forming galaxies (Siana et al; Weedmand and Houck) and even a paper on post-starburst galaxies (Wild et al). Everett et al expand on their work on hybrid Cosmic Ray plus Thermal galactic winds, and Maddox et al look at the X-ray emission from the N11 superbubble in the LMC.

Galaxies and Starbursts

Discovery of a bright radio transient in M82: a new radio supernova?
A. Brunthaler, K.M. Menten, M.J. Reid, C. Henkel, G.C. Bower, H. Falcke, arXiv:0904.2388 [ps, pdf, other]
Comments: submitted to Astronomy & Astrophysics, 4 pages, 3 figures, also available at this http URL

This is pretty cool - a new bright radio source has appeared near the kinematic center of M82, possibly a radio supernova.

Post-starburst galaxies: more than just an interesting curiosity

Vivienne Wild, C. Jakob Walcher, Peter H. Johansson, Laurence Tresse, Stéphane Charlot, Agnieszka Pollo, Olivier Le Fèvre and Loic de Ravel, 2009, MNRAS, 395, 144
Full Text: HTML, PDF (Size: 1562K)

Detection of PAH and Far-Infrared Emission from the Cosmic Eye: Probing the Dust and Star Formation of Lyman Break Galaxies
Brian Siana, Ian Smail, A. Mark Swinbank, Johan Richard, Harry I. Teplitz, Kristen E. K. Coppin, Richard S. Ellis, Daniel P. Stark, Jean-Paul Kneib, Alistair C. Edge, arXiv:0904.1742 [ps, pdf, other]
Comments: Accepted for publication in ApJ. 9 pages, 7 figures

Evolution of the Most Luminous Dusty Galaxies
Daniel W. Weedman, James R. Houck, arXiv:0904.2331 [ps, pdf, other]
Comments: Accepted for publication in The Astrophysical Journal

Spitzer IRS observations for a significant number of ULIRGs, tabulates the 8 micron fluxes.

Synchrotron Constraints on a Hybrid Cosmic-Ray and Thermally-Driven Galactic Wind
John E. Everett, Quintin G. Schiller, Ellen G. Zweibel, arXiv:0904.1964 [ps, pdf, other]
Comments: 13 pages, 8 figures; submitted to ApJ; comments and questions welcome

Hitting the Bull's-eye: The Radial Profile of Accretion and Star Formation in the Milky Way
J. E. G. Peek, arXiv:0904.2000 [pdf, other]
Comments: 9 pages, 5 figures, accepted to the ApJ

Understanding Global Galactic Star Formation
Paul A. Scowen. et al, arXiv:0904.2002 [pdf]
Comments: 8 pages - Science White Paper for the Astro2010 Decadal Survey Panel(s): Planetary Systems and Star Formation; Stars and Stellar Evolution

The evolution of the mass-metallicity relation in galaxies of different morphological types
F. Calura, A. Pipino, C. Chiappini, F. Matteucci, R. Maiolino, arXiv:0904.2180 [ps, pdf, other]
Comments: 20 pages, 13 figures, accepted by Astronomy & Astrophysics

Reproduces galaxy mass-metallicity (MZ) relationship using increasing SF efficiency in more massive galaxies, without the need for outflows. This is hardly surprising, as even outflow advocates acknowledge that most/much of the MZ relationship is driven by the different amount of gas consumption and thus relative degree of chemical evolution of host galaxies of different mass. Unfortunately Calura et al don't show what the galaxy mass versus effective yield (M-yeff) relationship predicted by their model, which is annoying as the M-yeff would take this effect out and observationally still shows apparent metal loss in low mass galaxies (although c.f. Dalcanton '07, who showed yeff is not always an honest tracer).


Big Bang Nucleosynthesis: The Strong Force meets the Weak Anthropic Principle
J. MacDonald, D. J. Mullan, arXiv:0904.1807 [ps, pdf, other]
Comments: 13 figures

Numerical Methods and Numerical Astrophysics

PCA Tomography: how to extract information from data cubes
J. E. Steiner, R. B. Menezes, T. V. Ricci and A. S. Oliveira, 2009, MNRAS, 395, 64
Full Text: HTML, PDF (Size: 20939K)

The Fate of High-Velocity Clouds: Warm or Cold Cosmic Rain?
Fabian Heitsch, Mary E. Putman, arXiv:0904.1995 [ps, pdf, other]
Comments: 12 pages, 8 figures, accepted by ApJ

Stars, Supernovae and Planets

Nonthermal X-ray Emission from the N11 Superbubble in the Large Magellanic Cloud
L.A. Maddox, R.M. Williams, B.C. Dunne, Y.-H Chu, arXiv:0904.1821 [ps, pdf, other]
Comments: 16 pages, 3 figures, submitted to ApJ

Short-term Effects of Gamma Ray Bursts on Earth
Osmel Martín, Douglas Galante, Rolando Cárdenas, J.E. Horvath, arXiv:0904.1755 [pdf]
Comments: 13 pp., to appear in Astrophysics and Space Science

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