Friday, October 02, 2009

Interesting Astrophysics: Sep 28 to Oct 02

A mixed bag of preprints this week. From my personal perspective I'd say the Marchili et al paper on M82' SN2008iz and Acero et al's paper on a gamma ray detection of NGC 253 are the most interesting.

Galaxies and Starbursts

The radio lightcurve of SN 2008iz in M82 revealed by Urumqi observations
N. Marchili, I. Marti-Vidal, A. Brunthaler, T.P. Krichbaum, P. Mueller, X. Liu, H.-G. Song, U. Bach, R. Beswick, J.A. Zensus, arXiv:0909.5535 [ps, pdf, other]
Comments: 7 pages, 3 figures. Accepted for publication in A & A

Detection of Gamma Rays From a Starburst Galaxy
The HESS Collaboration: F. Acero, et al, arXiv:0909.4651 [ps, pdf, other]
Comments: 24 pages, 8 figures, published in Science Express, see: this http URL

Reported H.E.S.S. gamma ray detection of NGC 253, F()>220 GeV) = [5.5 +/- 1.0(stat) +/- 2.8 (sys)] times 10-13 cm-2 s-1. Much of the interpretation is done under the assumption that all the activity is due to the starburst, and NOT related to any AGN, which I'm not personally sure is a robust assumption. Still its an interesting mini-paper.

Star Formation Histories within the Antennae Galaxies (Arp 244)
Hong-Xin Zhang, Yu Gao, Xu Kong, arXiv:0909.5186 [ps, pdf, other]
Comments: 13 pages, 7 figures, accepted by MNRAS

How ubiquitous are massive starbursts in interacting galaxies?
P. Di Matteo, F. Bournaud, M. Martig, F. Combes, A.-L. Melchior, B. Semelin, arXiv:0909.5192 [ps, pdf, other]
Comments: 4 pages, Proceedings of the conference "Galaxies in isolation: exploring Nature vs Nurture" (May 2009, Granada, Spain)

Comparison of H-alpha and UV Star Formation Rates in the Local Volume: Systematic Discrepancies for Dwarf Galaxies
Janice C. Lee, Armando Gil de Paz, Christy Tremonti, Robert C. Kennicutt Jr., Samir Salim, Matthew Bothwell, Daniela Calzetti, Julianne Dalcanton, Daniel Dale, Chad Engelbracht, Jose G. Funes S.J., Benjamin Johnson, Shoko Sakai, Evan Skillman, Liese van Zee, Fabian Walter, Daniel Weisz, arXiv:0909.5205 [ps, pdf, other]
Comments: 29 pages, 10 figures, 2 tables, accepted for publication in ApJ

The Far-Infrared--Radio Correlation at High Redshifts: Physical Considerations and Prospects for the Square Kilometer Array
Eric J. Murphy, arXiv:0910.0011 [ps, pdf, other]
Comments: 16 pages, 8 figures, accepted for publication in ApJ

What stellar populations can tell us about the evolution of the mass-metallicity relation in SDSS galaxies
N. Vale Asari, G. Stasinska, R. Cid Fernandes, J. M. Gomes, M. Schlickmann, A. Mateus, W. Schoenell, arXiv:0910.0224 [ps, pdf, other]
Comments: To appear in the proceedings of IAU symposium 262, 'Stellar Populations - Planning for the Next Decade'

From their abstract: "Our results suggest that the M-Z relation for galaxies with present-day stellar masses down to 10^10 solar masses is mainly driven by the star formation history and not by inflows or outflows." This strikes me as a bit odd for a major conclusion, as pretty much everyone agrees that M-Z is dominated by the SF history... the real argument if M-yeff, and the trends suggestive of outflow really kick in for galaxies *below* 10^10.5 solar masses.

Theoretical Cosmology

Can galaxy outflows and re-accretion produce the downsizing in specific star formation rate of late-type galaxies?

C. Firmani, V. Avila-Reese, A. Rodriguez-Puebla, arXiv:0909.5188 [ps, pdf, other]
Comments: 11 pages, 4 figures. Comments are welcome. Submitted to MNRAS

The physics driving the cosmic star formation history
Joop Schaye, Claudio Dalla Vecchia, C. M. Booth, Robert P. C. Wiersma, Tom Theuns, Marcel R. Haas, Serena Bertone, Alan R. Duffy, I. G. McCarthy, Freeke van de Voort, arXiv:0909.5196 [ps, pdf, other]
Comments: Submitted to MNRAS, 27 pages and 18 figures

Numerical Astrophysics

A new radiative cooling curve based on an up to date plasma emission code
K.M. Schure, D. Kosenko, J.S. Kaastra, R. Keppens, J. Vink, arXiv:0909.5204 [ps, pdf, other]
Comments: 11 pages, 6 figures. Accepted for publication in A&A. Tables in text format online available at this http URL

Collisional ionisation equilibrium cooling, valid above 104 K.. Seems pretty straightforward.

Numerical Implementation of Streaming Down the Gradient: Application to Fluid Modeling of Cosmic Rays
Prateek Sharma, Phillip Colella, Daniel F. Martin, arXiv:0909.5426 [ps, pdf, other]
Comments: submitted to SIAM J. of Scient. Comp.; 15 pages, 9 figs.; comments welcome

Stars, Supernovae and Planets

Stellar models: firm evidence, open questions and future developments
Santi Cassisi, arXiv:0909.4629 [ps, pdf, other]
Comments: 10 pages, 3 figures, Keynote review talk at the IAU Symp. 262 "Stellar Populations - Planning the Next Decade" of the XXVIIth IAU General Assembly held in Rio de Janeiro (Brazil), Proceeding eds. G. Bruzual & S. Charlot

Chandra observation of Cepheus A: The diffuse emission of HH 168 resolved
P. C. Schneider, H. M. Guenther, J. H. M. M. Schmitt, arXiv:0909.5326 [ps, pdf, other]
Comments: 8 pages, 5 figures, accepted for publication in A&A

Core collapse supernovae and starbursts
Miguel A. Perez-Torres, arXiv:0909.5578 [ps, pdf, other]
Comments: Proceedings of the 8th international e-VLBI Workshop, accepted for publication, 6 pages, 1 figure,

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