Interesting Astrophysics: Jun 22 - Jun 30

The following set of astrophysical preprints from arXiv attracted my attention in the last week. Beyond the usual predominance of galaxy-related papers (in particular detection of molecular P-Cygni profiles in Arp 220's core) there are a number of interesting star/star cluster related papers (in particular Krumholz & Matzner; Allison et al; van Loon).

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Galaxies and Starbursts

Star Formation Rates for Starburst Galaxies from Ultraviolet, Infrared, and Radio Luminosities
Authors: Lusine A. Sargsyan, Daniel W. Weedman, arXiv:0906.3688 [ps, pdf, other]
Comments: Accepted for publication in The Astrophysical Journal

Origin and Dynamical Support of Ionized Gas in Galaxy Bulges
Authors: Luis C. Ho, arXiv:0906.4103 [ps, pdf, other]
Comments: To appear in ApJ, 11 pages, 6 figures

P-Cygni Profiles of Molecular Lines toward Arp 220 Nuclei
Authors: Kazushi Sakamoto, Susanne Aalto, David J. Wilner, John H. Black, John E. Conway, Francesco Costagliola, Alison B. Peck, Marco Spaans, Junzhi Wang, Martina C. Wiedner, arXiv:0906.5197 [ps, pdf, other]
Comments: ApJL in press, 6 pages

Quest for truly isolated galaxies
Authors: Noah Brosch, arXiv:0906.4212 [ps, pdf, other]
Comments: Contribution for the "Galaxies in Isolation" conference

Evolution of the X-ray Luminosity in Young HII Galaxies
Authors: D. Rosa González, E. Terlevich, E. Jiménez Bailón, R. Terlevich, P. Ranalli, A. Comastri, E. Laird, K. Nandra, arXiv:0906.4461 [ps, pdf, other]
Comments: Accepted by MNRAS

The Discovery of a Large Lyman-alpha+HeII Nebula at z~1.67: A Candidate Low Metallicity Region?
Authors: M. K. M. Prescott, A. Dey, B. T. Jannuzi, arXiv:0906.4785 [ps, pdf, other]
Comments: Accepted for publication in ApJ; emulateapj format, 17 pages, 7 figures, 3 tables

An Ultraviolet Study of Star-Forming Regions in M31
Authors: Yongbeom Kang, Luciana Bianchi, Soo-Chang Rey, arXiv:0906.4839 [ps, pdf, other]
Comments: 39 pages, 14 figures, accepted for publication in ApJ

From their abstract: "When star formation detected from IR measurements of the heated dust is added to the UV-measured star formation (from the unobscured populations) in the recent few Myrs, we find the SFR has slightly decreased in recent epochs, with a possible peak between 10 and 100 Myrs, and an average value of SFR ~ 0.6 or 0.7 M_{sun} yr^{-1} (for metallicity Z=0.02 or 0.05 respectively) over the last 400 Myrs."

The Cosmic Web of Baryons
Authors: Joel N. Bregman, arXiv:0906.4984 [pdf]
Comments: Submitted as a science white paper to the Decadal Survey (Astro2010). In pdf format only. 7 pages

The Missing Baryons in the Milky Way and Local Group
Authors: Joel N. Bregman, arXiv:0906.4993 [pdf]
Comments: A White Paper submitted to The Galactic Neighborhood Science Frontiers Panel of Astro2010 (Decadal Survey). 7 pages in pdf format only

Faint Lyman-Break galaxies as a crucial test for galaxy formation models
Authors: Barbara Lo Faro, Pierluigi Monaco, Eros Vanzella, Fabio Fontanot, Laura Silva, Stefano Cristiani, arXiv:0906.4998 [ps, pdf, other]
Comments: 17 pages, 13 figures, 1 table; accepted for publication by MNRAS

A Physical Model of Lyman Alpha Emitters
Authors: Vithal Tilvi, Sangeeta Malhotra, James E. Rhoads, Evan Scannapieco, Robert J. Thacker, Ilian T. Iliev, Garrelt Mellema, arXiv:0906.5159 [ps, pdf, other]
Comments: 9 pages, 6 figures, Comments welcome

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The Interstellar Medium

The Dynamics of Radiation Pressure-Dominated HII Regions
Authors: Mark R. Krumholz, Christopher D. Matzner, arXiv:0906.4343 [ps, pdf, other]
Comments: 10 pages, 2 figures, emulateapj format, submitted to ApJ

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Stars

Dynamical mass segregation on a very short timescale
Authors: R. J. Allison, S. P. Goodwin, R. J. Parker, R. de Grijs, S. F. Portegies Zwart, M. B. N. Kouwenhoven, arXiv:0906.4806 [ps, pdf, other]
Comments: ApJ Letter, accepted

The effects of red supergiant mass loss on supernova ejecta and the circumburst medium
Authors: Jacco Th. van Loon, arXiv:0906.4855 [ps, pdf, other]
Comments: Invited review, in "Hot and Cool: Bridging Gaps in Massive Star Evolution", Pasadena (USA), November 2008. ASP Conference Series, 10 pages

A Possible Supernova Remnant high above the Galactic Disk
Authors: David B. Henley, Robin L. Shelton, arXiv:0906.4937 [ps, pdf, other]
Comments: 16 pages, 11 figures. Accepted for publication in the Astrophysical Journal

Hard X-ray flux from low-mass stars in the Cygnus OB2 Association
Authors: M. Caramazza, J.J. Drake, G. Micela, E. Flaccomio, arXiv:0906.5222 [ps, pdf, other]
Comments: 5 pages

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Numerical and Statistical Methods

Fisher Matrices and Confidence Ellipses: A Quick-Start Guide and Software
Authors: Dan Coe, arXiv:0906.4123 [pdf, other]

Comments: 4 pages, 1 figure, not submitted to any journal. Comments welcome. Software will be made available at this http URL