Thursday, December 31, 2009

Interesting Astrophysics: Dec 21 to Dec 31, 2009

The final edition of Interesting Astrophysics for 2009 is as diverse as ever. Of particular note, a classic superwind in the "8 o'clock arc" at z~2.7 (Dessauges-Zavadsky et al), a sample of galaxy groups analogous to our own Local Group (Marino et al), stellar wind mass loss rates in hot stars (Lucy et al), and astrobiology (Cirkovic et al).


Galaxies and Starbursts

Galaxy Evolution in Local Group Analogs. I. A GALEX study of nearby groups
A. Marino, L. Bianchi, R. Rampazzo, L.M. Buson, D. Bettoni, arXiv:0912.4266 [ps, pdf, other]
Comments: 20 pages, 13 figures, accepted for publication in Astronomy and Astrophysics

Rest-frame ultraviolet spectrum of the gravitationally lensed galaxy `the 8 o'clock arc': stellar and interstellar medium properties
M. Dessauges-Zavadsky, S. D'Odorico, D. Schaerer, A. Modigliani, C. Tapken, J. Vernet, arXiv:0912.4384 [ps, pdf, other]
Comments: 17 pages, 10 figures, A&A, accepted

From their abstract: "We present the first detailed analysis of the rest-frame UV spectrum of the gravitationally lensed Lyman break galaxy (LBG), the `8 o'clock arc'. The spectrum of the 8 o'clock arc is rich in stellar and interstellar medium (ISM) features, and presents several similarities to the well-known MS1512-cB58 LBG. ... The ISM lines extend over ~1000 km/s and have their peak optical depth blueshifted relative to the stars, implying gas outflows of about -120 km/s. The Ly-alpha line is dominated by a damped absorption profile on top of which is superposed a weak emission, redshifted relative to the ISM lines by about +690 km/s and resulting from multiply backscattered Ly-alpha photons emitted in the HII region surrounded by the cold, expanding ISM shell."

Luminosity-Metallicity Relations for Blue Compact Dwarf Galaxies in the Optical and Near-Infrared
Yinghe Zhao, Yu Gao, Qiusheng Gu, arXiv:0912.4932 [ps, pdf, other]
Comments: 32 pages, 7 figures, accepted for publication in the Astrophysical Journal


Black Holes and AGN

Infrared Diagnostics for the Extended 12 micron Sample of Seyferts
Stefi A. Baum, Jack F. Gallimore, Christopher P. O'Dea, Catherine L. Buchanan, Jacob Noel-Storr, David J. Axon, Andy Robinson, Moshe Elitzur, Meghan Dorn, Shawn Staudaher, Martin Elvis, arXiv:0912.3545 [ps, pdf, other]

Note to self: this paper deals with the correlations within the sample, but does not name the individual members of the sample.


Numerical Astrophysics and Hydrodynamics

Self-Convergence of Radiatively Cooling Clumps
Kristopher Yirak, Adam Frank, Andrew J. Cunningham, arXiv:0912.4777 [pdf, other]
Comments: 24 pages, 7 figures. Submitted to the Astrophysical Journal

They find that a fixed number of cells per radius does not lead to convergence in simulations of radiatively cooling clumps. They present alternative prescriptions for assessing numerical convergence.



X-ray astronomy

A wide field X-ray telescope for astronomical survey purposes: from theory to practice
P. Conconi, S. Campana, G. Tagliaferri, G. Pareschi, O. Citterio, V. Cotroneo, L. Proserpio, M. Civitani, arXiv:0912.5331 [ps, pdf, other]
Comments: Submitted to MNRAS (3 table, 13 figures), comments welcome


Stars, Supernovae and Planets

Mass fluxes for hot stars
L.B. Lucy, arXiv:0912.4209 [ps, pdf, other]
Comments: Submitted to A&A; 6 pages, 5 figures; second revision

Comprehensive Photometric Histories of All Known Galactic Recurrent Novae
Bradley E. Schaefer, arXiv:0912.4426 [pdf, other]
Comments: ApJSupp in press, 273 pages, 34 tables, 71 figures

Note the size of the paper! That is definitely a labor of love.

3D simulations of supernova remnants evolution including non-linear particle acceleration
Gilles Ferrand, Anne Decourchelle, Jean Ballet, Romain Teyssier, Federico Fraschetti, arXiv:0912.4886 [ps, pdf, other]
Comments: accepted for publication in A&A (final version)

PopStar Evolutionary Synthesis Models II: Optical emission-line spectra from Giant Hii regions
M.L. Martín-Manjón, M.L. García-Vargas, M. Mollá, A.I. Díaz, arXiv:0912.4730 [ps, pdf, other]
Comments: 20 pages, 26 figures, accepted for publication in MNRAS Main Journal

Including All the Lines
Robert L. Kurucz, arXiv:0912.5371 [ps, pdf, other]
Comments: 9 pages, no figures. Presented at "Dimitrifest" conference in Boulder, Colorado, March 30 - April 3, 2009
Journal-ref: Recent Directions in Astrophysical Quantitative Spectroscopy and Radiation Hydrodynamics. Edited by I. Hubeny, J.M. Stone, K. MacGregor, and K. Werner. AIP Conference Proceedings 1171, pp. 43-51, 2009


Astrobiology

Galactic Punctuated Equilibrium: How to Undermine Carter's Anthropic Argument in Astrobiology
Milan M. Cirkovic, Branislav Vukotic, Ivana Dragicevic, arXiv:0912.4980 [pdf]
Comments: 3 figures, 26 pages
Journal-ref: Published in Astrobiology, 2009, Volume 9, Issue 5, pp. 491-501

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