Wednesday. Nittsu came, and dropped off boxes from SF. Didn't realize a severe traumatic experience (IKEA shopping this past weekend) could send you into a very bad depression. The depression that came with extreme sleepiness lasted for 2 days, and left this afternoon, as if by magic.
1112.1065
Formation versus destruction: the evolution of the star cluster population in galaxy mergers
Kruijssen, Pelupessy, Lamers, Zwart, Bastian, Icke
Destruction of stellar clusters by galaxy mergers, vs high star-formation rate and rich star cluster populations. Destruction prevails.
1112.1066
Accretion disc wind variability in the states of the microquasar GRS1915+105
Neilsen, Petschek, Lee
Microquasar: BH or NS with accretion disc and jets--a radio emitting x-ray binary. Analysis reveals how the state, structure and X-ray luminosity of the inner accretion disc all conspire to drive the formation and variability of highly-ionized accretion disc winds.
1112.1067
The SPLASH survey: spectroscopy of 15 M31 dSph satellite galaxies
Tollerud et al
Consistent with MW dSph kinematics.
1112.1068
The evolution of the surface brightness of a star cluster as a result of residual star-forming gas expulsion
Lueghausen, Parmentier, Pflamm-Altenburg, Kroupa
Quantify the influence of gas expulsion (assume OB stars do most of it after a delay) on the time-varying surface brightness of stellar clusters. The growth of the core radii show a remarkable core re-virialisation. The decrease of the surface mass density during gas expulsion is large and is only truncated by the re-virialisation process. An embedded star cluster cannot reappear in observational surveys after re-virialization.
1112.1071
HYPERION: an open-source parallelized 3d dust continuum radiative transfer code
Robitaille
3d dust continuum Monte-Carlo radiative transfer code, generic.
1112.1073
The CO-H2 conversion factor in galaxy mergers
Narayanan
The CO-H2 conversion factor is known to be bimodal--one value for discs and quiescent regions, and another (lower) value for mergers and starbursts. Evidence that conversion factor varies with physical environment, as well as theoretical model which aims to understand the physical processes that drive these variations. Apply model to Kennicutt-Schmidt star formation law.
1112.1077
Modeling the red sequence: hierarchical growth
Skelton, Bell, Somerville
Effects of mergers on the evolution of massive early-type galaxies, stellar populations in a hierarchical context. The red-galaxy evolution (assumed by passive, progressive dimming) appears much slower due to mergers, both wet and dry.
1112.1078
Two ten-billion-solar-mass BHs at the centers of giant elliptical galaixes
McConnell, Ma, Gebhardt, Wright, Merphy, Lauer, Graham, Richstone
M87 hosts the most massive BH, 6.3e9 Msun. NGC3842 hosts a 9.7e9 Msun BH; NGC 4889, the BGC of Coma cluster has similar mass. These 2 BHs are significantly more massive than predicted by linearly extrapolating the widely-used correlations betwen BH mass and stellar velocity dispersion or bulge luminosity of the host galaxy [how do they estimate the BH mass?].
1112.1084
The GALEX Arecibo SDSS Survey V: The relation between the HI content of galaxies and metal enrichment at their outskirts
Moran et al
Much of the recent stellar mass growth at the edges of these galaxies can be linked to the accretion or radial transport of relatively pristine gas from beyond the galaxies' stellar disks.
1112.1092
Direct evidence for termnation of obscured star formation by radiatively driven outflows in reddened QSOs
Farrah et al
31 QSOs that show evidence for radiatively driven outflows originating from AGN in their rest-frame UV spectra--study the relationship between the AGN-driven outflow and the AGN and starburst IR luminosities. Find anticorrelation between the strength of AGN driven outflows, as measured from the range of outflow velocities over which absorption exceeds a minimal threshold, and the contribution from star formation to the total IR luminosity, with a much higher chance of seeing a SB contribution. with weak outflows. Conclude that radiatively driven outflows from AGN can have a dramatic, negaative impact on luinous SF in their host galaxies--they curtail SF such that star formation contributes <25% of the total IR luminosity. Also propose degree to which termination of star formation takes place is not deducible from the IR luminosity of the AGN.
1112.1320
The real problem with MOND
Dodelson
Point out the most severe challenge facing MOND--the cosmological matter power spectra.
1112.0330
Nonlinear evolution of cosmological strucures in warm dark matter models
(Aurel) Schneider, Smith, Maccio, Moore
DE dominated WDM model is a promising alternative cosmological scenario; explore LSS formation in this paradigm. (1) halo model approach and (2) ensemble of high-res N-body sims. Important processes which shape the formation of structures: take a detailed look at the halo mass function, concentrations and the linear halo bias of WDM. In all cases find interesting deviations with respect to CDM. In particular, the concentration-mass relation displays a turnover for group scale DM haloes, for he case of WDM particles with masses of the order m_WDM~0.25 keV. Interpreted as a hint for top-down structure formation on small scales. Implement results into the halo model and find much better agreement with simulations. On small scales the WDM halo model now performs as well as its CDM counterpart.
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