Day 607

Friday.

1403.3086
Kiloparsec-scale outflows are prevalent among luminous AGN: outflows are feedback in the context of the overall AGN population
Harrison et al

…Study demonstrates that galaxy-wide energetic outflows are not confide to the most extreme SF galaxies or radio-luminous AGN; however, there may be a higher incidence of the most extreme outflow velocities in quasars hosted in ULIRGs.  Both SF and AGN activity appear to be energetically viable to drive the outflows and find no definitive evidence that favors one process over the other.  Although highly uncertain, derive mass outflow rates (typically ~10x the SFRs), kinetic energies and momentum rates consistent with theoretical models that predict AGN-driven outflows play a significant role in shaping the evolution of galaxies.

1403.3092
Candidate gravitational microlensing events for future direct lens imaging
Henderson, … Gould, et al

The mass of lenses giving rise to Galactic microlensing events can be constrained by measuring the relative lens-source proper motion and lens flux.  The flux of the lens can be separated from that of the source, companions to the source, and unrelated nearby stars with high-resolution images taken when the lens and source are spatially resolved.  For typical ground-based adaptive optics (AO) or space-based observations, this requires either inordinately long time baselines or high relative proper motions.  Provide a list of microlenisng events toward the Galactic Bulges with high relative lens-source proper motion that are therefore good candidates for constraining the lens mass with future high-resolution imaging.  Investigate all events from 2004-2013 that display detectable finite-source effects, a feature that allows us to measure the proper motion.  In total, present 20 events with mu>~8 mas/yr. Of these, 14 were culled from previous analyses while 6 are new.  In <~12 years the lens and source of each event will be sufficiently separated for ground-based telescopes with AO systems or space telescopes to resolve each component and further characterize the lens system.  Furthermore, for the most recent events, comparison of the lens flux estimates from images taken immediately to those estimated from images taken when the lens and source are resolved can be used to empirically check the robustness of the single-epoch method currently being used to estimate lens masses for many events.

1403.3104
Ionized gas disks in elliptical and S0 galaxies at $z<1$
Jaffe et al

Analyse the extended, ionized-gas emission of 24 ETGs at 0<z<1 from EDisCS.  Discuss different possible sources of ionization and favor SF as the main cause of the observed emission.  10 galaxies have disturbed gas kinematics, while 14 have rotating gas disks.  In addition, 15 galaxies are in the field, while 9 are in the infall regions of clusters.  This implies that, if the gas has an internal origin, this is likely stripped as the galaxies get closer to the cluster center.  If the gas instead comes from an external source, then results suggest that this is more likely acquired outside the cluster environment, where galaxy-galaxy interactions more commonly take place.  Analyse the TF relation of the ETGs with gas disks, and compare them to DEisCS spirals.  Taking a matched range of redshifts, M_B<-20, and excluding galaxies with large velocity uncertainties, find that at fixed rotational velocities, ETGs are 1.7 mag fainter in M_B than spirals.  At fixed stellar mass, also find that ETGs have systematically lower sSFRs than spirals.  This study constitutes an important step forward towards the understanding of the evolution of the complex ISM in ETGs by significantly extending the look-back-time baseline explored so far.

1403.3168
Multiwavelength investigations of co-evolution of bright custer galaxies [sic]
Hashimoto, Henry, Boehringer

Report a systematic multi-wavelenth investigation of environments of the BCGs, using X-ray data from Chandra, and optical images with Subaru.  Goal is to help understand the relationship between the BCGs and their host clusters, and between the BCGs and other galaxies, to eventually address a question of the formation and co-evolution of BCGs and the clusters.  Results include: 1) morphological variety of BCGs, or the second or the third BCG2/BCG3, is comparable to that of other bright red sequence galaxies, suggesting that there are continuous variation of morphology between the BCGs, rather than a sharp separation between the BCG and the rest of the bright galaxies.  2) The offset of the BCG position relative to the cluster center is correlated to the degree of concentration of cluster X-ray morphology (Spearman rho=-0.79), consistent with an interpretation that BCGs tend to be off-centered inside dynamically unsettled clusters.  3) Morphologically disturbed clusters tend to harbor the brighter BCGs, implying that the "early collapse" may not be the only major mechanism to control the BCG formation and evolution.