Day 620

Wednesday.

1404.0007
Matched filter optimization of kSZ measurements with a reconstructed cosmological flow field
Li, Angulo, White, Jasche

Develop and test a new statistical method to measure the kSZ effect.  A sample of independently detected clusters is combined with the cosmic flow field predicted from a galaxy redshift survey in order to derive a matched filter that optically weights the kSZ signal for the sample as a whole given the noise involved in the problem.  Apply this formalism to realistic mock microwave skies based on cosmo N-body sims, and demonstrate its robustness and performance.  In particular, carefully assess the various sources of uncertainty, CMB primary fluctuations, instrumental noise, uncertainties in the determination of the velocity field, and effects introduced by miscentering of clusters and by scatter in the mass-observable relations.  Show that available data (Planck and MaxBCG) should deliver a 7.7 sigma detection of the kSZ.  A similar cluster catalogue with broader sky coverage should increase the detection significance ego ~13 sigma.  Point out that such measurements could be binned in order to study the properties of the cosmic gas and velocity fields, or combined into a single measurement to constraint cosmological parameters or deviations of the law of gravity from GR.

1404.0023
Candidate clusters of galaxies at $z>1.3$ identified in the Spitzer SPT deep field survey
Rettura, … Stern, Mei, … Gonzalez, Bartlett, et al

Present 279 galaxy cluster candidates at z>1.3 from the 94 deg2 SSDF survey. …  Derive that at z=1.5, these clusters reside in haloes larger than M_minn=1.5e14 Msun/h.  (From SZ decrements/X-ray masses)  Measured angular correlation function; shows strong clustering.  

1404.0316
Measuring the stellar masses of z~7 galaxies with Spitzer ultra faint survey program (SURFS UP)
Ryan, Gonzalez, …  Bradac, … Allen, … Gladders, … Hildetrandt, … Schrabback, … Treu, von der Linden, Zaritsky, et al

Present nine z'-band dropouts highly magnified (2<mu<12) by the Bullet Cluster.  Combine archival imaging with the Program, which results in a total integration time of ~30 hr per IRAC band.  Detect (>3 sigma) in both IRAC bands the brightest of these high-z galaxies, with [3.6]=23.8 mag, [4.5]=23.78 mag, and (H-[3.6])=1.17 mag.  The remaining 8 galaxies are undetected to [3.6]~26.4 mag and [4.5]~26.0 mag with stellar masses of 5e7 Msun.  The detected galaxy has an estimated magnification of mu=12, which implies this galaxies has an UV luminosity of L_1500~0.3 L*_{z=7} -- the lowest luminosity individual source detected in IRAC at z>7.  By modeling the broadband photometry, estimate the galaxy has an intrinsic SFR of 1.3 Msun/yr and stellar mass of M~2e9 Msun, which gives a sSFR of 0.7 Gyr^-1.  If this galaxy had sustained this SFR since z~20, it could have formed the observed stellar mass (to within a factor of ~2).  Discuss alternate SFHs and argue the exponentially-increasing model is unlikely.  FInally, based on the intrinsicSFR, estimate this galaxy has a likely [C II] flux of <f_[C II]> = 1e-17 erg/s/cm^2.

1404.0330
Orientation of galaxies in structures
Panko, et al

The investigation of the orientation of galaxies is a standard test concerning to scenarios of galaxy formation, because different theories of galaxy formation make various predications regarding to the angular momentum of galaxies.  The new method of analysis of the alignment of galaxies in clusters was proposed in Godlowski 2012, and has been improved.  Analyzed the distribution of the position angles of the galaxy major axes, as well as the distribution of two angles describing the spatial orientation of galaxy plane, which gives the information about galaxy angular momenta.  Discuss the orientation of galaxies in groups and clusters of galaxies.  The results show the dependence of the alignment wrt clusters richness.  The implications of the results for theories of galaxy formation are discussed.

1404.0373
On quantifying and resolving the BICEP2/Planck tension over gravitational waves
Smit, Dvorkin, … Turok, Halpern, … et al

The recent BICEP2 measurement of primordial gravity waves (r=0.2) appears to be in tension with the upper limit from WMAP (r<0.13 at 95% CL) and Planck (r<0.11).  Carefully quantify the level of tension and show that it is very significant when the observed deficit of LS temperature power is taken into account.  Show that measurements of TE and EE power spectra in the near future will discriminate between the hypothesis that this tension is either a statistical fluke, or a sign of new physics.  Also discuss extensions of the standard cosmological model that relieve the tension, and some novel ways to constrain them.