Wednesday.
1209.3770
Characterizing the otpical variability of bright blazers: variability-based selection of Fermi AGN
Ruan, ..., Ivezic, Kochanek, et al
Use of optical photometric variability to select and identify blazars in large-scale time-domain surveys, for identification of blazar counterparts to ~30% of the gamma-ray sources in Fermi. Use data from LINEAR astroid survey (optical). Impose cuts on minimum tau (characteristic timescales of variability) and sigma (driving amplitudes on short timescales) allows for blazar selection with high efficiency and completeness. Estimate tau for blazars is ~3 years in rest frame of jet, in contrast to ~320 day disk flux for quasars.
1209.3771
Perturbation theory approach for the power spectrum: from dark matter in real space to haloes in redshift space
Gil-Marin, Wagner, Verde, Porciani, Jiminez
Investigate the accuracy of Eularian perturbation theory for describing the matter and galaxy power spectra in real and redshift space. Compare analytical results with N-body sims (160 boxes of 13.8 (Gpc/h)^3): resumming terms in standard perturbative approach is accurate to <2% for k<0.2 h/Mpc at z<1.5. Higher order terms in the resummed propagator increases accuracy. If halo bias known, f can be recovered with in <5%.
1209.3775
Using machine learning for discovery in synoptic survey imaging
Brink, Richards, Poznanski, Bloom, Rice, ... et al
Using Palomar Transient Factory, 30k objects, demonstrate a missed detection rate of <7.7% and false-positive rate of 1% for an optimized ML classifier of 23 features, selected ot avlid feature correlation and over-fitting from an initial library of 42 attributes. ML enables maximum science gain for future synoptic survey, and enable fast follow-up decisions.
1209.3785
Hair of astrophysical black holes
Lyutikov
The "no hair" theorem is not applicable to black holes formed from collapse of a rotating neutron star; it can trap B-field lines before and during collapse. ...
1209.3786
Measuring the ultimate mass of galaxy clusters: redshifts and mass profiles from the Hectospec cluster survey (HeCS)
Rines, Geller, Diaferio, Kurtz
Measuring cluster mass profiles into the infall regions provide an estimate of the ultimate mass of cluster haloes. Use Caustic technique to meausre cluster mass profiles from galaxy redshifts from HeCS. 58 clusters at 0.1<z<0.3 surveyed based on X-ray flux; 21k redshifts measured, 10k are cluster members. Cluster members trace out infall patterns around clusters. Velocity dispersions decline with radius. Determination of the velocity dispersion is insensitive to the inclusion of blue members.
1209.3788
Evidence for two distinct stellar initial mass functions
Zaritsky, Colucci, Pessev, Bernstein, Chandar
Measurement of 20 local group stellar clusters. The young (age < 1e9.5 yr) clusters are well-described by a bottom-heavy IMF (Salpeter) while older clusters are better described by top-heavy IMF (light Kroupa), although neither of these specific forms is a unique solution. Sample is currently small, finding depends on 4 key clusters. Need more samples.
1209.3790
A new HSTHerschel deep field at the North ecliptic pole: prepareing the way for JWST, SPICA and Euclid
Serjeant et al
Propose a co-ordinated multi-observatory survey at NEP, an extragalactic deep field, covered by Planck, WISE, eROSITA, Herschel, HST, JWST, SPICA, Euclid, AKARI, LOVAR, SCUBA-2. Scans wavelengths of redshifted PAH and slilcate features. Need 10 sq arcmin in UV/optical, and a wide field survey of >100 sq arcmin coordinated with submm SPIRE. White paper submitted to HST.
1209.3805
The A2667 giant arc at z=1.03: evidence for large-scale shocks at high redshift
Yuan, Kewley, Swinbank, Richard
Intrinsic spatial resolution of 110-405 pc of the arc. Central 350 pc dominated with SF. Elevated [NII]/Halpha is contaminated by a significant fraction of shock excitation due to galactic outflows. Shocked regions may mimic flat or inverted metallicity gradients at high z.
1209.3825
The central density of R136 in 30 Doradus
Selman, Melnick
It's about 1.5e4 Msun/pc^3.
1209.3968
New approach to measure the quasar luminosity function in 0.7<z<4.0 from dedicated SDSS-III and MMT data
Palanque-Delabrouille et al
1877 quasar spectra at 0.68<z<4 from MMT, derive quasar LF. 30 qso/deg^2.
1209.4033
PeV neutrinos from the propagation of ultra-high energy cosmic rays
Roulet, Sigl, Vliet, Mollerach
As the title says. Found a PeV neutrino, assess if it's from HECR.
1209.3770
Characterizing the otpical variability of bright blazers: variability-based selection of Fermi AGN
Ruan, ..., Ivezic, Kochanek, et al
Use of optical photometric variability to select and identify blazars in large-scale time-domain surveys, for identification of blazar counterparts to ~30% of the gamma-ray sources in Fermi. Use data from LINEAR astroid survey (optical). Impose cuts on minimum tau (characteristic timescales of variability) and sigma (driving amplitudes on short timescales) allows for blazar selection with high efficiency and completeness. Estimate tau for blazars is ~3 years in rest frame of jet, in contrast to ~320 day disk flux for quasars.
1209.3771
Perturbation theory approach for the power spectrum: from dark matter in real space to haloes in redshift space
Gil-Marin, Wagner, Verde, Porciani, Jiminez
Investigate the accuracy of Eularian perturbation theory for describing the matter and galaxy power spectra in real and redshift space. Compare analytical results with N-body sims (160 boxes of 13.8 (Gpc/h)^3): resumming terms in standard perturbative approach is accurate to <2% for k<0.2 h/Mpc at z<1.5. Higher order terms in the resummed propagator increases accuracy. If halo bias known, f can be recovered with in <5%.
1209.3775
Using machine learning for discovery in synoptic survey imaging
Brink, Richards, Poznanski, Bloom, Rice, ... et al
Using Palomar Transient Factory, 30k objects, demonstrate a missed detection rate of <7.7% and false-positive rate of 1% for an optimized ML classifier of 23 features, selected ot avlid feature correlation and over-fitting from an initial library of 42 attributes. ML enables maximum science gain for future synoptic survey, and enable fast follow-up decisions.
1209.3785
Hair of astrophysical black holes
Lyutikov
The "no hair" theorem is not applicable to black holes formed from collapse of a rotating neutron star; it can trap B-field lines before and during collapse. ...
1209.3786
Measuring the ultimate mass of galaxy clusters: redshifts and mass profiles from the Hectospec cluster survey (HeCS)
Rines, Geller, Diaferio, Kurtz
Measuring cluster mass profiles into the infall regions provide an estimate of the ultimate mass of cluster haloes. Use Caustic technique to meausre cluster mass profiles from galaxy redshifts from HeCS. 58 clusters at 0.1<z<0.3 surveyed based on X-ray flux; 21k redshifts measured, 10k are cluster members. Cluster members trace out infall patterns around clusters. Velocity dispersions decline with radius. Determination of the velocity dispersion is insensitive to the inclusion of blue members.
1209.3788
Evidence for two distinct stellar initial mass functions
Zaritsky, Colucci, Pessev, Bernstein, Chandar
Measurement of 20 local group stellar clusters. The young (age < 1e9.5 yr) clusters are well-described by a bottom-heavy IMF (Salpeter) while older clusters are better described by top-heavy IMF (light Kroupa), although neither of these specific forms is a unique solution. Sample is currently small, finding depends on 4 key clusters. Need more samples.
1209.3790
A new HSTHerschel deep field at the North ecliptic pole: prepareing the way for JWST, SPICA and Euclid
Serjeant et al
Propose a co-ordinated multi-observatory survey at NEP, an extragalactic deep field, covered by Planck, WISE, eROSITA, Herschel, HST, JWST, SPICA, Euclid, AKARI, LOVAR, SCUBA-2. Scans wavelengths of redshifted PAH and slilcate features. Need 10 sq arcmin in UV/optical, and a wide field survey of >100 sq arcmin coordinated with submm SPIRE. White paper submitted to HST.
1209.3805
The A2667 giant arc at z=1.03: evidence for large-scale shocks at high redshift
Yuan, Kewley, Swinbank, Richard
Intrinsic spatial resolution of 110-405 pc of the arc. Central 350 pc dominated with SF. Elevated [NII]/Halpha is contaminated by a significant fraction of shock excitation due to galactic outflows. Shocked regions may mimic flat or inverted metallicity gradients at high z.
1209.3825
The central density of R136 in 30 Doradus
Selman, Melnick
It's about 1.5e4 Msun/pc^3.
1209.3968
New approach to measure the quasar luminosity function in 0.7<z<4.0 from dedicated SDSS-III and MMT data
Palanque-Delabrouille et al
1877 quasar spectra at 0.68<z<4 from MMT, derive quasar LF. 30 qso/deg^2.
1209.4033
PeV neutrinos from the propagation of ultra-high energy cosmic rays
Roulet, Sigl, Vliet, Mollerach
As the title says. Found a PeV neutrino, assess if it's from HECR.
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