Journal Club Archive

Feb. 21, 2012, 1:45 p.m.

LGRT 1033 Lecture Area

Kathryn Grasha
Star Formation History and Dust Content of Galaxies
Andrew Battisti
Line Profiles of Cores within Clusters: The Anatomy of a Filament
Yiming Li
Star Formation Rates in Resolved Galaxies: Near-to-Far Infrared Calibrations

March 13, 2012, 1:45 p.m.

LGRT 1033 Lecture Area

Michael Petersen
Toward Population-Resolved Analysis of the Galactic Center
Zhankui Lu
Origin of Dwarf Spheroidal Galaxies in the Local Group
Yuping Tang
A Herschel view of the far-infrared properties of submillimetre galaxies

March 27, 2012, 3:45 p.m.

LGRT 1033 Lecture Area

Hansung Gim
Cosmic evolution of atomic and molecular hydrogen of galaxies
Seth Johnson
X-ray emission from star-forming galaxies - I. High-mass X-ray binaries

April 3, 2012, 3:45 p.m.

LGRT 1033 Lecture Area

Ryan Cybulski
The Cosmic Web and galaxy evolution around the most luminous X-ray cluster: RXJ1347.5-1145
Stacey Alberts
The Effect of Environment on Star Forming Galaxies at Redshift 1: First Insight from PACS
Frank Ripple
DISCOVERY OF A SIGNIFICANT MAGNETIC CATACLYSMIC VARIABLE POPULATION IN THE LIMITING WINDOW

April 10, 2012, 3:45 p.m.

LGRT 1033 Lecture Area

Shuiyao Huang
The Origin of Disks and Spheroids in Simulated Galaxies
Shawn Roberts
Possible Charge Exchange X-ray Emission in the Cygnus Loop Detected with Suzaku
Bomee Lee
A Large population of massive compact post-starburst galaxies at z>1: Implications for the size evolution and quenching mechanism of quiescent galaxies

April 24, 2012, 3:45 p.m.

LGRT 1033 Lecture Area

Neal Katz
1.5 minute talk marathon by everyone

Feb. 12, 2013, 3:45 p.m.

LGRT 1033

Shuiyao Huang
Baryons Matter: Why Luminous Satellite Galaxies Have Reduced Central Masses
Yiming Li
Geometric Offsets Across Spiral Arms in M51: Nature of Gas and Star Formation Tracers
Andrew Battisti
Star Formation Rates in Molecular Clouds and the Nature of the Extragalactic Scaling Relations

Feb. 26, 2013, 3:45 p.m.

LGRT 1033

Zhon Butcher
Confronting Cold Dark Matter Predictions with Observed Galaxy Rotations
Joe Burchett
Radiation Pressure from Massive Star Clusters as a Launching Mechanism for Super-galactic Winds
Yuping Tang
Modelling the dust emission from dense interstellar clouds: disentangling the effects of radiative transfer and dust properties

March 5, 2013, 3:45 p.m.

LGRT 1033

Hansung Gim
Nuclear Activity is more prevalent in Star-Forming Galaxies
Allison Kirkpatrick
The Effect of the CMB on High Redshift Observations
Seth Johnson
Spitzer- and Herschel-based Spectral Energy Distributions of 24 um Bright z~0.3-3.0 Starbursts and Obscured Quasars

April 9, 2013, 3:45 p.m.

LGRT 1033

Stacey Alberts
The evolution of the star formation activity per halo mass up to redshift ~1.6 as seen by Herschel
Bomee Lee
The star formation mass sequence out to z=2.5
Brandt Gaches
Gravity as a Thermodynamic Effect

April 16, 2013, 3:45 p.m.

LGRT 1033

Riwaj Pokhrel
A Link to the Past: Using Markov Chain Monte Carlo Fitting to Constrain Fundamental Parameters of High-Redshift Galaxies
Timothy Conklin
H2O emission in high-z ultraluminous infrared galaxies
Shawn Roberts
The rates and modes of gas accretion on to galaxies and their gaseous haloes

April 30, 2013, 3:45 p.m.

LGRT 1033

Kathryn Grasha
The Rise of an Ionized Wind in the Narrow Line Seyfert 1 Galaxy Mrk 335 Observed by XMM-Newton and HST

Sept. 17, 2013, 3:45 p.m.

LGRT 1033

Andrew Battisti
THE CALIBRATION OF STAR FORMATION RATE INDICATORS FOR WISE 22μm-SELECTED GALAXIES IN THE SLOAN DIGITAL SKY SURVEY
Hansung Gim
A New Interpretation of the Far-infrared Radio Correlation and the Expected Breakdown at High Redshift

Sept. 24, 2013, 3:45 p.m.

LGRT 1033

Riwaj Pokhrel
AN ANALYSIS OF AGE VARIATIONS IN THE STELLAR POPULATIONS OF NGC 300
Brandt Gaches
Applications of Atomic Cooling in DSMC Methods

Oct. 1, 2013, 3:45 p.m.

LGRT 1033

Michael Petersen
THE IMPACT OF BARS ON DISK BREAKS AS PROBED BY S4G IMAGING
Stacey Alberts
The Evolution of Dust-Obscured Star Formation Activity in Galaxy Clusters Relative to the Field Over the Last 9 Billion Years
Ryan Cybulski
H-alpha3: an H-alpha imaging survey of HI selected galaxies from ALFALFA, III. Nurture builds up the Hubble sequence in the Great Wall

Oct. 8, 2013, 3:45 p.m.

LGRT 1033

Allison Kirkpatrick
Measuring galaxy star formation rates from integrated photometry: insights from color-magnitude diagrams of resolved stars
Zhankui Lu
How supernova feedback turns dark matter cusps into cores
Seunghwan Lim
The abundance of voids and the excursion set formalism

Oct. 22, 2013, 3:45 p.m.

LGRT 1033

Yuping Tang
Variation in dust properties in a dense filament of the Taurus molecular complex
Chris Thibodeau
Redshift evolution of the distribution of star formation among dark matter halos
Michelle Benoit
GAMA/H-ATLAS: Linking the Properties of Sub-mm Detected and Undetected Early-Type Galaxies: I. z<=0.06 Sample

Oct. 29, 2013, 3:45 p.m.

LGRT 1033

Kathryn Grasha
High-Metallicity Quasar Outflows: Studying the Fingerprints of the Universe with the Cosmic Origins Spectrograph

Nov. 5, 2013, 3:45 p.m.

LGRT 1033

Joe Burchett
Large Metal-Enriched Circumgalactic Envelopes or Dwarfs Hiding in the Darkness?

Nov. 12, 2013, 3:45 p.m.

LGRT 1033

Shawn Roberts
Gas Accretion in Simulations with Supernovae Driven Feedback

Nov. 19, 2013, 3:45 p.m.

LGRT 1033

Shuiyao Huang
Cosmological Simulation with the Pressure-Entropy Formulation of Smoothed Particle Hydrodynamics

Dec. 3, 2013, 3:45 p.m.

LGRT 1033

Karl Haislmaier
Probing the IGM-galaxy connection at z < 0.5 - II. New insights into the galaxy environments of O VI absorbers in PKS 0405-123
Mihwa Han
Dust May Be More Rare Than Expected in Metal Poor Galaxies
Zhon Butcher
A fundamental relation between the metallicity, gas content, and stellar mass of local galaxies

Feb. 4, 2014, 3:45 p.m.

LGRT 1033

Zhon Butcher
Evolution of dwarf galaxies: a dynamical perspective
Kathryn Grasha
Observations of HI 21 cm absorption at High-Redshift

Feb. 11, 2014, 3:45 p.m.

LGRT 1033

Shuiyao Huang
A SIMPLE MODEL LINKING GALAXY AND DARK MATTER EVOLUTION
Brandt Gaches
Hierarchical Structure of Magnetohydrodynamic Turbulence In Position-Position-Velocity Space

Feb. 25, 2014, 3:45 p.m.

LGRT 1033

Shawn Roberts
Galaxies on FIRE (Feedback in Realistic Environments): Stellar Feedback Explains Cosmologically Inefficient Star Formation
Joe Burchett
The Baryon Cycle of Dwarf Galaxies: Dark, Bursty, Gas-Rich Polluters

March 4, 2014, 3:45 p.m.

LGRT 1033

Michael Petersen
The Formation and Evolution of Bars as Drivers of Galactic Structure

March 11, 2014, 3:45 p.m.

LGRT 1033

Ryan Cybulski
From voids to Coma: the prevalence of pre-processing in the local Universe

March 25, 2014, 3:45 p.m.

LGRT 1033

Yuping Tang
Dust emissivity in Submillimeter Galaxies
Hansung Gim
The Green Valley is a Red Herring: Galaxy Zoo reveals two evolutionary pathways towards quenching of star formation in early- and late-type galaxies

April 1, 2014, 3:45 p.m.

LGRT 1033

Mihwa Han
The Nature of Starbursts. III. The Spatial Distribution of Star Formation
Riwaj Pokhrel
Filamentary accretion flows in the embedded Serpens South protocluster.

April 8, 2014, 3:45 p.m.

LGRT 1033

Chris Thibodeau
Outflow from the Cosmic Eyelash
Allison Kirkpatrick
What Lies Beneath: Probing Dust Obscured Star Formation and Black Hole Growth through Spectral Energy Distributions

April 15, 2014, 3:45 p.m.

LGRT 1033

Seunghwan Lim
Discovery of the Recombining Plasma In the South of the Galactic Center: A Relic of the Past Galactic Center Activity?
Bomee Lee
Intrinsic characteristics of galaxies at 1≤z≤3.5 in the SFR-M* plane

April 22, 2014, 3:45 p.m.

LGRT 1033

Zhankui Lu
Assembly of Galaxies in Dark Matter Halos

April 29, 2014, 3:45 p.m.

LGRT 1033

Andrew Battisti
Continuous Mid-Infrared Star Formation Rate Indicators
Karl Haislmaier
Metal-line absorption around z~2.4 star-forming galaxies

Nov. 18, 2014, 4 p.m.

LGRT 1033

Riwaj Pokhrel
Title: A HERSCHEL-SPIRE SURVEY OF THE MON R2 GIANT MOLECULAR CLOUD Abstract: We present a far-IR survey of the entire Mon R2 GMC covering 4.30 deg by 4.36 deg, obtained with SPIRE and cross-calibrated with Planck-HFI data for absolute off- set and zero point correction. As the best representation of cold dusty molecular clouds, we fit the far-IR SEDs of each pixel with modified blackbody function. We fixed the dust emissivity, \beta, across all fits with the help of the flux ratio plot and found the most optimal value as 1.8. We studied the nature of distribution of column densities. We found that below 7 × 10^{20} cm^{&#8722;2} , the distribution is log-normal in nature whereas above this value, the distribution takes the power-law form. We performed an algorithmic extraction of nested structures from the col- umn density map using the python software package, astrodendro, and found the presence of structures with a variety of aspect ratios. We examined the impact of different fundamental gas configurations (sphere, sheet, filament) on the critical mass and free-fall times derived from our data. We studied the radial profile of filaments and found that the outer density profile takes a power-law form with a shallower slope than for an isothermal filament in equilibrium, suggesting that these filaments are unstable to further collapse.

Nov. 12, 2014, 4 p.m.

LGRT 1033

Brandt Gaches
Title: ASTROCHEMICAL CORRELATIONS IN MOLECULAR CLOUDS Abstract: We investigate the spectral correlations between different species used to observe molecular clouds. We use hydrodynamic simulations and a full chemical network to study the abundances of over 150 species in typical Milky Way molecular clouds. We perform synthetic observations in order to produce emission maps of a subset of these tracers. We study the effects of different lines of sight and spatial resolution on the emission distribution and perform a robust quantitative comparison of the species to each other. We use the Spectral Correlation Function (SCF), which quantifies the root mean squared difference between spectra separated by some length scale, to characterize the structure of the simulated cloud in position-position-velocity (PPV) space. We predict the observed SCF for a broad range of observational tracers, and thus, identify homologous species. In particular, we show that the pairs C and CO, C+ and CN, NH3 and H2CS have very similar SCFs. We measure the SCF slope variation as a function of beam size for all species and demonstrate that the beam size has a distinct effect on different species emission. However, for beams of up to 10”, placing the cloud at 1 kpc, the change is not large enough to move the SCF slopes into different regions of parameter space. The results from this study provide observational guidance for choosing the best tracer to probe various cloud length scales.

Nov. 4, 2014, 4 p.m.

LGRT 1033

Joe Burchett
Quenching of Star Formation in SDSS Groups: Centrals, Satellites and Galactic Conformity

Nov. 4, 2014, 4 p.m.

LGRT 1033

Zhankui Lu
The dark side of galaxy colour: evidence from new SDSS measurements of galaxy clustering and lensing

Oct. 28, 2014, 4 p.m.

1033 LGRT

Shawn Roberts
Internal properties and environments of dark matter haloes
Michael Petersen
Connecting the cosmic web to the spin of dark haloes: implications for galaxy formation

Oct. 21, 2014, 4 p.m.

LGRT 1033

Kathryn Grasha
Are Dusty Galaxies Blue? Insights On UV Attenuation From Dust-Selected Galaxies
Shuiyao Huang
GIZMO: A New Class of Accurate, Mesh-Free Hydrodynamic Simulation Methods

Sept. 23, 2014, 4 p.m.

LGRT 1033

Zhon Butcher
Galaxy And Mass Assembly (GAMA): The dependence of the galaxy luminosity function on environment, redshift and colour.

Sept. 16, 2014, 4 p.m.

LGRT 1033

Seunghwan Lim
Title : The Nearest Stellar Factory : Suzaku X-ray study on 30 Doradus Abstract : We explored the general properties of the diffuse plasma in the 30 Doradus, using Suzaku observations. Exploiting high spectral resolution and a low and stable instrumental background of Suzaku, we were able to do more reliable investigations on 30 Dor. We found that the four seperate wing-like regions of 30 Dor can be modeled as diffuse thin thermal plasma of ~5*10^6K and share quite similar temperatures and chemical enrichments, which could be originating from one of the stellar population at the center of 30Dor. We also found that, because of different column densities of the regions, the overall properties of the whole region as a single spectra should be explored with a more flexible model. This implies that when we observe a distant diffuse object not to be spatially resolved, the spatial mix of the regions is likely to require more careful modeling in order to constrain the parameters such as abundances properly. We also report energy crisis in 30 Dor and possible flatter powerlaw component around the central region.
Chris Thibodeau
Title: The Effect of Clustering on Recovering Sources in Millimeter Surveys Abstract: Surveys of galaxies in millimeter and submillimeter wavelengths probe the dust emission from star-forming galaxies at redshifts 1 < z < 8, and so allow the study of galaxy formation and evolution across cosmic time. However, galaxy clustering can complicate source identification. In this study, we have created and analysed 0.7-by-0.7-degree simulated maps at 1100 microns convolved with an 8-arcsec telescope beam (AzTEC on the 32m Large Millimeter Telescope). The map is populated using a differential counts model by Béthermin et al. (2011). We find that in the case of strong clustering between the source positions, the 60% and 80% completeness limits are about a factor of two higher in flux than the case where sources are positioned randomly (no clustering). We also find an increase in artificial flux boosting of the sources for a given completeness percent that is about a factor of two higher in the strong clustering case than the no-clustering case. This analysis is useful because it allows us to anticipate confusion and flux boosting as a function of detected source flux of AzTEC at a 32m LMT aperture and correct for them in surveys as appropriate. Lastly, we suggest that these results are robust for maps greater than about 0.16 square degrees.

Oct. 7, 2014, 4 p.m.

LGRT 1033

Bomee Lee
How dead are dead galaxies? MID-Infrared fluxes of quiescent galaxies at redshift 0.3<z<2.5: Implication for star-formation rates and dust heating.
Ryan Cybulski
The GALEX Ultraviolet Virgo Cluster Survey (GUViCS). IV: The role of the cluster environment on galaxy evolution.