Journal Club Archive

LGRT 1033 Lecture Area

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^{−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.

LGRT 1033 Lecture Area
 

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.

LGRT 1033 Lecture Area

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

 

 

LGRT 1033 Lecture Area

Joe Burchett

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

LGRT 1033 Lecture Area

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

LGRT 1033 Lecture Area

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

LGRT 1033 Lecture Area

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.

LGRT 1033 Lecture Area

Zhon Butcher

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

LGRT 1033 Lecture Area

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.

LGRT 1033 Lecture Area

Andrew Battisti

Continuous Mid-Infrared Star Formation Rate Indicators

Karl Haislmaier

Metal-line absorption around z~2.4 star-forming galaxies

LGRT 1033 Lecture Area

Zhankui Lu

Assembly of Galaxies in Dark Matter Halos

LGRT 1033 Lecture Area

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

LGRT 1033 Lecture Area

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

LGRT 1033 Lecture Area
 

Mihwa Han

The Nature of Starbursts. III. The Spatial Distribution of Star Formation

Riwaj Pokhrel

Filamentary accretion flows in the embedded Serpens South protocluster.

 

 

LGRT 1033 Lecture Area

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

LGRT 1033 Lecture Area

Ryan Cybulski

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

LGRT 1033 Lecture Area

Michael Petersen

The Formation and Evolution of Bars as Drivers of Galactic Structure

LGRT 1033 Lecture Area

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

LGRT 1033 Lecture Area

Shuiyao Huang

A SIMPLE MODEL LINKING GALAXY AND DARK MATTER EVOLUTION

Brandt Gaches

Hierarchical Structure of Magnetohydrodynamic Turbulence In Position-Position-Velocity Space

LGRT 1033 Lecture Area

Zhon Butcher

Evolution of dwarf galaxies: a dynamical perspective

Kathryn Grasha

Observations of HI 21 cm absorption at High-Redshift

LGRT 1033 Lecture Area

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

 

 

LGRT 1033 Lecture Area

Shuiyao Huang

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

LGRT 1033 Lecture Area

Shawn Roberts

Gas Accretion in Simulations with Supernovae Driven Feedback

LGRT 1033 Lecture Area

Joe Burchett

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

LGRT 1033 Lecture Area

Kathryn Grasha

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

LGRT 1033 Lecture Area

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

LGRT 1033 Lecture Area

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

LGRT 1033 Lecture Area

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

LGRT 1033 Lecture Area
 

Riwaj Pokhrel

AN ANALYSIS OF AGE VARIATIONS IN THE STELLAR POPULATIONS OF NGC 300

Brandt Gaches

Applications of Atomic Cooling in DSMC Methods

LGRT 1033 Lecture Area
 

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

LGRT 1033 Lecture Area

Christina Williams

Evolution of Quiescent and Star-Forming Galaxies since z ~ 1.5 as a function of their velocity dispersions

Kathryn Grasha

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

LGRT 1033 Lecture Area

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

LGRT 1033 Lecture Area

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

LGRT 1033 Lecture Area
 

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

 

 

LGRT 1033 Lecture Area

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

LGRT 1033 Lecture Area

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

LGRT 1033 Lecture Area

1.5 minute talk marathon by everyone

 

 

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

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

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

Christina Williams

the relationship between dusty star formation and galaxy clusters at high-redshift

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

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