Photo Thanks to Marla Geha and Josh SimonThe asterisks indicate talks with a strong theoretical or modeling component.
Why Are We Here?
Mario Mateo
PDF/PPT
- Introductory talk
- Outline of the big picture: why do we study dwarfs?
Are There Evolutionary Links Between Dwarf Galaxies?
Eva Grebel
- Differences in evolutionary histories of gas rich vs. poor systems
- Morphological segregation (LG, M81 group)
- Links to reionization
Star Formation Histories in the Local Group and Beyond
Andrew Dolphin
PDF/PPT
- Resolved stellar populations using HST
- Comparison of different SFHs
- Technical and modeling difficulties
- What will the future be after HST?
Low-Mass Systems: the Semi-Analytical View *
Rachel Somerville
PDF/PPT
- Outline of current models with focus on lowest mass systems
- SF efficiency in dwarf galaxies
- Do dwarfs resemble the building blocks of massive galaxies?
- If there were true protogalaxies left, how would we find them?
Low-mass systems: the N-body/SPH view *
Lucio Mayer
PDF/PPT
- Predictions for dwarf (elliptical) galaxies
- Tidal stripping and internal dynamics of dwarfs
Chemical Signatures of Hierarchical Galaxy Formation
Kim Venn
PDF/PPT
- Comparison abundances of Galactic Disk, Bulge, and Halo to LG dwarfs. Is it meaningful?
- Constraints on hierarchical galaxy formation
Model Predictions for Dwarf Dark Matter Halos *
Oleg Gnedin
PDF/PPT
- Are missing satellites a problem?
- Anisotropic distribution of Galactic satellites
- Substructure crisis and possible solutions
- Can feedback create constant density cores in dwarfs?
- What are other possibilities?
Fossils and Survivors: Formation Histories of Local Group Dwarfs *
Nick Gendin
PDF/PPT
- Comparison of LG dwarfs and simulated galaxies
- Fossils vs. survivors
- LG dwarfs and the SF law at high z
- What observations are needed to test the models?
Abundance Patterns in Local Group Dwarfs
Eline Tolstoy
- Results from the dwarf abundances and radial velocities team (DART)
- Can we relate stellar to ISM abundances?
- Open questions and future observations
The Chemical Evolution of Dwarf Galaxies *
Kathryn Johnston
- Gas mixing, gas cycles and chemical evolution
- The role of gas infall
- Chemical abundance constraints on hierarchical assembly of halos and dwarfs
Dwarf Elliptical Galaxies
Liese van Zee
PDF/PPT
- Dynamics in dwarf ellipticals
- Differences in star formation modes with respect to other dwarfs
On the possible disk nature of bright early-type dwarfs in the Virgo cluster
Thorsten Lisker
PDF/PPTI present the results from a systematic search for disk features in early-type dwarfs (dE/dS0) of the Virgo cluster, using optical imaging data from the SDSS. We identify disk features in 37 out of 414 galaxies, and address the following questions: Are these galaxies just ordinary dwarf ellipticals with an embedded disk, or are they genuine disk galaxies and therefore a different species? How are they distributed spatially within the cluster as compared to other galaxy types? What constraints do our disk detections put on formation scenarios of early-type dwarfs? Our results can be correlated with any other observables from studies of early-type dwarfs and are thus an important step towards a better understanding of their formation.
Starbursts in Dwarfs triggered by Interactions *
T. J. Cox
PDF/PPT
- What causes dwarf starbursts?
- Feedback and hyrdodynamics of minor mergers and tidal dwarfs
The Role of Starbursts in Dwarf Galaxy Evolution
Robert Kennicutt
PDF/PPT
- Differnces between starbursts in dwarfs and normal galaxies
- What impact do starbursts have on dwarf galaxy evolution?
- Observational evidence for starburst phases
Why do Dwarfs host Superstar Clusters?
Kelsey Johnson
PDF/PPT
- The impact of SSCs
- Why can they form in dwarfs
- Is their frequency in dwarfs higher than in spirals?
- Connections to globular clusters
- Dispersion timescales
The relation between Dwarf Galaxies and Globular Clusters
J. Lotz
- Could globular clusters be remnants of stripped dwarfs?
- Observational evidence for stripping scenario?
Star Formation in Low Gravitational Potentials
Deidre Hunter
PDF/PPT
- What are the differences in SF between dwarfs and spirals
- Comparisons between BCDs, Irregulars, and dSph
- Do we have evidence for propagating SF in dwarfs?
Deep Nearby Surveys: a Complete Census of Dwarf Galaxies?
Janice Lee
- Latest results on dwarf galaxies from 11HUGS and KISS
- The luminosity function of dwarfs in a complete sample
- Internal relations (SFR vs. masses, metallicities, etc)
Linking Gas and Star Formation in Low Mass Systems
Leo Blitz
PDF/PPT
- Prescriptions for star formation
- Applicability to low mass systems
- Limits of the observations
- Are there failed dwarf galaxies?
The DART survey of the Fornax Dwarf Spheroidal Galaxy using VLT/FLAMES
Giusseppina Battaglia
As part of the DART project we have used the ESO Wide Field Imager (WFI) in conjunction with the VLT/FLAMES spectrograph to study the properties of the resolved stellar population of the Fornax dwarf spheroidal galaxy out to and beyond its tidal radius. We have spectra in the CaII triplet wavelength region for 562 stars which have velocities consistent with membership in Fornax dSph. We have found evidence for the presence of at least three distinct stellar components: a young population (few 100 Myr year old) concentrated in the centre of the galaxy, visible as a Main Sequence in the Colour-Magnitude Diagram; an intermediate age population (1-5Gyr old) and an ancient population (> 10Gyr). The two older components are represented in our spectroscopic sample of Red Giant Branch stars and we can also distinguish these populations in the spatial distribution of the stars found on the Red Giant Branch and the Red Clump/Horizontal Branch. There is evidence that both the few Myr old stellar population and part of the ancient population in Fornax are unrelaxed, suggesting that in part their formation was the result of some externally triggered event, perhaps a merger of another galaxy or other means of gas accretion.
Massive Star Feedback and the Violent ISM in Dwarfs *
David Strickland
- Impact of starburst on ISM
- X-ray observations: dwarfs vs.massive starbursts
- How many metals can be released to the IGM?
- Can this be a dominant process for IGM enrichment?
Magnetic Fields in Dwarf Galaxies
Uli Klein
PDF/PPT
- What role do magnetic fiels play in dwarfs? (IC10, N6822)
- What are the differences to spirals
- Are dwarfs disproportionally faint in their radio continuum?
Dwarf galaxies in galaxy clusters
Chris Conselice
PDF/PPT
- Overview of dwarf galaxies in clusters
- Comparison to 'field' dwarfs
- Are cluster dwarfs recycled galaxies?
Dwarf Galaxies in the Ultraviolet
David Schiminovich
PDF/PPT
- New results from GALEX
- GANGS: the Galex Nearby Galaxy Survey
- Differences between dwarfs and spiral galaxies
- Is there a relationship between HI holes and extended UV emission?
UV Diagnostics of Feedback
Charles Hoopes
PDF/PPT
- What have we learned from FUSE observations of dwarfs?
- How do UV absorption spectra in dwarfs and spirals differ
- The role of starbursts
- FUSE results on H_2 in dwarfs? Is this in conflict with CO observations?
- GALEX observations of M82
Star formation processes in dwarfs *
Bruce Elmegreen
- Do we expect variations in the IMF at low metallicities?
- Turbulence and its dependency on metallicity
- Compact star clusters in dwarfs
What is the IMF in Dwarfs? *
Claus Leitherer
PDF/PPT
- Can we use dwarfs as templates for high-z galaxies?
- Stellar populations in dwarfs
- Do we have evidence that the IMF is a function of metallicity
- Frequency of superstar clusters in dwarfs vs. spirals
- Do we have a good handle on models for low metallicities?
Star Formation in Dwarfs and the Pollution of the IGM *
Evan Scannapieco
PDF/PPT
- Stellar feedback
- Is the contribution of dwarfs to IGM enrichment significant?
- Supression of dwarf galaxy formation
Global and Small-Scale Feedback from Star Formation
Daniela Calzetti
PDF/PPT
- Nonradiative ionization processes: dwarfs vs. spirals
- What is the fraction of nonphotoionized gas in dwarfs?
- Differences between dwarfs and normal spirals (e.g., M83)
ACS and FUSE Results on Star-Forming Dwarf Galaxies with Extreme Properties of Cosmological Relevance
Alessandra Aloisi
PDF/PPTI will report results of several studies of nearby star-forming dwarf galaxies that I have recently undertaken with the ACS camera on HST and with the FUSE satellite. In three separate HST/ACS programs I am studying star-forming dwarf galaxies with particularly extreme properties, namely SBS1415+437, IZw18 and NGC4449. Deep broad-band imaging yields high-quality color-magnitude diagrams (CMDs) of the resolved stars that can be used to infer the star formation history (SFH), as well as the distance through the TRGB-method or Cepheid variability. Chemically-unevolved systems like IZw18 or SBS1415+437, represent the closest analog to primordial galaxies in the early universe and, as such, offer the best place where to study star formation in a pristine environment. Some of these objects could also turn out to be "young" galaxies in the local universe (e.g., the controversial case of IZw18), but our HST/ACS results so far do not support this interpretation. Global starbursts like NGC4449 have a widespread star-formation activity. We can study the SFH of this galaxy and its connection to the galaxy interaction that triggered it directly from our data. Galaxies like this closely resemble Lyman Break galaxies at high redshift (z~3), and represent the perfect laboratory where to characterize the effects of those processes (e.g., merging and accretion) intimately connected to the formation and evolution of galaxies in the early universe. With FUSE I am characterizing the ISM of dwarf and starburst galaxies of various kinds (including, e.g., IZw18 and NGC4449). The far-UV absorption lines yield metal abundances that can be directly compared to those inferred from HII regions. We find that the metal abundances of the neutral ISM are generally several times lower than those in the H II regions, indicating that the latter are enriched and cannot be used as a fair tracer of the ISM metallicity.
The conditions of the ISM in a Low-metallicity environment *
Karl Gordon
- What is the difference between the high and low-metallicity ISM from a theoretical perspective?
- Expectations for dust and PAH features in low-metallicity systems
- What have we learned from dwarf studies so far?
HI in Dwarf Galaxies
Elias Brinks
PDF/PPT
- Can we explain the HI structure?
- Evidence for impacti of massive SF: holes or artifacts?
- HI dispersions: why the same in dwarfs and spirals?
- are our estimates on HI scale heights correct/reasonable?
- the prospects of HIALPHA/SKA
Cold dust in dwarf galaxies
Frank Israel
PDF/PPT
- Summary of SCUBA and MAMBO observations
- Is there an enhancement in the small grain emission?
- Estimates of dust mass, and X_CO modeling of the emission
- Does the dust/gas ratio differ with respect to larger galaxies?
Molecular Gas in Dwarfs
Adam Leroy
PPT
- Single dish and interferometric CO results
- The relationship between star formation, radio emission, and FIR emission in dwarfs
- Do we trace all of the H2 with CO?
- Promise of new interferometers: CARMA and ALMA
New Spitzer views on dwarf irregular galaxies
Fabian Walter
PDF/PPT
- Is the dust distributed as expected?
- Implied dust masses
- Is the L_FIR similar to 'scaled-down' spirals?
- Are dust temperatures the same as in normal spirals?
The SMC: Tying Together Dust, Star Formation, and the Molecular Gas
Alberto Bolatto
PDF/PPT
- Overview: SMC, the nearest low-metallicity system
- Summary of gas observations
- What do we learn from the new Spitzer data?
Infrared Spectroscopic Diagnostics from Spitzer
J. D. Smith
- Is there a metallicity cutoff for PAH emission?
- Is it due to sensitivity or true lack of PAHs?
- Other diagnostic lines
- What modeling remains to be done?
Spectral Engergy Distribution and PAH emission in Blue Compact Dwarf Galaxies
Yanling Wu
PDF/PPTBlue Compact Dwarf galaxies (BCD) are a group of extra galactic objects with blue optical color, small size and low metallicity. Often considered to be local examples of the building blocks in the early universe, BCDs provide a unique laboratory to study the star formation in primodial galaxies. Early observation of four BCDs using Infrared Space Observatory (ISO) have already revealed the presence of dust embedded sources as well as ionic line emission in their spectra. The unprecedented sensitivity of the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope allows us for the first time to study a large sample of BCDs, obtaining both mid-IR imaging and spectra. We analyzed the abundance of the Polycyclic Aromatic Hydrocarbon (PAH) and investigated its correlation with various physical parameters. We also obtained optical spectra for a large portion of our BCDs to probe the optical-to-infrared spectral energy distribution in low metallicity environment. We will present the preliminary results of our findings.
The Luminosity Function of Dwarfs at z>0
Mauro Giavalisco
PDF/PPT
- How far back in time can we 'see' dwarfs?
- Changes in the luminosity function with respect to the local
- Prospects for future surveys of dwarfs at high z
Evidence for Minor Mergers at z>0
Eric Bell
PDF/PPT
- Evidence for minor mergers in GEMS, COMBO-17, and other deep surveys
- Is there evidence for merging dwarf galaxies?
- Constraints on masses of mergers
The optical-to-radio SEDs of BCDs
Leslie Hunt
- What makes a BCD?
- Relation to dwarf irregulars and ellipticals
- What distinguishes them from normal starbursts?
Searches in HI and the Low Mass End of the Luminosity Function
Martin Zwaan
- Searches for the faintest dwarfs
- The cosmological mass density of HI
- Cutoff in the low-mass end of mass function: evidence and expectations
- Optical follow-up of faintest sources (e.g., SINGG)
- The future: HIALPHA, SKA
What Do We Learn from Tidal Dwarfs
Pierre-Alain Duc
PDF/PPT
- Differences between normal and tidal dwarfs
- Are tidal dwarfs important in a cosmological context?
- How many of today dwarfs are of tidal origin?
- Top-down scenarios for massive TDG
- Is there evidence for dark matter in TDGs?
The Faintest Dwarfs Around M31 and Other Nearby Galaxies
Daniel Zucker
PDF/PPT
- Are these some of the missing satellites?
- A complete picture of stellar streams around M31
- Pushing the observational limits
Nearfield Cosmology *
Julio Navarro
PDF/PPT
- What evidence do we have that lower mass systems have built up the Milky Way?
- How do studies of nearby dwarfs help understand the hierarchical build-up of our Galaxy?
Are There Dark Galaxies?
Josh Simon
PDF/PPT
- The HI cloud near the dwarf galaxy LGS3
- Searches for stars in HVCs
- HI mapping of other HVCs
The Origins of the Mass-Metallicity Relation
Christy Tremonti
- Why do dwarfs have low metallicities?
- The 'outflow' vs. the 'young systems' scenarios
The origin of a giant tidal stream remnant in Virgo: clues on the shape of the Milky Way dark matter halo
David Martinez-Delgado
We present a deep color-magnitude of a field centered in the Virgo Stellar Stream that shows a conspicuos main-sequence turn-off feature, consistent with the presence of a metal-poor stellar population at D~ 20 kpc and in excellent agreement with the data derived from RR Lyrae variable stars and main-sequence turnoff stars in previous studies. We show that the most recent N-body models of the Sagittarius tidal stream predict two crossing tails at this position, naturally explaining the following over-density features: (i) the vertical structure and extension of the giant overdensity of main-sequence stars reported by Juric and co-workers (extending over ~1000 deg2 in the sky) would correspond to the leading arm falling onto the Galaxy plane, (ii) the over-density of RRLyr stars at D~20 kpc (12.4h RR Lyrae clump) with possitive radial velocity would correspond to trailing tail debris. Neither the geometry nor the kinematics of those detections can be explained by N-body models of the Sagittarius stream if the Galaxy dark matter halo has a prolate shape. In that case, Virgo would be the best example of a the giant surviving tidal debris of an unknown satellite disrupted during the evolution of the Milky Way predicted by the Cold Dark Matter theory.
Dynamics of Dwarf Ellipticals
Marla Geha
PDF/PPT
- The resolved internal kinematics of dEs
- Environmental dependencies
- Statistics of rotating dEs
- Differences between rotating and non-rotating dEs
- Dark matter contents? How do they compare to GCs?
The Status of Dark Matter Observations in Dwarf Galaxies
Erwin de Blok
- Is there a small-scale CDM crisis?
- If so, what are possible solutions to this?
- Have DM studies been pushed to faintest dwarfs?
The promise of New Instruments and Observatories
Jay Gallagher
PDF/PPT
- For which problems do we need bigger telescopes?
- Do we need bigger samples? other wavelengths?
Where do we go from here?
Robert Kennicutt
- Summary talk
- Were there 'unexpected' results in the last 5-10 years?
- What does the future hold?
