2014 Aug.6: HotSci Colloquium, STScI,
Title: The UV sky: the legacy of the GALEX surveys
Abstract: The Galaxy Evolution Explorer (GALEX) imaged the sky in the Ultraviolet (UV) for nine years, delivering the first sky surveys at these wavelengths. Its database contains far-UV (lambda_eff ~ 1528Ang) and near-UV (lambda_eff ~ 2310Ang) imaging of most of the sky, it includes over 200 million source measurements and deep UV maps of extended galaxies. The GALEX archive is a long-lasting resource for statistical studies of hot stellar objects, z<2 QSOs, star-forming galaxies, nebulae and the interstellar medium. It provides an unprecedented road-map for planning future UV instrumentation and follow-up observing programs in the UV and at other wavelengths.
I will present final science-ready catalogs and available tools, which facilitate scientific exploitation of the UV surveys. Among the science results uniquely enabled by these data, is the search for hot white dwarfs (WD). These stars are elusive at all wavelengths except the UV, owing to their hot temperatures and low optical luminosities. The GALEX unbiased census of of hot WDs, an increase by over two orders of magnitude over previously known samples, reveals this elusive component of the MW stellar populations out to several kpc, opening new ways to probe post-ABG evolution and to find types of binaries otherwise elusive. The hot-WD samples are analyzed with Milky Way models, and validated with HST follow-up observations, to clarify critical aspects of stellar evolution, such as the initial-final mass relation. The IFMR, which maps the WD mass to that of its main-sequence progenitor, is relevant for understanding the yield of chemical elements and galaxy evolution.
2014 June 24: Colloquium at SISSA, Trieste, Italy
Title: Stellar populations in nearby galaxies: a stepping stone for understanding the evolution of stars, galaxies, and our universe.
Abstract: Studies of young stellar populations in local galaxies, spanning a variety of environments and physical conditions, reveal the modalities of the star-formation process and the co-evolution of massive stars and dust. Massive stars drive the dynamical and chemical evolution of their host galaxy. Mapped across large portions of galaxies, they provide a precise time- and space- tomography of the young stellar populations, because of their fast evolutionary time-scales, revealing how gas and dust condense to form stars, and how local star-bursts evolve and dissolve with time.
The complementary capabilities of two recent space telescopes, GALEX and Hubble, have enabled substantial progress in this field. GALEX has provided unprecedented wide-field, sensitive views of young stellar populations across extended galaxies, has characterized star-formation down to very low levels, previously undetected, and measured the star-formation history of the universe up to redshift ~2. With Hubble, we are able to resolve the individual stellar constituents of nearby star-forming regions, and measure their physical parameters. The ensemble of results from such studies informs new-generation stellar and galaxy evolution models, which in turn underpin our interpretation of the integrated light from galaxies in the distant, younger universe, ultimately to unravel its evolution.
2014 May 14: Seminar at OAP Meudon, France
Title: The role of rest-frame UV data in studies of stellar populations : the legacy of GALEX and HST in the Milky Way and the local universe
2014 May: Invited Visiting Professor at O. A. Paris, F
2013 Oct. 7: Invited review at
NUVA Conference, Garching, Germany
Title: Review of GALEX results
2013 June: Invited Visiting Scientist, University of Padua, Italy
2013 Jan. 9: 221st AAS meeting, Long Beach, CA
Title: Characterizing the Content and Spatial Clustering of Hot Massive Stars in M31 from the PHAT Survey
2012 Sept. 4: GALEX-FEST, Pasadena, Invited talk
Title: A stellar legacy from the GALEX UV surveys: an unbiased census of hot white dwarfs to clarify stellar evolution
2012 Aug. 15, STScI Colloquium
Title: Hot stars and Dust in Local Group Galaxies
2012 July, COSPAR 2012, Mysore, India --- cancelled ---
Title: Results from the GALEX mission
2012 June , Princeton, Martin Schwarzschild Centennial Meeting "The Great Andromeda galaxy", Invited talk
Title: Young Stellar Populations and Star Formation in M31
2011, July, Tenerife, Spain;
IAU Symp. 283 "Planetary Nebulae: an Eye to the Future" (July 25-29, 2011), invited review:
Title: New Advances in the Field of Planetary Nebulae from Ultraviolet Observations
2010 June, Russian Academy of Sciences, St Petersburg, Russia, invited review at the conference "UV Universe 2010"
Title: ``GALEX and star formation"
2009 Dec.10- STScI, Baltimore
Title: Star formation in Local Group galaxies from low- and high-resolution multiband imaging (GALEX and HST)
2009 Aug. 19 - HIA-NRC, Canada
Title: Star Formation in the Local Group.
2009 June 19 - Univ. of Padua, Italy
Title: Star formation in the local universe and UV sky surveys.
2009 April 10 - Rutgers University
Title: Star Formation in the Local Universe
2007 Oct. 17 - at
"UV and X-Ray Science Planning for ASTROSAT" Montreal, CA
The UV sky: results from the GALEX surveys
2007 May 29 - Invited talk at
The UV Window to the Universe'' (El Escorial, SPAIN, May 29 - June 1 2007)
The Ultraviolet Sky Surveys: Filling the Crucial Gap in our View of the Universe
2006 Aug. - Invited talk at IAU General Assembly - JD 4 - Prague
``High mass stars: Stellar Populations''
2006 June 8, University of Trieste, Italy
Learning about Star Formation from the Local Universe
2006 March 23 - Colloquium at Yale Univ.
``The Ultraviolet Sky: Learning about Star Formation from the Local Universe''
2005 Apr. 28 - Colloquium at JHU
``The Ultraviolet Sky: results from the GALEX mission''
2005 Mar. 30 - U. Penn, Philadelphia
``The GALEX view of the local Universe''
2004 Oct. 11-13, - Invited Talk at the Conference
New windows on star formation in the cosmos
``Global Mapping of Milky Way Star Formation with GALEX''
2004 April 28 - talk at JHU
``GALEX sampler (of capabilities, images, results)''
2004 April 22 - colloquium at University of Delaware
"The Recent Star Formation: Early Results from GALEX UV surveys"
2004 Mar. 10 - talk at STScI
"Early Results from GALEX"