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Jan 20
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No talk scheduled.
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Jan 27 |
John Kormendy
University of Texas at Austin |
"Scaling Laws for Dark Matter Halos in Late-Type and Dwarf Spheroidal Galaxies"
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Feb 3 |
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No talk scheduled.
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Feb 10 |
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No talk scheduled.
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Feb 17 |
John Lacy, Steve and Keely Finkelstein, and Harriet Dinerstein (4 speakers)
University of Texas at Austin |
"Sharing Teaching Techniques and Tools"
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Feb 24 |
Martha Boyer
NASA Goddard (host: Kristen McQuinn) |
"The Key Influence of AGB Stars on the Evolution and Global Properties of Galaxies"
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Mar 2 |
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No talk scheduled.
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Mar 9 |
Amanda Kepley
National Radio Astronomy Observatory (NRAO) |
"Opening New Frontiers in the Study of Star Formation"
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Mar 16 |
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Spring Break: No talk scheduled.
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Mar 23 |
Joel Green
Space Telescope Science Institute (STScI) (host: Yao-Lun Yang) |
"Extreme Accretion: The Evolution of the FU Orionis Disk"
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Mar 30 |
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No talk scheduled
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Apr 6 |
Eric Becklin
University of California, Los Angeles (hosts: John Lacy, Dan Jaffe) |
"Stratospheric Observatory for Infrared Astronomy (SOFIA): Overview, the First Science Results, and Future Opportunities"
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Apr 13 |
Brendan Bowler
University of Texas at Austin (Hubble Fellow) |
"The Architecture, Atmospheres, and Origin of Giant Planets with High-Contrast Imaging"
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Apr 20 |
Anshu Gupta
Australian National University (host: Chao-Ling Hung) |
"Radial Distribution of Gas-Phase Metallicities of Galaxies in two CLASH Clusters at z ~ 0.35"
The radial distribution of metallicity of star-forming galaxies in a galaxy cluster can inform us about the mass assembly and enrichment history of the galaxy cluster. This paper presents observation of radial distribution of global metallicity of star-forming galaxies in two CLASH clusters. We present the first observation of radial distribution of cluster member metallicity in galaxy clusters. The two CLASH clusters, MACS1115+01 and RXJ1532+30, were observed with DEIMOS spectrograph at Keck-II telescope. Both galaxy clusters are cool-core clusters at redshift z approximately equal to 0.35. We identified 22 (14 - emission line galaxies) and 36 (21 - emission line galaxies) cluster members for MACS1115+01 and RXJ1532+30 respectively. ISM properties such as metallicity and ionization parameter, were estimated using emission line ratios [NII]/H Alpha, [NII]/[SII] and [OIII]/H Beta. The gas-phase metallicity of star-forming galaxies in MACS1115+01 exhibit anti-correlation with projected distance -0.15 +/- 0.08 dex/Mpc, whereas the radial metallicity distribution of RXJ1532+30 is statistically flat (-0.09 +/- 0.12 dex/Mpc). In addition, the mass-metallicity relation of MACS1115+01 has 0.2 dex offset metallicity than the local comparison sample, but the RXJ1532+30 mass-metallicity relation is statistically similar to the local comparison sample. The negative radial abundance gradient of MACS1115+01 suggests the impact of cluster environment via ram pressure stripping, strangulation on galaxy evolution. Our observations suggests towards the un-relaxed dynamical state of RXJ1532+30, which in turn explains the observed flat metallicity gradient of RXJ1532+30. We compare our metallicity gradient observations with the metallicity gradient in galaxy cluster simulations (Rhapsody-G) after matching with the concentration parameter. The star-forming galaxies in simulated cluster also exhibit a slight negative abundance gradient of -0.04 +/- 0.03 dex/Mpc, however the slope is significantly smaller than the observations.
close
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Apr 27 |
Postdoc Mentoring Commitee
University of Texas at Austin |
"Applying for Your Next Job"
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May 4 |
Linda Strubbe
University of British Columbia (host: Jeff Silverman) |
"Developing scientific reasoning: at UBC and in West Africa"
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