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2024 HotSci at JHU/STScI

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Colloquia

About Event

Wed 5 Jun 2024

Location

Space Telescope Science Institute (STScI)
3700 San Martin Drive
Baltimore, MD 21218

Time

3:00 PM - 4:00 PM EDT

Contact Information

Have questions? Please contact STScI.

Description

Featuring Tiger Hsiao (JHU) on A Comprehensive Study of the lensed galaxy MACS0647−JD at z=10.17 with JWST, Alec Hirschauer (STScI) on Star Formation at Low Metallicity: JWST results from imaging and spectroscopy, and Patrick Ogle (STScI) on How do AGN Feed Back?

Notes

All 2024 HotSci talks are held on Wednesdays at 3:00 PM. This series is hosted by STScI and will be held as an in-person and virtual event.

You may join in person at STScI’s John N. Bahcall Auditorium or virtually on STScI's Live Science Events Facebook page.

Please direct questions or comments to contact above. The 2024 HotSci Committee members are: Logan Jones (STScI), Sapna Mishra (STScI), Pallavi Patil (JHU), Adarsh Ranjan (STScI).

Special Talk

  • Speaker: Tiger Hsiao (JHU)
    Title: A Comprehensive Study of the lensed galaxy MACS0647−JD at z=10.17 with JWST
    Abstract: JWST has taken a giant leap towards unraveling the mystery of the first stars. We present new JWST NIRCam, NIRSpec, and MIRI observations of MACS0647−JD, the brightest z > 10 galaxy known, with 3 lensed images magnified by ~8, ~5.3, ~2.2. We find that MACS0647−JD consists of two components, possibly merging galaxies or star clusters within a single galaxy. We measure a spectroscopic redshift 𝑧=10.17 based on seven detected emission lines with NIRSpec prism, including the auroral line [O III] λ4363. Combining that spectroscopy with new [O III] λ5008 and Hα measurements from MIRI MRS, we present the first direct metallicity measurement at z>10: 12+log⁡(O/H)=7.79±0.09.

    Speaker: Alec Hirschauer (STScI)
    Title: Star Formation at Low Metallicity: JWST results from imaging and spectroscopy
    Abstract: We present an investigation of star-forming populations in nearby, metal-poor systems with JWST NIRCam and MIRI. These observing programs were designed to better characterize the star-formation mechanisms of early Universe like systems, in accessible conditions analogous to cosmic noon (z ~ 1.5-2), when such activity peaked. Our programs observed four local star-forming systems over a range of enrichment levels, including N79 in the LMC (Z ≈ 0.5 Z⊙), NGC 346 in the SMC (Z ≈ 0.3 Z⊙), NGC 6822 (Z ≈ 0.2 Z⊙), and I Zw 18 (Z ≈ 0.03 Z⊙), at a variety of wavelengths, providing spatially-resolved photometry of IR-bright sources at photometric depths over 10 magnitudes below Spitzer and 2 magnitudes below HST at comparable wavelengths.

    Speaker: Patrick Ogle (STScI)
    Title: How do AGN Feed Back?
    Abstract: AGN feedback is a crucial ingredient of galaxy simulations, needed to regulate and quench star formation in massive galaxies. However, the details of how it operates on the interstellar and circumgalactic media remain obscure. I will present recent JWST integral field spectroscopic observations that reveal the impact of AGN jets and outflows on the kpc-scale molecular, warm and ionized interstellar medium. The hope is to spark a discussion about future prospects for integrating these results into a more complete picture of AGN feedback and its impact on star formation.

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