0Assigned ID: 3429
----- Attempting Submission 1 (Fri Mar 25 19:10:50 GMT 2022) -----
HST Phase I Proposal 3429 successfully submitted.
Receipt: # 3429-1
----- Attempting Submission 2 (Fri Mar 25 23:15:09 GMT 2022) -----
HST Phase I Proposal 3429 successfully submitted.
Receipt: # 3429-2Editing WFC3 post flash from 20 e- to 15 e-.1670377754----- Attempting Submission 1 (Thu Jul 14 05:48:21 GMT 2022) -----
----- Attempting Submission 2 (Mon Oct 03 03:55:16 GMT 2022) -----Linking the UV Bump with PAHs in Low Metallicity Starburst II Zw 40We proposed to explore the connection between the 2175 angstrom UV bump and the Polycyclic Aromatic Hydrocarbons (PAHs) together with the cluster properties in a prototypical blue compact dwarf II Zw 40 using the FUV-NUV-optical filters F140LP, F225W, and F438W. The debate on what the carriers of the UV bump are is still unsettled, but PAH is one of the most plausible candidates. II Zw 40 has one of the highest star formation rate densities in the local Universe and has been found to exhibit strong 3.3 micron emission powered by the smallest PAHs. Our observation will take the advantage of the scheduled JWST GO1 program and use it as a supplement to showcase the combined power of the HST UV imaging and JWST IFUs to achieve our goal. Blue compact dwarf allows us to study starburst phenomena in the early Universe since they serve as powerful low-z, spatially resolvable analogs to high-z galaxies. Using HST multi-band imaging, we will constrain the strength of the UV bump and compare it with the spatially resolved dust properties in the IR revealed by JWST's IFUs. With our observation, we will also make possible a complete inventory of star clusters in II Zw 40 to further study cluster formation and evolution in this galaxy. There are existing archival HST UV data but they are not deep enough to meet our scientific objective. Our proposed program will obtain a much deeper UV mapping of II Zw 40 so that the amplitude of the UV bump can be better constrained. In total, we request 5 orbits of the HST observing time.HST images will be obtained using the ACS/SBC F140LP and WFC3/UVIS F225W and F438W filters. The exposure time for each filter is estimated using the HST ETC. For each filter, we use 4 point dithering with a post flash of 20 e-. The SED used in the ETC is 5 Myr old simple stellar population with Z_sun=0.4 from (Bruzual & Charlot, 2003). A set of the available HST archival data, including STIS F25QTZ and F25CN270 together with ACS F555W, is used to set the spectral normalize point for the exposure time estimation. The proposed observations will allow us to achieve a SNR>7 in the faintest clusters visible in the STIS image (see Sect. Justify Duplication for detail). We request 2 orbits in each of the F140LP and F225W filter to obtain deep UV images and 1 orbit for the optical filter F438W. Note that if these faint clusters are younger, their spectral energy distributions peak even higher in the bluer filters, and would be 1-2 magnitudes brighter than described above. In total, we request 5 orbits targeting II Zw 40 in this program.All team members are significantly involved in the Great Observatories All-Sky LIRG Survey (GOALS) collaboration, having extensive experience in the multi-wavelength study of starburst galaxies using ground-based and space-based facilities. Four members of the proposing team (Co-PI Dr.Armus, Dr. Evans, Dr. Linden, and Dr. Rich) have extensive experience reducing and analyzing HST imaging and spectroscopy data. All team members are also participating in the JWST ERS program 1328 - "A JWST Study of the Starburst-AGN Connection in Merging LIRGs.", with deep knowledge in interpreting IR science results.
Dr. Thomas Lai: Postdoctoral scholar research associate at IPAC.
Science interests: understanding how interstellar radiation fields impact dust properties in the ISM and exploring the impacts of star formation and AGN activity on the ISM properties. Experienced in spectroscopic analysis and spectra decomposition model development. The PI will take the lead design of the observations and will manage the data processing and analysis.
Dr. Sean Linden: Postdoctoral Fellow at the University of Massachusetts Amherst, who is an expert in breaking the age-reddening degeneracies in clusters using UV and optical data. Some of SL's star cluster relevant work have been published in papers (e.g., Linden +17, +21).
Dr. Lee Armus: Senior research scientist at IPAC. Lead scientist of IPAC WFIRST Science Support Center. The lead of the GOLAS team collaboration. The lead of the JWST ERS program #1328 to study four LIRGs with NIRSpec, NIRCAM, MIRI.
Prof. Aaron Evans: Professor of astrophysics at the University of Virginia and a staff member at NRAO in Charlottesville, VA. AE has led the major effort of the UV-to-optical HST program in the GOALS collaboration, and he is Co-PI of the JWST ERS 1328 program.
Dr. Jeff Rich: Staff at the Carnegie Institute of Science in Pasadena, CA. JR is an expert in using the multi-wavelength study to understand the properties of star-forming galaxies, AGN, and shock-excited galaxies.GalaxiesStellar Populations and the Interstellar Medium6falsefalsetruefalsefalsefalsefalseSUPPORTEDGALAXYSTARBURSTThis object was generated by the targetselector and retrieved from the SIMBAD database.J2000J2000ACS/SBCImagingNoNoF140LPWFC3/UVISImagingNoNoF225WWFC3/UVISImagingNoNoF438WPOS-TARGDITHER0.179LINE0.116falsefalse63.65420.02ACS-SBC-DITHER-BOX1falsePOS-TARGDITHER0.173LINE0.112falsefalse81.785423.884WFC3-UVIS-DITHER-BOX2false/Users/thomaslai/Documents/astro/prop/HST/cyc30_IIZw40/phaseII/OP-cache/IIZw40_cyc30_phseII_Resubmit_postflash-v01.xmlThe scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 17096
:visit-id "01"
:proposal-version -1
:trans-version "20220516"
:date "01-Oct-2022 08:07:54.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "28"
:si-bright-earth-limb-angle 20.0
:data-volume 74064
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 17096
:visit-id "01"
:obset-id "01"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 17096
:visit-id "01"
:orbit-number 1
:pcs-time 383
:si-vis-utilization 2741
:al-overhead-at-end 0
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 17096
:visit-id "01"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2700
:al-overhead-at-end 0
:internal-dur-at-end 117
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)true20/Users/thomaslai/Documents/astro/prop/HST/cyc30_IIZw40/phaseII/OP-cache/IIZw40_cyc30_phseII_Resubmit_postflash-v02.xmlThe scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 17096
:visit-id "02"
:proposal-version -1
:trans-version "20220516"
:date "01-Oct-2022 08:08:24.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1154976
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 17096
:visit-id "02"
:obset-id "02"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 17096
:visit-id "02"
:orbit-number 1
:pcs-time 383
:si-vis-utilization 2737
:al-overhead-at-end 125
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 17096
:visit-id "02"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2737
:al-overhead-at-end 125
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)true20/Users/thomaslai/Documents/astro/prop/HST/cyc30_IIZw40/phaseII/OP-cache/IIZw40_cyc30_phseII_Resubmit_postflash-v03.xmlThe scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 17096
:visit-id "03"
:proposal-version -1
:trans-version "20220516"
:date "01-Oct-2022 08:08:57.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1154992
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 17096
:visit-id "03"
:obset-id "03"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 17096
:visit-id "03"
:orbit-number 1
:pcs-time 383
:si-vis-utilization 2419
:al-overhead-at-end 125
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)true10