17627( 6) - 07-Aug-2024 14:26:28 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17627 Version: 6 Check-in Time: 07-Aug-2024 14:26:28 STScI Edit Number: 1 Title Origin and Feedback of a Giant Radio Galaxy in an Extreme Protocluster at z=2.3 ------------------------------------------------------------------------------------ Type Cycle GO 31 ------------------------------------------------------------------------------------ Investigators Contact? PI: Mingyu Li Tsinghua University Y CoI: Dr. Bjorn Emonts Associated Universities, Inc. Y CoI: Dr. Zheng Cai Tsinghua University Y CoI: Dr. Jianan Li Tsinghua University N CoI: Jianrui Li Tsinghua University N CoI: Prof. Xiaohui Fan University of Arizona N CoI: Dr. Jason X. Prochaska University of California - Santa Cruz N CoI: Prof. Nobunari Kashikawa University of Tokyo N CoI: Dr. Haibin Zhang Tsinghua University N CoI: Dr. Yongming Liang University of Tokyo, Institute of Cosmic N Ray Research CoI: Prof. Masami Ouchi National Astronomical Observatory of Japan N (NAOJ) CoI: Dr. Rhythm Shimakawa Waseda University N CoI: Dr. Maria Montserrat Villar Centro de Astrobiologia (CSIC/INTA) Inst. N Martin Nac. de Tec. Aero. CoI: Dr. Emmet Gabriel Golden-Marx Tsinghua University N CoI: Prof. Huub Rottgering Universiteit Leiden N CoI: Dr. Xin Wang Chinese Academy of Sciences N ------------------------------------------------------------------------------------ Abstract We propose deep VLA L-band imaging in A- and B-configuration to study the environment of radio galaxy J1348+24 at z=2.3, which has 550kpc radio lobes revealed by LOFAR. J1348+24 has the largest radio lobes identified at z>2 and is embedded in a giant nebula with multiphase CGM-scale emission, including Lya and CO. J1348+24 resides in an extremely massive galaxy overdensity, which contains the densest group of enormous Lya nebulae (ELANe) ever discovered. Nevertheless, power sources of these >100 kpc Lya emissions are missing in deep optical surveys. Our proposed observations aim to: (1) resolve the origin of the highest redshift giant radio lobes and study jet-induced feedback onto the host galaxy, combining the radio imaging with HST, ALMA, and optical IFU data; (2) measure obscured star-formation or AGN activity in the ELANe using the radio/FIR correlation, unraveling their mysterious powering. The wide VLA field-of-view allows us to image all seven ELANe in the protocluster in a single pointing. Additionally, complementary HST imaging is proposed to resolve the galaxy sub-components and map jet-induced star-formation. The proposed observations will provide new insights into feedback 17627( 6) - 07-Aug-2024 14:26:28 - [ 2] mechanisms in massive galaxy formation and the origin of the ELANe on scales even beyond the circumgalactic medium. ------------------------------------------------------------------------------------ Observations Description ------------------------ In this program, we obtain two orbits of WFC3-IR imaging for the radio galaxy and a few enormous Lyman-alpha nebulae located in an extreme protocluster. We plan to target two WFC3-IR pointings (visits) to cover two proposed targets (MLAN1 and MLAN3) with one-orbit integration time for each pointing. The F105W (Wide Y) band is planned to be used, which will take rest-frame UV (300 nm) wavelength for the proposed targets at redshift z=2.3. The coordinates of targets have been fine-tuned to the center of the detector, so any position angle (PA) is acceptable for both pointings. For each target, we use a standard 2-point WFC3-IR-DITHER-BLOB dither pattern and a sub-pattern of 2-point WFC3-IR-DITHER-LINE with NSAMP=13 to populate each orbit. The SPARS50 sampling sequence is used. These arrangements can make full use of each orbit, provide a half-pixel subsampling of the point-spread function (PSF) for each pointing, dither over the IR blob, and reject cosmic rays. We place target MLAN3 at the detecter optimum center (IR aperture) to observe the radio galaxy and MLAN1 at the detector geometric center (IR-FIX aperture) to include more protocluster member galaxies. ------------------------------------------------------------------------------------ 17627( 6) - 07-Aug-2024 14:26:28 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 MLAN3 GALAXY, HIGH REDSHIFT RA=13H48M36.3100S, J2000 V = 24 GALAXY, LYMAN ALPHA DEC=+23D59'40.70" CLOUD, RADIO GALAXY Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 2 MLAN1 GALAXY, HIGH REDSHIFT RA=13H47M54.5594S, J2000 V = 24 GALAXY, LYMAN ALPHA DEC=+23D58'17.29" CLOUD Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 17627( 6) - 07-Aug-2024 14:26:28 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BLOB WFC3-IR-DITHER-LINE Pattern_Purpose DITHER DITHER Number_Of_Points 2 2 Point_Spacing 5.183 0.636 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 41.859 41.788 Angle_Between_Sides Center_Pattern YES NO ------------------------------------------------------------------------------------------------------------------------------------ 17627( 6) - 07-Aug-2024 14:26:28 - [ 5] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 MLAN3 WFC3/IR MULTIAC IR F105W NSAMP=13, SAMP-SEQ=SPARS50 1 DEF PATTERN 1 1 CUM (2411.751 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ MLAN3 1 WFC3/IR MULTIAC IR F105W 1 1 none none 1 N/A CUM MLAN3 1 WFC3/IR MULTIAC IR F105W 1 2 none none 1 N/A CUM MLAN3 1 WFC3/IR MULTIAC IR F105W 2 1 none none 1 N/A CUM MLAN3 1 WFC3/IR MULTIAC IR F105W 2 2 none none 1 N/A CUM 17627( 6) - 07-Aug-2024 14:26:28 - [ 6] Visit: 02 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 MLAN1 WFC3/IR MULTIAC IR-FIX F105W NSAMP=13, SAMP-SEQ=SPARS50 1 DEF PATTERN 1 1 CUM (2411.751 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ MLAN1 1 WFC3/IR MULTIAC IR-FIX F105W 1 1 none none 1 N/A CUM MLAN1 1 WFC3/IR MULTIAC IR-FIX F105W 1 2 none none 1 N/A CUM MLAN1 1 WFC3/IR MULTIAC IR-FIX F105W 2 1 none none 1 N/A CUM MLAN1 1 WFC3/IR MULTIAC IR-FIX F105W 2 2 none none 1 N/A CUM 17627( 6) - 07-Aug-2024 14:26:28 - [ 7] Summary Form for Proposal 17627 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, IR-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=13, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F105W ------------------------------------------------------------------------------------------------------------------------------------ Target Names MLAN1, MLAN3 ------------------------------------------------------------------------------------------------------------------------------------