DRAFT
2022-12-02 18:41:59
Type: Object/s-Discovery/Classification
Bibcode: 2022TNSAN.257....1C
Transient Candidates in JWST DD NIRCam Imaging of Abell 2744 Galaxy-Cluster Field
Authors: Wenlei Chen (UMN), Patrick Kelly (UMN), Marco Castellano (INAF - Osservatorio Astronomico di Roma), Jose Diego (IFCA, CSIC-UC), Lei Hu (Purple Mountain Observatory), Justin Pierel (STScI), Tommaso Treu (UCLA), Lifan Wang (TAMU), Xin Wang (University of Chinese Academy of Sciences), Rogier Windhorst (Arizona State University), Adi Zitrin (Ben-Gurion University)
Keywords: Galaxy Cluster, Supernova, Microlensing
Abstract:
We report on the detection of two new transients in NIRCam imaging of the Abell 2744 galaxy-cluster field taken on October 20, 2022 (UT) by JWST DDT program 2756 (PI: Wenlei Chen). A first transient is detected in a host galaxy with redshift z=0.949. We identify a second candidate transient in a faint, gravitationally lensed arc with a photometric redshift of 2.7.

We report the detection of two transient candidates in JWST NIRCam observations of Abell 2744 by DDT program 2756 (PI: Wenlei Chen) acquired on October 20, 2022 (UT): AT2022acfu and AT2022acfv. These candidates were discovered by subtracting the DDT imaging data from the NIRISS pre-imaging taken from JWST ERS program 1324 (PI: Tommaso Treu). We constructed difference images between the NIRISS and NIRCam images, for which we convolved the high-resolution NIRCam images with transition kernels to match the NIRISS’s point spread functions. This technique has been introduced in Chen et al. 2022. These events have significant detection in multiple NIRCam filters. The first transient (RA=0:14:22.7512, DEC=-30:23:50.380) was detected in a galaxy at redshift z=0.949. The second transient candidate (RA=0:14:19.6589, DEC=-30:23:51.077) is detected in a faint arc, which has a photometric redshift of 2.7 (Castellano et al. 2016). Neither of these two transients is evident in the NIRISS pre-imaging taken in June 2022. 

Photometry of the targets (AB magnitudes):

AT2022acfu (10/20/2022 UT): F115W=26.32(0.02), F150W=26.40(0.04), F200W=26.37(0.05), F277W=27.01(0.18), F356W=27.47(0.14).

AT2022acfv (10/20/2022 UT): F115W=29.38(0.23), F150W=28.51(0.11), F200W=28.56(0.13), F277W=28.48(0.21), F356W=29.00(0.26), F444W=29.74(0.79).

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2022acfu 00:14:22.751 -30:23:50.38 0.949 0.949 00:14:22.751 -30:23:50.38 0.949
TNS 2022acfv 00:14:19.659 -30:23:51.08 2.7 2.7 00:14:19.567 -30:23:52.32 2.7
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