AstroNote 2023-275

The JWST Advanced Deep Extragalactic Survey (JADES) obtained Cycle-1 NIRCam images of the GOODS-S field using 4 short-wavelength (SW) filters (F090W, F115W, F150W, and F200W) and 5 long-wavelength (LW) filters (F277W, F335M, F356W, F410M, and F444W) as part of program 1210 (Eisenstein et al. 2023, arXiv:2310.12340). The data were taken on UT 2022 October 20-24. The same portion of the GOODS-S field was re-observed on UT 2023 October 17 with NIRCam filters F162M, F182M, F210M, F250M, F300M, and F335M as part of Cycle 2 program 3215 (first epoch). Difference images could be directly created by subtracting the F335M images, and additional difference images were created by subtracting the program 1210 F200W image from the averaged 3215 F182M and F210M images. This worked because the combined transmission curves of F182M and F210M matched the F200W transmission curve very well, although caution was exercised to differentiate emission lines from real transients in the difference images. 

Seven supernovae were detected in these difference images. Below we list the position, photometry and likely host galaxy redshift for each of these sources. The information on the likely host galaxies was obtained either from SED modeling using the code EAZY (Brammer et al. 2008) or from publicly available catalogs, and all the reported magnitudes are in AB. The JADES collaboration has provided an interactive FITSMap (https://jades.idies.jhu.edu/public/) that allows users to interact with the NIRCam-detected galaxies in the GOODS-S field, which covers the 3215/1210 footprint. This resource can be used to view the reported likely host galaxies.

2023vnw (jades-gs-3215a) lies in the galaxy JADES-GS+53.06318-27.85748 (z_phot = 4.37 ± 0.03). It was discovered at position (03:32:15.1658, -27:51:26.918) (J2000) and has the following preliminary apparent magnitudes measured from the difference images:

(F182M+F210M)/2-(F200W) = 31.38 ± 0.87, F335M = 28.34 ± 0.04. The corresponding absolute magnitudes are -14.79 at 372 nm and -17.83 at 623 nm. 

Although the transient remains undetected in the F182M or F210M band, we confirm that the transient is detected in the F300M band. The F300M photometry is a subject of future work because there is no F300M data that can be used to produce a difference image.

2023vnx (jades-gs-3215b) lies in the galaxy JADES-GS+53.09468-27.86517 (z_phot = 4.89 ± 0.07). It was discovered at position (03:32:22.7507, -27:51:55.575) (J2000) and has the following preliminary apparent magnitudes measured from the difference images:

(F182M+F210M)/2-(F200W) = 31.47 ± 0.76, F335M = 28.76 ± 0.08. The corresponding absolute magnitudes are -14.89 at 339 nm and -17.61 at 568 nm. 

Although the transient remains undetected in the F182M or F210M band, we confirm that the transient is detected in the F300M band (29.21 ± 0.05; photometric measurement possible because this transient is well-separated from its host). We also caution that the separation between the transient and the proposed host galaxy is large (0.9”), and therefore the potential association is tentative.

2023vny (jades-gs-3215c) lies in the galaxy JADES-GS+53.09351-27.85004 (z_phot = 2.31 ± 0.08). It was discovered at position (03:32:22.4903, -27:51:00.128) (J2000) and has the following preliminary apparent magnitudes measured from the difference images:

(F182M+F210M)/2-(F200W) = 27.89 ± 0.03, F335M = 28.28 ± 0.07. The corresponding absolute magnitudes are -17.15 at 604 nm and -16.76 at 1012 nm.

2023vnz (jades-gs-3215d) lies in the galaxy JADES-GS+53.07798-27.85824 (z_spec = 0.6461 from Balestra et al. 2010, A&A, 512, 12). It was discovered at position (03:32:18.7891, -27:51:30.699) (J2000) and has the following preliminary apparent magnitudes measured from the difference images:

(F182M+F210M)/2-(F200W) = 26.58 ± 0.02, F335M = 27.53 ± 0.04. The corresponding absolute magnitudes are -15.81 at 1214 nm and -14.87 at 2035 nm.

2023voa (jades-gs-3215e) lies in the galaxy JADES-GS+53.06026-27.85754 (z_phot = 3.95). We note that the photometric redshift is very uncertain because of the faintness of the host galaxy, and the 16-84th percentile of z_phot distribution is 0.83 - 4.27. The transient was discovered at position (03:32:14.4674, -27:51:27.128) (J2000) and has the following preliminary apparent magnitudes measured from the difference images:

(F182M+F210M)/2-(F200W) = 28.91 ± 0.07, F335M = 30.09 ± 0.22. The corresponding absolute magnitudes are -17.09 at 404 nm and -15.91 at 676 nm.

2023vob (jades-gs-3215f) lies in the galaxy JADES-GS+53.09694-27.85057 (z_spec = 0.9640 from Vanzella et al. 2008, A&A, 478, 83). It was discovered at position (03:32:23.2953, -27:51:01.838) (J2000) and has the following preliminary apparent magnitudes measured from the difference images:

(F182M+F210M)/2-(F200W) = 25.96 ± 0.02, F335M = 26.67 ± 0.11. The corresponding absolute magnitudes are -17.31 at 1018 nm and -16.60 at 1705 nm.

2023voc (jades-gs-3215g) lies in the galaxy JADES-GS+53.07938-27.87085 (z_phot = 1.52 ± 0.04). It was discovered at position (03:32:19.1432, -27:52:14.504) (J2000) and has the following preliminary apparent magnitudes measured from the difference images:

(F182M+F210M)/2-(F200W) = 29.52 ± 0.15, F335M = 29.48 ± 0.11. The corresponding absolute magnitudes are -14.70 at 793 nm and -14.74 at 1329 nm.