JADES - NIRSpec - Data Release 4 Emission line flux tables ------------------------ RELEASE: v5.1.1 DATE: 27 February 2026 Description: Table of redshifts and emission line fluxes from JADES `Dark Horse' NIRSpec observations, obtained in `Dense Shutter Spectroscopy' (DSS) mode. These observations allow a high degree of spectral overlap and focus on emission-line science. Further details can be found in the Dark Horse paper (D'Eugenio et al. 2026), while the data reduction is described in the JADES NIRSpec Data Release 4 Paper II (Scholtz, Carniani et al. 2026). This table (jades_darkhorse_dr1_v0.5.1.fits) contains redshifts the following extensions: ##1: Obs_info ##2: R1000_5pix Extension 2 reports emission line fluxes measured from medium-resolution (R~1000) F170LP/G235M and F290LP/G395M observations. A more detailed description of the columns is given below. More details can be found in D'Eugenio et al. (2026), and in the JADES DR4 article (Scholtz, Carniani et al. 2026). ----------------------- Note on target IDs NIRCam_ID values are unique, but not all targets have a NIRCam_ID. ----------------------- ----------------------- Extension 1: Obs_info PID : Program ID of the observations TIER : Used to uniquely identify observations (see note on target IDs) NIRSpec_ID : ID used in the NIRSpec input target selection catalog (see note on target IDs) NIRCam_ID_DR5 : ID of the closest match within 0.2" in the JADES NIRCam data release 5 catalogue (Johnson and JADES collaboration at al.) ObsDate : Date of NIRSpec-MSA observations RA_TARG : Right Ascension of target as used for target allocation and pathloss correction [degree] Dec_TARG : Declination of target as used for target allocation and pathloss correction [degree] x_offset : Intra-shutter offset of the source in arcseconds, averaged over the multiple pointings y_offset : Intra-shutter offset of the source in arcseconds, averaged over the multiple pointings Field : A string denoting the target field. Priority : Priority class in target assignment process assigned_Prism : True if source observed with CLEAR/PRISM, False otherwise assigned_G140M : True if source observed with F070LP/G140M, False otherwise assigned_G235M : True if source observed with F170LP/G235M, False otherwise assigned_G395M : True if source observed with F290LP/G395M, False otherwise assigned_G395H : True if source observed with F290LP/G395H, False otherwise nDither_Pr : Number of dithers in CLEAR/PRISM nDither_Gr : Number of dithers in gratings nInt_Prism : Number of integrations (nods and dithers) for the CLEAR/PRISM observations. nInt_G140M : Number of integrations (nods and dithers) for the F070LP/G140M observations. nInt_G235M : Number of integrations (nods and dithers) for the F170LP/G235M observations. nInt_G395M : Number of integrations (nods and dithers) for the F290LP/G395M observations. nInt_G395H : Number of integrations (nods and dithers) for the F290LP/G395H observations. tExp_Prism : Total exposure time for the CLEAR/PRISM observations [s] tExp_G140M : Total exposure time for the F070LP/G140M observations [s] tExp_G235M : Total exposure time for the F170LP/G235M observations [s] tExp_G395M : Total exposure time for the F290LP/G395M observations [s] tExp_G395H : Total exposure time for the F290LP/G395H observations [s] z_Spec : Best spectroscopic redshift derived from NIRSpec observations z_Spec_flag : Redshift quality flag: A - highly robust, S/N>5 emission lines in R~1000 data B - highly robust, S/N>5 emission lines in Prism/Clear C - secure, visually identified from spectral breaks and/or low S/N emission lines D - tentative redshifts E - no redshift z_R1000 : Redshift determined from R1000 observations ----------------------- Extension 2 R~1000 gratings from 5-pixel boxcar extraction. ----------------------- Description of columns: ----------------------- PID : Program ID of the observations TIER : Used to uniquely identify observations (see note on target IDs) NIRSpec_ID : ID used in the NIRSpec input target selection catalog (see note on target IDs) NIRCam_ID : ID of the closest match within 0.2" in the JADES DR5 NIRCam data release catalogue (Robertson et al. 2026). Values of -9999 mean that no source exists within 0.2" (due to re-segmentation of the images). Values of -1111 indicate targets outside the NIRCam footprint. z_R1000 : Redshift derived from S/N>5 emission lines in the R~1000 grating spectra of this object (if applicable). [LineID]_flux : Measured emission line flux from the R~1000 spectra in units of x10^-20 erg s-1 cm-2. (See list of emission lines below) [LineID]_err : Uncertainty on measured emission lines flux [LineID]_SNR : SNR of the emission line measured [LineID]_filter: Grating/filter combination used to measure the flux. Note: There is typically spectral overlap between the G235M/F170LP and G395M/F290LP spectra. In cases where are prominent emission line falls in an overlapping region (and thus detected in two independent observations), we une the lowest-resolution observation (reddest grating) which has generally higher S/N. ----------------------------------------------------------- Disambiguation of emission line labels in the R~1000 table: ----------------------------------------------------------- C4_1549 : CIV 1548,1551 * C3_1907 : CIII] 1907,1909 * He2_1640 : HeII 1640 O3_1666 : OIII] 1660,1666 * O2_3727 : [OII] 3726, 3729 * Ne3_3869 : [NeIII] 3869 Ne3_3968 : [NeIII] 3968 HD_4102 : H-delta HG_4340 : H-gamma O3_4363 : [OIII] 4363 HB_4861 : H-beta O3_4959 : [OIII] 4959 O3_5007 : [OIII] 5007 He1_5875 : HeI 5875 O1_6300 : [OI] 6300 HA_6563 : H-alpha N2_6584 : [NII] 6584 S2_6718 : [SII] 6718 S2_6733 : [SII] 6733 S3_9069 : [SIII] 9069 S3_9532 : [SIII] 9532 PaD_10049 : Pa-delta He1_10829 : HeI 10829 PaG_10938 : Pa-gamma PaB_12818 : Pa-beta PaA_18751 : Pa-alpha * These doublets are not resolved into individual components.