# LRDW J172146.79+654904.9 — Cerin Amroth Source: https://cerinamroth.com/jwst/lrds/dr1/j172146.79+654904.9/ [Home](https://cerinamroth.com/) › [JWST](https://cerinamroth.com/jwst/) › [Little red dots](https://cerinamroth.com/jwst/lrds/) › [LRD Watch DR1](https://cerinamroth.com/jwst/lrds/dr1/) › LRDW J172146.79+654904.9 LRD Watch DR1 · candidate # LRDW J172146.79+654904.9 candidate tableSILVERmain classBH* channelcolour laneNEP-TDF (PEARLS spoke GTO1) RA 17:21:46.797 260.4449889° Dec +65:49:04.99 65.8180517° [SIMBAD within 2″](https://simbad.cds.unistra.fr/simbad/sim-coo?Coord=260.444989++65.818052&Radius=2&Radius.unit=arcsec) · [ESASky](https://sky.esa.int/esasky/?target=260.444989%20+65.818052&fov=0.02&sci=true) ## Images F090W image, 3.2 arcsec across, north up F090W0.03″ px F115W image, 3.2 arcsec across, north up F115W0.03″ px F150W image, 3.2 arcsec across, north up F150W0.03″ px F200W image, 3.2 arcsec across, north up F200W0.03″ px F277W image, 3.2 arcsec across, north up F277W0.06″ px F356W image, 3.2 arcsec across, north up F356W0.06″ px F410M image, 3.2 arcsec across, north up F410M0.06″ px F444W image, 3.2 arcsec across, north up F444W0.06″ px Colour composite: F444W red, F356W green, F277W blue, 3.2 arcsec across, north up NE compositebar 1″ 3.2″ across, north up, east left, resampled from the deepest mosaic covering the object in each band; ticks mark the catalogue position. Each band is stretched on its own noise; the composite shares one flux scale, so its colour is real. ## Spectral energy distribution - NIRCam wide - NIRCam medium - 2σ upper limit (S/N < 2) Aperture fluxes in a 0.16″-radius circle, not corrected to total; the values are in the photometry table below. The gold line marks the Balmer limit (3646 Å rest) at z = 5.234. ## At a glance TierSILVER main class Found byBH* channel + colour lane Redshift5.23 photometric Spectral shapeno labelled spectrum F444W23.91 AB S/N 262, 0.16″ aperture F277W − F444W1.41 mag strict redness BH* share0.86 bhs_bb4200_b4; Δχ² galaxy 22.9, dwarf 75.9 Compactnessgrowth ratio 1.701 stars 2.108 Balmer break4.83 ± 0.31 F277W/F200W, red:Hb+OIII Image vettinghalf-stack pass; no flags raised Literatureno published match within 1″ ## Vetting - Image vettingpassed - Half-stack testpass - Artifact risknone - Neighbournone - Extendedno - No vetting notes. ## Redshifts Each redshift keeps its own column. Photometric redshifts of little red dots are unreliable: against spectra, about a third of AGN-template redshifts (`z_agn`; 31 of 95 in the last purity run) and about half of galaxy-template redshifts at z > 3 were catastrophic outliers (methods Section 8). | Column | What it is | z | Source | `z_spec` | Spectroscopic, DJA grade 3 | — | — | `z_vet` | Adopted by vetting | 5.2340 | pz:z_map | `z_phot` | Photometric (P(z) peak) | 5.234 | 68%: 4.882–5.355 | `z_bhs` | BH* channel fit | 5.286 | bhs_bb4200_b4 | `z_agn` | Colour-lane fit | 5.23 | AGN-inclusive templates ## Spectral checks V-shape (spectrum)no labelled spectrum Star (spectrum)no spectrum V-shape (photometry)passes βUV −1.09, βopt 2.04 at z_agn Line in F410MHa 1 line-free optical band(s) Line-ambiguousyes Settling verdictno extraction ## Literature Published objects within 1″ of this position. A match is a positional recovery, not an adopted classification. - No published JWST little red dot or broad-line AGN within 1″. ## Photometry Circular aperture of radius 0.16″ at each band's native resolution, background from a 0.40–0.65″ annulus, programmes combined by inverse variance. For a point source multiply by the field's aperture correction (r = 0.16″ → 0.70″). Grey rows are below S/N 2. | Band | Instrument | Pivot (µm) | f (nJy) | σ (nJy) | AB mag | S/N | Ap. corr. | F090W | NIRCam wide | 0.902 | 27.56 | 4.14 | 27.80 | 6.7 | 1.15 | F115W | NIRCam wide | 1.154 | 36.13 | 3.98 | 27.50 | 9.1 | 1.13 | F150W | NIRCam wide | 1.501 | 43.94 | 3.81 | 27.29 | 11.5 | 1.11 | F200W | NIRCam wide | 1.989 | 55.47 | 3.50 | 27.04 | 15.9 | 1.09 | F277W | NIRCam wide | 2.762 | 268.76 | 2.74 | 25.33 | 98.1 | 1.20 | F356W | NIRCam wide | 3.568 | 382.17 | 2.72 | 24.94 | 140.3 | 1.24 | F410M | NIRCam medium | 4.082 | 1447.96 | 7.01 | 23.50 | 206.7 | 1.26 | F444W | NIRCam wide | 4.404 | 989.12 | 3.78 | 23.91 | 261.6 | 1.28 ## Provenance FieldNEP-TDF (PEARLS spoke GTO1) (`cleannorthcvzmrsx`) Programmes`02738, 12529` behind every mosaic the field measured Pipeline rows merged3 all at one position Detection passoriginal Release build`33af9933d1cc` 2026-10-17T14:29:44Z ## Image sources | Band | Mosaic | Native pixel | Coverage | F090W | `jw02738-o001_t001_nircam_clear-f090w_i2d.fits` | 0.031″ | 1.00 | F115W | `jw02738-o001_t001_nircam_clear-f115w_i2d.fits` | 0.031″ | 1.00 | F150W | `jw02738-o001_t001_nircam_clear-f150w_i2d.fits` | 0.031″ | 1.00 | F200W | `jw02738-o001_t001_nircam_clear-f200w_i2d.fits` | 0.031″ | 1.00 | F277W | `jw02738-o001_t001_nircam_clear-f277w_i2d.fits` | 0.063″ | 1.00 | F356W | `jw02738-o001_t001_nircam_clear-f356w_i2d.fits` | 0.063″ | 1.00 | F410M | `jw02738-o001_t001_nircam_clear-f410m_i2d.fits` | 0.063″ | 1.00 | F444W | `jw02738-o001_t001_nircam_clear-f444w_i2d.fits` | 0.063″ | 1.00 ## Cite Anderson, Jordan (2026). LRD Watch DR1: little red dot candidates from an independent search of public JWST imaging (Version DR1) [Data set]. Cerin Amroth Research. Zenodo. https://doi.org/10.5281/zenodo.23062632 Object LRDW J172146.79+654904.9. CC BY 4.0. Please also acknowledge the JWST programmes that took the data. LRD Watch DR1 is a vetted candidate catalogue, not a complete census: it has no selection function and cannot on its own give number densities. [About the release](https://cerinamroth.com/jwst/lrds/dr1/). [← LRDW J172141.34+654959.0](https://cerinamroth.com/jwst/lrds/dr1/j172141.34+654959.0/)[LRDW J172150.87+654911.4 →](https://cerinamroth.com/jwst/lrds/dr1/j172150.87+654911.4/)