LRD Watch DR1 · catalog object
LRDW J123638.16+621536.7
Images
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. No coverage in F090W, F150W, F200W, F277W, F410M.
Spectral energy distribution
- NIRCam wide
- NIRCam medium
- 2σ upper limit (S/N < 2)
At a glance
- Tier
- TENTATIVE
- Found by
- BH* channel
- Redshift
- 4.169 DJA grade 3, PRISM
- Spectral shape
- V-shaped de Graaff+25 criteria
- F444W
- 25.26 AB S/N 71, 0.16″ aperture
- F277W − F444W
- not in the colour lane
- BH* share
- 0.64 bhs_bb4800_b8; Δχ² galaxy 0.8, dwarf 27.4
- Compactness
- growth ratio 1.898 stars 2.357
- Balmer break
- 1.90 ± 0.41 F210M/F115W, blue:far-uv
- Image vetting
- half-stack pass; no flags raised
- Literature
- 1 catalogue(s), 2 AGN paper(s) within 0.013″
Vetting
- Image vettingnot applicable
- Half-stack testpass
- Artifact risknone
- Neighbournone
- Extendedno
- BH* channelevidence dchi2_gal=0.8 dchi2_bd=27.4
- BH* channelBH* share 0.64 below 0.8 (composite)
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 | 4.1690 | diver-gdn-02-v4_prism-clear_8018_1029154.spec.fits |
z_vet | Adopted by vetting | 4.1690 | zspec:dja_specz_grade3.csv:1029154 |
z_phot | Photometric (P(z) peak) | — | not fitted |
z_bhs | BH* channel fit | 4.857 | bhs_bb4800_b8 |
z_agn | Colour-lane fit | — | — |
Spectral checks
- V-shape (spectrum)
- V-shaped
- Star (spectrum)
- no
- V-shape (photometry)
- not measurable βUV not measured, βopt not measured at z_agn
- Line in F410M
- none 0 line-free optical band(s)
- Line-ambiguous
- no
- Settling verdict
- not evaluated
Literature
Published objects within 1″ of this position. A match is a positional recovery, not an adopted classification.
- Rinaldi et al. (2024)
- Lin+2025 GOODS-N broad-line AGN
- Zhang+2025 broad-line AGN
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. |
|---|---|---|---|---|---|---|---|
| F115W | NIRCam wide | 1.154 | 21.30 | 3.61 | 28.08 | 5.9 | 1.33 |
| F182M | NIRCam medium | 1.845 | 34.52 | 4.36 | 27.55 | 7.9 | 1.35–1.44 |
| F210M | NIRCam medium | 2.095 | 40.55 | 5.53 | 27.38 | 7.3 | 1.37–1.46 |
| F356W | NIRCam wide | 3.568 | 272.30 | 3.57 | 25.31 | 76.2 | 1.31–1.52 |
| F444W | NIRCam wide | 4.404 | 284.65 | 4.02 | 25.26 | 70.9 | 1.51–1.58 |
Provenance
- Field
- GOODS-N (JADES 1181 with FRESCO, CONGRESS, GO 4762 and GO 6434) (
goods) - Programmes
01181, 01895, 02674, 02926, 03577, 04762, 05407, 06434behind every mosaic the field measured- Pipeline rows merged
- 1 all at one position
- Detection pass
- original
- Release build
33af9933d1cc2026-10-17T14:29:44Z
Image sources
| Band | Mosaic | Native pixel | Coverage |
|---|---|---|---|
| F115W | jw03577-o002_t002_nircam_clear-f115w_i2d.fits | 0.031″ | 1.00 |
| F356W | jw03577-o002_t002_nircam_clear-f356w_i2d.fits | 0.063″ | 1.00 |
| F444W | jw01895-o002_t004_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 J123638.16+621536.7.
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.