LRD Watch DR1 · catalog object

LRDW J100021.73+022253.7

catalogTENTATIVEcolour laneCOSMOS (PRIMER)

RA 10:00:21.735 150.0905638°

Dec +02:22:53.76 2.3815997°

SIMBAD within 2″ · ESASky

Images

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 — 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. No coverage in F090W, F115W, F150W.

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 = 6.989.

At a glance

Tier: TENTATIVE
Found by: colour lane
Redshift: 6.989 DJA grade 3, grating
Spectral shape: no PRISM spectrum de Graaff+25 criteria
F444W: 25.12 AB S/N 58, 0.16″ aperture
F277W − F444W: 1.02 mag strict redness
BH* share: not in the BH* channel
Compactness: FWHM 0.203″
Balmer break: 1.13 ± 0.08 F360M/F200W, blue:far-uv
Image vetting: half-stack pass; 1 flag(s)
Literature: 0 catalogue(s), 1 AGN paper(s) within 0.007″

Vetting

Image vettingnot applicable
Half-stack testpass
Artifact riskflagged
Neighbournone
Extendedno

colour laneartifact-risk low-coverage n_exp=2 < 3 (F410M)

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	6.9894	bluejay-north-v4_g140m-f100lp_1810_19945.spec.fits
`z_vet`	Adopted by vetting	6.9894	zspec:dja_specz_grade3.csv:19945
`z_phot`	Photometric (P(z) peak)	—	not fitted
`z_bhs`	BH* channel fit	—	—
`z_agn`	Colour-lane fit	7.08	AGN-inclusive templates

Spectral checks

V-shape (spectrum): no PRISM spectrum
Star (spectrum): no
V-shape (photometry): not measurable β_UV not measured, β_opt 2.31 at z_agn
Line in F410M: Hb, OIII 1 line-free optical band(s)
Line-ambiguous: yes
Settling verdict: not evaluated

Literature

Published objects within 1″ of this position. A match is a positional recovery, not an adopted classification.

Baccus+2026 (DJA census) 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.
F200W	NIRCam wide	1.989	112.04	2.51	26.28	44.7	1.09–1.11
F212N	NIRCam wide	2.121	99.47	22.94	26.41	4.3	1.14
F277W	NIRCam wide	2.762	127.78	4.33	26.13	29.5	1.20
F300M	NIRCam medium	2.990	164.12	9.08	25.86	18.1	1.22
F356W	NIRCam wide	3.568	219.42	4.38	25.55	50.0	1.24
F360M	NIRCam medium	3.624	125.47	8.06	26.15	15.6	1.24
F410M	NIRCam medium	4.082	584.04	9.43	24.48	62.0	1.26
F444W	NIRCam wide	4.404	326.45	5.62	25.11	58.1	1.27

Provenance

Field: COSMOS (PRIMER) (cosmos)
Programmes: 01837, 02321, 07814 behind every mosaic the field measured
Pipeline rows merged: 2 all at one position
Detection pass: original
Release build: 33af9933d1cc 2026-10-17T14:29:44Z

Image sources

Band	Mosaic	Native pixel	Coverage
F200W	`jw02321-o002_t001_nircam_clear-f200w_i2d.fits`	0.031″	1.00
F277W	`jw01837-o003_t003_nircam_clear-f277w_i2d.fits`	0.063″	1.00
F356W	`jw01837-o003_t003_nircam_clear-f356w_i2d.fits`	0.063″	1.00
F410M	`jw01837-o003_t003_nircam_clear-f410m_i2d.fits`	0.063″	1.00
F444W	`jw01837-o003_t003_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 J100021.73+022253.7.

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.