CERIN AMROTH · RESEARCH

LRD Watch DR1 · catalog object

LRDW J021709.47-051611.3

catalogTENTATIVEBH* channelUDS (PRIMER)
RA 02:17:09.476 34.2894844°
Dec −05:16:11.39 -5.2698313°
SIMBAD within 2″ · ESASky

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
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

11.52345710152010301003001000300020003000400050006000800010000150002000030000Balmer limitrest frame (Å) at z = 3.805, spectroscopicobserved wavelength (µm)flux density (nJy)
  • NIRCam wide
  • NIRCam medium
  • MIRI
  • 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 = 3.805.

At a glance

Tier
TENTATIVE
Found by
BH* channel
Redshift
3.805 DJA grade 3, PRISM
Spectral shape
not V-shaped de Graaff+25 criteria
F444W
23.01 AB S/N 259, 0.16″ aperture
F277W − F444W
not in the colour lane
BH* share
0.61 cliff_degraaff25; Δχ² galaxy 104.2, dwarf 276.0
Compactness
growth ratio 2.168 stars 2.327
Balmer break
3.15 ± 0.09 F200W/F162M, clean
Image vetting
half-stack pass; 1 flag(s)
Literature
0 catalogue(s), 1 AGN paper(s) within 0.108″

Vetting

  • Image vettingnot applicable
  • Half-stack testpass
  • Artifact riskflagged
  • Neighbournone
  • Extendedno
  • BH* channelBH* share 0.62 below 0.8 (composite)
  • BH* channelartifact-risk low-coverage n_exp=2 < 3 (F444W)

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).

ColumnWhat it iszSource
z_specSpectroscopic, DJA grade 33.8047glazebrook-v4_prism-clear_2565_2076.spec.fits
z_vetAdopted by vetting3.8047zspec:dja_specz_grade3.csv:2076
z_photPhotometric (P(z) peak)—not fitted
z_bhsBH* channel fit3.233cliff_degraaff25
z_agnColour-lane fit——

Spectral checks

V-shape (spectrum)
not V-shaped
Star (spectrum)
no
V-shape (photometry)
not measurable βUV not measured, βopt not measured at z_agn
Line in F410M
none 5 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.

  • 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.

BandInstrumentPivot (µm)f (nJy)σ (nJy)AB magS/NAp. corr.
F090WNIRCam wide0.90282.5511.0526.617.51.17
F115WNIRCam wide1.154120.1210.0526.2012.01.13
F140MNIRCam medium1.405201.597.8925.6425.61.13
F150WNIRCam wide1.501257.408.6425.3729.81.12
F162MNIRCam medium1.627295.737.5825.2239.01.11
F182MNIRCam medium1.845667.286.8324.3497.71.10
F200WNIRCam wide1.989932.909.6823.9896.41.13
F210MNIRCam medium2.0951058.339.1323.84115.91.10
F250MNIRCam medium2.5041327.1811.3223.59117.21.18
F277WNIRCam wide2.7621421.728.0623.52176.41.29
F300MNIRCam medium2.9901733.458.8923.30194.91.22
F356WNIRCam wide3.5681933.288.5223.18227.01.33
F360MNIRCam medium3.6241897.748.7923.20215.81.24
F410MNIRCam medium4.0822160.2014.3823.06150.21.34
F444WNIRCam wide4.4042264.438.7523.01258.81.38
F460MNIRCam medium4.6302361.0415.3022.97154.31.32
F770WMIRI7.6361120.1521.3423.7852.52.81
F1800WMIRI17.970621.41149.7024.424.24.42

Provenance

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

Image sources

BandMosaicNative pixelCoverage
F090Wjw01837-o008_t010_nircam_clear-f090w_i2d.fits0.031″1.00
F115Wjw01837-o008_t010_nircam_clear-f115w_i2d.fits0.031″1.00
F150Wjw01837-o008_t010_nircam_clear-f150w_i2d.fits0.031″1.00
F200Wjw01837-o008_t010_nircam_clear-f200w_i2d.fits0.031″1.00
F277Wjw01837-o008_t010_nircam_clear-f277w_i2d.fits0.063″1.00
F356Wjw01837-o008_t010_nircam_clear-f356w_i2d.fits0.063″1.00
F410Mjw01837-o008_t010_nircam_clear-f410m_i2d.fits0.063″1.00
F444Wjw01837-o008_t010_nircam_clear-f444w_i2d.fits0.063″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 J021709.47-051611.3.

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.