LRD Watch DR1 · candidate
LRDW J024019.53-013824.9
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 F200W, F356W.
Spectral energy distribution
- NIRCam wide
- NIRCam medium
- 2σ upper limit (S/N < 2)
At a glance
- Tier
- SILVER main class
- Found by
- colour lane
- Redshift
- 9.41 published
- Spectral shape
- no labelled spectrum
- F444W
- 27.88 AB S/N 20, 0.16″ aperture
- F277W − F444W
- 1.01 mag strict redness
- BH* share
- not in the BH* channel
- Compactness
- FWHM 0.178″
- Balmer break
- 2.19 ± 0.44 F410M/F360M, clean
- Image vetting
- half-stack pass; no flags raised
- Literature
- no 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 | 9.4100 | zpub:simbad.csv:CANUCS-2209594 [2024ApJ...966...74W] |
z_phot | Photometric (P(z) peak) | — | not fitted |
z_bhs | BH* channel fit | — | — |
z_agn | Colour-lane fit | 9.49 | AGN-inclusive templates |
Spectral checks
- V-shape (spectrum)
- no labelled spectrum
- Star (spectrum)
- no spectrum
- V-shape (photometry)
- passes βUV −1.85, βopt 0.23 at z_agn
- Line in F410M
- none 4 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.
- 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. |
|---|---|---|---|---|---|---|---|
| F070W | NIRCam wide | 0.704 | −0.37 | 4.47 | — | −0.1 | 1.30 |
| F090W | NIRCam wide | 0.902 | 1.92 | 2.76 | 30.69 | 0.7 | 1.31 |
| F115W | NIRCam wide | 1.154 | −0.12 | 4.28 | — | −0.0 | 1.33 |
| F140M | NIRCam medium | 1.405 | 26.86 | 6.92 | 27.83 | 3.9 | 1.32 |
| F150W | NIRCam wide | 1.501 | 12.07 | 2.61 | 28.70 | 4.6 | 1.34 |
| F162M | NIRCam medium | 1.627 | 8.26 | 8.65 | 29.11 | 0.9 | 1.32 |
| F164N | NIRCam wide | 1.645 | −3.61 | 50.43 | — | −0.1 | 1.27 |
| F182M | NIRCam medium | 1.845 | 14.36 | 3.23 | 28.51 | 4.5 | 1.35 |
| F187N | NIRCam wide | 1.874 | 57.74 | 35.03 | 27.00 | 1.6 | 1.23 |
| F210M | NIRCam medium | 2.095 | 18.96 | 5.47 | 28.20 | 3.5 | 1.36 |
| F250M | NIRCam medium | 2.504 | 12.05 | 3.51 | 28.70 | 3.4 | 1.44 |
| F277W | NIRCam wide | 2.762 | 10.06 | 1.11 | 28.89 | 9.1 | 1.47 |
| F300M | NIRCam medium | 2.990 | 11.47 | 2.22 | 28.75 | 5.2 | 1.46 |
| F335M | NIRCam medium | 3.362 | 10.17 | 1.68 | 28.88 | 6.1 | 1.49 |
| F360M | NIRCam medium | 3.624 | 8.35 | 1.53 | 29.10 | 5.5 | 1.50 |
| F410M | NIRCam medium | 4.082 | 18.22 | 1.62 | 28.25 | 11.3 | 1.53 |
| F430M | NIRCam medium | 4.281 | 21.62 | 3.52 | 28.06 | 6.1 | 1.53 |
| F444W | NIRCam wide | 4.404 | 25.62 | 1.28 | 27.88 | 20.0 | 1.58 |
| F460M | NIRCam medium | 4.630 | 26.05 | 4.32 | 27.86 | 6.0 | 1.56 |
| F480M | NIRCam medium | 4.816 | 31.28 | 4.20 | 27.66 | 7.5 | 1.57 |
Provenance
- Field
- Abell 370 (
a370x) - Programmes
01208, 03362, 06882behind every mosaic the field measured- Pipeline rows merged
- 2 all at one position
- Detection pass
- 2026-09 re-detection
- Release build
33af9933d1cc2026-10-17T14:29:44Z
Image sources
| Band | Mosaic | Native pixel | Coverage |
|---|---|---|---|
| F090W | jw01208-o020_t001_nircam_clear-f090w_i2d.fits | 0.031″ | 0.88 |
| F115W | jw01208-o020_t001_nircam_clear-f115w_i2d.fits | 0.031″ | 0.72 |
| F150W | jw01208-o020_t001_nircam_clear-f150w_i2d.fits | 0.031″ | 0.89 |
| F277W | jw01208-o020_t001_nircam_clear-f277w_i2d.fits | 0.063″ | 1.00 |
| F410M | jw01208-o020_t001_nircam_clear-f410m_i2d.fits | 0.063″ | 1.00 |
| F444W | jw01208-o020_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 J024019.53-013824.9.
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.