LRD Watch DR1 · candidate
LRDW J024017.84-013813.0
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
- BH* channel
- Redshift
- 7.97 BH* fit
- Spectral shape
- no labelled spectrum
- F444W
- 27.47 AB S/N 29, 0.16″ aperture
- F277W − F444W
- not in the colour lane
- BH* share
- 0.92 bhs_bb4200_b8; Δχ² galaxy 30.2, dwarf 2.1
- Compactness
- growth ratio 1.677 stars 2.384
- Balmer break
- 3.60 (lower limit) F360M/F300M, blue:2sig-limit
- Image vetting
- half-stack pass; no flags raised
- Literature
- no published match within 1″
Vetting
- Image vettingpassed
- Half-stack testpass
- Artifact risknone
- Neighbournone
- Extendedno
- BH* channelevidence dchi2_gal=30.2 dchi2_bd=2.1
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 | 7.9720 | bhstar:bhs_bb4200_b8 |
z_phot | Photometric (P(z) peak) | — | not fitted |
z_bhs | BH* channel fit | 7.972 | bhs_bb4200_b8 |
z_agn | Colour-lane fit | — | — |
Spectral checks
- V-shape (spectrum)
- no labelled spectrum
- Star (spectrum)
- no spectrum
- V-shape (photometry)
- not measurable βUV not measured, βopt not measured at z_agn
- Line in F410M
- none 3 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 | −1.95 | 3.32 | — | −0.6 | 1.30 |
| F090W | NIRCam wide | 0.902 | −1.39 | 2.06 | — | −0.7 | 1.31 |
| F115W | NIRCam wide | 1.154 | 2.98 | 2.12 | 30.21 | 1.4 | 1.33 |
| F140M | NIRCam medium | 1.405 | 5.80 | 4.11 | 29.49 | 1.4 | 1.32 |
| F150W | NIRCam wide | 1.501 | 4.73 | 1.85 | 29.71 | 2.6 | 1.34 |
| F162M | NIRCam medium | 1.627 | 3.65 | 4.00 | 30.00 | 0.9 | 1.32 |
| F164N | NIRCam wide | 1.645 | 21.33 | 28.98 | 28.08 | 0.7 | 1.27 |
| F182M | NIRCam medium | 1.845 | 2.12 | 2.31 | 30.59 | 0.9 | 1.35 |
| F187N | NIRCam wide | 1.874 | 4.75 | 26.28 | 29.71 | 0.2 | 1.23 |
| F210M | NIRCam medium | 2.095 | 3.04 | 2.63 | 30.19 | 1.2 | 1.36 |
| F250M | NIRCam medium | 2.504 | 0.13 | 3.46 | 33.62 | 0.0 | 1.44 |
| F277W | NIRCam wide | 2.762 | 2.69 | 1.06 | 30.32 | 2.5 | 1.47 |
| F300M | NIRCam medium | 2.990 | 2.70 | 2.16 | 30.32 | 1.2 | 1.46 |
| F335M | NIRCam medium | 3.362 | 5.99 | 1.65 | 29.46 | 3.6 | 1.49 |
| F360M | NIRCam medium | 3.624 | 15.58 | 1.51 | 28.42 | 10.3 | 1.50 |
| F410M | NIRCam medium | 4.082 | 28.30 | 1.67 | 27.77 | 17.0 | 1.53 |
| F430M | NIRCam medium | 4.281 | 38.73 | 3.63 | 27.43 | 10.7 | 1.53 |
| F444W | NIRCam wide | 4.404 | 37.24 | 1.30 | 27.47 | 28.6 | 1.58 |
| F460M | NIRCam medium | 4.630 | 40.37 | 4.36 | 27.39 | 9.3 | 1.56 |
| F480M | NIRCam medium | 4.816 | 45.95 | 4.15 | 27.24 | 11.1 | 1.57 |
Provenance
- Field
- Abell 370 (
a370x) - Programmes
01208, 03362, 06882behind 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 |
|---|---|---|---|
| F090W | jw01208-o020_t001_nircam_clear-f090w_i2d.fits | 0.031″ | 1.00 |
| F115W | jw01208-o020_t001_nircam_clear-f115w_i2d.fits | 0.031″ | 1.00 |
| F150W | jw01208-o020_t001_nircam_clear-f150w_i2d.fits | 0.031″ | 1.00 |
| 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 J024017.84-013813.0.
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.