LRD Watch DR1 · candidate
LRDW J041731.46-115008.8
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
- 3.097 DJA grade 3, PRISM
- Spectral shape
- inconclusive de Graaff+25 criteria
- F444W
- 25.17 AB S/N 214, 0.16″ aperture
- F277W − F444W
- not in the colour lane
- BH* share
- 0.91 cliff_degraaff25; Δχ² galaxy 24.9, dwarf 391.0
- Compactness
- growth ratio 1.719 stars 2.354
- Balmer break
- 2.65 (lower limit) F162M/F140M, 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
- 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 | 3.0971 | macs0417-v4_prism-clear_1208_202573.spec.fits |
z_vet | Adopted by vetting | 3.0971 | zspec:dja_specz_grade3.csv:202573 |
z_phot | Photometric (P(z) peak) | — | not fitted |
z_bhs | BH* channel fit | 3.184 | cliff_degraaff25 |
z_agn | Colour-lane fit | — | — |
Spectral checks
- V-shape (spectrum)
- inconclusive
- Star (spectrum)
- no
- V-shape (photometry)
- not measurable βUV not measured, βopt not measured at z_agn
- Line in F410M
- none 2 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. |
|---|---|---|---|---|---|---|---|
| F090W | NIRCam wide | 0.902 | 2.27 | 2.24 | 30.51 | 1.0 | 1.41–1.43 |
| F115W | NIRCam wide | 1.154 | 3.68 | 2.07 | 29.99 | 1.8 | 1.39–1.41 |
| F140M | NIRCam medium | 1.405 | 4.47 | 4.26 | 29.77 | 1.1 | 1.40–1.41 |
| F150W | NIRCam wide | 1.501 | 14.00 | 1.79 | 28.54 | 7.8 | 1.40–1.40 |
| F162M | NIRCam medium | 1.627 | 22.59 | 4.00 | 28.02 | 5.7 | 1.37–1.38 |
| F182M | NIRCam medium | 1.845 | 62.62 | 2.49 | 26.91 | 25.1 | 1.40–1.42 |
| F210M | NIRCam medium | 2.095 | 112.78 | 3.02 | 26.27 | 37.3 | 1.42–1.42 |
| F250M | NIRCam medium | 2.504 | 181.00 | 4.31 | 25.76 | 42.0 | 1.47–1.48 |
| F277W | NIRCam wide | 2.762 | 248.30 | 1.35 | 25.41 | 184.6 | 1.51–1.52 |
| F300M | NIRCam medium | 2.990 | 233.57 | 3.32 | 25.48 | 70.3 | 1.52–1.53 |
| F335M | NIRCam medium | 3.362 | 283.18 | 2.13 | 25.27 | 132.8 | 1.55–1.55 |
| F360M | NIRCam medium | 3.624 | 300.29 | 2.27 | 25.21 | 132.3 | 1.57–1.58 |
| F410M | NIRCam medium | 4.082 | 307.87 | 2.13 | 25.18 | 144.7 | 1.60–1.60 |
| F444W | NIRCam wide | 4.404 | 309.33 | 1.45 | 25.17 | 213.6 | 1.61–1.64 |
Provenance
- Field
- MACS J0417.5-1154 (
macsj04175,mj04175x) - Programmes
01208, 06882behind every mosaic the field measured- Pipeline rows merged
- 2 all at one position
- Detection pass
- original
- Release build
33af9933d1cc2026-10-17T14:29:44Z
Image sources
| Band | Mosaic | Native pixel | Coverage |
|---|---|---|---|
| F090W | jw01208-o026_t003_nircam_clear-f090w_i2d.fits | 0.031″ | 1.00 |
| F115W | jw01208-o026_t003_nircam_clear-f115w_i2d.fits | 0.031″ | 1.00 |
| F150W | jw01208-o026_t003_nircam_clear-f150w_i2d.fits | 0.031″ | 1.00 |
| F277W | jw01208-o026_t003_nircam_clear-f277w_i2d.fits | 0.063″ | 1.00 |
| F410M | jw01208-o026_t003_nircam_clear-f410m_i2d.fits | 0.063″ | 1.00 |
| F444W | jw01208-o026_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 J041731.46-115008.8.
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.