LRD Watch DR1 · candidate
LRDW J041725.52-115038.1
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 + colour lane
- Redshift
- 6.92 colour-lane fit
- Spectral shape
- no labelled spectrum
- F444W
- 26.31 AB S/N 87, 0.16″ aperture
- F277W − F444W
- 1.47 mag strict redness
- BH* share
- 0.69 cliff_degraaff25; Δχ² galaxy 1.5, dwarf 115.6
- Compactness
- growth ratio 1.800 stars 2.354
- Balmer break
- 3.16 ± 0.55 F335M/F250M, 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
- BH* channelevidence dchi2_gal=1.5 dchi2_bd=115.6
- BH* channelBH* share 0.69 below 0.8 (composite)
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 | 6.9200 | z_agn |
z_phot | Photometric (P(z) peak) | — | not fitted |
z_bhs | BH* channel fit | 5.517 | cliff_degraaff25 |
z_agn | Colour-lane fit | 6.92 | AGN-inclusive templates |
Spectral checks
- V-shape (spectrum)
- no labelled spectrum
- Star (spectrum)
- no spectrum
- V-shape (photometry)
- passes βUV −1.37, βopt 0.40 at z_agn
- Line in F410M
- OIII 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 | 0.25 | 2.41 | 32.91 | 0.1 | 1.41–1.43 |
| F115W | NIRCam wide | 1.154 | 6.99 | 2.37 | 29.29 | 3.0 | 1.39–1.41 |
| F140M | NIRCam medium | 1.405 | −2.44 | 4.94 | — | −0.5 | 1.40–1.41 |
| F150W | NIRCam wide | 1.501 | 7.61 | 1.94 | 29.20 | 3.9 | 1.40–1.40 |
| F162M | NIRCam medium | 1.627 | 9.86 | 4.36 | 28.91 | 2.3 | 1.37–1.38 |
| F182M | NIRCam medium | 1.845 | 8.94 | 2.53 | 29.02 | 3.5 | 1.40–1.42 |
| F210M | NIRCam medium | 2.095 | 12.72 | 2.96 | 28.64 | 4.3 | 1.42–1.42 |
| F250M | NIRCam medium | 2.504 | 20.88 | 3.62 | 28.10 | 5.8 | 1.47–1.48 |
| F277W | NIRCam wide | 2.762 | 28.19 | 0.98 | 27.77 | 28.8 | 1.51–1.52 |
| F300M | NIRCam medium | 2.990 | 36.81 | 2.43 | 27.48 | 15.2 | 1.52–1.53 |
| F335M | NIRCam medium | 3.362 | 66.08 | 1.57 | 26.85 | 42.2 | 1.55–1.55 |
| F360M | NIRCam medium | 3.624 | 60.49 | 1.65 | 26.95 | 36.6 | 1.57–1.58 |
| F410M | NIRCam medium | 4.082 | 114.11 | 1.87 | 26.26 | 61.1 | 1.60–1.60 |
| F444W | NIRCam wide | 4.404 | 109.03 | 1.25 | 26.31 | 87.4 | 1.61–1.64 |
Provenance
- Field
- MACS J0417.5-1154 (
macsj04175,mj04175x) - Programmes
01208, 06882behind every mosaic the field measured- Pipeline rows merged
- 6 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 J041725.52-115038.1.
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.