LRD Watch DR1 · catalog object
LRDW J100037.12+022100.8
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.
Spectral energy distribution
- NIRCam wide
- NIRCam medium
- MIRI
- 2σ upper limit (S/N < 2)
At a glance
- Tier
- SILVER main class
- Found by
- BH* channel + colour lane
- Redshift
- 6.628 DJA grade 3, PRISM
- Spectral shape
- inconclusive de Graaff+25 criteria
- F444W
- 27.47 AB S/N 15, 0.16″ aperture
- F277W − F444W
- 1.14 mag strict redness
- BH* share
- 0.74 bhs_bb4200_b4; Δχ² galaxy 1.1, dwarf −7.5
- Compactness
- growth ratio 1.779 stars 2.248
- Balmer break
- not measured
- Image vetting
- half-stack pass; no flags raised
- Literature
- 2 catalogue(s), 0 AGN paper(s) within 0.009″
Vetting
- Image vettingpassed
- Half-stack testpass
- Artifact risknone
- Neighbournone
- Extendedno
- BH* channeldwarf grid fits better (dchi2_bd=-7.5) but z_spec confirms
- BH* channelevidence dchi2_gal=1.1 dchi2_bd=-7.5
- BH* channelBH* share 0.74 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 | 6.6275 | cosmos-transients-v4_prism-clear_6585_59286.spec.fits |
z_vet | Adopted by vetting | 6.6275 | zspec:dja_specz_grade3.csv:59286 |
z_phot | Photometric (P(z) peak) | 7.935 | 68%: 4.626–8.675 |
z_bhs | BH* channel fit | 6.425 | bhs_bb4200_b4 |
z_agn | Colour-lane fit | 7.93 | AGN-inclusive templates |
Spectral checks
- V-shape (spectrum)
- inconclusive
- Star (spectrum)
- no
- V-shape (photometry)
- passes βUV −0.96, βopt 2.11 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.
- Kocevski et al. (2024)
- Leung et al. (2024)
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 | −0.46 | 6.39 | — | −0.1 | 1.15–1.15 |
| F115W | NIRCam wide | 1.154 | 2.33 | 6.04 | 30.48 | 0.4 | 1.12–1.13 |
| F140M | NIRCam medium | 1.405 | 3.10 | 14.78 | 30.17 | 0.2 | 1.11 |
| F150W | NIRCam wide | 1.501 | 11.35 | 4.97 | 28.76 | 2.3 | 1.11–1.11 |
| F200W | NIRCam wide | 1.989 | 15.20 | 4.23 | 28.45 | 3.6 | 1.09–1.11 |
| F250M | NIRCam medium | 2.504 | −4.42 | 7.83 | — | −0.6 | 1.18 |
| F277W | NIRCam wide | 2.762 | 13.08 | 2.10 | 28.61 | 6.2 | 1.20–1.21 |
| F300M | NIRCam medium | 2.990 | 5.46 | 3.53 | 29.56 | 1.6 | 1.22–1.23 |
| F356W | NIRCam wide | 3.568 | 27.54 | 1.96 | 27.80 | 14.1 | 1.23–1.24 |
| F360M | NIRCam medium | 3.624 | 25.03 | 5.81 | 27.90 | 4.3 | 1.24–1.25 |
| F410M | NIRCam medium | 4.082 | 18.43 | 3.55 | 28.24 | 5.2 | 1.26–1.27 |
| F444W | NIRCam wide | 4.404 | 37.34 | 2.49 | 27.47 | 15.0 | 1.27–1.28 |
| F460M | NIRCam medium | 4.630 | 28.27 | 13.08 | 27.77 | 2.2 | 1.32 |
| F770W | MIRI | 7.636 | 26.08 | 16.55 | 27.86 | 1.6 | 1.83 |
| F1280W | MIRI | 12.809 | 29.25 | 57.33 | 27.73 | 0.5 | — |
| F1500W | MIRI | 15.048 | 91.57 | 70.42 | 26.50 | 1.3 | 4.24 |
| F1800W | MIRI | 17.970 | 19.03 | 124.25 | 28.20 | 0.1 | — |
Provenance
- Field
- COSMOS (PRIMER); COSMOS (PRIMER COSMOS-2) (
cosmos,primercosmos2) - Programmes
01837, 02321, 07814behind every mosaic the field measured- Pipeline rows merged
- 5 largest separation 0.040″
- Detection pass
- original
- Release build
33af9933d1cc2026-10-17T14:29:44Z
Image sources
| Band | Mosaic | Native pixel | Coverage |
|---|---|---|---|
| F090W | jw01837-o004_t004_nircam_clear-f090w_i2d.fits | 0.031″ | 1.00 |
| F115W | jw01837-o004_t004_nircam_clear-f115w_i2d.fits | 0.031″ | 1.00 |
| F150W | jw01837-o004_t004_nircam_clear-f150w_i2d.fits | 0.031″ | 1.00 |
| F200W | jw02321-o002_t001_nircam_clear-f200w_i2d.fits | 0.031″ | 1.00 |
| F277W | jw01837-o004_t004_nircam_clear-f277w_i2d.fits | 0.063″ | 1.00 |
| F356W | jw01837-o004_t004_nircam_clear-f356w_i2d.fits | 0.063″ | 1.00 |
| F410M | jw01837-o004_t004_nircam_clear-f410m_i2d.fits | 0.063″ | 1.00 |
| F444W | jw01837-o004_t004_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 J100037.12+022100.8.
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.