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  "title": "LRDW J131124.16-012204.4 — Cerin Amroth",
  "description": "LRDW J131124.16-012204.4: a SILVER object in the LRD Watch DR1 candidate table, in Abell 1689, with images in NIRCam bands, its spectral energy distribution, vetting, redshifts and literature matches.",
  "date_modified": "2026-10-17",
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      "text": "JWST",
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      "text": "Little red dots",
      "url": "https://cerinamroth.com/jwst/lrds/"
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      "text": "LRD Watch DR1",
      "url": "https://cerinamroth.com/jwst/lrds/dr1/"
    },
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      "text": "SIMBAD within 2″",
      "url": "https://simbad.cds.unistra.fr/simbad/sim-coo?Coord=197.850693+-1.367915&Radius=2&Radius.unit=arcsec"
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      "url": "https://sky.esa.int/esasky/?target=197.850693%20-1.367915&fov=0.02&sci=true"
    },
    {
      "text": "About the release",
      "url": "https://cerinamroth.com/jwst/lrds/dr1/"
    },
    {
      "text": "← LRDW J131110.01-030813.8",
      "url": "https://cerinamroth.com/jwst/lrds/dr1/j131110.01-030813.8/"
    },
    {
      "text": "LRDW J131435.94+243318.5 →",
      "url": "https://cerinamroth.com/jwst/lrds/dr1/j131435.94+243318.5/"
    }
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  "content_markdown": "[Home](https://cerinamroth.com/) › [JWST](https://cerinamroth.com/jwst/) › [Little red dots](https://cerinamroth.com/jwst/lrds/) › [LRD Watch DR1](https://cerinamroth.com/jwst/lrds/dr1/) › LRDW J131124.16-012204.4  \n\n \n\nLRD Watch DR1 · candidate\n\n \n\n# LRDW J131124.16-012204.4\n\n \n\ncandidate tableSILVERmain classcolour laneAbell 1689\n\n \n\n \n\n \n\nRA 13:11:24.166 197.8506925°\n\n \n\nDec −01:22:04.49 -1.3679151°\n\n \n\n[SIMBAD within 2″](https://simbad.cds.unistra.fr/simbad/sim-coo?Coord=197.850693+-1.367915&Radius=2&Radius.unit=arcsec) · [ESASky](https://sky.esa.int/esasky/?target=197.850693%20-1.367915&fov=0.02&sci=true)\n\n \n\n  \n\n \n\n## Images\n\n \n\nNo image stamps: the mosaics this object was measured on are not on disk.\n\n \n\n \n\n \n\n  \n\n## Spectral energy distribution\n\n  \n- NIRCam wide\n- NIRCam medium\n- 2σ upper limit (S/N < 2)\n\n Aperture fluxes in a 0.16″-radius circle, not corrected to total; the values are in the photometry table below. The gold line marks the Balmer limit (3646 Å rest) at z = 1.200.  \n\n \n\n## At a glance\n\n \n\nTierSILVER main class\n\nFound bycolour lane\n\nRedshift1.20 colour-lane fit\n\nSpectral shapeno labelled spectrum\n\nF444W27.70 AB S/N 10, 0.16″ aperture\n\nF277W − F444W2.17 mag strict redness\n\nBH* sharenot in the BH* channel\n\nCompactnessFWHM 0.166″\n\nBalmer breaknot measured\n\nImage vettinghalf-stack pass; no flags raised\n\nLiteratureno published match within 1″\n\n \n\n \n\n \n\n \n\n \n\n## Vetting\n\n \n- Image vettingpassed\n- Half-stack testpass\n- Artifact risknone\n- Neighbournone\n- Extendedno\n\n \n- No vetting notes.\n\n \n\n \n\n \n\n## Redshifts\n\n \n\nEach 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).\n\n \n\n | Column | What it is | z | Source\n | `z_spec` | Spectroscopic, DJA grade 3 | — | —\n | `z_vet` | Adopted by vetting | 1.2000 | z_agn\n | `z_phot` | Photometric (P(z) peak) | 9.074 | 68%: 9.002–12.047\n | `z_bhs` | BH* channel fit | — | —\n | `z_agn` | Colour-lane fit | 1.20 | AGN-inclusive templates\n\n \n\n \n\n \n\n \n\n \n\n## Spectral checks\n\n \n\nV-shape (spectrum)no labelled spectrum\n\nStar (spectrum)no spectrum\n\nV-shape (photometry)not measurable βUV not measured, βopt not measured at z_agn\n\nLine in F410Mnone 0 line-free optical band(s)\n\nLine-ambiguousno\n\nSettling verdictnot evaluated\n\n \n\n \n\n \n\n## Literature\n\n \n\nPublished objects within 1″ of this position. A match is a positional recovery, not an adopted classification.\n\n \n- No published JWST little red dot or broad-line AGN within 1″.\n\n \n\n \n\n \n\n \n\n \n\n## Photometry\n\n \n\nCircular 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.\n\n \n\n | Band | Instrument | Pivot (µm) | f (nJy) | σ (nJy) | AB mag | S/N | Ap. corr.\n | F090W | NIRCam wide | 0.902 | 8.83 | 6.69 | 29.04 | 1.3 | 1.18\n | F115W | NIRCam wide | 1.154 | 9.14 | 3.67 | 29.00 | 2.5 | 1.16\n | F150W | NIRCam wide | 1.501 | 53.14 | 7.97 | 27.09 | 6.7 | 1.11–1.14\n | F182M | NIRCam medium | 1.845 | 0.47 | 3.25 | 32.22 | 0.1 | 1.17\n | F200W | NIRCam wide | 1.989 | 1.73 | 2.82 | 30.81 | 0.6 | 1.16\n | F210M | NIRCam medium | 2.095 | 65.17 | 8.64 | 26.86 | 7.5 | 1.12\n | F277W | NIRCam wide | 2.762 | 4.06 | 1.77 | 29.88 | 2.3 | 1.29\n | F300M | NIRCam medium | 2.990 | −0.72 | 2.14 | — | −0.3 | 1.28\n | F356W | NIRCam wide | 3.568 | 25.78 | 3.65 | 27.87 | 7.1 | 1.28–1.32\n | F410M | NIRCam medium | 4.082 | 19.65 | 4.54 | 28.17 | 4.3 | 1.28\n | F444W | NIRCam wide | 4.404 | 30.09 | 3.09 | 27.70 | 9.7 | 1.34\n\n \n\n \n\n \n\n## Provenance\n\n \n\n FieldAbell 1689 (`a1689`) Programmes`05782, 06882` behind every mosaic the field measured Pipeline rows merged2 all at one position Detection passoriginal Release build`33af9933d1cc` 2026-10-17T14:29:44Z \n\n \n\n \n\n \n\n## Cite\n\n \n\nAnderson, 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 J131124.16-012204.4.\n\n \n\nCC 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](https://cerinamroth.com/jwst/lrds/dr1/).\n\n \n\n [← LRDW J131110.01-030813.8](https://cerinamroth.com/jwst/lrds/dr1/j131110.01-030813.8/)[LRDW J131435.94+243318.5 →](https://cerinamroth.com/jwst/lrds/dr1/j131435.94+243318.5/)\n",
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