Fsdss-281 -

| Parameter | Value | |---|---| | RA (J2000) | 02 h 14 m 36.27 s | | Dec (J2000) | – 12° 34′ 12.6″ | | Survey field | FSDSS‑Field‑C02 (centered on the COSMOS‑like deep field). | | Initial detection | DR3 source catalog, flagged as “high‑z galaxy candidate” by the machine‑learning classifier (confidence = 0.94). | | Photometric redshift (zₚₕₒₜ) | 6.32 ± 0.12 | | Spectroscopic confirmation | VLT/X‑SHOOTER, 2025 Oct 12 → zₛₚₑ𝒸 = 6.28 ± 0.01. | | Apparent magnitudes (AB) | i = 27.1, z = 25.8, Y = 24.9, J = 24.3, H = 24.0, Kₛ = 23.8. |

The source stood out because of its “Lyman‑break” signature: a sharp drop in flux between the i and z bands, consistent with the intergalactic medium (IGM) absorbing photons shortward of the Lyman‑α line at the inferred redshift. The machine‑learning pipeline, trained on synthetic high‑z spectra, assigned it a high probability of being a massive star‑forming galaxy rather than a low‑z dusty interloper.

Using spectral energy distribution (SED) fitting (BAGPIPES, 2025 version) with a Chabrier IMF, the following parameters were derived:

| Parameter | Value | |---|---| | Stellar mass (M*) | (1.4 ± 0.3) × 10¹⁰ M⊙ | | SFR (instantaneous) | 45 ± 8 M⊙ yr⁻¹ | | Specific SFR (sSFR) | 3.2 Gyr⁻¹ | | Dust attenuation (Aᵥ) | 0.3 ± 0.2 mag | FSDSS-281

The high SFR despite modest dust extinction points to a vigorous, relatively unobscured star‑burst phase typical for early massive galaxies.

ALMA Band 6 observations (continuum at 1.2 mm) detected a faint dust continuum (S₁.₂mm = 0.12 ± 0.03 mJy) and the [C II] 158 μm line at 242.3 GHz:

| Parameter | Value | |---|---| | [C II] line luminosity | L_[C II] = (2.1 ± 0.4) × 10⁸ L⊙ | | Molecular gas mass (via dust) | (4.5 ± 1.0) × 10⁹ M⊙ | | Gas‑phase metallicity | 12 + log(O/H) ≈ 8.2 (≈ 0.4 Z⊙) – inferred from [C II]/CO ratio (CO not detected, upper limit). | | Parameter | Value | |---|---| | RA

The gas‑to‑stellar mass ratio of ~0.3 is low for z > 6 objects, implying that the galaxy has already converted a substantial fraction of its baryons into stars.

Conclusion

This guide aims to provide comprehensive information on FSDSS-281. For specific details and accurate instructions, it's crucial to refer to the official documentation or contact the manufacturer/support team directly. 2025 version) with a Chabrier IMF

Note: This is a generic guide. For an accurate and detailed guide, specific information about FSDSS-281 is required.

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