Please use this identifier to cite or link to this item:
Gas and dust in a submillimeter galaxy at ⱬ = 4.24 from the herschel atlas
Itziar Aretxaga
David Hughes
Acceso Abierto
Galaxies: active
Galaxies: evolution
Galaxies: high-redshift
Galaxies: individual (ID 141)
Galaxies: starburst
Submillimeter: galaxies
We report ground-based follow-up observations of the exceptional source, ID 141, one of the brightest sources detected so far in the Herschel Astrophysical Terahertz Large Area Survey cosmological survey. ID 141 was observed using the IRAM 30 m telescope and Plateau de Bure interferometer (PdBI), the Submillimeter Array, and the Atacama Pathfinder Experiment submillimeter telescope to measure the dust continuum and emission lines of the main isotope of carbon monoxide and carbon ([C 🇮] and [C 🇮🇮]). The detection of strong CO emission lines with the PdBI confirms that ID 141 is at high redshift (ⱬ = 4.243 ± 0.001). The strength of the continuum and emission lines suggests that ID 141 is gravitationally lensed. The width (ΔV🇫🇼🇭🇲 ∼ 800 km s⁻¹) and asymmetric profiles of the CO and carbon lines indicate orbital motion in a disk or a merger. The properties derived for ID 141 are compatible with an ultraluminous (L🇫🇮🇷 ∼ (8.5 ± 0.3) × 10¹³ μ🇱⁻¹ Lꙩ, where μ🇱 is the amplification factor), dense (n ≈ 10⁴ cm⁻³), and warm (Tₖᵢₙ ≈ 40 K) starburst galaxy, with an estimated star formation rate of (0.7–1.7)×10⁴ μ🇱⁻¹Mꙩ yr⁻¹. The carbon emission lines indicate a dense (n ≈ 10⁴ cm⁻³) photon-dominated region, illuminated by a far-UV radiation field a few thousand times more intense than that in our Galaxy. In conclusion, the physical properties of the high-z galaxy ID 141 are remarkably similar to those of local ultraluminous infrared galaxies.
The Astrophysical Journal
Público en general
Cox, P., et al., (2011), Gas and dust in a submillimeter galaxy at ⱬ = 4.24 from the herschel atlas, The Astrophysical Journal, Vol. 740(63):1-10
Versión aceptada
acceptedVersion - Versión aceptada
Appears in Collections:Artículos de Astrofísica

Upload archives

File SizeFormat 
14 Cox_2011_ApJ_740_63.pdf691.23 kBAdobe PDFView/Open