DISCOVERY OF HYDROGEN FLUORIDE IN THE CLOVERLEAF QUASAR AT z = 2.56
نویسندگان
چکیده
منابع مشابه
Detection of Emission from the Cn Radical in the Cloverleaf Quasar at Z=2.56
We report the detection of CN(N=3→2) emission towards the Cloverleaf quasar (z = 2.56) based on observations with the IRAM Plateau de Bure Interferometer. This is the first clear detection of emission from this radical at high redshift. CN emission is a tracer of dense molecular hydrogen gas (n(H2) > 10 4 cm) within star–forming molecular clouds, in particular in regions where the clouds are af...
متن کاملGas and Dust in the Cloverleaf Quasar at Redshift 2.5
We observed the upper fine structure line of neutral carbon, C I(P2 →P1) (νrest = 809 GHz), the 12CO(J=3→2) line (νrest = 345 GHz) and the 1.2 mm continuum emission from H1413+117 (Cloverleaf quasar, z = 2.5) using the IRAM interferometer. Together with the detection of the lower fine structure line (Barvainis et al. 1997), the Cloverleaf quasar is now only the second extragalactic system, besi...
متن کاملDiscovery of a Color-selected Quasar at z = 5.50.
We present observations of RD J030117+002025, a quasar at z=5.50 discovered from deep, multicolor, ground-based observations covering 74 arcmin2. This is the most distant quasar or active galaxy currently known. The object was targeted as an R-band dropout, with RAB>26.3 (3 sigma limit in a 3&arcsec; diameter region), IAB=23.8, and zAB=23.4. The Keck/Low-Resolution Imaging Spectrometer spectrum...
متن کاملThe Molecular Disk in the Cloverleaf Quasar
We propose a new interpretation for the CO emitting region of the Cloverleaf (H1413+1143), a gravitationally lensed QSO. We proceed by fitting a two-galaxy lensing model directly to the IRAM CO(7-6) data rather than to the optical HST image. From the fit we infer that the CO source might be a disk-like structure with a characteristic radius R ≥ 790 pc, a value similar to that of the CO emitting...
متن کاملDiscovery of Interstellar Hydrogen Fluoride
We report the first detection of interstellar hydrogen fluoride. Using the Long Wavelength Spectrometer (LWS) of the Infrared Space Observatory (ISO), we have detected the 121.6973 μm J = 2 − 1 line of HF in absorption toward the far-infrared continuum source Sagittarius B2. The detection is statistically significant at the 13σ level. On the basis of our model for the excitation of HF in Sgr B2...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2011
ISSN: 2041-8205,2041-8213
DOI: 10.1088/2041-8205/742/2/l21