OQ 172 (OHIO Q 172) is a quasar [1] located in the constellation of Boötes. It has a redshift of (z) 3.544, [2] making it one of the most distant quasars at the time of its discovery by astronomers in 1973. [3] This object was the record holder for almost a decade, before being surpassed by PKS 2000-330 in 1982 located at the redshift of (z) 3 ...

Photoelectric spectrophotometry of OQ 172 and OH 471 Absolute spectral energy distributions for the large-redshift quasars OQ 172 and OH 471 are discussed along with similar data for two other quasars: 4C 05.34 and PHL 957. If the redshift are assumed to be cosmological, OQ 172 and OH 471 are not as luminous as PHL 957.

1984年1月1日 · Absorption spectra of the quasar OH 471 (z e =3.40) and OQ 172 (z e =3.53) were observed with 2-Å resolution using the Image-Photon Counting System on the 6-m telescope of the USSR Academy of Sciences. An analysis of these spectra provides an information about the absorbing material existed at earlier cosmological epochs.

The observations of OQ 172 present an interesting and important difference from those of OH 471 and 4C05.34. Here La is observed with the usual equivalent width, but there is no discontinuity at the' Lyman limit. In terms of the spherically symmetrical model, the strength of La requires a drop in intensity at the Lyman limit by 30 percent, which

1984年1月31日 · Detailed observations of the spectra of the radio QSO PKS 0805 + 046 (emission-line redshift = 2.8772), obtained with the image photon counting system on the RGO spectrograph at the f/8 Cassegrain ...

The 385-420-nm absorption features toward OQ 172 are characterized on the basis of spectra obtained at 2.2-A resolution using a 1000-channel video photon counter and a fast spectrograph with a 1302-line/mm grating and first-order dispersion 50 A/mm at the f/4 prime focus of the 6-m telescope of the USSR Special Astrophysical Observatory at ...

The optical spectra of distant quasars (OQ 172, PHL 957, PKS 0237-233 and 11 others) were reanalysed with the purpose of searching molecular lines /2, 4/.

Absolute spectral energy distributions for the large-redshift quasars OQ 172 and OH 471 are discussed along with similar data for two other quasars: 4C 05.34 and PHL 957. If the redshift are assumed to be cosmological, OQ 172 and OH 471 are not as luminous as PHL 957.

OQ 172 is highly elongated, suggestive of either a jet or an unresolved double, while NRAO 667 is found to contain at least two components plus a more diffuse "halo." The sizes of OH 471 and OQ 172 are consistent with their lack of detection at x-ray energies by HEAO-1.

RADIO spectra for the highly redshifted z~ 3.40 quasars OH471 (ref. I) and OQ 172 (ref. 2) are presented here for frequencies between 16.7 M Hz and 85.3 G Hz. The spectra are complex. Both have a...