Keck Spectroscopy of 4 Qso Host Galaxies

نویسنده

  • J. S. MILLER
چکیده

We present optical spectroscopy of the host galaxies of 4 QSO’s: PG 1444+407, PKS 2349-147, 3C 323.1, and 4C 31.63 having a redshift range 0.1 ≤ z ≤ 0.3. The spectra were obtained at the Keck Observatory with the LRIS instrument offset 2-4 arcseconds from the nucleus at several position angles in each galaxy. The objects close to 3C 323.1 and PKS 2349-147 have the same redshifts of their nearby QSOs and appear to be the nuclei of galaxies in the final states of merging with the host galaxies. The spectra of the hosts show some variety: PKS 2349-147 and 3C 323.1 show strong off-nuclear emission lines plus stellar absorption features, while the other two show only stellar absorption. PKS 2349-147 and PG 1444+407 have a mixture of old and moderately young stars, while 4C 31.63 has the spectrum of a normal giant elliptical, which is very rare in our larger sample. The spectrum of the host of 3C 323.1 appears to dominated by older stars, though our data for it are of lower quality. The redshifts of the off-nucleus emission lines and stellar components are very close to those of the associated QSOs. Subject headings: galaxies: active—(galaxies:) quasars: general—techniques: spectroscopic—(galaxies:) quasars: individual (PG 1444+407, PKS 2349-147, 3C 323.1,and 4C 31.63)

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

First case of strong gravitational lensing by a QSO: SDSS J0013+1523 at z = 0.120*

We present the first case of strong gravitational lensing by a QSO: SDSS J0013+1523 at z = 0.120. The discovery is the result of a systematic search for emission lines redshifted behind QSOs, among 22 298 spectra of the SDSS data release 7. Apart from the z = 0.120 spectral features of the foreground QSO, the spectrum of SDSS J0013+1523 also displays the [O ii] and Hβ emission lines and the [O ...

متن کامل

Three quasi-stellar objects acting as strong gravitational lenses⋆

We report the discovery of three new cases of quasi-stellar objects (QSOs) acting as strong gravitational lenses on background emission line galaxies: SDSS J0827+5224 (zQSO = 0.293, zs = 0.412), SDSS J0919+2720 (zQSO = 0.209, zs = 0.558), SDSS J1005+4016 (zQSO = 0.230, zs = 0.441). The selection was carried out using a sample of 22,298 SDSS spectra displaying at least four emission lines at a r...

متن کامل

Keck Spectroscopy of Four Quasi-stellar Object Host Galaxies

We present optical spectroscopy of the host galaxies of four quasi-stellar objects (QSOs)—PG 1444 407, PKS 2349 147, 3C 323.1, and 4C 31.63—having a redshift range . The spectra were obtained at 0.1 ≤ z ≤ 0.3 the Keck Observatory with the Low Resolution Imaging Spectrograph instrument offset 2 –4 from the nucleus at several position angles in each galaxy. The objects close to 3C 323.1 and PKS 2...

متن کامل

Serendipitous Discovery of a Bal Qso at Z = 2.169

We report the serendipitous discovery of a BAL QSO at z = 2.169, located 41 southwest of 3C 48. We present Keck LRIS spectroscopy covering rest frame 1500 Å to 2300 Å. The C IV BAL has three components and it extends to outflow velocities of at least 12,000 km s. The BAL QSO has an intervening low-ionization metal-line absorption system at z = 1.667 which is likely to be a damped Lyα absorber. ...

متن کامل

Origin of companion galaxies in QSO hosts

Recent morphological studies of QSO host galaxies by the Hubble Space Telescope (HST) have revealed that a sizable fraction of QSO host galaxies possess close small companion galaxies. It is however not clear why and how these companion galaxies are physically associated with the activation of QSO nucleus and the formation of QSO hosts. We here demonstrate that QSO companion galaxies are tidall...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2008