Optical and Infrared Investigation toward the [CLC][ITAL]z[/ITAL][/CLC] = 3.8 Quasar Pair PC 1643+4631A, B
نویسندگان
چکیده
منابع مشابه
the investigation of the relationship between type a and type b personalities and quality of translation
چکیده ندارد.
A new apparent quasar pair: Q2225-403A,B
We report the serendipitous discovery of a previously unknown quasar at 10.5 from Q2225-403 (z = 2.410). The observation of the broad emission line of Mg iiλ2798 and of the surrounding Fe ii multiplets indicates that the companion quasar is at z = 0.932. The spectrum of Q2225-403 shows a number of absorption lines, the most noteworthy is the Mg ii line at the same redshift of the companion, sug...
متن کاملThe Quasar Pair Q 1634 + 267 A , B and the Binary QSO vs . Dark Lens Hypotheses
Deep HST/NICMOS H (F160W) band observations of the z = 1.96 quasar pair Q 1634+267A,B reveal no signs of a lens galaxy to a 1σ threshold of ≃ 22.5 mag. The minimum luminosity for a normal lens galaxy would be a 6L * galaxy at z ≃ 0.5, which is 1000 times greater than our detection threshold. Our observation constrains the infrared mass-to-light ratio of any putative, early-type, lens galaxy to ...
متن کاملOptical and Infrared Photometry of the Micro-quasar GRO J1655-40 in Quiescence
We present BV IJK photometry of the black–hole candidate GRO J1655–40 in full quiescence. We report a refined orbital period of 2.62191 ± 0.00020 days. The light curves are dominated by ellipsoidal variations from the secondary star. We model the light curves with an upgraded code which includes a more accurate treatment of limb darkening. Previous models containing a large cool disk are ruled ...
متن کاملThe obscured quasar population from optical, mid-infrared, and X-ray surveys
Over the last few years, optical, mid-infrared and X-ray surveys have brought to light a significant number of candidate obscured AGN and, among them, many Type 2 quasars, the long-sought after “big cousins” of local Seyfert 2 galaxies. However, despite the large amount of multi-wavelength data currently available, a proper census and a panchromatic view of the obscured AGN/quasar population ar...
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: 1997
ISSN: 0004-637X
DOI: 10.1086/310565