ISO Observations of Quasars and Quasar Hosts Belinda J. Wilkes Smithsonian Astrophysical Observatory, 60 Garden St., Cambridge, MA 02138, USA Abstract. The Infrared Space Observatory (ISO), launched in November 1995, allows us to measure the farinfrared (farIR) emission of quasars in greater detail and over a wider energy range than previously possible. ... ISO Observations of Quasars and Quasar Hosts 3 3 Analysis of ISOPHOT data. ...
UNDERSTANDING THE ELUSIVE DWARF CARBON STAR Invited Review Talk, 1996, IAU Symp. 177: The Carbon Star Phenomenon PAUL J. GREEN Smithsonian Astrophysical Observatory HarvardSmithsonian Center for Astrophysics 60 Garden St., Cambridge, MA 02140, USA Abstract. ... 1 (carbon stars) are not giants but dwarfs. The newlyrecognized class of dwarf carbon stars joins the growing family of stars with peculiar abundances that are now recognized as products of masstransfer binary (MTB) evolution. ...
Xray Spectroscopy of QSO Absorbers Paul J. Green & Smita Mathur HarvardSmithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138 Received ; accepted 2 pgreen@cfa.harvard.edu -- 2 -- ABSTRACT The optical/ultraviolet (OUV) emission of QSOs has not proved a ready key to unlock the physics of the broad line region immediately surrounding the central engine of QSOs. ... UV Spectra of BALQSOs From 10 to 15% of opticallyselected QSO spectra show broad absorption line (BAL) troughs. ...
... For NGC3516 we find that the Xray warm absorption and the broad UV associated absorption features can be produced by the same absorbing material. ... Is it also true for NGC3516? ... 1996). ... Here we argue that the XUV absorption picture is consis tent with the presence of a highly ionized Xray absorber and the current non detection of CIV and NV broad absorption lines (see Fig. ... Pre1992: It showed broad, high ionization CIV and NV absorption lines and an Xray ionized absorber (U ! ...
The Einstein Database of IPC Xray Observations of Optically and Radio Selected Quasars. ... The data are presented in a series of tables as follows: Table 1 gives the basic information on each quasar; Table 2 gives details of the Einstein observations; Table 3 gives the Xray fluxes and luminosities for five different assumed energy indices: a) 0.0; b) 0.5; c) 1.0; d) 1.5; e) 2.0; Tables 5a,b list objects and observations missing from our database; Table 6 gives optical magnitudes and luminosities. ...
Emission Lines and the Spectral Energy Distributions of Quasars B. J. Wilkes, P. J. Green, S. Mathur & J. C. McDowell HarvardSmithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA Abstract. ... Continuum luminosities L opt , L x and ff ox are taken from Wilkes et al. (1994), opticalUV slopes (ff ouv ) from Kuhn (1996) and Xray slopes (ff x ) from Elvis et al. (1994) and Wilkes & Elvis (1987). ... Correlations with the continuum luminosities are seen for all lines except CIV. ...
... Optical Identifications X ray Optical Survey Name S 0:5\Gamma2 keV RA (J2000) Dec ` RA (J2000) Dec O\GammaX E O O\GammaE ID z Notes erg s \Gamma1 cm \Gamma2 h m s ffi 0 00 0 h m s ffi 0 00 00 CRSS0007.3+2042 0.48\ Theta10 \ Gamma13 00 07 21.9 +20 42 04 13.6 00 07 21.7 +20 42 02 2.6 18.53 18.78 0.24 QSO 0.7686 CRSS0007.5+2034 0.34\ Theta10 \ ... The closest optical counterpart is a faint source with an ambiguous optical spectrum. ...
... ABSTRACT We develop and apply a novel method of analysis to study the Xray spectral properties of 908 QSOs in the Large Bright Quasar Survey (LBQS) that were observed during the soft Xray ROSAT AllSky Survey (RASS). ... In application to the LBQS/RASS sample, we marginally confirm a flattening of the Xray spectral index of QSOs toward higher redshifts. ... The Xray and optical properties of an LBQS/RASS overlap sample of 908 QSOs have been described and analysed by Green et al. ... Redshift. ...
DARK MATTER IN THE UNIVERSE Paul J. Green UNSEEN MASS: Astronomers studying the motions of stars and galaxies throughout the universe have long noticed a strange discrepancy. Stars move around galaxies as if pulled by ten times the matter that we can see. ... GRAVITATIONAL LENSING: Since dark matter by definition cannot be directly observed, several recent searches have instead exploited the predicted gravitational effects of its mass on the observed light from nearby stars. ...
... We present results of the modeling of the spectrum of the high redshift (z=2.72), high luminosity (L ё 5\Theta10 48 ergs s \Gamma1 ) quasar, HS1700+6416 (Reimers et al. 1989), observed with HST FOS (Reimers at al 1992) and GHRS (Reimers 1995). ... We fit the HS1700+6416 spectral energy distribution with several theoretical models including accretion disk models and freefree optically thin emission. ... 1995). ... Modelling the Spectral Energy Distribution of HS1700+6416 ffl Accretion disks. ...
BROAD ABSORPTION LINE QSOS OBSERVED BY THE ROSAT PSPC Paul J. Green 1;2 and Smita Mathur HarvardSmithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138 ABSTRACT Recent results from the ROSAT AllSky Survey (RASS) have shown that broad absorption line (BAL) QSOs are either highly absorbed or underluminous in the soft Xray bandpass. ... We predict that samples of QSO candidates with large ff ox will yield a higher percentage of BALQSOs, particularly at low redshift. ... 1995). ...
... Data at 1.464 GHz from the VLA Archive (code : AM330 , see x2 for more details) \Pi Radio flux at 5 GHz from Kellermann et al. (1989) ffl Data at 1.477 GHz from the VLA Archive (code : AL146 , see x2 for more details) ... ray Luminosity Function Models Model q 0 fl 1 fl 2 logL \Lambda X (0) y k \Phi \Lambda X z PKS V e =V a N obj Surveys Used A RL 0.0 0.48\Sigma0.25 3.17\ Sigma0.20 44.14\ Sigma0.18 2.79\Sigma0.26 0.02 0.24 0.77\Sigma0.04 43 EMSS A RQ 0.0 1.76\ ...
... Received 1995 July 26; in original form 1995 April 28 ABSTRACT We present the results of the VLA Radio observations at 1.475 GHz (20 cm) of the Active Galactic Nuclei (AGN) in the CambridgeCambridge ROSAT Serendipity Survey (CRSS), a sample of 123 faint Xray sources with f x (0.52.0 keV)– 2 \Theta 10 \Gamma14 erg s \Gamma1 cm \Gamma2 . ... Until recently the EMSS AGN sample was the only sample of Xray selected AGN for which complete radio in formation exists. ... 0:35) objects. ...