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7501. http://hea-www.harvard.edu/QEDT/Papers/assoc_abs.ps
THE NATURE OF ASSOCIATED ABSORPTION IN RADIOLOUD QUASARS Thomas L. Aldcroft, Martin Elvis HarvardSmithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 and Jill Bechtold Steward Observatory, University of Arizona, Tucson, AZ 85721 Submitted to Astrophysical Journal Letters, September 1994 ABSTRACT We have found eight quasars with associated Mg II absorption in a spectroscopic survey of 56 faint, steepradiospectrum quasars. ... Mg II AALQs primarily have ff r ? ...
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Ссылки http://hea-www.harvard.edu/QEDT/Papers/assoc_abs.ps -- 215.6 Кб -- 27.09.1994
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7502. http://hea-www.harvard.edu/QEDT/Papers/phl909.ps
Emission Line Diagnostics in a ``No UV Bump'' Quasar PHL909 Smita Mathur, Belinda Wilkes, Martin Elvis and Jonathan McDowell Abstract PHL909 is a quasar with unusually low ultraviolet luminosity (blue bump strength C UV=IR = \Gamma0:20 compared to an average value of 0:4 (McDowell et al. ... The intrinsic continuum of PHL909 ( i.e. as seen by the BELR ) may thus be similar to the `standard' continuum, with a big blue bump, reddened along the line of sight. ...
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Ссылки http://hea-www.harvard.edu/QEDT/Papers/phl909.ps -- 136.1 Кб -- 09.09.1994
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7503. http://hea-www.harvard.edu/QEDT/Papers/0014lett_revised.ps
AN ASCA GIS SPECTRUM OF S5 0014 + 813 AT Z=3.384 Martin Elvis 1 , M. Matsuoka 2 , A. Siemiginowska 1 , F. Fiore 1;3 , T. Mihara 2 and W. Brinkmann 4 1 HarvardSmithsonian ... Catone (RM), I00040 Italy 4 Max Planck Institut fЁur Extraterrestrische Physik D85740 Garching b. MЁunchen, Germany Ap.J. Letters ASCA Special Issue, November 1994 , in press Abstract ASCA has detected the z=3.384 quasar S5 0014 + 813 up to energies of 34 ... Accordingly we observed S5 0014+813 with ASCA. ...
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Ссылки http://hea-www.harvard.edu/QEDT/Papers/0014lett_revised.ps -- 112.3 Кб -- 26.08.1994
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7504. http://hea-www.harvard.edu/QEDT/Papers/tokyo94.ps
XRAYS AND HIGH REDSHIFT QUASARS Martin Elvis HarvardSmithsonian Center for Astrophysics, Cambridge, MA 02138, USA (internet: elvis cfa.harvard.edu) ABSTRACT Xray observations of high redshift (zё3) quasars have yielded a wealth of sur prises, both in their emission spectra, and in their absorption properties. ... Only radioloud quasars, which are relatively Xray bright, gave enough counts to allow wellconstrained spectral fits. ... Larger ff OX equals more Xray quiet. ...
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Ссылки http://hea-www.harvard.edu/QEDT/Papers/tokyo94.ps -- 227.7 Кб -- 15.07.1994
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7505. http://hea-www.harvard.edu/QEDT/Papers/3c212.ps
Absorption in 3C212 Smita Mathur HarvardSmithsonian Center for Astrophysics 60 Garden St, Cambridge MA 02138 Internet: smita@cfa.harvard.edu Accepted for publication in The Astrophysical Journal Letters 1994 Abstract 3C212 (Q0855+143) is a red quasar with ambiguous evidence for strong low energy Xray absorption in its ROSAT spectrum (Elvis et al. ... We combine Einstein and ROSAT data with ultraviolet absorption line strengths to investigate the physical state of the absorber. ...
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Ссылки http://hea-www.harvard.edu/QEDT/Papers/3c212.ps -- 149.3 Кб -- 21.06.1994
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7506. http://hea-www.harvard.edu/QEDT/Papers/3c351_new.ps
The X ray and Ultraviolet Absorbing Outflow in 3C351 Smita Mathur, Belinda Wilkes, Martin Elvis and Fabrizio Fiore HarvardSmithsonian Center for Astrophysics 60 Garden St, Cambridge MA 02138 Internet: smita@cfa.harvard.edu To Appear in The Astrophysical Journal 20 October 1994 1 Abstract 3C351 (z=0.371), an X ray `quiet' quasar, is one of the few quasars showing signs of a `warm absorber ' in its X ray spectrum; i.e. partially ionized absorbing material in the ... 10 20:5 ) column density. ...
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Ссылки http://hea-www.harvard.edu/QEDT/Papers/3c351_new.ps -- 219.2 Кб -- 21.06.1994
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7507. http://hea-www.harvard.edu/QEDT/Papers/STlines.ps
Emission Line -- Continuum Correlations in LowRedshift Quasars Belinda Wilkes , Smita Mathur, Jonathan McDowell (SAO) and Ari Laor (Caltech) We investigate the relation between the observed optical emission line strengths, widths and ratios and the observed continuum properties for two samples of quasars: 43 Einstein observed quasars for which we have obtained IR--softX 1994). ... 1) Contrary to PG sample and Shastri et al. ...
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Ссылки http://hea-www.harvard.edu/QEDT/Papers/STlines.ps -- 64.9 Кб -- 21.06.1994
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7508. http://hea-www.harvard.edu/QEDT/Papers/v5.ps
... MonteporzioCatone (Rm), I00040 Italy -- 2 -- ABSTRACT We use ROSAT PSPC spectra of z ъ 3 quasars to constrain the density and temperature of the intergalactic medium (IGM). ... However, the absence of absorption toward some highredshift quasars can be used to put limits on the possible cosmological density,\Omega G , of a hot diffuse IGM, via an Xray `GunnPeterson' test using edge and line opacity in the soft Xrays. ... 22 -- Fig. ... 7 -- Scaling of optical depth with IGM density. ... Omega 0 ...
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Ссылки http://hea-www.harvard.edu/QEDT/Papers/v5.ps -- 863.2 Кб -- 21.06.1994
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