Zobrazeno 1 - 10
of 129
pro vyhledávání: '"E. M. Burbidge"'
Publikováno v:
Publications of the Astronomical Society of the Pacific. 118:124-128
The galaxy cluster RX J0152.7−1357 at \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,x
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::898575c8f7eef19318431a195b423710
https://doi.org/10.1086/498357
https://doi.org/10.1086/498357
Publikováno v:
The Astrophysical Journal. 620:88-94
A strong X-ray source only 8" from the nucleus of the Sy2 galaxy NGC 7319 in Stephan's Quintet has been discovered by Chandra. We have identified the optical counterpart and show it is a QSO with $z_e = 2.114$. It is also a ULX with $L_x = 1.5 x 10^{
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cc40cdba4f5d91a2c7d9e55ebbbfe8d7
https://doi.org/10.1086/426886
https://doi.org/10.1086/426886
Autor:
E. M. Burbidge, R. W. Lyons, Grzegorz Madejski, E. A. Beaver, Vesa T. Junkkarinen, Ross D. Cohen
Publikováno v:
The Astrophysical Journal. 614:658-670
We present new HST STIS NUV-MAMA and STIS CCD observations of the BL Lac object AO 0235+164 and the intervening damped Ly alpha (DLA) line at z_a = 0.524. The line profile gives N(H I) = 5 +/- 1 x 10^{21} cm^{-2} and, combined with the H I 21 cm abso
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9968f09b58e7b6758ef42f5e572a7cfc
https://doi.org/10.1086/423777
https://doi.org/10.1086/423777
Publikováno v:
The Astrophysical Journal. 591:690-694
The starburst / AGN galaxy M82 was studied by Dahlem, Weaver and Heckman using X-ray data from ROSAT and ASCA, as part of their X-ray survey of edge-on starburst galaxies. They found seventeen unresolved hard-X-ray sources around M82, in addition to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c083518dc394132c71743fcb17451c3a
https://doi.org/10.1086/375411
https://doi.org/10.1086/375411
Publikováno v:
Astronomy & Astrophysics. 391:833-840
NGC3628 is a well-studied starburst/low level AGN galaxy in the Leo Triplet noted for its extensive outgassed plumes of neutral hydrogen. QSOs are shown to be concentrated around NGC3628 and aligned with the HI plumes. The closest high redshift quasa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::63e6564140c7f90359e46cdebc7c7d73
https://doi.org/10.1051/0004-6361:20020828
https://doi.org/10.1051/0004-6361:20020828
Autor:
E. M. Burbidge, Geoffrey Burbidge
Publikováno v:
Publications of the Astronomical Society of the Pacific. 114:253-256
New spectrophotometric observations are presented for three blue stellar objects pinpointed as candidate optical identifications of ROSAT X‐ray point sources in the field around the Seyfert 1 galaxy NGC 5548. They are shown to be medium‐redshift
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4b59c3b6ecb196595424d6e1372ef108
https://doi.org/10.1086/338856
https://doi.org/10.1086/338856
Autor:
E. M. Burbidge, Ross D. Cohen, D. M. Crenshaw, Vesa T. Junkkarinen, Fred Hamann, Joseph C. Shields
Publikováno v:
The Astrophysical Journal. 496:761-774
NeVIII 774 is an important tracer of the high-ionization gas in QSOs. We examine the NeVIII emission-line properties using new HST-FOS spectra of four sources, mean spectra derived from two QSO samples in the HST archives, and new photoionization cal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cfa64b3e1ba71d1943dc372429e2256c
https://doi.org/10.1086/305414
https://doi.org/10.1086/305414
Publikováno v:
The Astrophysical Journal. 478:80-86
We discuss high-resolution (~9 km s-1) Keck Observatory spectra of the associated (za ≈ ze) absorption lines in the ze = 2.15 QSO UM 675. In a previous paper we showed that the time-variable absorption lines require a minimum gas density of ~4000 c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aab2f5be2458d9b7938a9ca04645f289
https://doi.org/10.1086/303781
https://doi.org/10.1086/303781
Publikováno v:
International Astronomical Union Colloquium. 159:96-103
We describe two ongoing studies of QSO broad emissionline regions (BELRs). The first employs the N V λ1240/He II λ1640 and N V/C IV λ1549 line ratios as diagnostics of QSO metallicities. Hamann & Ferland and Ferland et al. showed that many observe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7092d5e6da0f2de7e3505a37dfd6c88e
https://doi.org/10.1017/s0252921100039725
https://doi.org/10.1017/s0252921100039725
Publikováno v:
The Astrophysical Journal. 553:L11-L13
Four compact ROSAT X-ray sources very close to the nearby ultraluminous infrared galaxy Arp 220 (IC 4553) have been identified as medium-redshift QSOs. The closest pair lying symmetrically across the galaxy have almost identical redshifts z = 1.25, 1
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6105f17524289fde735842bab31ce17b
https://doi.org/10.1086/320499
https://doi.org/10.1086/320499