Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Michael Eracleous"'
We introduce a Bayesian approach coupled with a Markov Chain Monte Carlo (MCMC) method and the maximum likelihood statistic for fitting the profiles of narrow absorption lines (NALs) in quasar spectra. This method also incorporates overlap between di
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1ec01101e495e0da555c66bf14425b49
Autor:
Masamune Oguri, Jane C. Charlton, Michael Eracleous, Toru Misawa, Suzuka Koyamada, Naohisa Inada, Daisuke Itoh
We performed spectroscopic observations of the small-separation lensed quasar SDSS J1001+5027, whose images have an angular separation q = 2 ''.86, and placed constraints on the physical properties of gas clouds in the vicinity of the quasar (i.e., i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7794556f3c1cad9353f502b1dbdb4e04
Publikováno v:
The Astrophysical Journal. 687:869-883
We study the 0.5-10keV emission of a sample of five of the broadest double-peaked Balmer-line emitters with Chandra. The Balmer lines of these objects originate close (within a few hundred gravitational radii) to the central black holes of the Active
Publikováno v:
The Astrophysical Journal. 660:152-166
We present six new and two previously published high-resolution spectra of the quasar HS 1603+3820 (z_em = 2.542) taken over an interval of 4.2 years (1.2 years in the quasar rest frame). The observations were made with the High-Dispersion Spectrogra
We report on the first detection of extreme-ultraviolet (EUV) absorption variability in the NeVIII 770,780 mini-broad absorption line (mini-BAL) in the spectrum of the quasar (QSO) PG 1206+459. The observed equivalent width (EW) of the NeVIII doublet
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::38b1ad3cf3fb6954a7519d2926727191
Publikováno v:
The Astrophysical Journal. 593:115-126
A handful of well-studied Weak-Line Radio Galaxies (WLRGs) have been traditionally classified as Low Ionization Nuclear Emission-line Regions (LINERs), suggesting that these two groups of AGNs might be related. In this paper, we present new optical e
Autor:
Bing Zhang, Peter Mészáros, A. Panaitescu, Robert Quimby, Peter Höflich, Frederic V. Hessman, Michael Eracleous, J. C. Wheeler, Steinn Sigurdsson, Vahé Petrosian, Pawan Kumar, Christopher L. Gerardy, Gary J. Hill, Lifan Wang, J. Mader, Bradley E. Schaefer
Publikováno v:
The Astrophysical Journal. 588:387-399
We present spectra of the optical transient of GRB021004 obtained with the Hobby-Eberly telescope starting 15.48, 20.31 hours, and 4.84 days after the burst and a spectrum obtained with the H. J. Smith 2.7 m Telescope starting 14.31 hours after the b
We employ detailed photoionization models to infer the physical conditions of intrinsic narrow absorption line systems found in high-resolution spectra of three quasars at z = 2.6-3.0. We focus on a family of intrinsic absorbers characterized by N V
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9555021d536fea65799bc8ea5fd14545
http://arxiv.org/abs/1008.2953
http://arxiv.org/abs/1008.2953
We present a compilation of spectral energy distributions of 35 weak AGNs in LINERs using recent data from the published literature. We make use of previously published compilations of data, after complementing and extending them with more recent dat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::093b61877327ff92e51830a063936c16
http://arxiv.org/abs/1001.2924
http://arxiv.org/abs/1001.2924
Autor:
Margherita Giustini, Massimo Cappi, George Chartas, Michael Eracleous, Giorgio G. C. Palumbo, Cristian Vignali, A. Comastri, L. Angelini, M. Cappi
A long XMM-Newton observation of the mini-BAL QSO PG 1126-041 allowed us to detect a highly ionized phase of X-ray absorbing gas outflowing at v~15000 km/s. Physical implications are briefly discussed.
2 pages, 2 figures. Proceedings of "X.ray A
2 pages, 2 figures. Proceedings of "X.ray A
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0de8b899dacb20d4a20ddb578c15ce6b
http://hdl.handle.net/11585/80358
http://hdl.handle.net/11585/80358