Spatially Resolved Far-Ultraviolet Spectroscopy of the Nuclear Region of NGC 1068 (2008)
Zheng, W., Wang, J., Kriss, G. A., Sahnow, D., Allen, M., Dopita, M., ...
We carry out high-resolution FUSE spectroscopy of the nuclear region of NGC 1068. The first set of spectra was obtained with a 30" square aperture that collects all emission from the narrow-line...
G. A. Kriss, B. R. Espey, J. H. Krolik, Z. Tsvetanov, W. Zheng, A. F. Davidsen
We observed the Seyfert 1 galaxy NGC 3516 twice during the flight of Astro-2 using the Hopkins Ultraviolet Telescope aboard the space shuttle Endeavour in March 1995. Simultaneous X-ray observations...
Costantini, E., Kaastra, J. A., Arav, N., Kriss, G. A., Steenbrugge, K. C., Gabel, J. R., ...
We present a Chandra-LETGS observation of the Seyfert 1 galaxy Mrk 279. This observation was carried out simultaneously with HST-STIS and FUSE, in the context of a multi-wavelength study of this...
The mass-energy budget of the ionised outflow in NGC 7469 (2007)
Blustin, A. J., Kriss, G. A., Holczer, T., Behar, E., Kaastra, J. S., Page, M. J., ...
Although AGN feedback through ionised winds is of great importance in models of AGN/galaxy coevolution, the mass and energy output via these winds, even in the nearby universe, is poorly understood....
Constantini, E., Kaastra, J.S., Arav, N., Kriss, G.A., Steenbrugge, K.C., Gabel, J.R., ...
We present a Chandra-LETGS observation of the Seyfert 1 galaxy Mrk 279. This observation was carried out simultaneously with HST-STIS and FUSE, in the context of a multiwavelength study of this...
Costantini, E., Kaastra, J. S., Arav, N., Kriss, G. A., Steenbrugge, K. C., Gabel, J. R., ...
We present a Chandra-LETGS observation of the Seyfert 1 galaxy Mrk 279. This observation was carried out simultaneously with HST-STIS and FUSE, in the context of a multiwavelength study of this...
Kraemer, S. B., Crenshaw, D. M., Gabel, J. R., Kriss, G. A., Netzer, H., Peterson, B. M., ...
We present a detailed analysis of the intrinsic absorption in the Seyfert 1 galaxy NGC 4151 using UV spectra from the HST/STIS and FUSE, obtained 2002 May as part of a set of contemporaneous...
A Study of the Reionization History of Intergalactic Helium with FUSE and VLT (2006)
Zheng, W., Kriss, G. A., Dixon, W. V., Kruk, J. W., Shull, J. M., ...
We obtained high-resolution VLT and FUSE spectra of the quasar HE2347-4342 to study the properties of the intergalactic medium between redshifts z=2.0-2.9. The high-quality optical spectrum allows us...
The UV spectrum of HS1700+6416 II. FUSE observations of the HeII Lyman alpha forest (2006)
Fechner, C., Reimers, D., Kriss, G. A., Baade, R., Blair, W. P., Giroux, M. L., ...
We present the far-UV spectrum of the quasar HS1700+6416 taken with FUSE. This QSO provides the second line of sight with the HeII absorption resolved into a Ly alpha forest structure. Since...
Clavel, J., Schulz, B., Altieri, B., Barr, P., Alloin, D., ...
Mid-infrared images of the Seyfert 1 galaxy Mrk 279 obtained with the ISO satellite are presented together with the results of a one-year monitoring campaign of the 2.5-11.7 micron spectrum....
Kraemer, S. B., George, I. M., Crenshaw, D. M., Gabel, J. R., Turner, T. J., Gull, T. R., ...
We present a detailed analysis of the intrinsic X-ray absorption in the Seyfert 1 galaxy NGC 4151 using Chandra/HETGS data obtained 2002 May, as part of a program which included simultaneous UV...
Gabel, J. R., Kraemer, S. B., Crenshaw, D. M., George, I. M., Brandt, W. N., Hamann, F. W., ...
We present results on the location, physical conditions, and geometry of the outflow in the Seyfert 1 galaxy NGC 3783 from a study of the variable intrinsic UV absorption. Based on 18 observations...
The EUV variability of the luminous QSO HS 1700+6416 (2005)
Reimers, D., Schramm, J., Kriss, G. A., Shull, J. M.
We report on the first observations of variations in UV (intrinsic EUV 330 A) flux of the luminous QSO HS 1700+6416 (z=2.72) over a decade. The amplitude of variations increases from +/-0.1 mag in...
Kaastra, J. S., Raassen, A. J. J., Mewe, R., Arav, N., Behar, E., Gabell, J. R., ...
One of the main problems in modeling the ionised outflows in Active Galactic Nuclei is the unknown distance of the outflowing wind to the central source. Only if the density is known this distance...
Kaastra, J.S., Raassen, A.J.J., Mewe, R., Arav, N., Behar, E., Costantini, E., ...
One of the main problems in modeling the ionised outflows in Active Galactic Nuclei is the unknown distance of the outflowing wind to the central source. Only if the density is known this distance...
A Study of the Reionization History of Intergalactic Helium with FUSE and VLT (2003)
Zheng, W., Kriss, G. A., Dixon, W. V., Kruk, J. W., Shull, J. M., ...
We obtained high-resolution VLT and FUSE spectra of the quasar HE2347-4342 to study the properties of the intergalactic medium between redshifts z=2.0-2.9. The high-quality optical spectrum allows us...
Netzer, H., Kaspi, S., Behar, E., Brandt, W. N., Chelouche, D., George, I. M., ...
We present a detailed spectral analysis of the data obtained from NGC 3783 during the period 2000-2001 using Chandra. This analysis leads us to the following results. 1) NGC 3783 fluctuated in...
Gabel, J. R., Crenshaw, D. M., Kraemer, S. B., Brandt, W. N., George, I. M., Hamann, F. W., ...
We report an intrinsic absorber with decreasing outflow velocity in the Seyfert 1 galaxy NGC 3783. This is the first detection of a change in radial velocity in an outflow associated with a Seyfert...
Blustin, A. J., Branduardi-Raymont, G., Behar, E., Kaastra, J. S., Kriss, G. A., Page, M. J., ...
We present an XMM-Newton observation of NGC 7469, including studies of the X-ray and UV variability, 0.2-10 keV spectral continuum, Fe K-alpha emission line and the first-ever high-resolution X-ray...
Multiwavelength studies of the Seyfert 1 galaxy NGC7469. I - Far UV observations with FUSE (2003)
Kriss, G. A., Blustin, A., Branduardi-Raymont, G., Green, R. F., Hutchings, J., Kaiser, M. E.
We obtained far-ultraviolet spectra of the Seyfert 1 galaxy NGC 7469 using the FUSE on 1999 December 6. Our spectra cover the wavelength range 990-1187 A with a resolution of 0.05 A. We see broad...
A Study of the Reionization History of Intergalactic Helium with FUSE and VLT (2003)
Zheng, W., Kriss, G. A., Dixon, W. V., Kruk, J. W., Shull, J. M., ...
We obtained high-resolution VLT and FUSE spectra of the quasar HE2347-4342 to study the properties of the intergalactic medium between redshifts z=2.0-2.9. The high-quality optical spectrum allows us...
A Study of the Reionization History of Intergalactic Helium with FUSE and VLT (2003)
Zheng, W., Kriss, G. A., Dixon, W. V., Kruk, J. W., Shull, J. M., ...
We obtained high-resolution VLT and FUSE spectra of the quasar HE2347-4342 to study the properties of the intergalactic medium between redshifts z=2.0-2.9. The high-quality optical spectrum allows us...
Telfer, R. C., Kriss, G. A., Zheng, W., Davidsen, A. F., Tytler, D.
We create stacked composite absorption spectra from Hubble Space Telescope Faint Object Spectrograph data from four quasi-stellar objects to search for absorption lines in the extreme ultraviolet...
Yuan, Q., Green, R. F., Brotherton, M., Tripp, T. M., Kaiser, M. E., Kriss, G. A.
As one of the most luminous radio-loud quasars showing intrinsic ultraviolet (UV) and X-ray absorption, 3C 351 provides a laboratory for studying the kinematics and physical conditions of such...
Kaspi, S., Brandt, W. N., George, I. M., Netzer, H., Crenshaw, D. M., Gabel, J. R., ...
We present results from a 900 ks exposure of NGC 3783 with the High-Energy Transmission Grating Spectrometer on board the Chandra X-ray Observatory. The resulting X-ray spectrum has the best...
Crenshaw, D. M., Kraemer, S. B., Turner, T. J., Collier, S., Peterson, B. M., Brandt, W. N., ...
We use Hubble Space Telescope UV and optical spectra of the narrow-line Seyfert 1 (NLS1) galaxy Akn 564 to investigate its internal reddening and properties of its emission-line and intrinsic UV...
The Rest-Frame Extreme Ultraviolet Spectral Properties of QSOs (2001)
Telfer, R. C., Zheng, W., Kriss, G. A., Davidsen, A. F.
We use a sample of 332 Hubble Space Telescope spectra of 184 QSOs with z > 0.33 to study the typical ultraviolet spectral properties of QSOs, with emphasis on the ionizing continuum. Our sample is...
Brotherton, M. S., Green, R. F., Kriss, G. A., Oegerle, W., Kaiser, M. E., Zheng, W., ...
We present far-ultraviolet spectra of the Seyfert 1.5 galaxy NGC 5548 obtained in 2000 June with the Far Ultraviolet Spectroscopic Explorer (FUSE). Our data span the observed wavelength range...
Kriss, G. A., Shull, J. M., Oegerle, W., Zheng, W., Davidsen, A. F., Songaila, A., ...
The neutral hydrogen and the ionized helium absorption in the spectra of quasars are unique probes of structure in the early universe. We present Far-Ultraviolet Spectroscopic Explorer observations...
Zheng, W., Kriss, G. A., Wang, J. X., Brotherton, M., Oegerle, W. R., Blair, W. P., ...
We present a moderate-resolution (~20 km/s) spectrum of the mini broad-absorption-line QSO PG1351+64 between 915-1180 A, obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE). Additional...
Collier, S., Crenshaw, D. M., Peterson, B. M., Brandt, W. N., Clavel, J., Edelson, R., ...
We present results of an intensive two-month campaign of approximately daily spectrophotometric monitoring of the narrow-line Seyfert 1 galaxy Akn 564 with HST. The fractional variability amplitude...
Evidence for an accelerating wind as the broad-line region in NGC 3516 (2001)
Hutchings, J. B., Kriss, G. A., Green, R. F., Brotherton, M., Kaiser, M. E., Koratkar, A. P., ...
Spectroscopic data in wavelengths 900--3000A have been obtained in a low flux state of the nucleus of the Seyfert 1 galaxy NGC 3516. The line profiles show P Cygni characteristics, particularly in O...
Clavel, J., Schulz, B., Altieri, B., Barr, P., Alloin, D., ...
Mid-infrared images of the Seyfert 1 galaxy Mrk 279 obtained with the ISO satellite are presented together with the results of a one-year monitoring campaign of the 2.5-11.7 micron spectrum....
Clavel, J., Schulz, B., Altieri, B., Barr, P., Alloin, D., ...
Mid-infrared images of the Seyfert 1 galaxy Mrk 279 obtained with the ISO satellite are presented together with the results of a one-year monitoring campaign of the 2.5-11.7 micron spectrum....
Clavel, J., Schulz, B., Altieri, B., Barr, P., Alloin, D., ...
Mid-infrared images of the Seyfert 1 galaxy Mrk 279 obtained with the ISO satellite are presented together with the results of a one-year monitoring campaign of the 2.5-11.7 micron spectrum....
A Search for Extended Line Emission from BALQSOs (2000)
Telfer, R. C., Kriss, G. A., Tsvetanov, Z.
We have obtained HST NICMOS snapshot images of ten BALQSOs and four radio-quiet non-BALQSOs to search for extended narrow-line regions. For each object we obtained an image in the F160W filter and a...
FUSE Observations of Intrinsic Absorption in the Seyfert 1 Galaxy Mrk 509 (2000)
Kriss, G. A., Green, R. F., Brotherton, M., Oegerle, W., Sembach, K. R., Davidsen, A. F., ...
We present far-ultraviolet spectra of the Seyfert 1 galaxy Mrk 509 obtained in 1999 November with the Far Ultraviolet Spectroscopic Explorer (FUSE). Our data span the observed wavelength range...
Kriss, G. A., Davidsen, A. F., Zheng, W., Lee, G.
We present absolutely calibrated FUV spectra of the quasar 3C~273 covering 900- 1800 A. Our ~3 A resolution spectra were obtained with the Hopkins Ultraviolet Telescope during the Astro-1 mission in...
Dietrich, M., Leighly, K., Alloin, D., Clavel, J., Crenshaw, D. M., ...
As part of an extensive multi-wavelength monitoring campaign, the International Ultraviolet Explorer satellite was used to observe the broad-line radio galaxy 3C 390.3 during the period 1994 December...
The Nuclear Spectrum of M87 (1998)
Tsvetanov, Z. I., Hartig, G. F., Ford, H. C., Kriss, G. A., Dopita, M. A., Dressel, L. L., ...
The nuclear spectrum of M87 covering the Ly_a-H_a wavelength range was obtained with the HST Faint Object Spectrograph (FOS) trough a 0.21 arcsec aperture. Contrary to some previous claims, a single...
Far-UV Observations of NGC 4151 during the ORFEUS-SPAS II Mission (1997)
Espey, B. R., Kriss, G. A., Krolik, J. H., Zheng, W., Tsvetanov, Z., Davidsen, A. F.
We observed the Seyfert 1 galaxy NGC 4151 on eleven occasions at 1-2 day intervals using the Berkeley spectrometer during the ORFEUS-SPAS II mission in 1996 November. The mean spectrum covers...
Wanders, I., Peterson, B.M., Alloin, D., Ayres, T.R., Clavel, J., Crenshaw, D.M., ...
From 1996 June 10 to July 29, the International Ultraviolet Explorer monitored the Seyfert 1 galaxy NGC 7469 continuously in an attempt to measure time delays between the continuum and emission-line...
HUT Observations of Time-Variable Absorption in NGC 4151 (1997)
We present the results of ultraviolet spectral monitoring of the Seyfert galaxy NGC 4151 performed by the Hopkins Ultraviolet Telescope during the Astro-2 mission. We show how the response of the...
A Composite HST Spectrum of Quasars (1996)
Zheng, W., Kriss, G. A., Telfer, R. C., Grimes, J. P., Davidsen, A. F.
We construct a composite quasar spectrum from 284 HST FOS spectra of 101 quasars with redshifts z > 0.33. The spectrum covers the wavelengths between 350 and 3000 A in the rest frame. There is a...
Far-Ultraviolet Observations of NGC 3516 using the Hopkins Ultraviolet Telescope (1996)
Kriss, G. A., Espey, B. R., Krolik, J. H., Tsvetanov, Z., Zheng, W., Davidsen, A. F.
We observed the Seyfert 1 galaxy NGC 3516 twice during the flight of Astro-2 using the Hopkins Ultraviolet Telescope in March 1995. Simultaneous X-ray observations were performed with ASCA. Our...
ASCA Observations of the Composite Warm Absorber in NGC 3516 (1996)
Kriss, G. A., Krolik, J. H., Otani, C., Espey, B. R., Turner, T. J., Kii, T., ...
We obtained X-ray spectra of the Seyfert 1 galaxy NGC~3516 in March 1995 using ASCA. Simultaneous far-UV observations were obtained with HUT on the Astro-2 shuttle mission. The ASCA spectrum shows a...