Radial Velocity Offsets Due to Mass Outflows and Extinction in Active Galactic Nuclei (2009)
Crenshaw, D. M., Schmitt, H. R., Kraemer, S. B., Mushotzky, R. F., Dunn, J. P.
We present a study of the radial velocity offsets between narrow emission lines and host galaxy lines (stellar absorption and H I 21-cm emission) in Seyfert galaxies with observed redshifts less than...
The Mid-Infrared Continua of Seyfert Galaxies (2009)
Deo, Rajesh. P., Richards, Gordon. T., Crenshaw, D. M., Kraemer, S. B.
An analysis of archival mid-infrared (mid-IR) spectra of Seyfert galaxies from the Spitzer Space Telescope observations is presented. We characterize the nature of the mid-IR active nuclear continuum...
Turner, T. J., Miller, L., Kraemer, S. B., Reeves, J. N., Pounds, K. A.
We present results from a 200 ks Suzaku observation of 1H 0419-577 taken during 2007 July. The source shows a strong excess of counts above 10 keV compared to the extrapolation of models based on...
Physical Conditions in the Inner Narrow Line Region of the Seyfert 2 Galaxy Markarian 573 (2009)
Kraemer, S. B., Trippe, M. L., Crenshaw, D. M., Melendez, M., Schmitt, H. R., Fischer, T. C.
We have examined the physical conditions within a bright emission-line knot in the inner narrow-line region (NLR) of the Seyfert 2 galaxy Mrk 573 using optical spectra and photoionization models. The...
Mass Outflow in the Seyfert 1 Galaxy NGC 5548 (2009)
Crenshaw, D. M., Kraemer, S. B., Schmitt, H. R., Kaastra, J. S., Arav, N., Gabel, J. R., ...
We present a study of the intrinsic UV absorption and emission lines in an historically low-state spectrum of the Seyfert 1 galaxy NGC 5548, which we obtained in 2004 February at high spatial and...
Constraining the AGN Contribution in a Multiwavelength Study of Seyfert Galaxies (2008)
Meléndez, M., Kraemer, S. B., Schmitt, H. R., Crenshaw, D. M., Deo, R. P., Mushotzky, R. F., ...
We have studied the relationship between the high- and low-ionization [O IV] lambda 25.89 micron, [Ne III] lambda 15.56 micron and [Ne II] lambda 12.81 micron emission lines with the aim of...
Dunn, Jay P., Crenshaw, D. Michael, Kraemer, S. B., Trippe, M. L.
In a continuing survey of active galactic nuclei observed by the Far Ultraviolet Spectroscopic Explorer, we provide a deeper analysis of intrinsic absorption features found in 35 objects. Our survey...
Meléndez, M., Kraemer, S. B., Armentrout, B. K, Deo, R. P., Crenshaw, D. M., Schmitt, H. R., ...
We have studied the relationship between the [O IV] lambda 25.89 micron emission line luminosities, obtained from Spitzer spectra, the X-ray continua in the 2-10 keV band, primarily from ASCA, and...
Tracing a Disk Wind in NGC 3516 (2008)
Turner, T. J., Reeves, J. N., Kraemer, S. B., Miller, L.
X-ray spectra of AGN often contain signatures indicative of absorption in multiple layers of gas whose ionization-state and covering fraction may vary with time. It has been unclear to date how much...
Probing the Ionization Structure of the Narrow Line Region in the Seyfert 1 Galaxy NGC 4151 (2008)
Kraemer, S. B., Schmitt, H. R., Crenshaw, D. M.
We present a study of the distribution of [O III] $\lambda$5007 and [O II] $\lambda$3727 emission in the Narrow Line Region (NLR) of the Seyfert 1 galaxy NGC 4151. While the NLR of NGC 4151 exhibits...
Deo, R. P., Crenshaw, D. M., Kraemer, S. B., Dietrich, M., Elitzur, M., Teplitz, H., ...
We present Spitzer Space Telescope mid-infrared spectra of 12 Seyfert 1.8 and 1.9 galaxies over the 5-38 um region. We compare the spectral characteristics of this sample to those of 58 Seyfert 1 and...
The Variable X-ray Spectrum of Markarian 766 - II. Time-Resolved Spectroscopy (2007)
Turner, T. J., Miller, L., Reeves, J. N., Kraemer, S. B.
CONTEXT: The variable X-ray spectra of AGN systematically show steep power-law high states and hard-spectrum low states. The hard low state has previously been found to be a component with only weak...
Kraemer, S. B., Bottorff, M. C., Crenshaw, D. M.
We present a photoionization model study of the effects of micro-turbulence and dissipative heating on emission lines for number and column densities, elemental abundances, and ionizations typical...
Dunn, Jay P., Crenshaw, D. Michael, Kraemer, S. B., Gabel, J. R.
We present a survey of 72 Seyfert galaxies and quasars observed by the it Far Ultraviolet Spectroscopic Explorer (FUSE). We have determined that 72 of 253 available active galactic nuclei (AGN)...
A Photoionization Model For The Soft X-Ray Spectrum Of NGC 4151 (2007)
Armentrout, B. K., Kraemer, S. B., Turner, T. J.
We present analysis of archival data from multiple XMM-Newton observations of the Seyfert 1 galaxy NGC 4151. Spectral data from the RGS instruments reveal several strong soft X-ray emission lines,...
Mass Outflow from the Nucleus of the Seyfert 1 Galaxy NGC 4151 (2006)
Crenshaw, D. M., Kraemer, S. B.
We present an analysis of UV and optical spectra of NGC 4151 obtained at high spectral and angular resolutions with the Hubble Space Telescope's (HST's) Space Telescope Imaging Spectrograph (STIS)....
The variable X-ray spectrum of Markarian 766 - I. Principal components analysis (2006)
Miller, L., Turner, T. J., Reeves, J. N., George, I. M., Kraemer, S. B., Wingert, B.
Aims: We analyse a long XMM-Newton spectrum of the narrow-line Seyfert 1 galaxy Mrk 766, using the marked spectral variability on timescales >20ks to separate components in the X-ray spectrum....
Dynamics of the Narrow-Line Region in the Seyfert 2 Galaxy NGC 1068 (2006)
Das, V., Crenshaw, D. M., Kraemer, S. B.
We present dynamical models based on a study of high-resolution long-slit spectra of the narrow-line region (NLR) in NGC 1068 obtained with the Space Telescope Imaging Spectrograph (STIS) aboard The...
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 Cloudy/Xspec Interface (2006)
Porter, R. L., Ferland, G. J., Kraemer, S. B., Armentrout, B. K., Arnaud, K. A., Turner, T. J.
We discuss new functionality of the spectral simulation code CLOUDY which allows the user to calculate grids with one or more initial parameters varied and formats the predicted spectra in the...
Das, V., Crenshaw, D. M., Deo, R. P., Kraemer, S. B.
We present a study of high-resolution long-slit spectra of the narrow-line region (NLR) in NGC 1068 obtained with the Space Telescope Imaging Spectrograph (STIS) aboard The Hubble Space Telescope...
The Host Galaxies of Narrow-Line Seyfert 1s: Nuclear Dust Morphology and Starburst Rings (2006)
Deo, R. P., Crenshaw, D. M., Kraemer, S. B.
We present a study of the nuclear morphology of a sample of narrow- and broad-line Seyfert 1 galaxies (NLS1's and BLS1's) based on broad-band images in the Hubble Space Telescope archives. In our...
Ionization structure of the warm wind in NGC 5548 (2005)
Steenbrugge, K. C., Kaastra, J. S., Crenshaw, D. M., Kraemer, S. B., Arav, N., George, I. M., ...
We present the results from our 140 ks XMM-Newton and 500 ks Chandra observation of NGC 5548. The velocity structure of the X-ray absorber is consistent with the velocity structure measured in the...
The Spectral Energy Distribution of the Seyfert galaxy Ton S180 (2005)
Turner, T. J., Romano, P., Kraemer, S. B., George, I. M., Yaqoob, T., Crenshaw, D. M., ...
We present spectral results from a multi-satellite, broad-band campaign on the Narrow-line Seyfert 1 galaxy Ton S180 performed at the end of 1999. We discuss the spectral-energy distribution of the...
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...
Mapping the Kinematics of the Narrow-Line Region in the Seyfert Galaxy NGC 4151 (2005)
Das, V., Crenshaw, D. M., Hutchings, J. B., Deo, R. P., Kraemer, S. B., Gull, T. R., ...
Using The Hubble Space Telescope's Space Telescope Imaging Spectrograph HST's STIS, observations of the OIII emission from the narrow-line region (NLR) of NGC 4151 were obtained and radial velocities...
Probing the Ionizing Continuum of Narrow-Line Seyfert 1 Galaxies. I.Observational Results (2005)
Dietrich, M., Crenshaw, D. M., Kraemer, S. B.
We present optical spectra and emission-line ratios of 12 Narrow-Line Seyfert 1 (NLS1) galaxies that we observed to study the ionizing EUV continuum. A common feature in the EUV continuum of active...
The Connection between the Narrow-Line Region and the UV Absorbers in Seyfert Galaxies (2005)
Crenshaw, D. M., Kraemer, S. B.
We present evidence that the outflowing UV absorbers in Seyfert 1 galaxies arise primarily in their inner narrow (emission) line regions (NLRs), based on similarities in their locations, kinematics,...
Steenbrugge, K. C., Kaastra, J. S., Crenshaw, D. M., Kraemer, S. B., Arav, N., George, I. M., ...
We present the results from a 500 ks Chandra observation of the Seyfert 1 galaxy NGC 5548. We detect broadened emission lines of O VII and C VI in the spectra, similar to those observed in the...
Ruiz, J. R., Crenshaw, D. M., Kraemer, S. B., Bower, G. A., Gull, T. R., Hutchings, J. B., ...
We present slitless spectra of 10 Seyfert galaxies observed with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. The spectra cover the [OIII] 4959, 5007 emission lines at a...
Complex X-ray Absorption and the Fe Kalpha Profile in NGC 3516 (2004)
Turner, T. J., Kraemer, S. B., George, I. M., Reeves, J. N., Bottorff, M. C.
We present data from simultaneous Chandra, XMM-Newton and BeppoSAX observations of the Seyfert 1 galaxy NGC 3516, taken during 2001 April and Nov. We have investigated the nature of the very flat...
Crenshaw, D. M., Kraemer, S. B., Gabel, J. R., Schmitt, H. R., Filippenko, A. V., Ho, L. C., ...
We present ultraviolet spectra of the dwarf Seyfert 1 nucleus of NGC 4395, obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) and the Hubble Space Telescope's Space Telescope Imaging...
Kaastra, J. S., Steenbrugge, K. C., Crenshaw, D. M., Kraemer, S. B., Arav, N., George, I. M., ...
The Seyfert 1 galaxy NGC 5548 was observed for a week by Chandra using both the HETGS and LETGS spectrometers. In this paper we study the time variability of the continuum radiation. During our...
Kraemer, S. B., George, I. M., Crenshaw, D. M., Gabel, J. R.
We have explored the relationship between the [O III] $\lambda$5007 and the 2--10 keV luminosities for a sample of Broad- and Narrow-Line Seyfert 1 galaxies (BLSy1 and NLSy1, respectively). We find...
Transient Relativistically-Shifted Lines as a Probe of Black Hole Systems (2003)
Turner, T. J., Kraemer, S. B., Reeves, J. N.
X-ray spectra of Seyfert galaxies have revealed a new type of X-ray spectral feature, one which appears to offer important new insight into the black hole system. XMM/Chandra revealed several narrow...
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...
XMM-Newton Observation of Fe Kalpha emission from a BAL QSO: Mrk 231 (2003)
We present results from a 20 ksec XMM observation of Mrk 231. EPIC data reveal strong line emission due to Fe Ka, which has rarely been detected in this class. The line energy is consistent with an...
The Host Galaxies of Narrow-Line Seyfert 1s: Evidence for Bar-Driven Fueling (2003)
Crenshaw, D. M., Kraemer, S. B., Gabel, J. R.
We present a study of the host-galaxy morphologies of narrow- and broad-line Seyfert 1 galaxies (NLS1s and BLS1s) based on broad-band optical images from the Hubble Space Telescope archives. We find...
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...
Elemental Abundances in NGC 3516 (2003)
Turner, T. J., Kraemer, S. B., Mushotzky, R. F., George, I. M., Gabel, J. R.
We present RGS data from an XMM-Newton observation of the Seyfert 1 galaxy NGC 3516, taken while the continuum source was in an extreme low state. The spectrum shows numerous emission lines including...
Crenshaw, D. M., Kraemer, S. B., Gabel, J. R., Kaastra, J. S., Steenbrugge, K. C., Brinkman, A. C., ...
We present new UV spectra of the nucleus of the Seyfert 1 galaxy NGC 5548, which we obtained with the Space Telescope Imaging Spectrograph at high spectral resolution, in conjunction with...
Probing the Complex and Variable X-ray Absorption of Markarian 6 with XMM-Newton (2003)
Immler, S., Brandt, W. N., Vignali, C., Bauer, F., Crenshaw, D. M., Feldmeier, J. J., ...
We report on an X-ray observation of the Seyfert 1.5 galaxy Mrk 6 obtained with the EPIC instruments onboard XMM-Newton. Archival BeppoSAX PDS data from 18-120 keV were also used to constrain the...
Yaqoob, T., McKernan, B., Kraemer, S. B., Crenshaw, M., Gable, J., George, I. M., ...
We observed the Seyfert 1 galaxy Mrk 509 simultaneously with Chandra/HETG, HST/STIS and RXTE. We measure strong absorption lines from He-like Ne and Mg, and from H-like N, O, and Ne. The lines are...
Kraemer, S. B., Crenshaw, D. M., Yaqoob, T., McKernan, B., Gabel, J. R., George, I. M., ...
We present observations of the UV absorption lines in the luminous Seyfert 1 galaxy Mrk 509, obtained with the medium resolution (lambda/Delta-lambda ~ 40,000) echelle gratings of the Space Telescope...
Balmer and He I absorption in the nuclear spectrum of NGC 4151 (2002)
Hutchings, J. B., Crenshaw, D. M., Kraemer, S. B., Gabel, J. R., Kaiser, M. E., Weistrop, D., ...
Spectra taken with the Space Telescope Imaging Spectrograph (STIS) allow accurate location and extraction of the nuclear spectrum of NGC 4151, with minimal contamination by extended line emission and...
Turner, T. J., Mushotzky, R. F., Yaqoob, T., George, I. M., Snowden, S. L., Netzer, H., ...
We present results from a simultaneous Chandra HETG and XMM-Newton observation of NGC 3516. We find evidence for several narrow components of Fe Kalpha along with a broad line. We consider the...
Kraemer, S. B., Crenshaw, D. M., George, I. M., Netzer, H., Turner, T. J., Gabel, J. R.
We present observations of the UV absorption lines in the Seyfert 1 galaxy NGC 3516, obtained at a resolution of $\lambda$/$\Delta\lambda$ $\approx$ 40,000 with the Space Telescope Imaging...
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...
The Density and Location of the X-ray Absorbing Gas in NGC 3516 (2001)
Netzer, H., Chelouche, D., George, I. M., Turner, T. J., Crenshaw, D. M., Kraemer, S. B., ...
A new Chandra observation and archival observations by ASCA are used to investigate spectral variations in the Sy1 galaxy NGC 3516 over a period of 7 years. A large change in flux (factor ~50 at...
The Detection of Circumnuclear X-ray Emission from the Seyfert Galaxy NGC 3516 (2001)
George, I. M., Turner, T. J., Netzer, H., Kraemer, S. B., Ruiz, J., Chelouche, D., ...
We present the first high-resolution, X-ray image of the circumnuclear regions of the Seyfert 1 galaxy NGC 3516, using the Chandra X-ray Observatory (CXO). All three of the CXO observations reported...
The Spectral Energy Distribution of the Seyfert galaxy Ton S180 (2001)
Turner, T. J., Romano, P., Kraemer, S. B., George, I. M., Yaqoob, T., Crenshaw, D. M., ...
We present spectral results from a multi-satellite, broad-band campaign on the Narrow-line Seyfert 1 galaxy Ton S180 performed at the end of 1999. We discuss the spectral-energy distribution of the...
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...
On the Nature of Intrinsic Absorption in Reddened Seyfert 1 Galaxies (2001)
Crenshaw, D. M., Kraemer, S. B.
We discuss the origin of the ``dusty lukewarm absorber'', which we previously identified in the reddened Seyfert 1 galaxies NGC 3227 and Akn 564. This absorber is characterized by saturated UV...
Kinematics of the Narrow-Line Region in the Seyfert 2 Galaxy Mrk 3 (2001)
Ruiz, Jose R., Crenshaw, D. M., Kraemer, S. B., Bower, G. A., Gull, T. R., Hutchings, J. B., ...
We present measurements of radial velocities for the narrow-line region gas (NLR) in the Seyfert 2 galaxy Mrk 3 out to ~1 kpc from the nucleus. The observations consist of two datasets, both using...
STIS Echelle Observations of the Intrinsic UV Absorption in the Seyfert 1 Galaxy NGC 3783 (2001)
Kraemer, S. B., Crenshaw, D. M., Gabel, J. R.
We present observations of the UV absorption lines in the Seyfert 1 galaxy NGC 3783, obtained with the medium resolution echelle gratings of the Space Telescope Imaging Spectrograph(STIS) on the...
Absorption and Reddening in the Seyfert Galaxy NGC 3227 (2001)
Crenshaw, D. M., Kraemer, S. B., Bruhweiler, F. C., Ruiz, J. R.
We have obtained low-dispersion spectra of NGC 3227 with the Space Telescope Imaging Spectrograph (STIS) to study the intrinsic UV absorption and the reddening of the nucleus in this Seyfert 1...
Kraemer, S. B., Crenshaw, D. M., Hutchings, J. B., George, I. M., Danks, A. C., Gull, T. R., ...
We have examined the physical conditions in intrinsic UV-absorbing gas in the Seyfert galaxy NGC 4151, using echelle spectra obtained with the Space Telescope Imaging Spectrograph (STIS). We confirm...
The Spectral Energy Distribution of the Seyfert galaxy Ton S180 (2001)
Turner, T. J., Romano, P., Kraemer, S. B., George, I. M., Yaqoob, T., Crenshaw, D. M., ...
We present spectral results from a multi-satellite, broad-band campaign on the Narrow-line Seyfert 1 galaxy Ton S180 performed at the end of 1999. We discuss the spectral-energy distribution of the...
The Spectral Energy Distribution of the Seyfert galaxy Ton S180 (2001)
Turner, T. J., Romano, P., Kraemer, S. B., George, I. M., Yaqoob, T., Crenshaw, D. M., ...
We present spectral results from a multi-satellite, broad-band campaign on the Narrow-line Seyfert 1 galaxy Ton S180 performed at the end of 1999. We discuss the spectral-energy distribution of the...
STIS Echelle Observations of NGC 4151: Variable Ionization of the Intrinsic UV Absorbers (2000)
Crenshaw, D. M., Kraemer, S. B., Hutchings, J. B., Danks, A. C., Gull, T. R., Kaiser, M. E., ...
We present echelle observations of the intrinsic UV absorption lines in the Seyfert galaxy NGC 4151, which were obtained with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space...
A Kinematic Model for the Narrow-Line Region in NGC 4151 (2000)
Crenshaw, D. M., Kraemer, S. B., Hutchings, J. B., Bradley II, L. D., Gull, T. R., Kaiser, M. E., ...
We present a simple kinematic model for the narrow-line region (NLR) of the Seyfert 1 galaxy NGC 4151, based on our previous observations of extended [O III] emission with the Space Telescope Imaging...
Resolved Spectroscopy of the Narrow-Line Region in NGC 1068: Kinematics of the Ionized Gas (2000)
Crenshaw, D. M., Kraemer, S. B.
We have determined the radial velocities of the [O III] emitting gas in the inner narrow-line region (NLR) of the Seyfert 2 galaxy NGC 1068, along a slit at position angle of 202 degrees, from STIS...
On The Reddening in X-ray Absorbed Seyfert 1 Galaxies (2000)
Kraemer, S. B., George, I. M., Turner, T. J., Crenshaw, D. M.
There are several Seyfert galaxies for which there is a discrepancy between the small column of neutral hydrogen deduced from X-ray observations and the much greater column derived from the reddening...
HST Observations and Photoionization Modeling of the LINER Galaxy NGC 1052 (2000)
Gabel, J. R., Bruhweiler, F. C., Crenshaw, D. M., Kraemer, S. B., Miskey, C. L.
We present a study of available Hubble Space Telescope (HST) spectroscopic and imaging observations of the low ionization nuclear emission line region (LINER) galaxy NGC 1052. The WFPC2 imagery...
Crenshaw, D. M., Kraemer, S. B.
We present the first long-slit spectra of the Seyfert 2 galaxy NGC 1068 obtained by the Space Telescope Imaging Spectrograph (STIS); the spectra cover the wavelength range 1150 - 10,270 Angstroms at...
Kraemer, S. B., Crenshaw, D. M.
The physical conditions near the optical continuum peak (``hot spot'') in the inner narrow line region (NLR) of the Seyfert 2 galaxy, NGC 1068. Spectra were taken with HST/STIS through the 0.1X52...
Kraemer, S. B., Crenshaw, D. M., Hutchings, J. B., Gull, T. R., Kaiser, M. E., Nelson, C. H., ...
We have examined the physical conditions in the narrow-line region of the well-studied Seyfert galaxy NGC 4151, using long-slit spectra obtained with the Hubble Space Telescope/Space Telescope...
Nelson, C. H., Weistrop, D., Hutchings, J. B., Crenshaw, D. M., Gull, T. R., Kaiser, M. E., ...
Longslit spectra of the Seyfert galaxy NGC 4151 from the UV to near infrared have been obtained with STIS to study the kinematics and physical conditions in the NLR. The kinematics show evidence for...
High Velocity Line Emission in the NLR of NGC 4151 (1999)
Hutchings, J. B., Crenshaw, D. M., Danks, A. C., Gull, T. R., Kraemer, S. B., Nelson, C. H., ...
Narrow-band imaging of the nuclear region of NGC 4151 with the Hubble Space Telescope is presented. The filter bandpasses isolate line emission in various high velocity ranges in several ions....
The Resolved Narrow Line Region in NGC4151 (1999)
Kaiser, M. E., Bradley II, L. D., Hutchings, J. B., Crenshaw, D. M., Gull, T. R., Kraemer, S. B., ...
We present slitless spectra of the Narrow Line Region (NLR) in NGC4151 from the Space Telescope Imaging Spectrograph (STIS) on HST, and investigate the kinematics and physical conditions of the...
Kraemer, S. B., Turner, T. J., Crenshaw, D. M., George, I. M.
We explore the effects of UV absorbing material on the shape of the EUV continuum radiation emitted by the active galactic nucleus, and on the relative strengths of emission lines, formed in the...
X-ray Observations of the Seyfert galaxy LB 1727 (1H 0419-577) (1998)
Turner, T. J., George, I. M., Nandra, K., Remillard, R. A., Leighly, K. M., Marshall, H. L., ...
We discuss the properties of the Seyfert 1.5 galaxy LB 1727, also known as 1H 0419-577, from X-ray observations obtained by ASCA and ROSAT along with optical observations from earlier epochs. ASCA...
Jenkins, E. B., Tripp, T. M., Fitzpatrick, E. L., Lindler, D., Danks, A. C., Beck, T. L., ...
The star HD72089 is located behind the Vela supernova remnant and shows a complex array of high and low velocity interstellar absorption features arising from shocked clouds. A spectrum of this star...