Karen M. Leighly, Jules P. Halpern, Edward B. Jenkins
This is the second of two papers reporting observations and analysis of the unusually bright (mb = 14.4), luminous (MB = −25.5), nearby (z = 0.192) narrow-line quasar PHL 1811. The first paper...
Emergence of a Broad-Absorption-Line Outflow in the Narrow-line Seyfert 1 Galaxy WPVS 007 (2009)
Leighly, Karen M., Hamann, Fred, Casebeer, Darrin A., Grupe, Dirk
We report results from a 2003 FUSE observation, and reanalysis of a 1996 HST observation of the unusual X-ray transient Narrow-line Seyfert 1 galaxy WPVS 007. The HST FOS spectrum revealed mini-BALs...
Grupe, Dirk, Leighly, Karen M., Komossa, Stefanie
We report on the first detection of hard X-ray photons (E>2.5 keV) in the X-ray transient Narrow-Line Seyfert 1 galaxy WPVS 007 which was the AGN with the softest X-ray spectrum during the ROSAT...
Agnwatchcontinuummonitoringof Radio-Quiet And Radio-Loud Agn (2007)
Paul Brien, Paul T. O'brien, Karen M. Leighly
The International AGN Watch has monitored a number of radio-quiet and radio-loud Active Galactic Nuclei -- the most luminous objects in the universe. We present a review of the main observational...
The Intrinsically X-ray Weak Quasar PHL 1811. II. Optical and UV Spectra and Analysis (2007)
Leighly, Karen M., Halpern, Jules P., Jenkins, Edward B., Casebeer, Darrin
This is the second of two papers reporting observations and analysis of the unusually bright (m_b=14.4), luminous (M_B=-25.5), nearby (z=0.192) narrow-line quasar PHL 1811. The first paper reported...
HUBBLE SPACE TELESCOPE ULTRAVIOLET SPECTROSCOPY OF 14 LOW-REDSHIFT QUASARS (2007)
Ganguly, Rajib, Brotherton, Michael S., Arav, Nahum, Heap, Sara R., Wisotzki, Lutz, Aldcroft, Thomas L., ...
We present low-resolution ultraviolet spectra of 14 low-redshift (zem ≤ 0:8) quasars observed with the Hubble Space Telescope STIS as part of a Snapshot project to understand the relationship...
Grupe, Dirk, Schady, Patricia, Leighly, Karen M., Komossa, Stefanie, O'Brien, Paul, Nousek, John A.
We report on the detection of UV variability and the persistence of X-ray faintness of the X-ray transient Narrow-Line Seyfert 1 galaxy WPVS 007 based on the first year of monitoring this AGN with...
Photoionization Models of the Broad-line Region (2007)
Leighly, Karen M., Casebeer, Darrin
The strong broad emission lines in the optical and UV spectra of Active Galactic Nuclei (AGN) are important for several reasons. Not only do they give us information about the structure of the AGN,...
Grupe, Dirk, Schady, Patricia, Leighly, Karen M., Komossa, Stefanie, O'Brien, Paul T., Nousek, John A.
Leighly, Karen M., Halpern, Jules P., Jenkins, Edward B., Grupe, Dirk, Choi, Jiehae, Prescott, Kimberly B.
This is the first of two papers reporting observations and analysis of the unusually bright (m_b=14.4), luminous (M_B=-25.5), nearby (z=0.192) narrow-line quasar PHL 1811, focusing on the X-ray...
Hubble Space Telescope Ultraviolet Spectroscopy of Fourteen Low-Redshift Quasars (2006)
Ganguly, Rajib, Brotherton, Michael S., Arav, Nahum, Heap, Sara R., Wisotzki, Lutz, L. Aldcroft, Thomas, ...
We present low-resolution ultraviolet spectra of 14 low redshift (z em < 0.8) quasars observed with HST/STIS as part of a Snap project to understand the relationship between quasar outflows and...
Hubble Space Telescope Ultraviolet Spectroscopy of Fourteen Low-Redshift Quasars (2006)
Ganguly, Rajib, Brotherton, Michael S., Arav, Nahum, Heap, Sara R., Wisotzki, Lutz, Aldcroft, Thomas L., ...
We present low-resolution ultraviolet spectra of 14 low redshift (z
Swift Observations of the highly X-ray variable Narrow Line Seyfert 1 galaxy RX J0148.3-2758 (2006)
Grupe, Dirk, Leighly, Karen M., Komossa, Stefanie, Schady, Patricia, O'Brien, Paul T., Burrows, Davis N., ...
We report on Swift observations of the Narrow-Line Seyfert 1 galaxy (NLS1) RX J0148.3--2758. It was observed for 41.6 ks in 2005 May and for 15.8 ks in 2005 December. On short as well as on long...
Swift observations of the highly X-ray variable narrow-line seyfert 1 galaxy RX J0148.3-2758 (2006)
Grupe, Dirk, Leighly, Karen M., Komossa, Stefanie, Schady, Patricia, O'Brien, Paul T., Burrows, David N., ...
FUSE Observation of the Narrow-line Seyfert 1 Galaxy RE 1034+39 (2005)
Casebeer, Darrin A., Leighly, Karen M., Baron, E.
We present analysis from simultaneous FUSE, ASCA, and EUVE observations, as well as a reanalysis of archival HST spectra, from the extreme Narrow-line Seyfert 1 Galaxy RE 1034+39 (KUG 1031+398). RE...
Extreme X-ray Behavior of the Low-Luminosity Active Nucleus in NGC 4395 (2005)
Moran, Edward C., Eracleous, Michael, Leighly, Karen M., Chartas, George, Filippenko, Alexei V., Ho, Luis C., ...
We present the results of a 17 ks Chandra ACIS-S observation of the nearby dwarf spiral galaxy NGC 4395. Chandra affords the first high-quality, broadband X-ray detection of the active nucleus of...
X-ray Periodicity in AGN (2004)
Significant (marginal) detections of periodic signals have been recently reported in 3 (4) Active Galactic Nuclei. Three of the detections were obtained from long EUVE light curves of...
An XMM-Newton Observation of the Seyfert 2 Galaxy NGC 6300. I. The Nucleus (2004)
Matsumoto, Chiho, Nava, Aida, Maddox, Larry A., Leighly, Karen M., Grupe, Dirk, Awaki, Hisamitsu, ...
We present results from a half-day observation by XMM-Newton of the nucleus of the nearby Seyfert 2 galaxy NGC 6300. The X-ray spectrum of the nucleus consists of a heavily absorbed hard component...
Leighly, Karen M., Moore, John R.
We present results from analysis of spectra from a sample of ~900 quasars from the Sloan Digital Sky Survey. These objects were selected for their intermediate redshift (1.2
The Spectral Energy Distributions of Narrow-line Seyfert 1 Galaxies (2004)
Narrow-line Seyfert 1 galaxies are identified by their uniform optical spectral properties. Studies of samples of NLS1s reveal, however, a range of X-ray spectral and variability behavior, and UV...
PHL 1811: The Local Prototype of the Lineless High-z SDSS QSOs (2004)
Leighly, Karen M., Halpern, Jules P., Jenkins, Edward B.
Abridged) In the SDSS, several unusual QSOs have been discovered that have very blue rest-frame UV spectra but no discernible emission lines. Their UV spectra strongly resemble that of the newly...
We present modeling to explore the conditions of the broad-line emitting gas in two extreme Narrow-line Seyfert 1 galaxies, using the observational results described in the first paper of this...
Leighly, Karen M., Moore, John R.
We present HST STIS observations of two extreme NLS1s, IRAS 13224-3809 and 1H 0707-495. The spectra are characterized by very blue continua, broad, strongly blueshifted high-ionization lines...
A Chandra HETGS observation of the Narrow-line Seyfert 1 galaxy Ark 564 (2003)
Matsumoto, Chiho, Leighly, Karen M., Marshall, Herman L.
We present results from a 50 ks observation of the narrow-line Seyfert 1 galaxy Ark 564 with the Chandra HETGS. The spectra above 2 keV are modeled by a power-law with a photon-index of 2.56+/-0.06....
Absorption-Line Systems and Galaxies in Front of the Second Brightest Quasar, PHL 1811 (2003)
Jenkins, Edward B., Bowen, David V., Tripp, Todd M., Sembach, Kenneth R., Leighly, Karen M., Halpern, Jules P., ...
The extraordinarily bright quasar PHL 1811 at a redshift z = 0.192 provides an attractive opportunity to use ultraviolet absorption-line spectroscopy to study the properties of gas systems in the...
A Chandra Observation of the Luminous NLS1 1H 0707-495 (2002)
Leighly, Karen M., Zdziarski, Andrzej A., Kawaguchi, Toshihiro, Matsumoto, Chiho
We present preliminary results from a long Chandra HETG observation of the luminous Narrow-line Seyfert 1 galaxy 1H 0707-495. We find a complex X-ray spectrum comprised of a two-component continuum...
NGC 4151: an intrinsically average Seyfert 1 (2001)
Zdziarski, Andrzej A., Leighly, Karen M., Matsuoka, Masaru, Cappi, Massimo, Mihara, Tatehiro
We present a detailed analysis of a long, 100 ksec, observation of NGC 4151 by ASCA, contemporaneous with an observation by the CGRO/OSSE. We fit the data with physical models including an Fe K line...
STIS Ultraviolet Spectral Evidence for Outflows in Extreme Narrow-Line Seyfert 1 Galaxies (2000)
(abridged) I present and discuss the results of HST STIS observations of IRAS 13224-3809 and 1H 0707-495, two narrow-line Seyfert 1 (NLS1) galaxies. We discovered that high-ionization UV emission...
ASCA Observations of NLS1s (2000)
The study of NLS1s using ASCA has many advantages. A representative sample can be studied; to date, observations of more than 30 NLS1s have been made. ASCA observations are conducted contiguously, so...
(Abridged) I present a comprehensive and uniform analysis of 25 {\it ASCA} observations from 23 Narrow-line Seyfert 1 galaxies. The time series analysis is presented in this paper, Part 1, and the...
(Abridged) I present a comprehensive and uniform analysis of 25 {\it ASCA} observations from 23 Narrow-line Seyfert 1 galaxies. The spectral analysis and correlations are presented in this paper,...
Forster, Karl, Leighly, Karen M., Kay, Laura E.
The X-ray spectra of two intermediate type Seyfert galaxies are investigated using ASCA observations separated by more than a year. Both NGC 4388 and ESO 103-G35 exhibit strong, narrow Fe K alpha...
Absorption and scattering properties in polarized bright soft X-ray selected ROSAT AGN (1998)
Grupe, D., Wills, Beverley J., Wills, D., Leighly, Karen M.
We have surveyed the optical linear polarimetric properties of 65 soft X-ray selected ROSAT Active Galactic Nuclei (AGN). Most of these sources show low polarization (
The Optical Polarization and Warm Absorber in IRAS 17020+4544 (1997)
Leighly, Karen M., Kay, Laura E., Wills, Beverley J., Wills, D., Grupe, Dirk
We report the detection of ionized absorption in the ASCA spectrum of the narrow-line Seyfert 1 galaxy IRAS 17020+4544. Subsequent optical spectropolarimetry revealed high polarization increasing...
Evidence for Relativistic Outflows in Narrow-line Seyfert 1 Galaxies (1997)
Leighly, Karen M., Mushotzky, Richard F., Nandra, Kirpal, Forster, Karl
We report the observation of features near 1 keV in the ASCA spectra from three ``Narrow Line Seyfert 1'' (NLS1) galaxies. We interpret these as oxygen absorption in a highly relativistic outflow. If...
X-ray Observations of the Broad-Line Radio Galaxy 3C 390.3 (1997)
Leighly, Karen M., O'Brien, Paul T., Edelson, Rick, George, Ian M., Malkan, Matthew A., Matsuoka, Masaru, ...
We present the data and preliminary analysis for a series of 90 ROSAT HRI and two ASCA observations of the broad-line radio galaxy 3C 390.3. These data were obtained during the period 1995 January 2...
AGN Watch Continuum Monitoring of Radio-quiet and Radio-loud AGN (1997)
O'Brien, Paul T., Leighly, Karen M.
The International AGN Watch has monitored a number of radio-quiet and radio-loud Active Galactic Nuclei - the most luminous objects in the universe. We present a review of the main observational...