Petry, C. E., Impey, C. D., Fenton, J. L., Foltz, C. B.
We present spectroscopic observations for quasars Q0107-025A, Q0107-025B, and Q0107-0232. For the first time, all data obtained with the Hubble Space Telescope's GHRS and FOS for these three quasars...
An Extraordinary Scattered Broad Emission Line in a Type 2 QSO (2002)
Schmidt, G. D., Smith, P. S., Foltz, C. B., Hines, D. C.
An infrared-selected, narrow-line QSO has been found to exhibit an extraordinarily broad Halpha emission line in polarized light. Both the extreme width (35,000 km/sec full-width at zero intensity)...
Continuum and Emission Line Strength Relations for a large Active Galactic Nuclei Sample (2002)
Dietrich, M., Hamann, F., Shields, J. C., Constantin, A., Vestergaard, M., Chaffee, F., ...
We report on the analysis of a large sample of 744 type 1 Active Galactic Nuclei, including quasars and Seyfert 1 galaxies across the redshift range from 0 < z < 5 and spanning nearly 6 orders of...
LBQS 0015+0239: A Binary Quasar with Small Angular Separation (2002)
Impey, C. D., Petry, C. E., Foltz, C. B., Hewett, P. C., Chaffee, F. H.
We present spectroscopic observations with Keck/LRIS of LBQS 0015+0239, a pair of quasars at z = 2.45 with a separation of $\Delta\theta = 2.2$ arcsec (projected linear distance of 17.8 $h_{70}^{-1}$...
Detection of superhumps in XTE J1118+480 approaching quiescence (2002)
Zurita, C., Casares, J., Shahbaz, T., Wagner, R. M., Foltz, C. B., Rodriguez-Gil, P., ...
We present the results of our monitoring of the halo black-hole soft X-ray transient (SXT) XTE J1118+480 during its decline to quiescence. The system has decayed 0.5 mags from December 2000 to its...
The evolutionary status of the low-metallicity blue compact dwarf galaxy SBS 0940+544 (2001)
Guseva, N. G., Izotov, Y. I., Papaderos, P., Chaffee, F. H., Foltz, C. B., Green, R. F., ...
We present the results of spectrophotometry and V,R,I, Halpha CCD photometry of the blue compact dwarf (BCD) galaxy SBS 0940+544. Broad-band images taken with the 2.1m KPNO and 1.23m Calar Alto...
A spectroscopic study of component C and the extended emission around I Zw 18 (2001)
Izotov, Y. I., Chaffee, F. H., Foltz, C. B., Thuan, T. X., Green, R. F., Papaderos, P., ...
Long-slit Keck II, 4m Kitt Peak, and 4.5m MMT spectrophotometric data are used to investigate the stellar population and the evolutionary status of I Zw 18C, the faint C component of the nearby blue...
High Resolution Spectra of Quasar AALs: 3C 191 (2001)
Hamann, Frederick W., Barlow, T. A., Chaffee, F. C., Foltz, C. B., Weymann, R. J.
We discuss new high-resolution (6.7 km/s) spectra of the associated absorption lines (AALs) in the radio-loud quasar 3C 191. The measured AALs have ionizations ranging from Mg I to N V, and...
The Halo Black-Hole X-ray Transient XTE J1118+480 (2001)
Wagner, R. M., Foltz, C. B., Shahbaz, T., Casares, J., Charles, P. A., Starrfield, S. G., ...
Optical spectra were obtained of the optical counterpart of the high latitude soft X-ray transient XTE J1118+480 near its quiescent state with the new 6.5 m MMT and the 4.2 m WHT. The spectrum...
High-Resolution Keck Spectra of the Associated Absorption Lines in 3C 191 (2000)
Hamann, Frederick W., Barlow, T. A., Chaffee, F. C., Foltz, C. B., Weymann, R. J.
Associated absorption lines (AALs) are valuable probes of the gaseous environments near quasars. Here we discuss high-resolution (6.7 km/s) spectra of the AALs in the radio-loud quasar 3C 191...
Observations of Lyman-alpha Absorption in a Triple Quasar System (2000)
Young, P. A., Impey, C. D., Foltz, C. B.
We have obtained follow-up observations of the quasar pair LBQS 0107-025A,B and new observations of the nearby quasar LBQS 0107-0232 with the Hubble Space Telescope Faint Object Spectrograph....
The FIRST Bright Quasar Survey. II. 60 Nights and 1200 Spectra Later (1999)
White, R. L., Becker, R. H., Gregg, M. D., Laurent-Muehleisen, S. A., Brotherton, M. S., Impey, C. D., ...
We have used the VLA FIRST survey and the APM catalog of the POSS-I plates as the basis for constructing a new radio-selected sample of optically bright quasars. This is the first radio-selected...
The KX method for producing K-band flux-limited samples of quasars (1999)
Warren, S. J., Hewett, P. C., Foltz, C. B.
The longstanding question of the extent to which the quasar population is affected by dust extinction, within host galaxies or galaxies along the line of sight, remains open. More generally, the...
Helium abundance in the most metal-deficient blue compact galaxies: I Zw 18 and SBS 0335-052 (1999)
Izotov, Y. I., Chaffee, F. H., Foltz, C. B., Green, R. F., Guseva, N. G., Thuan, T. X.
We present high-quality spectroscopic observations of the two most-metal deficient blue compact galaxies known, I Zw 18 and SBS 0335-052 to determine the helium abundance. The underlying stellar...
Is I Zw 18 a young galaxy? (1999)
Izotov, Y. I., Papaderos, P., Thuan, T. X., Fricke, K. J., Foltz, C. B., Guseva, N. G.
Hubble Space Telescope (HST) colour - magnitude diagrams in B, V and R along with long-slit Multiple Mirror Telescope (MMT) spectrophotometric data are used to investigate the evolutionary status of...
The young age of the extremely metal-deficient blue compact dwarf galaxy SBS 1415+437 (1999)
Thuan, T. X., Izotov, Y. I., Foltz, C. B.
We use Multiple Mirror Telescope (MMT) spectrophotometry and Hubble Space Telescope (HST) Faint Object Spectrograph (FOS) spectra and Wide Field and Planetary Camera 2 (WFPC2) V and I images to study...
Red and Blue Shifted Broad Lines in Luminous Quasars (1999)
McIntosh, D. H., Rieke, M. J., Foltz, C. B.
We have observed a sample of 22 luminous quasars, in the range 2.0
SBS 0335-052W - an Extremely Low Metallicity Dwarf Galaxy (1999)
Lipovetsky, V. A., Chaffee, F. H., Izotov, Y. I., Foltz, C. B., Kniazev, A. Y., Hopp, U.
We present Multiple Mirror Telescope (MMT) and Keck II telescope spectrophotometry and 3.5m Calar Alto telescope R, I photometry of the western component of the extremely low-metallicity blue compact...
McIntosh, D. H., Rieke, M. J., Foltz, C. B., Weymann, R. J.
We have obtained H-band spectra of 32 luminous quasars at 2.0
Dietrich, M., Peterson, B.M., Albrecht, P., Altmann, M., Barth, A.J., Bennie, P.J., ...
Results of a ground-based optical monitoring campaign on 3C 390.3 in 1994-1995 are presented. The broadband fluxes (B, V , R, and I), the spectrophotometric optical continuum flux Fλ(5177 Ã ),...
Dietrich, M, Peterson, B. M, Albrecht, P, Altmann, M, Barth, A. J, Bennie, P. J, ...
Results of a ground-based optical monitoring campaign on 3C 390.3 in 1994-1995 are presented. The broadband fluxes (B, V, R, and I), the spectrophotometric optical continuum flux F lambda (5177 A),...
Microlensing induced spectral variability in Q2237+0305 (1997)
Lewis, G. F., Irwin, M. J., Hewett, P. C., Foltz, C. B.
We present both photometry and spectra of the individual images of the quadruple gravitational lens system Q2237+0305. Comparison of spectra obtained at two epochs, separated by $\sim~3\,$years,...
A spectroscopic study of UM 673 A and B - On the size of Lyman-alpha clouds (1992)
Smette, A, Surdej, Jean, Shaver, P A, Foltz, C B, Chaffee, F H, Weymann, R J, ...
The Ly-alpha forest spectra obtained for the A and B images of the gravitationally lensed high-redshift quasar UM 673 are investigated, and higher resolution data of the brightest (A) image are...
A Spectroscopic Study of UM673 A &B: on the size of Lyman- alpha Clouds (1991)
Smette, A, Surdej, Jean, Shaver, P A, Foltz, C B, Chaffee, F H, Weymann, R J, ...
Quasar Absorption Lines, Proceedings of the ESO Mini-Workshop held
Preliminary analysis of high-resolution spectra for UM 673 A & B (1990)
Smette, A, Surdej, Jean, Shaver, P A, Foltz, C B, Magain, Pierre
"Gravitational lensing"