Paul S. Smith

Evidence for Dynamical Changes in a Transitional Protoplanetary Disk with Mid-infrared Variability (2009)

Muzerolle, James, Flaherty, Kevin, Balog, Zoltan, Furlan, Elise, Smith, Paul S., Allen, Lori, ...

We present multi-epoch Spitzer Space Telescope observations of the transitional disk LRLL 31 in the 2-3 Myr-old star forming region IC 348. Our measurements show remarkable mid-infrared variability...

Probing the Geometry and Circumstellar Environment of SN 1993J in M81 (2009)

Hien D. Tran, Garyd. Schmidt, Karen S. Bjorkman, Buellt. Jannuzi, Paul S. Smith

We have monitored the polarized radiation of the Type IIb SN 1993J in M81 over a period of 41 days, starting from 7 days after the explosion on 1993 March 27.5 (UT). Our data show clear evidence that...

High-Redshift SDSS Quasars with Weak Emission Lines (2009)

Diamond-Stanic, Aleksandar M., Fan, Xiaohui, Brandt, W. N., Shemmer, Ohad, Strauss, Michael A., Anderson, Scott F., ...

We identify a sample of 74 high-redshift quasars (z>3) with weak emission lines from the Fifth Data Release of the Sloan Digital Sky Survey and present infrared, optical, and radio observations of a...

The Spectral Energy Distributions of Red Two Micron All Sky Survey Active Galactic Nuclei (2009)

Kuraszkiewicz, Joanna, Wilkes, Belinda J., Schmidt, Gary, Ghosh, Himel, Smith, Paul S., Cutri, Roc, ...

We present infrared (IR) to X-ray spectral energy distributions (SEDs) for 44 red active galactic nuclei (AGNs) selected from the Two Micron All Sky Survey (2MASS) survey on the basis of their red J...

Principal Component Analysis of the Spectral Energy Distribution and Emission Line Properties of Red 2MASS Active Galactic Nuclei (2009)

Kuraszkiewicz, Joanna, Wilkes, Belinda J., Schmidt, Gary, Smith, Paul S., Cutri, Roc M., Czerny, Bόzena

We analyze the spectral energy distributions (SEDs) and emission-line properties of the red (J – K_S >2) 2MASS active galactic nuclei (AGNs) using principle component analysis (PCA). The sample...

The Spectral Energy Distributions of Red 2MASS AGN (2008)

Kuraszkiewicz, Joanna, Wilkes, Belinda J., Schmidt, Gary, Ghosh, Himel, Smith, Paul S., Cutri, Roc, ...

We present infrared (IR) to X-ray spectral energy distributions (SEDs) for 44 red AGN selected from the 2MASS survey on the basis of their red J-K$_S$ color (>2 mag) and later observed by Chandra. In...

PCA of the spectral energy distribution and emission line properties of red 2MASS AGN (2008)

Kuraszkiewicz, Joanna, Wilkes, Belinda J., Schmidt, Gary, Smith, Paul S., Cutri, Roc, Czerny, Bozena

We analyze the spectral energy distributions (SEDs) and emission line properties of the red (J-K$_S$ > 2) 2MASS AGN observed by Chandra using principle component analysis. The sample includes 44 low...

A Possible Icy Kuiper Belt around HD 181327 (2008)

Chen, Christine H., Fitzgerald, Michael P., Smith, Paul S.

We have obtained a Gemini South T-ReCS Qa-band (18.3 micron) image and a Spitzer MIPS SED-mode observation of HD181327, an F5/F6V member of the ~12 Myr old beta Pictoris moving group. We resolve the...

The inner jet of an active galactic nucleus as revealed by a radio-to-gamma-ray outburst (2008)

Marscher, Alan P., Jorstad, Svetlana G., D'Arcangelo, Francesca D., Smith, Paul S., Williams, G. Grant, Larionov, Valeri M., ...

Blazars are the most extreme active galactic nuclei. They possess oppositely directed plasma jets emanating at near light speeds from accreting supermassive black holes. According to theoretical...

Absolute calibration and characterization of the multiband imaging photometer for Spitzer. IV. The spectral energy distribution mode (2008)

Lu, Nanyao, Smith, Paul S., Engelbracht, Charles W., Noriega-Crespo, Alberto, Morrison, Jane, Gordon, Karl D., ...

The spectral energy distribution (SED) mode of the Multiband Imaging Photometer for Spitzer (MIPS) aboard the Spitzer Space Telescope provides low-spectral resolution (R ≈ 15–25) spectroscopy in...

Preprint typeset using L A T E X style emulateapj v. 20/04/00 DISCOVERY OF A Z=4.93, X-RAY SELECTED QUASAR BY THE CHANDRA MULTIWAVELENGTH PROJECT (CHAMP) (2007)

John D. Silverman, Paul J. Green, Dong-woo Kim, Belinda J. Wilkes, Robert A, David Morris, ...

We present X-ray and optical observations of CXOMP J213945.0-234655, a high redshift (z = 4:93) quasar discovered through the Chandra Multiwavelength Project (ChaMP). This object is the most distant...

Aromatic Features in AGN: Star-Forming Infrared Luminosity Function of AGN Host Galaxies (2007)

Shi, Yong, Ogle, Patrick, Rieke, George H., Antonucci, Robert, Hines, Dean C., Smith, Paul S., ...

We describe observations of aromatic features at 7.7 and 11.3 um in AGN of three types including PG, 2MASS and 3CR objects. The feature has been demonstrated to originate predominantly from star...

Multiwaveband Polarimetric Observations of 15 Active Galactic Nuclei at High Frequencies: Correlated Polarization Behavior (2007)

Jorstad, Svetlana G., Marscher, Alan P., Stevens, Jason A., Smith, Paul S., Forster, James R., Gear, Walter K., ...

We report on multi-frequency linear polarization monitoring of 15 active galactic nuclei containing highly relativistic jets with apparent speeds from $\sim$4 $c$ to $>40c$. The measurements were...

Highly Polarized Optically-Selected BL Lacertae Objects (2007)

Smith, Paul S., Williams, G. Grant, Schmidt, Gary D., Diamond-Stanic, Aleksandar M., Means, Dennis L.

Observations of candidate BL Lacertae objects spectroscopically selected from the Sloan Digital Sky Survey (SDSS) reveal a large fraction with high polarization (P > 3%). This result confirms that...

Rapid Multiwaveband Polarization Variability in the Quasar PKS 0420-014: Optical Emission from the Compact Radio Jet (2007)

Darcangelo, Francesca D., Marscher, Alan P., Jorstad, Svetlana G., Smith, Paul S., Larionov, Valeri M., Hagen-Thorn, Vladimir A., ...

An 11-day monitoring campaign in late 2005 reveals clear correlation in polarization between the optical emission and the region of the intensity peak (the "pseudocore") at the upstream end of the...

Aromatic features in AGNs: star-forming infrared luminosity function of AGN host galaxies (2007)

Shi, Yong, Ogle, Patrick, Rieke, George H., Antonucci, Robert, Hines, Dean C., Smith, Paul S., ...

We describe observations of aromatic features at 7.7 and 11.3 mum in AGNs of three types, including PG, 2MASS, and 3CR objects. The feature has been demonstrated to originate predominantly from star...

Hot DB White Dwarfs from the Sloan Digital Sky Survey (2006)

Eisenstein, Daniel J., Liebert, James, Koester, Detlev, Kleinmann, S. J., Nitta, Atsuko, Smith, Paul S., ...

We present ugriz photometry and optical spectroscopy for 28 DB and DO white dwarfs with temperatures between 28,000K and 45,000K. About 10 of these are particularly well-observed; the remainder are...

Spitzer Far-Infrared Detections of Cold Circumstellar Disks (2006)

Smith, Paul S., Hines, Dean C., Low, Frank J., Gehrz, Robert D., Polomski, Elisha F., Woodward, Charles E.

Observations at 70 microns with the Spitzer Space Telescope have detected several stellar systems within 65 pc of the Sun. Of 18 presumably young systems detected in this study, as many as 15 have...

Type II Quasars from the Sloan Digital Sky Survey: V. Imaging host galaxies with the Hubble Space Telescope (2006)

Zakamska, Nadia L., Strauss, Michael A., Krolik, Julian H., Ridgway, Susan E., Schmidt, Gary D., Smith, Paul S., ...

Type II quasars are luminous Active Galactic Nuclei whose centers are obscured by large amounts of gas and dust. In this paper we present 3-band HST images of nine type II quasars with redshifts 0.2...

Hosts of Type II Quasars: an HST Study (2006)

Zakamska, Nadia L., Strauss, Michael A., Krolik, Julian H., Ridgway, Susan E., Schmidt, Gary D., Smith, Paul S., ...

Type II quasars are luminous Active Galactic Nuclei whose centers are obscured by large amounts of gas and dust. In this contribution we present 3-band HST images of nine type II quasars with...

Untitled (2005)

Smith, Paul S

Watercolor painting depicting a beautiful farm house.

Variation in the Scattering Shroud Surrounding Markarian 231 (2005)

Gallagher, S. C., Schmidt, Gary D., Smith, Paul S., Brandt, W. N., Chartas, G., Hylton, Shavonne, ...

We present a detailed study of the nuclear structure of the highly polarized broad absorption line quasar, Mrk 231, through a multiwavelength campaign of Chandra observations, optical spectroscopy,...

Polarimetric Observations of 15 Active Galactic Nuclei at High Frequencies: Jet Kinematics from Bimonthly Monitoring with the Very Long Baseline Array (2005)

Jorstad, Svetlana G., Marscher, Alan P., Lister, Matthew L., Stirling, Alastair M., Cawthorne, Timothy V., Gear, Walter K., ...

We present total and polarized intensity images of 15 active galactic nuclei obtained with the Very Long Baseline Array at 7 mm at 17 epochs from 1998 March to 2001 April. At some epochs the images...

Unravelling the Puzzle of the Eclipsing Polar SDSSJ 015543.40+002807.2 with XMM and Optical Photometry/Spectropolarimetry (2004)

Schmidt, Gary D., Szkody, Paula, Homer, Lee, Smith, Paul S., Chen, Bing, Henden, Arne, ...

The cataclysmic variable SDSSJ 015543.40+002807.2 is confirmed to be a magnetic system of the AM Herculis type. With an orbital period of 87.13 min, it is also the shortest-period eclipsing Polar...

Candidate Type II Quasars from the SDSS: III. Spectropolarimetry Reveals Hidden Type I Nuclei (2004)

Zakamska, Nadia L., Schmidt, Gary D., Smith, Paul S., Strauss, Michael A., Krolik, Julian H., Hall, P. B., ...

We have conducted spectropolarimetry of 12 type II (obscured) quasar candidates selected from the spectroscopic database of the Sloan Digital Sky Survey based on their emission line properties....

Interstellar Polarization in M31 (2004)

Clayton, Geoffrey C., Wolff, Michael J., Gordon, Karl D., Smith, Paul S., Nordsieck, Kenneth H., Babler, Brian L.

The wavelength dependence of interstellar polarization due to dust in M31 has been observed along four sightlines. Only one sightline had been measured previously.The globular clusters, S78, S150,...

The Newly Active R Coronae Borealis Star, V2552 Oph (2003)

Hesselbach, E., Clayton, Geoffrey C., Smith, Paul S.

In 2001, V2552 Oph (CD -22 12017, HadV98) quickly faded by several magnitudes in a manner typical of the R Coronae Borealis (RCB) stars. Photometry of V2552 Oph obtained over 70 years previous to...

Optical Spectropolarimetry of Quasi-Stellar Objects Discovered by the Two-Micron All Sky Survey (2003)

Smith, Paul S., Schmidt, Gary D., Hines, Dean C., Foltz, Craig B.

Highly polarized QSOs discovered in the Two-Micron All Sky Survey (2MASS) have been observed to determine the source(s) of optical polarization in this near-infrared color-selected sample. Broad...

An HST/WFPC2 Snapshot Survey of 2MASS-Selected Red QSOs (2003)

Marble, Andrew R., Hines, Dean C., Schmidt, Gary D., Smith, Paul S., Surace, Jason A., Armus, Lee, ...

Using simple infrared color selection, 2MASS has found a large number of red, previously unidentified, radio-quiet QSOs. Although missed by UV/optical surveys, the 2MASS QSOs have K-band luminosities...

Evidence for Polarized Synchrotron Components in Radio-Optical Aligned Quasars (2000)

Schmidt, Gary D., Smith, Paul S.

A tendency for the axes of double-lobed radio quasars to be aligned with the electric vectors of optical polarization in the active galactic nuclei is well-known. However, the origin of the...

Intrinsic Differences in the Inner Jets of High- and Low-Optically Polarized Radio Quasars (2000)

Lister, Matthew L., Smith, Paul S.

A significant fraction of compact radio-loud quasars display most of the characteristics of relativistically beamed, high-optical polarization blazars, yet are weakly polarized in the optical regime....

Reverberation Measurements for 17 Quasars and the Size-Mass-Luminosity Relations in Active Galactic Nuclei (1999)

Kaspi, Shai, Smith, Paul S., Netzer, Hagai, Maoz, Dan, Jannuzi, Buell T., Giveon, Uriel

(abridged) We have spectrophotometrically monitored a well-defined sample of 28 Palomar-Green quasars in order to obtain measurements of their BLRs and to investigate the relationships between quasar...

Long-term optical variability properties of the Palomar-Green quasars (1999)

Giveon, Uriel, Maoz, Dan, Kaspi, Shai, Netzer, Hagai, Smith, Paul S.

We present results from a monitoring program of 42 quasars from the Palomar Green sample. The objects were observed for 7 years at the Wise Observatory, as part of a long term effort to monitor AGN...

The Polarized Spectrum of Apm 08279+5255 (1999)

Hines, Dean C., Schmidt, Gary D., Smith, Paul S.

We report the discovery of significant linear polarization (p > 1%) in the hyperluminous z=3.87 BALQSO APM~08279+5255. The polarization spectrum is complex, with properties similar to those of other,...

Transputer Implementation of the TRACE Model of Speech Recognition. (1998)

Elman, Jeffrey L., Smith, Paul S., Dolson, Mark

We describe the accomplishments of the five-year project to develop an extended version of the TRACE model of speech recognition and to port it to a Transputer platform. We begin with an over view of...

Probing the Geometry and Circumstellar Environment of SN 1993J in M81 (1997)

Tran, Hien D., Filippenko, Alexei V., Schmidt, Gary D., Bjorkman, Karen S., Jannuzi, Buell T., Smith, Paul S.

We have monitored the polarized radiation of the Type IIb SN 1993J in M81 over a period of 41 days, starting from 7 days after the explosion on 1993 March 27.5 (UT). Our data show clear evidence that...

Measurement of the Broad Line Region Size in Two Bright Quasars (1996)

Kaspi, Shai, Smith, Paul S., Maoz, Dan, Netzer, Hagai, Jannuzi, Buell. T.

We present 4 years of spectrophotometric monitoring data for two radio-quiet quasars, PG 0804+762 and PG 0953+414, with typical sampling intervals of several months. Both sources show continuum and...

Optical Detection of the Hidden Nuclear Engine in NGC~4258 (1995)

Wilkes, Belinda J., Schmidt, Gary D., Smith, Paul S., Mathur, Smita, McLeod, Kim K.

The sub-parsec masing disk recently found to be orbiting a central mass of $\sim3.6\times10^7$~\msun\ in the Seyfert/LINER galaxy NGC~4258 provides the most compelling evidence to date for the...

Detection of Extended Polarized Ultraviolet Radiation from the z = 1.82 Radio Galaxy 3C 256 (1995)

Jannuzi, Buell T., Elston, Richard, Schmidt, Gary D., Smith, Paul S., Stockman, H. S.

We have detected spatially extended linear polarized UV emission from the high-redshift radio galaxy 3C~256 ($z=1.82$). A spatially integrated ($7.8''$ diameter aperture) measurement of the degree of...

The Hidden Nuclear Spectrum of the Luminous IRAS Source FSC10214$+$4724 (1994)

Jannuzi, Buell T., Elston, Richard, Schmidt, Gary D., Smith, Paul S., Stockman, H. S.

Optical spectropolarimetry of the luminous IRAS source FSC10214$+$4724 (z$=2.286$) reveals that the strong (\twid17\%) linear polarization detected by Lawrence \etal\/ is shared by both the narrow UV...