Enhanced Star Formation in Narrow Line Seyfert 1 AGN revealed by Spitzer (2009)
Sani, E., Lutz, D., Risaliti, G., Netzer, H., Gallo, L. C., Trakhtenbrot, B., ...
We present new low resolution Spitzer mid-infrared spectroscopy of a sample of 20 ROSAT selected local Narrow Line Seyfert 1 galaxies (NLS1s). We detect strong AGN continuum in all and clear PAH...
The role of black holes in galaxy formation and evolution (2009)
Cattaneo, A., Faber, S. M., Binney, J., Dekel, A., Kormendy, J., Mushotzky, R., ...
Virtually all massive galaxies, including our own, host central black holes ranging in mass from millions to billions of solar masses. The growth of these black holes releases vast amounts of energy...
Veilleux, S., Rupke, D. S. N., Genzel, R., Sturm, E., Lutz, D., ...
We report the results from a comprehensive study of 74 ultraluminous infrared galaxies (ULIRGs) and 34 Palomar-Green (PG) quasars within z ~ 0.3 observed with the Spitzer Infrared Spectrograph (IRS)....
Veilleux, S., Rupke, D. S. N., Genzel, R., Sturm, E., Lutz, D., ...
We report the results from a comprehensive study of 74 ultraluminous infrared galaxies (ULIRGs) and 34 Palomar-Green (PG) quasars within z ~ 0.3$ observed with the Spitzer Infrared Spectrograph...
Star formation in the hosts of high-z QSOs: Evidence from Spitzer PAH detections (2008)
Lutz, D., Sturm, E., Tacconi, L. J., Valiante, E., Schweitzer, M., Netzer, H., ...
We present Spitzer rest-frame mid-infrared spectroscopy of twelve z~2 mm-bright type 1 QSOs, selected from unlensed and lensed QSO samples and covering a range of AGN optical luminosities...
Dasyra, K. M., Ho, L. C., Armus, L., Ogle, P., Helou, G., Peterson, B. M., ...
We present relations of the black hole mass and the optical luminosity with the velocity dispersion and the luminosity of the [Ne v] and the [O iv] high-ionization lines in the mid-infrared (MIR) for...
Extended silicate dust emission in PG QSOs (2008)
Schweitzer, M., Groves, B., Netzer, H., Lutz, D., Sturm, E., Contursi, A., ...
This paper addresses the origin of the silicate emission observed in PG QSOs, based on observations with the Spitzer Space Telescope. Scenarios based on the unified model suggest that silicate...
Extended silicate dust emission in Palomar-Green QSOs (2008)
Schweitzer, M., Groves, B., Netzer, H., Lutz, D., Sturm, E., Contursi, A., ...
Star formation in the hosts of high-z QSOs: evidence from Spitzer PAH detections (2008)
Lutz, D., Sturm, E., Tacconi, L. J., Valiante, E., Schweitzer, M., Netzer, H., ...
Asca Observations Of The Ionized Gas In The Seyfert Galaxy Ngc 3783 (2007)
I. M. George, T. J. Turner, George Turner Mushotzky, K. Nandra, H. Netzer
We present the results from ASCA observations of NGC 3783 carried out during 1993 and 1996. Variability is observed both between the two epochs and within the individual observations, the latter due...
The HST Sample of Radio-Loud Quasars: Emission Lines from (2007)
Beverley Wills Brotherton, Beverley J. Wills, M. S. Brotherton, D. Wills, K. L. Thompson, J. A. Baldwin, ...
g. 1 shows preliminary SPCA results, expanded on the right to show detail. The top panel shows the mean of 48 spectra between Lyff and Hfi. The second panel shows the standard deviation spectrum....
Letter to the Editor: first results from ISO (2007)
Sws Spectroscopy, D. Lutz, E. Oliva, A. Marconi, H. Netzer, ...
. We present 2.5-45¯m ISO SWS spectra of the Circinus galaxy which is one of the closest spirals containing both a visually obscured Seyfert nucleus and circumnuclear starburst activity. In addition...
Dasyra, K. M., Ho, L. C., Armus, L., Ogle, P., Helou, G., Peterson, B. M., ...
We present relations of the black hole mass and the optical luminosity with the velocity dispersion and the luminosity of the [Ne V] and the [O IV] high-ionization lines in the mid-infrared (MIR) for...
Dust covering factor, silicate emission and star formation in luminous QSOs (2007)
Maiolino, R., Shemmer, O., Imanishi, M., Netzer, H., Oliva, E., Lutz, D., ...
We present Spitzer IRS low resolution, mid-IR spectra of a sample of 25 high luminosity QSOs at 2
PAH emission and star formation in the host of the z~2.56 Cloverleaf QSO (2007)
Lutz, D., Sturm, E., Tacconi, L. J., Valiante, E., Schweitzer, M., Netzer, H., ...
We report the first detection of the 6.2micron and 7.7micron infrared `PAH' emission features in the spectrum of a high redshift QSO, from the Spitzer-IRS spectrum of the Cloverleaf lensed QSO...
PAH emission and star formation in the host of the z~2.56 cloverleaf QSO (2007)
Lutz, D., Sturm, E., Tacconi, L. J., Valiante, E., Schweitzer, M., Netzer, H., ...
Dust covering factor, silicate emission and star formation in luminous QSOs (2007)
Maiolino, R., Shemmer, O., Imanishi, M., Netzer, H., Oliva, E., Lutz, D., ...
Silicate emission in AGN: Emission from the Torus or (and) extended emission? (2007)
Schweitzer, M., Lutz, D., Sturm, E., Genzel, R., Veilleux, S., Rupke, D., ...
Mid-Infrared Diagnostics of LINERs (2006)
Sturm, E., Rupke, D., Contursi, A., Lutz, D., Netzer, H., ...
We report results from the first mid-infrared spectroscopic study of a comprehensive sample of 33 LINERs, observed with the Spitzer Space Telescope. We compare the properties of two different LINER...
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...
Schweitzer, M., Lutz, D., Sturm, E., Contursi, A., Tacconi, L. J., Lehnert, M. D., ...
This paper addresses the origin of the far-infrared (FIR) continuum of QSOs, based on the Quasar and ULIRG Evolution Study (QUEST) of nearby QSOs and ULIRGs using observations with the Spitzer Space...
Mid-infrared diagnostics of LINERS (2006)
Sturm, E., Rupke, D., Contursi, A., Kim, D. C., Lutz, D., Netzer, H., ...
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...
Peterson, B. M., Ferrarese, L., Gilbert, K. M., Kaspi, S., Malkan, M. A., Maoz, D., ...
We present improved black hole masses for 35 active galactic nuclei (AGNs) based on a complete and consistent reanalysis of broad emission-line reverberation-mapping data. From objects with multiple...
Shemmer, O., Netzer, H., Maiolino, R., Oliva, E., Croom, S., Corbett, E., ...
We present new near infrared spectroscopic measurements of the H_beta region for a sample of 29 luminous high redshift quasars. We have measured the width of H_beta in those sources, and added...
Netzer, H., Shemmer, O., Maiolino, R., Oliva, E., Croom, S., Corbett, E., ...
We present new near infrared spectroscopic measurements for 29 luminous high-z quasars and use the data to discuss the size and other properties of the NLRs in those sources. The high resolution...
The Properties and the Evolution of the Highly Ionized Gas in MR2251-178 (2003)
Kaspi, S., Netzer, H., Chelouche, D., George, I. M., Turner, T. J., Nandra, K.
We present the first XMM-Newton observations of the radio-quiet quasar MR2251-178. We model the X-ray spectrum with two power laws, one at high energies with a slope of \Gamma=1.6 and the other to...
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...
ISO spectroscopy of star formation and active nuclei in the luminous infrared galaxy NGC 6240 (2003)
Lutz, D., Sturm, E., Genzel, R., Spoon, H. W. W., Moorwood, A. F. M., Netzer, H., ...
We present Infrared Space Observatory mid- and far-infrared spectroscopy of the merging galaxy NGC 6240, an object presenting many aspects of importance for the role of star formation and AGN...
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...
Complex Optical-X-ray Correlations in the Narrow-Line Seyfert 1 Galaxy NGC 4051 (2003)
Shemmer, O., Uttley, P., Netzer, H., McHardy, I. M.
This paper presents the results of a dense and intensive X-ray and optical monitoring of the narrow-line Seyfert 1 galaxy NGC 4051 carried out in 2000. Results of the optical analysis are consistent...
Emission line widths and QSO black hole mass estimates from the 2dF QSO Redshift Survey (2003)
Corbett, E. A., Croom, S. M., Boyle, B. J., Netzer, H., Miller, L., Outram, P. J., ...
We have used composite spectra generated from more than 22000 QSOs observed in the course of the 2dF and 6dF QSO Redshift Surveys to investigate the relationship between the velocity width of...
ISO spectroscopy of star formation and active nuclei in the luminous infrared galaxy NGC 6240 (2003)
Lutz, D., Sturm, E., Genzel, R., Spoon, H. W. W., Moorwood, A. F. M., Netzer, H., ...
Lutz, D., Maiolino, R., Moorwood, A. F. M., Netzer, H., Wagner, S. J., Sturm, E., ...
The state of the matter that is obscuring a small circumnuclear region in AGN can be probed by observations of its broad emission lines. Infrared lines are particularly useful since they penetrate...
The correlation of line strength with luminosity and redshift from composite QSO spectra (2002)
Croom, S. M., Rhook, K., Corbett, E. A., Boyle, B. J., Netzer, H., Loaring, N. S., ...
We have generated a series of composite QSO spectra using over 22000 individual low resolution (~8A) QSO spectra obtained from the 2dF (18.25
Mid-Infrared line diagnostics of Active Galaxies -- A spectroscopic AGN survey with ISO-SWS (2002)
Sturm, E., Lutz, D., Verma, A., Netzer, H., Sternberg, A., Moorwood, A. F. M., ...
We present medium resolution (R approx. 1500) ISO-SWS 2.4--45 micron spectra of a sample of 29 galaxies with active nuclei. This data set is rich in fine structure emission lines tracing the narrow...
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...
Lutz, D., Maiolino, R., Moorwood, A. F. M., Netzer, H., Wagner, S. J., Sturm, E., ...
The state of the matter that is obscuring a small circumnuclear region in active galactic nuclei can be probed by observations of its broad emission lines. Infrared lines are particularly useful...
Mid-infrared line diagnostics of active galaxies - A spectroscopic AGN survey with ISO-SWS (2002)
Sturm, E., Lutz, D., Verma, A., Netzer, H., Sternberg, A., Moorwood, A. F. M., ...
We present medium resolution (R similar to 1500) ISO-SWS 2.4-45 mum spectra of a sample of 29 galaxies with active nuclei. This data set is rich in fine structure emission lines tracing the narrow...
E. Sturm, D. Lutz, A. Verma, H. Netzer, A. Sternberg, ...
Mid-Infrared line diagnostics of active galaxies A spectroscopic AGN survey with ISO-SWS ⋆
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...
Shemmer, O., Romano, P., Bertram, R., Brinkmann, W., Collier, S., Crowley, K. A., ...
We present the results of a 2 yr long optical monitoring program of the narrow-line Seyfert 1 galaxy Ark 564. The majority of this monitoring project was also covered by X-ray observations (RXT E),...
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...
Shemmer, O., Romano, P., Bertram, R., Brinkmann, W., Collier, S., Crowley, K. A., ...
We present the results of a two-year long optical monitoring program of the narrow-line Seyfert 1 galaxy Akn 564. The majority of this monitoring project was also covered by X-ray observations (RXTE)...
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...
The X-ray Emission from the Nucleus of the Dwarf Elliptical Galaxy NGC 3226 (2001)
George, I. M., Mushotzky, R. F., Yaqoob, T., Turner, T. J., Kraemer, S., Ptak, A. F., ...
We present the first high resolution X-ray image of the dwarf elliptical galaxy NGC 3226. The data were obtained during an observation of the nearby Seyfert Galaxy NGC 3227 using the Chandra X-ray...
A Chandra Study of the Circinus Galaxy Point-Source Population (2001)
Bauer, F. E., Brandt, W. N., Sambruna, R. M., Chartas, G., Garmire, G. P., Kaspi, S., ...
We have used the Chandra X-ray Observatory to resolve spatially and spectrally the X-ray emission from the Circinus Galaxy. We report here on the nature of the X-ray emission from the off-nuclear...
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....
X-ray imaging of the Seyfert 2 galaxy Circinus with Chandra (2000)
Sambruna, R. M., Brandt, W. N., Chartas, G., Netzer, H., Kaspi, S., Garmire, G. P., ...
We present results from the zeroth-order imaging of a Chandra HETGS observation of the nearby Seyfert 2 galaxy Circinus. Twelve X-ray sources were detected in the ACIS-S image of the galaxy, embedded...
High-resolution X-ray spectroscopy of the Seyfert 2 galaxy Circinus with Chandra (2000)
Sambruna, R. M., Netzer, H., Kaspi, S., Brandt, W. N., Chartas, G., Garmire, G. P., ...
Results from a 60 ks Chandra HETGS observation of the nearby Seyfert 2 Circinus are presented. The spectrum shows a wealth of emission lines at both soft and hard X-rays, including lines of Ne, Mg,...
ISO-SWS spectroscopy of NGC 1068 (2000)
Lutz, D., Sturm, E., Genzel, R., Moorwood, A. F. M., Alexander, T., Netzer, H., ...
We present ISO-SWS spectroscopy of NGC 1068 for the wavelength range 2.4 to 45um, detecting a total of 36 emission lines. Most of the observed transitions are fine structure and recombination lines...
X-ray Observations of Optically-Selected, Radio-Quiet Quasars I: The ASCA results (1999)
George, I. M., Turner, T. J., Yaqoob, T., Netzer, H., Laor, A., Mushotzky, R. F., ...
We present the result of 27 ASCA observations of 26 radio-quiet quasars (RQQs) from the PG survey. All the RQQs were detected except 2 BALQSOs. We find the variability characteristics of the sources...
A search for broad infrared recombination lines in NGC 1068 (1999)
Lutz, D., Genzel, R., Sturm, E., Tacconi, L., Wieprecht, E., Alexander, T., ...
We report infrared spectroscopy of the prototypical Seyfert 2 galaxy NGC 1068, aiming at detection of broad components of hydrogen recombination lines that originate in the obscured broad-line...
O'Brien, P. T., 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...
Infrared spectroscopy of NGC 4151: ISO observations and NLR line profiles (1998)
Sturm, E., Alexander, T., Lutz, D., Sternberg, A., Netzer, H., Genzel, R.
We present ISO-SWS and ISOPHOT-S spectroscopy of the Seyfert galaxy NGC 4151. We detect a total of 17 fine structure emission lines emitted by a wide range of low- and high-excitation ions, two...
The X-ray Spectral Variability of the Seyfert Galaxy NGC 3227 (1998)
George, I. M., Mushotzky, R. F., Turner, T. J., Yaqoob, T., Ptak, A., Nandra, K., ...
(Abridged) We present the results from {\it ASCA} observations of NGC 3227 along with those from a {\it ROSAT} observation. The 0.6--10 keV continuum is consistent with a powerlaw with $\Gamma \sim...
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...
Collier, S.J., Horne, Keith, Kaspi, S., Netzer, H., Peterson, B.M., Wanders, I., ...
We present results of an intensive 2 month campaign of ground-based spectrophotometric monitoring of the Seyfert 1 galaxy NGC 7469, with a temporal resolution [approximately less than]1 day. The...
The Soft X-ray Spectrum of Scattering--Dominated AGN (1998)
Netzer, H., Turner, T. J., George, I. M.
This paper discusses the properties of scattering--dominated active galactic nuclei (AGN). We define these to be AGN for which the direct line-of-sight to the continuum source is obscured by...
ASCA Observations of the Ionized Gas in the Seyfert Galaxy NGC 3783 (1998)
George, I. M., Turner, T. J., Mushotzky, R. F., Nandra, K., Netzer, H.
We present the results from ASCA observations of NGC 3783 carried out during 1993 and 1996. Variability is observed both between the two epochs and within the individual observations, the latter due...
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...
Evidence for Absorption due to Highly-Ionized Gas in the Radio-quiet Quasar PG 1114+445 (1997)
George, I. M., Nandra, K., Laor, A., Turner, T. J., Fiore, F., Netzer, H., ...
We present results on the X-ray spectrum of the quasar PG 1114+445 from an ASCA observation performed in 1996 June, and a ROSAT observation performed 3 years earlier. We show good agreement between...