New active galactic nuclei detected in ROSAT All Sky Survey galaxies - The complete dataset (2008)
Kollatschny, W., Kotulla, R., Pietsch, W., Bischoff, K., Zetzl, M.
The ROSAT ALL Sky Survey Bright Source Catalogue (RASS-BSC) has been correlated with the Catalogue of Principal Galaxies (PGC) to identify new extragalactic counterparts. 550 reliable optical...
The optical emission line spectrum of Mark 110 (2007)
Veron, P., Joly, M., Kollatschny, W.
We analyse in detail the rich emission line spectrum of Mark 110 to determine the physical conditions in the nucleus of this object, a peculiar NLS1 without any detectable Fe II emission associated...
The Sloan Digital Sky Survey-II Supernova Survey: Technical Summary (2007)
Frieman, Joshua A., Bassett, B., Becker, A., Choi, C., Cinabro, D., DeJongh, F., ...
The Sloan Digital Sky Survey-II (SDSS-II) has embarked on a multi-year project to identify and measure light curves for intermediate-redshift (0.05 < z < 0.35) Type Ia supernovae (SNe Ia) using...
XMM-Newton observation of Mrk 110 (2006)
Boller, Th., Balestra, I., Kollatschny, W.
We report on the first XMM-Newton observation of the bright Narrow-Line Seyfert 1 galaxy Mrk 110. We find a narrow Fe K fluorescent line, a broad component FWHM ~ 16500 km/s of the OVII triplet,...
Long and Short Term Variability in the Seyfert Galaxy Mrk 110 (2006)
Long and Short Term Variability in the Seyfert Galaxy Mrk 110
Probing unexplored territories with MUSE: a second generation instrument for the VLT (2006)
Bacon, R., Bauer, S., Boehm, P., Boudon, D., Brau-Nogue, S., Caillier, P., ...
The Multi Unit Spectroscopic Explorer (MUSE) is a second-generation VLT panoramic integral-field spectrograph under preliminary design study. MUSE has a field of 1x1 arcmin**2 sampled at 0.2x0.2...
Spectral line variability amplitudes in AGNs (2006)
Kollatschny, W., Zetzl, M., Dietrich, M.
We present the results of a long-term variability campaign of very broad-line AGNs with line widths broader than FWHM $>$ 5000 kms$^{-1}$. The main goal of our investigation was to study whether the...
Spin orientation of supermassive black holes in active galaxies (2003)
Accretion of gas onto a central supermassive black hole is generally accepted to be the source of the emitted energy in active galactic nuclei.The broad emission lines we observe in their optical...
Detailed line profile variability studies of the narrow line Seyfert 1 galaxy Mrk110 are presented. We obtained the spectra in a variability campaign carried out with the 9.2m Hobby-Eberly Telescope...
Geometry and Kinematics in the Central Broad-Line Region of a Seyfert 1 Galaxy (2002)
We recorded spectra of the highly variable Seyfert 1 galaxy Mrk110 in a variability campaign with the 9.2m Hobby-Eberly Telescope at McDonald Observatory in order to study the detailed line profile...
RevMexAA (Serie de Conferencias), 10, 79-82 (2001) (2001)
We briey review results of a long{term variability campaign on the Seyfert 1 galaxy Markarian 110. Furthermore, we present new results based on data taken between November 1999 and April 2000 with...
RevMexAA (Serie de Conferencias), 10, 79--82 (2001) (2001)
We briefly review results of a long--term variability campaign on the Seyfert 1 galaxy Markarian 110. Furthermore, we present new results based on data taken between November 1999 and April 2000 with...
Short-term emission line and continuum variations in Mrk 110 (2001)
W. Kollatschny, K. Bischo, E. L. Robinson, W. F. Welsh
We present results of a variability campaign of Mrk 110 performed with the 9.2-m Hobby-Eberly Telescope (HET) at McDonald Observatory. The high S/N spectra cover most of the optical range. They were...
Short-term emission line and continuum variations in Mrk110 (2001)
Kollatschny, W., Bischoff, K., Robinson, E. L., Welsh, W. F., Hill, G. J.
We present results of a variability campaign of Mrk110 performed with the 9.2-m Hobby-Eberly Telescope (HET) at McDonald Observatory. The high S/N spectra cover most of the optical range. They were...
Long and short term variability in the seyfert galaxy mrk 110 (2001)
Kollatschny , W., Welsh , W. F.
We brie y review results of a long{term variability campaign on the Seyfert 1 galaxy Markarian 110. Furthermore, we present new results based on data taken between November 1999 and April 2000 with...
Strong optical line variability in Mkn 110 (1999)
We present results of a long-term variability campaign on the Seyfert 1 galaxy Markarian 110. Mkn 110 is a narrow-line Seyfert 1 object hosted in a morphological peculiar galaxy. We monitored the...
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...
Profile variations in AGN spectra (1998)
We present results of optical long-term variability campaigns (10 - 20 years) of the two Seyfert galaxies NGC 7603 and Mrk 110. The variations of the continuum, of the individual broad line...
Properties of new X-ray selected AGN (1998)
Bischoff, K., Pietsch, W., Boller, T., Döbereiner, S., Kollatschny, W.
We present the results of a program to identify so far unknown active nuclei (AGN) in galaxies. Candidate galactic nuclei have been selected for optical spectroscopy from a cross-correlation of the...
Peterson, B. M., Barth, A. J., Berlind, P., Bertram, R., Bischoff, K., Bochkarev, N. G., ...
We present the results of three years of ground-based observations of the Seyfert 1 galaxy NGC 5548, which combined with previously reported data, yield optical continuum and broad-line H-beta light...
Pietsch, W., Boller, Th., Doebereiner, S., Bischoff, K., Kollatschny, W.
We present the first results of a program to identify so far unknown active nuclei (AGN) in galaxies. Candidate galactic nuclei have been selected for optical spectroscopy from a cross-correlation of...
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...
Monitoring of active galactic nuclei .6. The quasar mkn-876 (1995)
Erkens, U, Wagner, S J, Alloin, D, Axon, D, Debruyn, A G, Clavel, J, ...