Ho, Luis C.; Filippenko, Alexei V.; Sargent, Wallace L. W. A Search for "Dwarf Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies. The Astrophysical Journal Supplement Series. October 1997, 112 (2): 315–390. Bibcode:1997ApJS..112..315H. S2CID 17086638. arXiv:astro-ph/9704107. doi:10.1086/313041.
Maiolino, R.; Salvati, M.; Bassani, L.; Dadina, M.; della Ceca, R.; Matt, G.; Risaliti, G.; Zamorani, G. Heavy obscuration in X-ray weak AGNs. Astronomy and Astrophysics. 1 October 1998, 338: 781–794. Bibcode:1998A&A...338..781M. ISSN 0004-6361. arXiv:astro-ph/9806055.
Guainazzi, M.; Fabian, A. C.; Iwasawa, K.; Matt, G.; Fiore, F. On the transmission-dominated to reprocessing-dominated spectral state transitions in Seyfert 2 galaxies. Monthly Notices of the Royal Astronomical Society. 1 January 2005, 356 (1): 295–308. Bibcode:2005MNRAS.356..295G. arXiv:astro-ph/0409689. doi:10.1111/j.1365-2966.2004.08448.x.
Terashima, Yuichi; Iyomoto, Naoko; Ho, Luis C.; Ptak, Andrew F. X-Ray Properties of LINERs and Low-Luminosity Seyfert Galaxies Observed with ASCA. I. Observations and Results. The Astrophysical Journal Supplement Series. March 2002, 139 (1): 1–36. Bibcode:2002ApJS..139....1T. arXiv:astro-ph/0203005. doi:10.1086/324373.
Awaki, Hisamitsu; Terashima, Yuichi; Higaki, Yuusuke; Fukazawa, Yasushi. Detection of Hard X-Rays from the Compton-Thick Seyfert 2 Galaxy NGC 2273 with Suzaku. Publications of the Astronomical Society of Japan. 30 January 2009, 61 (sp1): S317–S325. Bibcode:2009PASJ...61S.317A. S2CID 12846803. arXiv:0810.4570. doi:10.1093/pasj/61.sp1.S317.
Moran, Edward C.; Barth, Aaron J.; Kay, Laura E.; Filippenko, Alexei V. The Frequency of Polarized Broad Emission Lines in Type 2 Seyfert Galaxies. The Astrophysical Journal. 10 September 2000, 540 (2): L73–L77. Bibcode:2000ApJ...540L..73M. arXiv:astro-ph/0007357. doi:10.1086/312876.
Kuo, C. Y.; Braatz, J. A.; Condon, J. J.; Impellizzeri, C. M. V.; Lo, K. Y.; Zaw, I.; Schenker, M.; Henkel, C.; Reid, M. J.; Greene, J. E. The Megamaser Cosmology Project. III. Accurate Masses of Seven Supermassive Black Holes in Active Galaxies with Circumnuclear Megamaser Disks. The Astrophysical Journal. 20 January 2011, 727 (1): 20. Bibcode:2011ApJ...727...20K. arXiv:1008.2146. doi:10.1088/0004-637X/727/1/20.
Ferruit, Pierre; Wilson, Andrew S.; Mulchaey, John. Hubble Space Telescope WFPC2 Imaging of a Sample of Early-Type Seyfert Galaxies. The Astrophysical Journal Supplement Series. May 2000, 128 (1): 139–169. Bibcode:2000ApJS..128..139F. doi:10.1086/313379.
Ho, Luis C.; Filippenko, Alexei V.; Sargent, Wallace L. W. A Search for "Dwarf Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies. The Astrophysical Journal Supplement Series. October 1997, 112 (2): 315–390. Bibcode:1997ApJS..112..315H. S2CID 17086638. arXiv:astro-ph/9704107. doi:10.1086/313041.
Zhang, J. S.; Henkel, C.; Kadler, M.; Greenhill, L. J.; Nagar, N.; Wilson, A. S.; Braatz, J. A. Extragalactic H2O masers and X-ray absorbing column densities. Astronomy & Astrophysics. 19 April 2006, 450 (3): 933–944. Bibcode:2006A&A...450..933Z. doi:10.1051/0004-6361:20054138.
Guainazzi, M.; Fabian, A. C.; Iwasawa, K.; Matt, G.; Fiore, F. On the transmission-dominated to reprocessing-dominated spectral state transitions in Seyfert 2 galaxies. Monthly Notices of the Royal Astronomical Society. 1 January 2005, 356 (1): 295–308. Bibcode:2005MNRAS.356..295G. arXiv:astro-ph/0409689. doi:10.1111/j.1365-2966.2004.08448.x.
Terashima, Yuichi; Iyomoto, Naoko; Ho, Luis C.; Ptak, Andrew F. X-Ray Properties of LINERs and Low-Luminosity Seyfert Galaxies Observed with ASCA. I. Observations and Results. The Astrophysical Journal Supplement Series. March 2002, 139 (1): 1–36. Bibcode:2002ApJS..139....1T. arXiv:astro-ph/0203005. doi:10.1086/324373.
Awaki, Hisamitsu; Terashima, Yuichi; Higaki, Yuusuke; Fukazawa, Yasushi. Detection of Hard X-Rays from the Compton-Thick Seyfert 2 Galaxy NGC 2273 with Suzaku. Publications of the Astronomical Society of Japan. 30 January 2009, 61 (sp1): S317–S325. Bibcode:2009PASJ...61S.317A. S2CID 12846803. arXiv:0810.4570. doi:10.1093/pasj/61.sp1.S317.
Moran, Edward C.; Barth, Aaron J.; Kay, Laura E.; Filippenko, Alexei V. The Frequency of Polarized Broad Emission Lines in Type 2 Seyfert Galaxies. The Astrophysical Journal. 10 September 2000, 540 (2): L73–L77. Bibcode:2000ApJ...540L..73M. arXiv:astro-ph/0007357. doi:10.1086/312876.
Ulvestad, J. S.; Wilson, A. S. Radio structures of Seyfert galaxies. VI - VLA observations of a nearby sample. The Astrophysical Journal. October 1984, 285: 439. Bibcode:1984ApJ...285..439U. doi:10.1086/162520.
Kuo, C. Y.; Braatz, J. A.; Condon, J. J.; Impellizzeri, C. M. V.; Lo, K. Y.; Zaw, I.; Schenker, M.; Henkel, C.; Reid, M. J.; Greene, J. E. The Megamaser Cosmology Project. III. Accurate Masses of Seven Supermassive Black Holes in Active Galaxies with Circumnuclear Megamaser Disks. The Astrophysical Journal. 20 January 2011, 727 (1): 20. Bibcode:2011ApJ...727...20K. arXiv:1008.2146. doi:10.1088/0004-637X/727/1/20.
Ferruit, Pierre; Wilson, Andrew S.; Mulchaey, John. Hubble Space Telescope WFPC2 Imaging of a Sample of Early-Type Seyfert Galaxies. The Astrophysical Journal Supplement Series. May 2000, 128 (1): 139–169. Bibcode:2000ApJS..128..139F. doi:10.1086/313379.
Yankulova, I. M. The circumnuclear gas and dust environment of the ringed Seyfert 2 galaxy MKN 620. Astronomy and Astrophysics. 1 April 1999, 344: 36–42. Bibcode:1999A&A...344...36Y. ISSN 0004-6361.
Ho, Luis C.; Filippenko, Alexei V.; Sargent, Wallace L. W. A Search for "Dwarf Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies. The Astrophysical Journal Supplement Series. October 1997, 112 (2): 315–390. Bibcode:1997ApJS..112..315H. S2CID 17086638. arXiv:astro-ph/9704107. doi:10.1086/313041.
Zhang, J. S.; Henkel, C.; Kadler, M.; Greenhill, L. J.; Nagar, N.; Wilson, A. S.; Braatz, J. A. Extragalactic H2O masers and X-ray absorbing column densities. Astronomy & Astrophysics. 19 April 2006, 450 (3): 933–944. Bibcode:2006A&A...450..933Z. doi:10.1051/0004-6361:20054138.
Maiolino, R.; Salvati, M.; Bassani, L.; Dadina, M.; della Ceca, R.; Matt, G.; Risaliti, G.; Zamorani, G. Heavy obscuration in X-ray weak AGNs. Astronomy and Astrophysics. 1 October 1998, 338: 781–794. Bibcode:1998A&A...338..781M. ISSN 0004-6361. arXiv:astro-ph/9806055.
Guainazzi, M.; Fabian, A. C.; Iwasawa, K.; Matt, G.; Fiore, F. On the transmission-dominated to reprocessing-dominated spectral state transitions in Seyfert 2 galaxies. Monthly Notices of the Royal Astronomical Society. 1 January 2005, 356 (1): 295–308. Bibcode:2005MNRAS.356..295G. arXiv:astro-ph/0409689. doi:10.1111/j.1365-2966.2004.08448.x.
Terashima, Yuichi; Iyomoto, Naoko; Ho, Luis C.; Ptak, Andrew F. X-Ray Properties of LINERs and Low-Luminosity Seyfert Galaxies Observed with ASCA. I. Observations and Results. The Astrophysical Journal Supplement Series. March 2002, 139 (1): 1–36. Bibcode:2002ApJS..139....1T. arXiv:astro-ph/0203005. doi:10.1086/324373.
Awaki, Hisamitsu; Terashima, Yuichi; Higaki, Yuusuke; Fukazawa, Yasushi. Detection of Hard X-Rays from the Compton-Thick Seyfert 2 Galaxy NGC 2273 with Suzaku. Publications of the Astronomical Society of Japan. 30 January 2009, 61 (sp1): S317–S325. Bibcode:2009PASJ...61S.317A. S2CID 12846803. arXiv:0810.4570. doi:10.1093/pasj/61.sp1.S317.
Moran, Edward C.; Barth, Aaron J.; Kay, Laura E.; Filippenko, Alexei V. The Frequency of Polarized Broad Emission Lines in Type 2 Seyfert Galaxies. The Astrophysical Journal. 10 September 2000, 540 (2): L73–L77. Bibcode:2000ApJ...540L..73M. arXiv:astro-ph/0007357. doi:10.1086/312876.
Ulvestad, J. S.; Wilson, A. S. Radio structures of Seyfert galaxies. VI - VLA observations of a nearby sample. The Astrophysical Journal. October 1984, 285: 439. Bibcode:1984ApJ...285..439U. doi:10.1086/162520.
Kuo, C. Y.; Braatz, J. A.; Condon, J. J.; Impellizzeri, C. M. V.; Lo, K. Y.; Zaw, I.; Schenker, M.; Henkel, C.; Reid, M. J.; Greene, J. E. The Megamaser Cosmology Project. III. Accurate Masses of Seven Supermassive Black Holes in Active Galaxies with Circumnuclear Megamaser Disks. The Astrophysical Journal. 20 January 2011, 727 (1): 20. Bibcode:2011ApJ...727...20K. arXiv:1008.2146. doi:10.1088/0004-637X/727/1/20.
de Vaucouleurs, G.; de Vaucouleurs, A.; Corwin, J. R. Second reference catalogue of bright galaxies. Second Reference Catalogue of Bright Galaxies. 1976, 1976. Bibcode:1976RC2...C......0D.
Ho, Luis C.; Filippenko, Alexei V.; Sargent, Wallace L. W. A Search for "Dwarf Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies. The Astrophysical Journal Supplement Series. October 1997, 112 (2): 315–390. Bibcode:1997ApJS..112..315H. S2CID 17086638. arXiv:astro-ph/9704107. doi:10.1086/313041.
Awaki, Hisamitsu; Terashima, Yuichi; Higaki, Yuusuke; Fukazawa, Yasushi. Detection of Hard X-Rays from the Compton-Thick Seyfert 2 Galaxy NGC 2273 with Suzaku. Publications of the Astronomical Society of Japan. 30 January 2009, 61 (sp1): S317–S325. Bibcode:2009PASJ...61S.317A. S2CID 12846803. arXiv:0810.4570. doi:10.1093/pasj/61.sp1.S317.
Yankulova, I. M. The circumnuclear gas and dust environment of the ringed Seyfert 2 galaxy MKN 620. Astronomy and Astrophysics. 1 April 1999, 344: 36–42. Bibcode:1999A&A...344...36Y. ISSN 0004-6361.
Maiolino, R.; Salvati, M.; Bassani, L.; Dadina, M.; della Ceca, R.; Matt, G.; Risaliti, G.; Zamorani, G. Heavy obscuration in X-ray weak AGNs. Astronomy and Astrophysics. 1 October 1998, 338: 781–794. Bibcode:1998A&A...338..781M. ISSN 0004-6361. arXiv:astro-ph/9806055.