The lick AGN monitoring project 2011: Reverberation mapping of Markarian 50

Aaron J. Barth, Anna Pancoast, Shawn J. Thorman, Vardha N. Bennert, David J. Sand, Weidong Li, Gabriela Canalizo, Alexei V. Filippenko, Elinor L. Gates, Jenny E. Greene, Matthew A. Malkan, Daniel Stern, Tommaso Treu, Jong Hak Woo, Roberto J. Assef, Hyun Jin Bae, Brendon J. Brewer, Tabitha Buehler, S. Bradley Cenko, Kelsey I. ClubbMichael C. Cooper, Aleksandar M. Diamond-Stanic, Kyle D. Hiner, Sebastian F. Hönig, Michael D. Joner, Michael T. Kandrashoff, C. David Laney, Mariana S. Lazarova, A. M. Nierenberg, Dawoo Park, Jeffrey M. Silverman, Donghoon Son, Alessandro Sonnenfeld, Erik J. Tollerud, Jonelle L. Walsh, Richard Walters, Robert L. Da Silva, Michele Fumagalli, Michael D. Gregg, Chelsea E. Harris, Eric Y. Hsiao, Jeffrey Lee, Liliana Lopez, Jacob Rex, Nao Suzuki, Jonathan R. Trump, David Tytler, Gbor Worseck, Hassen M. Yesuf

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

The Lick AGN Monitoring Project 2011 observing campaign was carried out over the course of 11 weeks in spring 2011. Here we present the first results from this program, a measurement of the broad-line reverberation lag in the Seyfert 1 galaxy Mrk50. Combining our data with supplemental observations obtained prior to the start of the main observing campaign, our data set covers a total duration of 4.5 months. During this time, Mrk50 was highly variable, exhibiting a maximum variability amplitude of a factor of 4 in the U-band continuum and a factor of ∼2 in the Hβ line. Using standard cross-correlation techniques, we find that Hβ and Hγ lag the V-band continuum by τcen = 10.64+0.82 - 0.93 and 8.43+1.30 - 1.28days, respectively, while the lag of He II λ4686 is unresolved. The Hβ line exhibits a symmetric velocity-resolved reverberation signature with shorter lags in the high-velocity wings than in the line core, consistent with an origin in a broad-line region (BLR) dominated by orbital motion rather than infall or outflow. Assuming a virial normalization factor of f = 5.25, the virial estimate of the black hole mass is (3.2 ± 0.5) × 107 M . These observations demonstrate that Mrk50 is among the most promising nearby active galaxies for detailed investigations of BLR structure and dynamics.

Original languageEnglish (US)
Article numberL4
JournalAstrophysical Journal Letters
Volume743
Issue number1
DOIs
StatePublished - Dec 10 2011

Fingerprint

reverberation
time lag
H lines
monitoring
outflow
continuums
active galaxies
extremely high frequencies
wings
cross correlation
signatures
galaxies
orbits
project
estimates
normalisation
programme

Keywords

  • galaxies: active
  • galaxies: individual (Mrk 50)
  • galaxies: nuclei

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Barth, A. J., Pancoast, A., Thorman, S. J., Bennert, V. N., Sand, D. J., Li, W., ... Yesuf, H. M. (2011). The lick AGN monitoring project 2011: Reverberation mapping of Markarian 50. Astrophysical Journal Letters, 743(1), [L4]. https://doi.org/10.1088/2041-8205/743/1/L4

The lick AGN monitoring project 2011 : Reverberation mapping of Markarian 50. / Barth, Aaron J.; Pancoast, Anna; Thorman, Shawn J.; Bennert, Vardha N.; Sand, David J.; Li, Weidong; Canalizo, Gabriela; Filippenko, Alexei V.; Gates, Elinor L.; Greene, Jenny E.; Malkan, Matthew A.; Stern, Daniel; Treu, Tommaso; Woo, Jong Hak; Assef, Roberto J.; Bae, Hyun Jin; Brewer, Brendon J.; Buehler, Tabitha; Cenko, S. Bradley; Clubb, Kelsey I.; Cooper, Michael C.; Diamond-Stanic, Aleksandar M.; Hiner, Kyle D.; Hönig, Sebastian F.; Joner, Michael D.; Kandrashoff, Michael T.; Laney, C. David; Lazarova, Mariana S.; Nierenberg, A. M.; Park, Dawoo; Silverman, Jeffrey M.; Son, Donghoon; Sonnenfeld, Alessandro; Tollerud, Erik J.; Walsh, Jonelle L.; Walters, Richard; Da Silva, Robert L.; Fumagalli, Michele; Gregg, Michael D.; Harris, Chelsea E.; Hsiao, Eric Y.; Lee, Jeffrey; Lopez, Liliana; Rex, Jacob; Suzuki, Nao; Trump, Jonathan R.; Tytler, David; Worseck, Gbor; Yesuf, Hassen M.

In: Astrophysical Journal Letters, Vol. 743, No. 1, L4, 10.12.2011.

Research output: Contribution to journalArticle

Barth, AJ, Pancoast, A, Thorman, SJ, Bennert, VN, Sand, DJ, Li, W, Canalizo, G, Filippenko, AV, Gates, EL, Greene, JE, Malkan, MA, Stern, D, Treu, T, Woo, JH, Assef, RJ, Bae, HJ, Brewer, BJ, Buehler, T, Cenko, SB, Clubb, KI, Cooper, MC, Diamond-Stanic, AM, Hiner, KD, Hönig, SF, Joner, MD, Kandrashoff, MT, Laney, CD, Lazarova, MS, Nierenberg, AM, Park, D, Silverman, JM, Son, D, Sonnenfeld, A, Tollerud, EJ, Walsh, JL, Walters, R, Da Silva, RL, Fumagalli, M, Gregg, MD, Harris, CE, Hsiao, EY, Lee, J, Lopez, L, Rex, J, Suzuki, N, Trump, JR, Tytler, D, Worseck, G & Yesuf, HM 2011, 'The lick AGN monitoring project 2011: Reverberation mapping of Markarian 50', Astrophysical Journal Letters, vol. 743, no. 1, L4. https://doi.org/10.1088/2041-8205/743/1/L4
Barth, Aaron J. ; Pancoast, Anna ; Thorman, Shawn J. ; Bennert, Vardha N. ; Sand, David J. ; Li, Weidong ; Canalizo, Gabriela ; Filippenko, Alexei V. ; Gates, Elinor L. ; Greene, Jenny E. ; Malkan, Matthew A. ; Stern, Daniel ; Treu, Tommaso ; Woo, Jong Hak ; Assef, Roberto J. ; Bae, Hyun Jin ; Brewer, Brendon J. ; Buehler, Tabitha ; Cenko, S. Bradley ; Clubb, Kelsey I. ; Cooper, Michael C. ; Diamond-Stanic, Aleksandar M. ; Hiner, Kyle D. ; Hönig, Sebastian F. ; Joner, Michael D. ; Kandrashoff, Michael T. ; Laney, C. David ; Lazarova, Mariana S. ; Nierenberg, A. M. ; Park, Dawoo ; Silverman, Jeffrey M. ; Son, Donghoon ; Sonnenfeld, Alessandro ; Tollerud, Erik J. ; Walsh, Jonelle L. ; Walters, Richard ; Da Silva, Robert L. ; Fumagalli, Michele ; Gregg, Michael D. ; Harris, Chelsea E. ; Hsiao, Eric Y. ; Lee, Jeffrey ; Lopez, Liliana ; Rex, Jacob ; Suzuki, Nao ; Trump, Jonathan R. ; Tytler, David ; Worseck, Gbor ; Yesuf, Hassen M. / The lick AGN monitoring project 2011 : Reverberation mapping of Markarian 50. In: Astrophysical Journal Letters. 2011 ; Vol. 743, No. 1.
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abstract = "The Lick AGN Monitoring Project 2011 observing campaign was carried out over the course of 11 weeks in spring 2011. Here we present the first results from this program, a measurement of the broad-line reverberation lag in the Seyfert 1 galaxy Mrk50. Combining our data with supplemental observations obtained prior to the start of the main observing campaign, our data set covers a total duration of 4.5 months. During this time, Mrk50 was highly variable, exhibiting a maximum variability amplitude of a factor of 4 in the U-band continuum and a factor of ∼2 in the Hβ line. Using standard cross-correlation techniques, we find that Hβ and Hγ lag the V-band continuum by τcen = 10.64+0.82 - 0.93 and 8.43+1.30 - 1.28days, respectively, while the lag of He II λ4686 is unresolved. The Hβ line exhibits a symmetric velocity-resolved reverberation signature with shorter lags in the high-velocity wings than in the line core, consistent with an origin in a broad-line region (BLR) dominated by orbital motion rather than infall or outflow. Assuming a virial normalization factor of f = 5.25, the virial estimate of the black hole mass is (3.2 ± 0.5) × 107 M ⊙. These observations demonstrate that Mrk50 is among the most promising nearby active galaxies for detailed investigations of BLR structure and dynamics.",
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AU - Barth, Aaron J.

AU - Pancoast, Anna

AU - Thorman, Shawn J.

AU - Bennert, Vardha N.

AU - Sand, David J.

AU - Li, Weidong

AU - Canalizo, Gabriela

AU - Filippenko, Alexei V.

AU - Gates, Elinor L.

AU - Greene, Jenny E.

AU - Malkan, Matthew A.

AU - Stern, Daniel

AU - Treu, Tommaso

AU - Woo, Jong Hak

AU - Assef, Roberto J.

AU - Bae, Hyun Jin

AU - Brewer, Brendon J.

AU - Buehler, Tabitha

AU - Cenko, S. Bradley

AU - Clubb, Kelsey I.

AU - Cooper, Michael C.

AU - Diamond-Stanic, Aleksandar M.

AU - Hiner, Kyle D.

AU - Hönig, Sebastian F.

AU - Joner, Michael D.

AU - Kandrashoff, Michael T.

AU - Laney, C. David

AU - Lazarova, Mariana S.

AU - Nierenberg, A. M.

AU - Park, Dawoo

AU - Silverman, Jeffrey M.

AU - Son, Donghoon

AU - Sonnenfeld, Alessandro

AU - Tollerud, Erik J.

AU - Walsh, Jonelle L.

AU - Walters, Richard

AU - Da Silva, Robert L.

AU - Fumagalli, Michele

AU - Gregg, Michael D.

AU - Harris, Chelsea E.

AU - Hsiao, Eric Y.

AU - Lee, Jeffrey

AU - Lopez, Liliana

AU - Rex, Jacob

AU - Suzuki, Nao

AU - Trump, Jonathan R.

AU - Tytler, David

AU - Worseck, Gbor

AU - Yesuf, Hassen M.

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AB - The Lick AGN Monitoring Project 2011 observing campaign was carried out over the course of 11 weeks in spring 2011. Here we present the first results from this program, a measurement of the broad-line reverberation lag in the Seyfert 1 galaxy Mrk50. Combining our data with supplemental observations obtained prior to the start of the main observing campaign, our data set covers a total duration of 4.5 months. During this time, Mrk50 was highly variable, exhibiting a maximum variability amplitude of a factor of 4 in the U-band continuum and a factor of ∼2 in the Hβ line. Using standard cross-correlation techniques, we find that Hβ and Hγ lag the V-band continuum by τcen = 10.64+0.82 - 0.93 and 8.43+1.30 - 1.28days, respectively, while the lag of He II λ4686 is unresolved. The Hβ line exhibits a symmetric velocity-resolved reverberation signature with shorter lags in the high-velocity wings than in the line core, consistent with an origin in a broad-line region (BLR) dominated by orbital motion rather than infall or outflow. Assuming a virial normalization factor of f = 5.25, the virial estimate of the black hole mass is (3.2 ± 0.5) × 107 M ⊙. These observations demonstrate that Mrk50 is among the most promising nearby active galaxies for detailed investigations of BLR structure and dynamics.

KW - galaxies: active

KW - galaxies: individual (Mrk 50)

KW - galaxies: nuclei

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