2021ApJ...922..151K

Query : 2021ApJ...922..151K

2021ApJ...922..151K - Astrophys. J., 922, 151-151 (2021/December-1)

AGN STORM 2. I. First results: a change in the weather of Mrk 817.

KARA E., MEHDIPOUR M., KRISS G.A., CACKETT E.M., ARAV N., BARTH A.J., BYUN D., BROTHERTON M.S., DE ROSA G., GELBORD J., HERNANDEZ SANTISTEBAN J.V., HU C., KAASTRA J., LANDT H., LI Y.-R., MILLER J.A., MONTANO J., PARTINGTON E., ACEITUNO J., BAI J.-M., BAO D., BENTZ M.C., BRINK T.G., CHELOUCHE D., CHEN Y.-J., COLMENERO E.R., DALLA BONTA E., DEHGHANIAN M., DU P., EDELSON R., FERLAND G.J., FERRARESE L., FIAN C., FILIPPENKO A.V., FISCHER T., GOAD M.R., GONZALEZ BUITRAGO D.H., GORJIAN V., GRIER C.J., GUO W.-J., HALL P.B., HO L.C., HOMAYOUNI Y., HORNE K., ILIC D., JIANG B.-W., JONER M.D., KASPI S., KOCHANEK C.S., KORISTA K.T., KYNOCH D., LI S.-S., LIU J.-R., CHARDY I.M.M., McLANE J.N., MITCHELL J.A.J., NETZER H., OLSON K.A., POGGE R.W., POPOVIC L.C., PROGA D., STORCHI-BERGMANN T., STRASBURGER E., TREU T., VESTERGAARD M., WANG J.-M., WARD M.J., WATERS T., WILLIAMS P.R., YANG S., YAO Z.-H., ZASTROCKY T.E., ZHAI S. and ZU Y.

Abstract (from CDS):

We present the first results from the ongoing, intensive, multiwavelength monitoring program of the luminous Seyfert 1 galaxy Mrk 817. While this active galactic nucleus was, in part, selected for its historically unobscured nature, we discovered that the X-ray spectrum is highly absorbed, and there are new blueshifted, broad, and narrow UV absorption lines, which suggest that a dust-free, ionized obscurer located at the inner broad-line region partially covers the central source. Despite the obscuration, we measure UV and optical continuum reverberation lags consistent with a centrally illuminated Shakura-Sunyaev thin accretion disk, and measure reverberation lags associated with the optical broad-line region, as expected. However, in the first 55 days of the campaign, when the obscuration was becoming most extreme, we observe a de-coupling of the UV continuum and the UV broad emission-line variability. The correlation recovered in the next 42 days of the campaign, as Mrk 817 entered a less obscured state. The short C IV and Lyα lags suggest that the accretion disk extends beyond the UV broad-line region.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): black hole physics

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Mrk 335 Sy1 00 06 19.5372339024 +20 12 10.617404076   14.19 13.85     ~ 1344 0
2 3C 50 Rad 01 44.4 +51 33           ~ 19 0
3 NGC 985 Sy1 02 34 37.882 -08 47 17.02   14.64 14.28 12.9   ~ 449 0
4 WG 7 WD* 03 09 47.9177537304 -56 23 49.411222764   13.99 14.14 14.42   DB 59 0
5 LEDA 88588 Sy1 07 08 41.4886614696 -49 33 06.308921700   16.02 15.7 12.7   ~ 566 0
6 NGC 3783 Sy1 11 39 01.7096819040 -37 44 19.009642992   12.46 13.43 11.33 12.1 ~ 1765 1
7 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 6022 1
8 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
9 NGC 4593 Sy1 12 39 39.4435107024 -05 20 39.034988448   13.95 13.15     ~ 1179 0
10 LEDA 88835 Sy1 13 25 19.3805530608 -38 24 52.611680340   16.64 13.80 15.33 14.78 ~ 457 0
11 NGC 5548 Sy1 14 17 59.5400291832 +25 08 12.603122268   14.35 13.73     ~ 2895 0
12 Z 296-15 Sy1 14 36 22.0820611632 +58 47 39.394934844   14.19 13.79     ~ 592 0

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