2020MNRAS.493.5773Y


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST02:58:38

2020MNRAS.493.5773Y - Mon. Not. R. Astron. Soc., 493, 5773-5787 (2020/April-3)

Spectral variability of a sample of extreme variability quasars and implications for the Mg II broad-line region.

YANG Q., SHEN Y., CHEN Y.-C., LIU X., ANNIS J., AVILA S., BERTIN E., BROOKS D., BUCKLEY-GEER E., CARNERO ROSELL A., CARRASCO KIND M., CARRETERO J., DA COSTA L., DESAI S., DIEHL H.T., DOEL P., FRIEMAN J., GARCIA-BELLIDO J., GAZTANAGA E., GERDES D., GRUEN D., GRUENDL R., GSCHWEND J., GUTIERREZ G., HOLLOWOOD D.L., HONSCHEID K., HOYLE B., JAMES D., KRAUSE E., KUEHN K., LIDMAN C., LIMA M., MAIA M., MARSHALL J., MARTINI P., MENANTEAU F., MIQUEL R., PLAZAS MALAGON A., SANCHEZ E., SCARPINE V., SCHINDLER R., SCHUBNELL M., SERRANO S., SEVILLA I., SMITH M., SOARES-SANTOS M., SOBREIRA F., SUCHYTA E., SWANSON M., TARLE G., VIKRAM V. and WALKER A.

Abstract (from CDS):

We present new Gemini/GMOS optical spectroscopy of 16 extreme variability quasars (EVQs) that dimmed by more than 1.5 mag in the g band between the Sloan Digital Sky Survey (SDSS) and the Dark Energy Survey epochs (separated by a few years in the quasar rest frame). These EVQs are selected from quasars in the SDSS Stripe 82 region, covering a redshift range of 0.5 < z < 2.1. Nearly half of these EVQs brightened significantly (by more than 0.5 mag in the g band) in a few years after reaching their previous faintest state, and some EVQs showed rapid (non-blazar) variations of greater than 1-2 mag on time-scales of only months. To increase sample statistics, we use a supplemental sample of 33 EVQs with multi-epoch spectra from SDSS that cover the broad Mg II λ2798 line. Leveraging on the large dynamic range in continuum variability between the multi-epoch spectra, we explore the associated variations in the broad Mg II line, whose variability properties have not been well studied before. The broad Mg II flux varies in the same direction as the continuum flux, albeit with a smaller amplitude, which indicates at least some portion of Mg II is reverberating to continuum changes. However, the full width at half-maximum (FWHM) of Mg II does not vary accordingly as continuum changes for most objects in the sample, in contrast to the case of the broad Balmer lines. Using the width of broad Mg II to estimate the black hole mass with single epoch spectra therefore introduces a luminosity-dependent bias.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): black hole physics - line: profiles - galaxies: active - quasars: general

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 2SLAQ J004826.09-011310.7 QSO 00 48 26.094 -01 13 10.78   20.79 20.42     ~ 14 0
2 [VV2010] J014027.9+005212 QSO 01 40 27.893 +00 52 12.62   20.26 19.78     ~ 15 0
3 2SLAQ J014048.62-003500.9 QSO 01 40 48.629 -00 35 00.90   20.38 20.04     ~ 12 0
4 CD-30 17706 WD* 20 10 56.8485174654 -30 13 06.629141494 11.654 12.286 12.242 12.311 12.381 DA3.1 221 0
5 2SLAQ J214130.61-001649.1 QSO 21 41 30.6161179070 -00 16 49.152319091   20.27 20.02     ~ 15 0
6 [VV2006] J215944.3+000528 QSO 21 59 44.3287 +00 05 27.780   20.32 19.84     ~ 21 0
7 [VV2006] J220908.3-005559 QSO 22 09 08.2474313213 -00 55 58.948851874   18.4 18.89 18.8   ~ 25 0
8 2SLAQ J221312.07-003725.6 QSO 22 13 12.081 -00 37 25.61   20.52 20.26     ~ 12 0
9 3XMM J221739.1+002903 QSO 22 17 39.2364113044 +00 29 04.427706539   20.11 19.79     ~ 14 0
10 [VV2006] J222836.3-003203 QSO 22 28 36.2469426968 -00 32 02.974091699   19.86 19.42     ~ 21 0
11 2SLAQ J224924.01+004750.4 QSO 22 49 24.017 +00 47 50.47   21.06 20.47     ~ 13 0
12 LP 877-23 PM* 22 52 41.0353308036 -20 35 32.995847106   13.02 11.90     ~ 104 0
13 2SLAQ J225250.73+000418.3 QSO 22 52 50.7336936681 +00 04 18.385146679   19.61 19.31     ~ 16 0
14 2SLAQ J232838.04-005313.6 QSO 23 28 38.040 -00 53 13.66   20.12 19.89     ~ 13 0
15 2SLAQ J233517.82-004927.0 QSO 23 35 17.824 -00 49 27.03   20.14 19.95     ~ 13 0
16 2SLAQ J233853.45-010119.4 QSO 23 38 53.449 -01 01 19.44   20.39 19.98     ~ 14 0
17 2SLAQ J234307.38+003854.7 QSO 23 43 07.380 +00 38 54.73   19.82 19.62     ~ 13 0
18 2SLAQ J235040.09+002558.9 QSO 23 50 40.1003440896 +00 25 58.851555007   19.50 19.22     ~ 17 0

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2020.10.24-02:58:38

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