2022ApJS..258...21W

Query : 2022ApJS..258...21W

2022ApJS..258...21W - Astrophys. J., Suppl. Ser., 258, 21-21 (2022/January-0)

Mid-infrared outbursts in nearby galaxies (MIRONG). II. Optical spectroscopic follow-up.

WANG Y., JIANG N., WANG T., YAN L., SHENG Z., DOU L., DING J., CAI Z., SUN L., YANG C. and SHU X.

Abstract (from CDS):

Infrared echo has proven to be an effective means to discover transient accretion events of supermassive black holes (SMBHs), such as tidal disruption events (TDEs) and changing-look active galactic nuclei (AGNs), in dusty circumnuclear environments. To explore the dusty populations of SMBH transient events, we have constructed a large sample of mid-infrared outbursts in nearby galaxies (MIRONG) and performed multiwavelength observations. Here we present the results of multiepoch spectroscopic follow-up observations of a subsample of 54 objects spanning a timescale of 4 yr. Emission-line variability was detected in 22 of them with either emergence or enhancement of broad Balmer emission lines in comparison with pre-outburst spectra. Coronal lines, He IIλ4686, and Bowen line N IIIλ4640 appeared in the spectra of nine, seven, and two sources, respectively. These results suggest that MIRONG is a mixed bag of different transient sources. We have tentatively classified them into different subclass according to their spectral evolution and light curves. Two sources have been in a steady high broad Hα flux up to the latest observation and might be turn-on AGNs. Broad lines faded out in the remaining sources, indicating a transient ionizing source ignited by TDE or sporadic gas accretion. Thirty-one sources do not show noticeable spectral change with respect to their pre-outburst spectra. They have a statistically redder MIR color and lower MIR luminosity of the outbursts, which are consistent with heavily obscured events.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Active galaxies - Active galactic nuclei

Simbad objects: 62

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Number of rows : 62
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 SDSS J010320.42+140149.8 G 01 03 20.42335 +14 01 49.8338           ~ 9 0
2 MCG-02-04-026 Sy2 01 20 48.0204959808 -08 29 18.348202392   16   14.83   ~ 17 0
3 2MASX J02055215+0004121 EmG 02 05 52.1557987296 +00 04 11.767613664           ~ 12 0
4 SN 2006jd SN* 08 02 07.43 +00 48 31.5   22.5 21.8 20.4 21.3 SNIIn 128 1
5 LEDA 1766722 G 08 14 03.7842839568 +26 11 44.321757360           ~ 7 0
6 MCG+08-16-015 G 08 35 36.4917407568 +49 35 42.689825160   16       ~ 13 0
7 SDSS J085959.47+092225.7 G 08 59 59.4677950056 +09 22 25.718528712           ~ 8 0
8 SDSS J090924.55+192004.8 G 09 09 24.5525142264 +19 20 04.813832076           ~ 6 0
9 SN 2005ip SN* 09 32 06.42 +08 26 44.4 18.1 18.7 18.5     SNIIn 230 1
10 SN 2010jl SN* 09 42 53.33 +09 29 41.8           SNIIn 350 1
11 SDSS J094303.26+595809.3 G 09 43 03.2694237120 +59 58 09.269266332           ~ 5 0
12 NGC 2981 G 09 44 56.5708289640 +31 05 52.308665952   15.0       ~ 30 0
13 2dFGRS TGN421Z182 LIN 10 03 50.9808851328 +02 02 27.684695040   18.668   17.353   ~ 10 0
14 SDSS J103753.68+391249.6 G 10 37 53.6935026384 +39 12 49.727770632           ~ 7 0
15 SDSS J104306.56+271602.1 G 10 43 06.5630358336 +27 16 02.088339024           ~ 6 0
16 SDSS J105801.52+544437.0 G 10 58 01.5248587248 +54 44 36.969467028           ~ 7 0
17 Z 291-26 Sy1 11 05 01.9839395400 +59 41 03.510632904   15.07 14.67     ~ 50 0
18 Z 185-14 LIN 11 09 58.3454163288 +37 08 09.647174400   15.5       ~ 20 0
19 SDSS J111122.44+592334.3 G 11 11 22.4467733856 +59 23 34.332577332           ~ 4 0
20 SDSS J111536.57+054449.7 QSO 11 15 36.5674817952 +05 44 49.690796568           ~ 23 0
21 2MASX J11201828+1933458 G 11 20 18.3117778032 +19 33 45.903253752           ~ 7 0
22 SDSS J112446.21+045525.4 G 11 24 46.2139002600 +04 55 25.494127320           ~ 6 0
23 MCG+09-19-087 AGN 11 29 16.1380137168 +51 31 23.584632888   16       ~ 39 0
24 2MASX J11335602+6701073 Sy1 11 33 55.9428441072 +67 01 07.065822252   15.63 15.01     ~ 26 0
25 2MASX J11390131+6134089 G 11 39 01.2928652376 +61 34 08.583148128           ~ 8 0
26 SDSS J120338.31+585911.8 G 12 03 38.3538506088 +58 59 11.285233246           ~ 8 0
27 SDSS J121907.89+051645.7 G 12 19 07.8900120840 +05 16 45.711577344           ~ 6 0
28 SDSS J123852.87+081512.0 Sy2 12 38 52.8718111656 +08 15 11.874289104           ~ 6 0
29 SDSS J124521.42-014735.5 G 12 45 21.4188625176 -01 47 35.588104260   18.890   17.549   ~ 8 0
30 SDSS J130532.91+395337.9 G 13 05 32.9099375376 +39 53 37.959295740           ~ 5 0
31 LEDA 1268872 G 13 08 15.5758724712 +04 29 09.513588768           ~ 10 0
32 LEDA 1322378 G 13 15 09.3404552568 +07 27 37.688749236           ~ 7 0
33 2MASX J13225989+3301214 LIN 13 22 59.9330574000 +33 01 21.783450216   18.106       ~ 6 0
34 LEDA 1691799 G 13 29 02.0481300768 +23 41 08.421710136           ~ 8 0
35 2MASX J13321263+2036381 G 13 32 12.6314196240 +20 36 37.955966760           ~ 8 0
36 SN 2015da SN* 13 52 24.16470 +39 41 27.9355           SNIIn 41 0
37 2MASX J14022128+3922122 LIN 14 02 21.26400 +39 22 12.5328           ~ 10 0
38 FIRST J140648.4+062834 rG 14 06 48.4258233936 +06 28 34.866664824           ~ 8 0
39 LEDA 2178033 G 14 12 35.8894907856 +41 14 58.484413608           ~ 7 0
40 LEDA 3086995 G 14 42 27.5974028352 +55 58 46.392851136           ~ 12 0
41 SDSS J150844.22+260249.1 G 15 08 44.2175014872 +26 02 49.108054740           ~ 5 0
42 LEDA 1827995 BiC 15 12 57.1885321944 +28 09 37.458585432           ~ 8 0
43 2MASX J15134575+3111250 G 15 13 45.7686097272 +31 11 24.982228824           ~ 10 0
44 2MASS J15371130+5814201 Sy2 15 37 11.2988854248 +58 14 20.255736444   18.57 17.91     ~ 14 0
45 SDSS J154955.19+332752.0 G 15 49 55.2021273312 +33 27 52.012428192           ~ 9 0
46 2MASX J15543720+5255265 Sy2 15 54 37.2626214336 +52 55 26.424427764   18.66 18.01     ~ 7 0
47 LEDA 1647892 G 15 55 39.9502687800 +21 20 05.818839756           ~ 7 0
48 2MASX J15574349+2727530 LIN 15 57 43.5257001696 +27 27 52.888457304   15.72       ~ 40 0
49 2MASX J16005227+4612427 BiC 16 00 52.2692858544 +46 12 42.915405132           ~ 6 0
50 SN 2018cow SN* 16 16 00.254 +22 16 05.10           SNIb 305 0
51 LEDA 1700288 G 16 20 34.9939234728 +24 07 26.512500684           ~ 11 0
52 SDSS J162810.03+481047.7 G 16 28 10.0489034064 +48 10 47.690255280           ~ 7 0
53 LEDA 2240516 G 16 32 46.8458564688 +44 16 18.583041108           ~ 6 0
54 SDSS J164754.38+384342.0 G 16 47 54.3801334848 +38 43 42.057818184           ~ 9 0
55 SDSS J165726.81+234528.1 Sy2 16 57 26.8116465504 +23 45 28.128181176           ~ 12 0
56 Z 110-20 Sy2 16 59 22.6538254680 +20 49 47.429677308   15.70       ~ 44 0
57 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
58 NAME G2 Dust Cloud IR 17 45 40.04 -29 00 28.1           ~ 209 0
59 NAME Sgr A*-f Cld 17 45 40.04 -29 00 28.1           ~ 59 1
60 SDSS J214603.88+104128.6 G 21 46 03.885 +10 41 28.65           ~ 5 0
61 SDSS J220349.23+112433.0 G 22 03 49.2342634560 +11 24 33.057824076           ~ 3 0
62 LEDA 1126253 G 22 15 41.6065502328 -01 07 21.068965020   16.10   14.83   ~ 12 0

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