2012A&A...541A..77M


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.20CET22:00:25

2012A&A...541A..77M - Astronomy and Astrophysics, volume 541A, 77-77 (2012/5-1)

Unusual quasars from the Sloan Digital Sky Survey selected by means of Kohonen self-organising maps.

MEUSINGER H., SCHALLDACH P., SCHOLZ R.-D., IN DER AU A., NEWHOLM M., DE HOON A. and KAMINSKY B.

Abstract (from CDS):

Large spectroscopic surveys have discovered very peculiar and hitherto unknown types of active galactic nuclei (AGN). Such rare objects may hold clues to the accretion history of the supermassive black holes at the centres of galaxies. We aim to create a sizeable sample of unusual quasars from the unprecedented spectroscopic database of the Sloan Digital Sky Survey (SDSS). We exploit the spectral archive of the SDSS Data Release 7 to select unusual quasar spectra. The selection method is based on a combination of the power of self-organising maps and the visual inspection of a huge number of spectra. Self-organising maps were applied to nearly 105 spectra classified as quasars at redshifts from z=0.6 to 4.3 by the SDSS pipeline. Particular attention was paid to minimise possible contamination by rare peculiar stellar spectral types. All selected quasar spectra were individually studied to determine the object type and the redshift. We present a catalogue of 1005 quasars with unusual spectra. These spectra are dominated by either broad absorption lines (BALs; 42%), unusual red continua (27%), weak emission lines (18%), or conspicuously strong optical and/or UV iron emission (11%). This large sample provides a useful resource for both studying properties and relations of/between different types of unusual quasars and selecting particularly interesting objects, even though the compilation is not aimed at completeness in a quantifiable sense. The spectra are grouped into six types for which composite spectra are constructed and mean properties are computed. Remarkably, all these types turn out to be on average more luminous than comparison samples of normal quasars after a statistical correction is made for intrinsic reddening (E(B-V)≃0 to 0.4 for SMC-like extinction). Both the unusual BAL quasars and the strong iron emitters have significantly lower radio luminosities than normal quasars. We also confirm that strong BALs avoid the most radio-luminous quasars. For 32 particularly interesting objects, individual spectra are presented. Among these objects are quasars with many narrow BAL troughs and one quasar where the continuum is strongly suppressed by overlapping BAL troughs across nearly the whole SDSS spectrum. Finally, we create a sample of quasars similar to the two ``mysterious'' objects discovered by Hall et al. (2002ApJS..141..267H) and briefly discuss the quasar properties and possible explanations of their highly peculiar spectra.

Abstract Copyright:

Journal keyword(s): galaxies: active - quasars: general - quasars: absorption lines - quasars: emission lines - black hole physics

VizieR on-line data: <Available at CDS (J/A+A/541/A77): table3.dat>

Status in Simbad:  could be processed

Simbad objects: 93

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Number of rows : 93

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 SDSS J000009.38+135618.4 QSO 00 00 09.3825191248 +13 56 18.461967904   19.06 18.63     ~ 20 0
2 2SLAQ J000326.67+001157.1 QSO 00 03 26.6744434149 +00 11 57.230551884   19.56 19.34     ~ 12 0
3 SDSS J000625.25+154625.8 QSO 00 06 25.2560732212 +15 46 25.796979018   23.39 21.81     ~ 12 0
4 SDSS J000728.45-042345.5 QSO 00 07 28.4546367104 -04 23 45.602851026           ~ 4 0
5 SDSS J000920.01+005618.4 QSO 00 09 20.0169292470 +00 56 18.442203627   20.60 20.38     ~ 13 0
6 QSO J0050-0053 QSO 00 50 06.3503159448 -00 53 19.234815402   22.45 21.20     ~ 30 0
7 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9112 1
8 [VV2006] J010540.7-003313 QSO 01 05 40.7575131429 -00 33 13.853535908   19.72 18.76     ~ 33 0
9 SDSS J014349.14+002128.4 QSO 01 43 49.1530 +00 21 28.331   18.71 18.34     ~ 17 1
10 [VV2006] J014733.5+000323 QSO 01 47 33.5800440298 +00 03 23.300719440   18.54 18.08     ~ 20 0
11 [VV2006] J014905.2-011405 QSO 01 49 05.2795995187 -01 14 04.922752081   21.90 20.96     ~ 26 0
12 [VV2006] J015151.6-093214 QSO 01 51 51.5838221371 -09 32 15.392989130   21.61 20.85     ~ 16 0
13 SDSS J020534.13+215559.7 WD* 02 05 34.0869434585 +21 55 59.601225428           DZ 6 0
14 SDSS J020731.82+004941.6 * 02 07 31.8217544559 +00 49 41.650713641           ~ 1 1
15 [VV2006] J021102.3-081007 QSO 02 11 02.3318183622 -08 10 07.461295828   20.90 20.14     ~ 15 0
16 PHL 4255 WD* 02 40 58.8008948272 -00 39 34.523827050   17.91       DC 9 0
17 2XMM J024230.6-000030 QSO 02 42 30.6519133167 -00 00 29.623535634   21.06 20.10     ~ 21 0
18 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 3993 2
19 SDSS J032907.24+002438.4 QSO 03 29 07.248 +00 24 38.43           ~ 1 0
20 SDSS J033716.08+000041.7 QSO 03 37 16.088 +00 00 41.78           ~ 1 0
21 QSO J0338+0056 QSO 03 38 10.8538290501 +00 56 17.691802846   20.11 19.38     ~ 27 0
22 SDSS J073816.91+314437.1 QSO 07 38 16.9137392570 +31 44 37.053893246   20.23 19.50     ~ 15 0
23 [VV2006] J075437.8+422115 BLL 07 54 37.8566406135 +42 21 15.272754483   21.51 20.64     ~ 22 0
24 [VV2006] J075518.3+245432 QSO 07 55 18.3108380410 +24 54 32.313381480   20.44 19.83     ~ 16 0
25 [VV2006] J081024.7+480616 QSO 08 10 24.7512928648 +48 06 15.461892512   20.82 20.07     ~ 23 0
26 2MASS J08195979+5356243 QSO 08 19 59.7573 +53 56 24.557   20.64 20.24 19.92 19.39 ~ 16 0
27 [VV2006] J082350.5+244653 QSO 08 23 50.5371908353 +24 46 53.118452065   20.73 20.14     ~ 14 0
28 SDSS J082747.14+425241.1 QSO 08 27 47.1544988357 +42 52 41.107588511   21.42 20.60     ~ 15 0
29 SDSS J084357.71+115624.1 * 08 43 57.7167054609 +11 56 23.897408564           DC 2 1
30 SDSS J085502.20+280219.6 QSO 08 55 02.2047855102 +28 02 19.693285944   22.16 21.09     ~ 11 0
31 [VV2006] J090334.9+502819 QSO 09 03 34.9475 +50 28 19.293   22.90 21.49     ~ 40 2
32 2XMMi J091613.5+292106 QSO 09 16 13.6029288135 +29 21 06.246726913   19.96 19.35 18.660   ~ 17 0
33 [VV2006] J091941.0+064459 QSO 09 19 40.9726901587 +06 44 59.968939637   20.63 19.82     ~ 20 0
34 [VV2006] J092211.6+365120 QSO 09 22 11.5643206674 +36 51 20.297802670   18.84 18.41     ~ 14 0
35 SDSS J093437.53+262232.6 QSO 09 34 37.5353242273 +26 22 32.731170775           ~ 9 0
36 [VV2006] J094225.4+565613 QSO 09 42 25.4205497953 +56 56 13.038170736   19.53 19.01     ~ 21 0
37 QSO J0943+5417 QSO 09 43 17.6020516320 +54 17 05.102462623   23.81 22.37 20.80   ~ 21 0
38 EGGR 252 WD* 10 01 49.3635164637 +14 41 23.789237733   15.86 15.40 15.62   DC7 34 1
39 2MASS J10023723+2700565 QSO 10 02 37.2255667817 +27 00 56.466490350   18.12 17.56     ~ 10 0
40 [VV2006] J100353.6+515458 QSO 10 03 53.6813709225 +51 54 57.072424154   20.00 19.33     ~ 16 0
41 SDSS J100658.64+121133.9 WD* 10 06 58.6398245297 +12 11 33.825015745           DA+M 9 0
42 2MASS J10172303+2303223 QSO 10 17 23.0379262374 +23 03 22.180628049   20.05 19.44     ~ 8 0
43 [VV2006] J101912.8+410807 QSO 10 19 12.8463603184 +41 08 07.428668826   20.33 19.53     ~ 19 0
44 V* IL Leo CV* 10 31 00.5569721340 +20 28 32.303887137   18.67 18.71     ~ 11 0
45 2MASS J10341024+3442008 QSO 10 34 10.2661552380 +34 42 00.833939368   20.91 19.96     ~ 16 0
46 [VV2006] J103443.7+411120 QSO 10 34 43.6747930999 +41 11 20.467507919   20.23 19.74     ~ 16 0
47 SDSS J104513.86+171952.2 QSO 10 45 13.8657058654 +17 19 52.327905789   20.93 20.03     ~ 7 0
48 [VV2000] J105528.8+312411 QSO 10 55 28.8005120380 +31 24 11.251421058   17.80 17.41     ~ 18 0
49 2MASS J11051114+5308066 QSO 11 05 11.1460122431 +53 08 06.621394205   22.30 20.86     ~ 18 0
50 SDSS J110711.40+082331.2 QSO 11 07 11.4073760303 +08 23 31.320809936   21.14 20.30     ~ 14 0
51 [VV2006] J112526.1+002901 QSO 11 25 26.1194812139 +00 29 01.354275338   19.93 19.15     ~ 38 0
52 2QZ J112828.3+011337 QSO 11 28 28.3094593877 +01 13 37.900575311   19.94 19.23     ~ 27 1
53 [VV2006] J112851.8+062315 QSO 11 28 51.8402813537 +06 23 15.397794113   18.72 18.14     ~ 15 0
54 [VV2006] J114756.0-025023 QSO 11 47 56.0030251011 -02 50 23.406832433   21.43 20.55     ~ 25 0
55 2MASS J12033793+1530065 QSO 12 03 37.9198722539 +15 30 06.660401110   19.35 18.69     ~ 15 0
56 QSO J1214-0001 QSO 12 14 41.4302900196 -00 01 37.881348692   19.64 19.12     ~ 29 0
57 [VV2006] J122622.0+662017 QSO 12 26 22.0306630719 +66 20 18.018059892   22.85 21.49     ~ 20 0
58 [VV2006] J124244.4+624659 QSO 12 42 44.3605251553 +62 46 59.078789729   17.61 17.20     ~ 18 0
59 [VV2006] J130941.4+112539 QSO 13 09 41.3597314636 +11 25 40.217227825   20.37 19.46     ~ 18 0
60 SDSS J131524.00+041734.4 QSO 13 15 24.0067082495 +04 17 34.515585862   19.53 19.25     ~ 14 0
61 V* PZ Vir AM* 13 24 11.5588595574 +03 20 50.504327335   22.47 21.37 20.5   M5:V 23 0
62 [VV2006] J134026.4+634432 QSO 13 40 26.4383794408 +63 44 33.105321227   20.83 20.28     ~ 20 0
63 [VV2006] J134246.2+284027 QSO 13 42 46.2475370395 +28 40 27.510260494   21.06 19.97     ~ 11 0
64 SDSS J134913.52+205646.9 WD* 13 49 13.5424112164 +20 56 46.988135718   18.5 19.22 18.8   DAH 4 1
65 FIRST J134951.9+382334 QSO 13 49 51.9411574766 +38 23 34.164402846   21.35 20.18     ~ 19 0
66 [VV2006] J135048.7+433406 QSO 13 50 48.6740805452 +43 34 06.264099842   19.28 19.08     ~ 18 0
67 [VV2006] J135246.3+423923 QSO 13 52 46.3769741553 +42 39 23.588705456   19.22 18.38     ~ 17 0
68 [VV2000] J140800.5+345125 QSO 14 08 00.4419059780 +34 51 24.763079880   18.17 17.61     ~ 21 0
69 QSO J1408+3054 QSO 14 08 06.2086888000 +30 54 48.417721548   18.38 17.97     ~ 43 0
70 [VV2006] J142010.3+604722 QSO 14 20 10.2830649789 +60 47 22.424995728   21.11 20.42     ~ 15 0
71 [VV2006] J143446.0+422516 QSO 14 34 45.9576504750 +42 25 16.730326595   19.04 18.75     ~ 14 0
72 [VV2006] J144002.2+371058 QSO 14 40 02.2451805933 +37 10 58.506931087   20.82 19.86     ~ 13 0
73 SDSS J144354.73+242906.6 PM* 14 43 54.7689874270 +24 29 07.132953784   22.97 21.69     ~ 3 0
74 2MASS J14504562+4615043 QSO 14 50 45.5631806189 +46 15 04.245252063   20.81 20.20     ~ 14 0
75 [VV2000] J150321.4+233059 Sy1 15 03 21.3730488759 +23 30 59.903090888   19.22 18.95     ~ 16 0
76 QSO B1502+1041 QSO 15 04 24.97978142 +10 29 39.1986151   18.97 18.56 18.94   ~ 439 1
77 [VV2006] J150848.8+605552 QSO 15 08 48.8023510544 +60 55 51.968282830   19.95 19.21     ~ 17 0
78 SDSS J151150.23+140506.4 QSO 15 11 50.2410213127 +14 05 06.469565104           ~ 3 0
79 [VV2006] J151627.4+305219 QSO 15 16 27.4020836760 +30 52 19.769052013   19.48 18.80     ~ 16 0
80 2MASS J15215647+5202387 QSO 15 21 56.4822619037 +52 02 38.598808258   16.02 15.70     ~ 39 0
81 SDSS J152156.58+265556.6 QSO 15 21 56.5812351715 +26 55 56.648454846   21.03 20.35     ~ 16 0
82 FIRST J152438.7+415543 QSO 15 24 38.7866151649 +41 55 43.066853388   19.81 19.22     ~ 16 0
83 ICRF J153939.1+274438 QSO 15 39 39.1373725234 +27 44 38.197606739   19.13 18.76 17.29   ~ 59 1
84 QSO J1556+3517 QSO 15 56 33.7770938780 +35 17 57.387199648   21.39 20.68 19.07   ~ 80 1
85 2MASS J16082709+0758114 QSO 16 08 27.0896048457 +07 58 11.553745817   18.39 17.68     ~ 14 0
86 SDSS J161836.09+153313.5 QSO 16 18 36.0982872242 +15 33 13.515009913   20.39 19.67     ~ 10 0
87 2MASS J16252772+0933333 QSO 16 25 27.7375932839 +09 33 32.793743898   21.34 20.34     ~ 6 0
88 SDSS J164847.85+374006.4 QSO 16 48 47.8595072338 +37 40 06.459726994   20.39 19.78     ~ 13 0
89 [VV2006] J164941.9+401455 QSO 16 49 41.8729537651 +40 14 55.954953359   19.48 18.77     ~ 18 0
90 2MASS J17304908+5850597 QSO 17 30 49.1259383079 +58 50 59.596956565   24.03 22.63     ~ 22 0
91 [VV2006] J215950.3+124718 QSO 21 59 50.3060280852 +12 47 18.431271880   21.71 21.26     ~ 17 0
92 [VV2006] J220445.3+003142 QSO 22 04 45.2720783908 +00 31 41.845417539   18.89 17.94     ~ 27 0
93 [VV2006] J220557.0+121239 QSO 22 05 57.0260017957 +12 12 39.676612129   18.77 18.43     ~ 18 0

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2019.11.20-22:00:25

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