2000ApJ...528..637B


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.15CEST22:24:23

2000ApJ...528..637B - Astrophys. J., 528, 637-649 (2000/January-2)

On the nature of soft X-ray weak quasi-stellar objects.

BRANDT W.N., LAOR A. and WILLS B.J.

Abstract (from CDS):

Recent studies of quasi-stellar objects (QSOs) with ROSAT suggest the existence of a significant population of soft X-ray weak QSOs (SXW QSOs) where the soft X-ray flux is ∼10-30 times smaller than in typical QSOs. Why are these QSOs soft X-ray weak, and what is their relationship to broad absorption line QSOs (BAL QSOs) and X-ray warm absorber QSOs? As a first step in a systematic study of these objects, we establish a well-defined sample of SXW QSOs that includes all αox≤-2 QSOs from the Boroson & Green sample of 87 Bright Quasar Survey QSOs. SXW QSOs comprise ~11% of this optically selected QSO sample, and we find soft X-ray weakness in both radio-quiet and radio-loud QSOs. From an analysis of C IV absorption in the 55 Boroson & Green QSOs with available C IV data, we find a remarkably strong correlation between αox and the C IV absorption equivalent width. This correlation suggests that absorption is the primary cause of soft X-ray weakness in QSOs, and it reveals a continuum of absorption properties connecting unabsorbed QSOs, X-ray warm absorber QSOs, SXW QSOs, and BAL QSOs. Many of our SXW QSOs have ultraviolet absorption that is intermediate in strength between that of X-ray warm absorber QSOs and that of BAL QSOs, and their X-ray absorption is also likely to be of intermediate strength. From a practical point of view, our correlation demonstrates that selection by soft X-ray weakness is an effective (≳80% successful) and observationally inexpensive way to find low-redshift QSOs with strong and interesting ultraviolet absorption.

We have also identified several notable differences between the optical emission-line properties of SXW QSOs and those of the other Boroson & Green QSOs. SXW QSOs show systematically low [O III] luminosities and equivalent widths as well as distinctive Hβ line profiles. They tend to lie toward the weak [O III] end of Boroson & Green eigenvector 1, as do many low-ionization BAL QSOs. Unabsorbed Seyfert galaxies and QSOs with similar values of eigenvector 1 have been suggested to have extreme values of a primary physical parameter, perhaps mass accretion rate relative to the Eddington rate (M{dot}/M{dot}Edd). If these suggestions are correct, it is likely that SXW QSOs also tend to have generally high values of M{dot}/M{dot}Edd. Finally, we present and discuss correlations between αox and other QSO observables after removal of the SXW QSOs.


Abstract Copyright:

Journal keyword(s): Galaxies: Active - Galaxies: Nuclei - Galaxies: Quasars: General - X-Rays: Galaxies

Simbad objects: 87

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Number of rows : 87

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 2E 12 Sy1 00 05 59.2379634379 +16 09 49.023089304   16.51 16.40     ~ 270 1
2 Mrk 335 Sy1 00 06 19.5371542746 +20 12 10.617456059   14.19 13.85     ~ 1133 0
3 Mrk 1501 Sy1 00 10 31.0058529490 +10 58 29.505989476   15.96 15.40 12.22   ~ 659 0
4 2E 93 Sy1 00 29 13.7012280721 +13 16 03.946876800   15.70 15.41     ~ 404 0
5 QSO B0043+0354 Sy1 00 45 47.2230875166 +04 10 23.385233220   15.88 16.00     ~ 151 0
6 Mrk 1148 Sy1 00 51 54.7635184923 +17 25 58.507740633   16.44 15.96     ~ 131 0
7 Mrk 1502 Sy1 00 53 34.9326560879 +12 41 35.927159668   14.41 14.03     ~ 1064 1
8 2E 217 Sy1 00 54 52.1185254329 +25 25 38.983464017     15.42     ~ 346 0
9 Mrk 1014 Sy1 01 59 50.2529351498 +00 23 40.874250335   16.08 15.87     ~ 524 0
10 2E 1919 Sy1 08 10 58.6637281539 +76 02 42.449416413   15.03 14.71     ~ 426 0
11 MCG+13-07-002 Sy1 08 44 45.3000235915 +76 53 09.466820353     15.7     ~ 174 0
12 Ton 951 Sy1 08 47 42.4487014731 +34 45 04.483113429   14.83 14.50     ~ 430 0
13 Mrk 110 Sy1 09 25 12.8479868736 +52 17 10.386808297   16.82 16.41     ~ 525 0
14 Ton 1057 Sy1 09 25 54.7143564689 +19 54 05.065773105   16.02 15.89     ~ 155 0
15 Mrk 705 Sy1 09 26 03.2700194281 +12 44 03.727016859   15.15 14.60     ~ 287 0
16 Mrk 707 Sy1 09 37 01.0469474034 +01 05 43.750303841   16.86 16.64     ~ 126 0
17 2MASX J09504838+3926503 Sy1 09 50 48.3802745374 +39 26 50.463708894   16.83 16.73     ~ 173 0
18 PG 0953+414 Sy1 09 56 52.3930851607 +41 15 22.212153978 14.710 15.611 15.546 15.294 14.720 ~ 423 0
19 2MASS J10042013+0513004 Sy1 10 04 20.1377652635 +05 13 00.396937782   16.73 16.55     ~ 219 1
20 4C 13.41 Sy1 10 07 26.0965727406 +12 48 56.188170981   15.81 15.68     ~ 381 2
21 QSO B1011-040 Sy1 10 14 20.6737918236 -04 18 40.372348306   15.49 15.5     ~ 120 0
22 2dFGRS TGN357Z241 Sy1 10 14 54.9035683018 +00 33 37.367546308   20.23 18.94 16.104   ~ 150 0
23 Mrk 142 Sy1 10 25 31.2788890554 +51 40 34.868795739   16.33 16.12     ~ 245 0
24 2E 2340 Sy1 10 51 29.9161805242 -09 18 10.190625278   16.85 16.79 16.5   ~ 180 1
25 QSO B1048+342 Sy1 10 51 43.8919513785 +33 59 26.686941538   17.11 16.79     ~ 168 0
26 PG 1049-005 Sy1 10 51 51.4474876950 -00 51 17.709169017   15.98 15.78     ~ 155 0
27 2E 2389 Sy1 11 04 13.8613944317 +76 58 58.192391742   15.70 15.72 15.40   ~ 515 1
28 QSO B1103-006 Sy1 11 06 31.7741855481 -00 52 52.381519650   16.39 16.46     ~ 208 1
29 2MASSI J1117064+441333 Sy1 11 17 06.3986665282 +44 13 33.327898429   16.32 16.12     ~ 217 0
30 2MASSI J1118302+402553 Sy1 11 18 30.2896275867 +40 25 54.069567643   16.34 16.21     ~ 196 0
31 Ton 1388 Sy1 11 19 08.6786143504 +21 19 17.986556889   14.91 14.80     ~ 424 0
32 IC 2746 Sy2 11 21 47.1180110072 +11 44 18.908935072   15.38 14.93     ~ 204 0
33 2MASSI J1124392+420144 Sy1 11 24 39.1798727783 +42 01 45.013639656   16.45 16.28     ~ 138 0
34 Mrk 1298 Sy1 11 29 16.7289412438 -04 24 07.245397091   14.97 14.61     ~ 176 1
35 2MASX J11520354-1122242 Sy1 11 52 03.5502472437 -11 22 24.089795654   13.7 15.5 12.5   ~ 94 0
36 2MASS J11534927+1128306 Sy1 11 53 49.2708498209 +11 28 30.403108852   16.87 16.71     ~ 115 0
37 2E 2584 Sy1 12 04 42.1097577213 +27 54 11.867990165   15.64 15.60     ~ 358 0
38 PB 3894 Sy1 12 14 17.6737003918 +14 03 13.182526431   14.46 14.19     ~ 758 0
39 PG 1216+069 Sy1 12 19 20.9316038223 +06 38 38.467864632   15.68 15.65     ~ 261 0
40 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5436 1
41 Mrk 771 Sy1 12 32 03.6224248141 +20 09 29.495841579   15.57 15.30     ~ 447 0
42 LBQS 1244+0238 Sy1 12 46 35.2527388863 +02 22 08.784237661   16.57 16.37     ~ 264 0
43 LB 2522 Sy1 13 01 12.9251198286 +59 02 06.693745440   16.04 15.89     ~ 253 0
44 ICRF J130533.0-103319 Sy1 13 05 33.0149111397 -10 33 19.430590671   15.18 15.23 14.46   ~ 515 1
45 2E 2978 Sy1 13 09 47.0029670396 +08 19 48.215010428   16.04 15.89     ~ 353 0
46 Ton 1565 Sy1 13 12 17.7526648504 +35 15 21.087644341   15.45 15.64 14.2   ~ 249 1
47 2MASX J13130580-1107424 Sy1 13 13 05.7811787784 -11 07 42.367592509   15.48 15.15 13.4   ~ 108 0
48 2XMM J132349.6+654148 Sy1 13 23 49.5183330047 +65 41 48.166159616   16.01 15.84     ~ 156 0
49 Ton 730 Sy1 13 43 56.7433437047 +25 38 47.639948043   16.48 16.6     ~ 108 0
50 2XMM J135315.8+634546 Sy1 13 53 15.8310776491 +63 45 45.682560611   14.54 14.28     ~ 361 0
51 Mrk 662 Sy1 13 54 06.4279931034 +23 25 49.348440004   16.06 15.37     ~ 92 0
52 PB 4142 Sy1 13 54 35.6873746503 +18 05 17.504062479   16.84 16.68     ~ 203 0
53 2MASSI J1356327+210352 Sy1 13 56 32.7989546928 +21 03 52.364916739   15.85 17.07     ~ 88 0
54 Ton 182 Sy1 14 05 16.2180155773 +25 55 34.116787862   15.42 15.34     ~ 235 0
55 2MASX J14062191+2223462 Sy1 14 06 21.8899286041 +22 23 46.515082049   16.62 16.42     ~ 212 0
56 2MASS J14134834+4400141 Sy1 14 13 48.3307115344 +44 00 14.005465999   14.99 14.99     ~ 357 0
57 2MASSI J1417008+445606 Sy1 14 17 00.8223053485 +44 56 06.331286859   16.93 16.63     ~ 229 0
58 2E 3238 Sy1 14 19 03.8170384929 -13 10 44.781525412   16.46 16.10 16.50   ~ 223 0
59 Ton 202 Sy1 14 27 35.6081505943 +26 32 14.540877233   15.96 16.00     ~ 278 1
60 Mrk 1383 Sy1 14 29 06.5718492666 +01 17 06.155981953   15.21 14.87     ~ 421 0
61 2MASSI J1429430+474726 Sy1 14 29 43.0740635196 +47 47 26.215326061   17.29 16.97     ~ 158 0
62 2E 3305 Sy1 14 38 16.1631779228 -06 58 20.662522112   16.13 16.01 15.5   ~ 112 0
63 Mrk 478 Sy1 14 42 07.4713423763 +35 26 22.939531895   14.91 14.58     ~ 497 0
64 2MASSI J1446459+403505 Sy1 14 46 45.9392876678 +40 35 05.797848407   16.28 16.11     ~ 269 0
65 2MASX J14510879+2709272 Sy1 14 51 08.7649690311 +27 09 26.964855405   15.01 15.01     ~ 167 0
66 Mrk 841 Sy1 15 04 01.1935077982 +10 26 15.778741853   14.50 14.27     ~ 596 0
67 4C 37.43 Sy1 15 14 43.0682940988 +36 50 50.355363752   17.11 17.01 15.83   ~ 379 1
68 2E 1519.0+2238 Sy1 15 21 14.2570279616 +22 27 43.829185560   16.09 16.09     ~ 118 0
69 Mrk 290 Sy1 15 35 52.4036488200 +57 54 09.516647866   15.55 15.27     ~ 465 0
70 Mrk 486 Sy1 15 36 38.4013129866 +54 33 33.214684833   15.21 14.78     ~ 256 0
71 QSO B1544+4855 Sy1 15 45 30.2362003284 +48 46 08.978296070   16.92 16.73     ~ 216 0
72 2MASX J15474353+2052167 Sy1 15 47 43.5377678391 +20 52 16.613895999   16.80 16.69 15.70   ~ 457 0
73 2MASS J15544457+0822213 Sy1 15 54 44.5797394405 +08 22 21.411836511   16.38 16.16     ~ 104 0
74 Mrk 876 Sy1 16 13 57.1791807197 +65 43 09.953889666   16.03 15.49     ~ 527 0
75 Ton 256 Sy1 16 14 13.2049266694 +26 04 16.223082335   16.06 16.50     ~ 234 1
76 Mrk 877 Sy1 16 20 11.2800014833 +17 24 27.514065981   15.79 15.39     ~ 253 0
77 QSO B1626+5529 Sy1 16 27 56.1124169072 +55 22 31.559608363   15.79 15.68     ~ 191 0
78 IRAS 17002+5153 Sy1 17 01 24.8267412895 +51 49 20.447125726   15.49 15.12     ~ 363 0
79 2A 1705+609 Sy1 17 04 41.3742389551 +60 44 30.522600868   15.65 15.40 15.30   ~ 728 1
80 2MASS J21145258+0607423 Sy1 21 14 52.5774242314 +06 07 42.435724828   16.06 15.77     ~ 201 0
81 Mrk 1513 Sy1 21 32 27.8163185343 +10 08 19.250705656   14.92 14.64     ~ 557 0
82 QSO B2209+184 BLL 22 11 53.8892047549 +18 41 49.859069658   16.09 15.44 11.96   ~ 145 1
83 Mrk 304 Sy1 22 17 12.2638362727 +14 14 20.918554073   15.02 14.66     ~ 325 0
84 2E 4626 Sy1 22 36 07.6824365479 +13 43 55.360331935   16.48 16.34     ~ 142 0
85 4C 11.72 BLL 22 54 10.4213843099 +11 36 38.745749268   16.02 15.82     ~ 323 1
86 2MASX J23070290+0432567 Sy1 23 07 02.9149298268 +04 32 57.098187867   16.32 15.50     ~ 94 0
87 4C 09.72 BLL 23 11 17.7543884785 +10 08 15.754791578   16.15 16.00     ~ 183 1

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2021.05.15-22:24:24

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