1999ApJ...518..219K

Query : 1999ApJ...518..219K

1999ApJ...518..219K - Astrophys. J., 518, 219-225 (1999/June-2)

Spectropolarimetry of the luminous narrow-line Seyfert galaxies IRAS 20181-2244 and IRAS 13224-3809.

KAY L.E., MAGALHAES A.M., ELIZALDE F. and RODRIGUES C.

Abstract (from CDS):

We observed the narrow-line Seyfert 1 galaxies IRAS 20181-2244 and IRAS 13224-3809 with a new spectropolarimeter on the Ritchey-Chrétien spectrograph at the CTIO 4 m telescope. Previously it had been suggested that IRAS 20181-2244 was a type 2 QSO and thus might contain an obscured broad-line region that could be detected by the presence of broad Balmer lines in the polarized flux. We found the object to be polarized at about 2% and constant with wavelength (unlike most narrow-line Seyfert 1 galaxies), but with no evidence of broad Balmer lines in polarized flux. The spectropolarimetry indicates that the scattering material is inside the broad-line region. IRAS 13224-3809, notable for its high variability in X-ray and UV wavelengths, has a low polarization consistent with a Galactic interstellar origin.

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Journal keyword(s): Galaxies: Active - galaxies: individual (IRAS 20181-2244, IRAS 13224-3809) - Galaxies: Seyfert - Polarization

Nomenclature: Table 2: [KME99] N (Nos 1-7).

Simbad objects: 19

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Number of rows : 19
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 1502 Sy1 00 53 34.9331107632 +12 41 35.929269132   14.41 14.03     ~ 1242 1
2 HD 298383 * 09 22 29.7726126312 -52 28 57.297210744   10.34 9.75     A0Ib 35 0
3 Z 212-25 Sy1 10 34 38.5982990352 +39 38 28.187042604   17.37 16.90     ~ 402 1
4 HD 98161 PM* 11 17 12.0072710256 -38 00 51.722245584   6.336 6.235     A1V 44 0
5 * 20 Crt PM* 11 34 29.4864443348 -32 49 52.822793411   6.79 5.98 7.17   K0V 259 0
6 NGC 4253 Sy1 12 18 26.5163572920 +29 48 46.531535472   14.34 13.57     ~ 1106 1
7 LEDA 42648 Sy1 12 42 10.6050409800 +33 17 02.662913436   16.45 15.65     ~ 128 0
8 HD 110984 * 12 46 44.8303084512 -61 11 11.518388556 8.93 9.50 9.03 9.52   B1II/III 51 0
9 HD 114981 Be* 13 14 40.6843201920 -38 39 05.650899840 6.43 7.07 7.12     B5V 55 0
10 HD 116413 * 13 24 03.4012347600 -35 33 21.457313316   9.07 9.04     A0V 11 0
11 LEDA 88835 Sy1 13 25 19.3805530608 -38 24 52.611680340   16.64 13.80 15.33 14.78 ~ 457 0
12 * d Cen ** 13 31 02.6565951 -39 24 26.298992 6.08 5.04 3.88 3.04 2.45 G8II/III 81 0
13 HD 117597 PM* 13 32 05.4258837048 -38 23 55.863359808   7.185 6.148     K1III 21 0
14 IRAS 13349+2438 Sy1 13 37 18.7199358192 +24 23 03.319883484     15.0     ~ 410 0
15 Mrk 486 Sy1 15 36 38.4011947776 +54 33 33.215039244   15.21 14.78     ~ 292 1
16 6C 170204+454510 Sy1 17 03 30.3824218008 +45 40 47.166180564   16.0       ~ 170 2
17 HD 155197 * 17 10 15.7466372208 -04 50 03.657092136   10.16 9.56     F0V 53 0
18 * eta Aql cC* 19 52 28.3689223781 +01 00 20.371980515 5.12 4.61 3.80   3.030 F6Iab+B9.8V 701 0
19 2MASX J20210438-2235183 Sy1 20 21 04.0639 -22 35 25.775   17.53 16.8 16.28   ~ 46 1

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