2004A&A...417..515V


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.24CEST02:47:08

2004A&A...417..515V - Astronomy and Astrophysics, volume 417, 515-525 (2004/4-2)

The unusual emission line spectrum of IZw1.

VERON-CETTY M.-P., JOLY M. and VERON P.

Abstract (from CDS):

Most Seyfert 1 galaxies show strong FeII lines in their spectrum having the velocity and width of the broad emission lines. To remove the FeII contribution in these objects, an accurate template is necessary. We used very high signal-to-noise, medium resolution archive optical spectra of IZw1 to build such a template. IZw1 is a bright narrow-line Seyfert 1 galaxy. As such it is well suited for a detailed analysis of its emission line spectrum. Furthermore it is known to have a very peculiar spectrum with, in addition to the usual broad and narrow line regions, two emission regions emitting broad and blue shifted [OIII] lines making it a peculiarly interesting object. While analysing the spectra, we found that the narrow-line region is, unlike the NLR of most Seyfert 1 galaxies, a very low excitation region dominated by both permitted and forbidden FeII lines. It is very similar to the emission spectrum of a blob in η Carinae which is a low temperature (Te∼6500K), relatively high density (Ne=106cm–3) cloud. The FeII lines in this cloud are mainly due to pumping via the stellar continuum radiation field (Verner et al., 2002ApJ...581.1154V). We did not succeed in modelling the spectrum of the broad-line region, and we suggest that a non radiative heating mechanism increases the temperature in the excited HI region, thus providing the necessary additional excitation of the FeII lines. For the low-excitation narrow-line region, we are able to apply boundaries to the physical conditions accounting for the forbidden and permitted FeII lines (106<Ne<107cm–3; 10–6<U<10–5).

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: individual: I Zw 1

VizieR on-line data: <Available at CDS (J/A+A/417/515): iwz1.fit>

CDS comments: In reflist, Ebbetts 1997 : the correct write is Ebbets and the right bibcode is 1997ApJ...489L.161E.

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 Mrk 1502 Sy1 00 53 34.9326560879 +12 41 35.927159668   14.41 14.03     ~ 1006 1
2 2MASX J03305218+0538253 Sy1 03 30 52.1823869806 +05 38 25.551427863   16.64 16.03     ~ 32 0
3 BD+52 913 WD* 05 05 30.6182785658 +52 49 51.920797126 10.25 11.44 11.69 11.93 12.108 DA.8 959 0
4 Ve 7-27 Em* 08 51 59.6873349537 -46 18 07.268122029   14.87 13.88 14.59 12.96 ~ 46 1
5 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2148 0
6 NGC 4151 Sy1 12 10 32.5771747733 +39 24 21.057727323   12.18 11.48     ~ 3307 2
7 ICRF J134733.3+121724 Sy2 13 47 33.36161542 +12 17 24.2402572   19.28 18.44 15.718   ~ 519 3
8 HD 140283 Pe* 15 43 03.0967798658 -10 56 00.595803430 7.508 7.711 7.212 6.63 8.21 F9VkA5mA1 844 0
9 V* XX Oph ** 17 43 56.4967929636 -06 16 08.787105588 10.51 9.81 8.59     M5IIe+Aep 139 0
10 BD+28 4211 HS* 21 51 11.0220905905 +28 51 50.366090892 8.922 10.25 10.58 10.656 10.831 sdO2VIIIHe5 721 0
11 UGC 12163 Sy1 22 42 39.3364258078 +29 43 31.301194419   14.86 14.16     ~ 601 1

    Equat.    Gal    SGal    Ecl

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2019.10.24-02:47:08

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