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Date and Time of the Query: 2019-04-23 T17:43:28 PDT
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Notes for object SDSS J100032.23+553630.9

1 note(s) found in NED.


1. 2007A&A...470..557C
Re:XBS J100032.5+553626
XBSJ100032.5+553626. The optical classification of this object is controversal
in the literature: from the one hand it has been classified as Seyfert 2 by
Mason et al. (2000) and, on the other hand, it has been included in a list of
~2000 NLSy1 extracted from the SDSS by Zhou et al. (2006). The SDSS optical
spectrum shows strong emission lines on a blue continuum (the 4000 A break is =
7 +/- 5%). The widths of the permitted lines (e.g. the H{beta}) are very small
(<400 km s^-1^) and much narrower than the narrowest permitted lines observed in
the NLSy1 of the XBS survey (the H{beta} widths of the NLSy1 in the XBS survey
range from 900 to 1800 km s^-1^, Caccianiga et al. 2007, in prep.). Additionally
the strenght of the FeII{lambda}4570 A normalized to the H{beta} line (the
R_4570_ parameter) is lower (0.28, Zhou et al. 2006) than what is usually
observed in NLSy1 (typically R_4570_ > 0.50, e.g. Veron-Cetty et al. 2001).
Finally, the images taken from the SDSS clearly show an extended source without
obvious indication of a strong nucleus. For all these reasons we do not adopt
the NLSy1 classification and we prefer a classification as starburst. Indeed,
the critical line ratios ([OIII]{lambda}5007 A/H{beta} and
[NII]{lambda}6583/H{alpha}) put the source in the starburst/AGN+starburst
composite spectrum region in the Veilleux & Osterbrock (1987) diagnostic plot.


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