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J/A+A/310/384 Optical brightness of 3 ROSAT Seyfert galaxies (Greiner+, 1996)
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Four new active galaxies with steep soft X-ray spectra
Greiner J., Danner R., Bade N., Richter G.A., Kroll P., Komossa S.
<Astron. Astrophys. 310, 384 (1996)>
=1996A&A...310..384G (SIMBAD/NED BibCode)
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ADC_Keywords: Active gal. nuclei ; Galaxies, optical ; Galaxies, photometry
Keywords: X-ray sources - galaxies: active - galaxies: RX J1225.7+2055;
RX J1239.3+2431; RX J1250.2+1923; RX J1257.5+2412
Mission_Name: ROSAT
Description:
The printed version of this paper describes the X-ray and optical
properties of four new active galaxies discovered in the ROSAT All-Sky
Survey. While one object (RX J1257.5+2412) is identified as a BL Lac
object, the other three (RX J1239.3+2431, RX J1225.7+2055, and RX
J1250.2+1923) are narrow line Seyfert 1 galaxies. Three of these four
objects are bright enough to be studied on archival photographic
plates of Sonneberg Observatory. The present list contains the
individual brightness measurements of these objects all of which
turned out to be variable on timescales of weeks to years. Some
lightcurves (long-term as well as short-term) are given in the printed
version.
Objects:
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RA (2000) DE Name
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12 25.7 +20 55 RX J1225.7+2055 = S10942
12 57.5 +24 12 RX J1257.5+2412 = S10941
12 39.3 +24 31 RX J1239.3+2431 = S10940
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table 42 555 Optical brightness estimates
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Byte-by-byte Description of file: table
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Bytes Format Units Label Explanations
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1- 11 F11.3 d HJD Julian date of middle of exposure time.
The exposure time ranges between 40-60 min.
14- 17 F4.1 mag Mag1 ? Brightness estimate for RX J1225.7+2055
20- 23 A4 --- n_Mag1 Comment on accuracy of brightness estimate of
RX J1225.7+2055 (1)
25- 28 F4.1 mag Mag2 ? Brightness estimate for RX J1257.5+2412
31- 33 A3 --- n_Mag2 Comment on accuracy of brightness estimate of
RX J1257.5+2412 (1)
35- 38 F4.1 mag Mag3 ? Brightness estimate for RX J1239.3+2431
41- 43 A3 --- n_Mag3 Comment on accuracy of brightness estimate of
RX J1239.3+2431 (1)
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Note (1): No entry in the comment column means an accurate
brightness estimate (error of +/-0.08 mag), while the five
different signs have the following meanings:
< denotes an upper limit,
: denotes a slightly increased error (+/-0.14 mag),
:: denotes an increased error (+/-0.20 mag),
? denotes an uncertain measurement,
?? denotes a doubtful measurement.
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(End) Patricia Bauer [CDS] 20-Dec-1995