J/A+AS/96/389 Warm IRAS sources. II. (de Grijp+, 1992)
Warm IRAS sources.
II. Optical spectroscopy of objects from the point source catalog.
de Grijp M.H.K., Keel W.C., Miley G.K., Goudfrooij P., Lub J.
<Astron. Astrophys. Suppl. Ser. 96, 389 (1992)>
=1992A&AS...96..389D 1992A&AS...96..389D
ADC_Keywords: Galaxies, IR ; Spectroscopy ; Redshifts
Keywords: active galaxies - Seyferts - redshifts - spectroscopy
Abstract:
We present optical spectra for a sample of 563 high-latitude IRAS
sources selected from the Point Source Catalog to have relatively warm
25 to 60 micron colours. We have shown this selection criterion to be
an efficient indicator for finding Seyfert galaxies. Plots of the
optical spectra are shown and the fluxes of the strongest emission
lines in these spectra are tabulated. After excluding 128 sources
which are clearly galactic foreground objects, we obtained
spectroscopic information for 358 extragalactic objects. Emission-line
ratios have been used to classify these objects, resulting in 80
Seyfert 1, 141 Seyfert 2 and 133 HII-type objects. In comparison with
samples of active nuclei selected in other ways, about 50% of known
Seyfert nuclei are included by our colour criteria. This fraction is
larger for high luminosities, reaching 80% for quasar luminosities.
For lower-luminosity objects, contamination by the host galaxies
becomes important and the sample becomes seriously incomplete. It
should be moderately complete and representative for core luminosities
greater than 1023.5W/Hz at 12m. Finally, the infrared luminosity
function for each type of object is derived; the shapes for Seyfert 1
and 2 nuclei are identical, with a type 2/type 1 space-density ratio
of 3.0. Our census is consistent with an obscuration scheme for
producing both types of object from a single parent population, though
the origin of excess cool IR radiation Irom many Seyferts is still
unclear. We note the appearance of an apparent type II supernova in
IRAS 0225-103 observed in 1985 September. Its spectrum suggests that
it was observed between 1 and 2 months after maximum, perhaps in a
"plateau" phase.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 112 563 Observed data of the IR-defined sample
dates.dat 30 30 Observation dates
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See also:
J/A+AS/70/95 : Warm IRAS sources. I. AGN candidates (de Grijp+ 1987)
J/A+AS/108/61 : Warm IRAS sources. IV. (Fehmers+, 1994)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/563]+ Sequential number (from Paper I,
Cat. J/A+AS/70/95)
5- 8 A4 --- --- [IRAS]
9- 18 A10 --- IRAS IRAS (truncated) name, with multiplicity
(see remarks in the "History" section below)
20- 25 A6 --- Type Morphological type (HII, Seyf1, Seyf2)
27- 32 F6.4 --- z ? Heliocentric redshift (accuracy 0.0003)
33 A1 --- u_z [::?] Uncertainty flag on z
34 A1 --- l_S12 Limit flag on S12
35- 39 F5.2 Jy S12 IRAS flux density at 12µm (2)
41 A1 --- l_S25 Limit flag on S25
42- 47 F6.2 Jy S25 IRAS flux density at 25µm (2)
49- 54 F6.2 Jy S60 IRAS flux density at 60µm (2)
56 A1 --- l_S100 Limit flag at 100µm
57- 62 F6.2 Jy S100 IRAS flux density at 100µm (2)
64- 67 F4.1 mag Vmag ? V magnitude, corrected fril face-on and
galactic foreground absorption
69- 74 F6.3 [---] O/60 ? Ratio of optical to infrared flux (log scale)
76 A1 --- l_Hb Limit flag on Hb
77- 83 F7.2 aW/m2 Hb ? Hβ4861Å flux (in 10-15erg/cm2/s)
85 A1 --- l_[OIII] Limit flag on [OIII]/Hb
86- 90 F5.2 --- [OIII] ? [OIII]5007Å/Hβ4861Å ratio
92 A1 --- l_Ha/b Limit flag on Ha/Hb
93- 97 F5.2 --- Ha/b ? Hα6563Å/Hβ4861Å ratio
99 A1 --- l_[NII] Limit flag on [NII]/Hb
100-104 F5.2 --- [NII] ? [NII]6582Å/Hβ4861Å ratio
106-112 A7 --- Dat Date code in dates.dat file (1)
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Note (1): Date(s) on which an object was observed, coded as entry to column
1 of dates.dat file
Note (2): co-added IRAS fluxes (more accurate than the flux densities given
in the IRAS-PSC catalog [II/125]). When a source was not detected in
some wavelength band, a 3-σ upper limit is given.
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Byte-by-byte Description of file: dates.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Dat Date code number
4- 6 A3 --- Obs Observatory
8- 17 A10 --- Range Wavelength range
19- 30 A12 --- Date Observation date
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History:
* 30-Jun-2000: Prepared via OCR at CDS.
* 02-Jan-2011: some errors in OCR detected by H. Andernach.
Some names are incompatible with IRAS positions:
#141 IRAS 0438-086 (04385-0828), should be 0438-084 (not corrected)
#167 IRAS 0509-009 (05091+0058), corrected into 0509+009
#248 IRAS 0851+179 (08518+1752), should be 0851+178 (not corrected)
#456 IRAS 1750+508 (17500+5046), should be 1750+507 (not corrected)
#531 IRAS 2211-393 (22117-3903), should be 2211-390 (not corrected)
References:
Keel et al., Paper III 1994A&A...283..791K 1994A&A...283..791K
(End) James Marcout, Patricia Bauer [CDS] 02-Jan-2011