Access to Astronomical Catalogues

← Click to display the menu
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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 112 563 Observed data of the IR-defined sample dates.dat 30 30 Observation dates
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
Bytes Format Units Label Explanations
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 12mum (2) 41 A1 --- l_S25 Limit flag on S25 42- 47 F6.2 Jy S25 IRAS flux density at 25mum (2) 49- 54 F6.2 Jy S60 IRAS flux density at 60mum (2) 56 A1 --- l_S100 Limit flag at 100µm 57- 62 F6.2 Jy S100 IRAS flux density at 100mum (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)
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.
Byte-by-byte Description of file: dates.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Dat Date code number 4- 6 A3 --- Obs Observatory 8- 17 A10 --- Range Wavelength range 19- 30 A12 --- Date Observation date
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
(End) James Marcout, Patricia Bauer [CDS] 02-Jan-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact