The ISO-IRAS Faint Galaxy Survey

Goal of Survey

Produce a deep catalog of Luminous Far Infrared Galaxies (LFIRG's) at anticipated redshifts of 0.1-1 by observing the very faintest IRAS Faint Source Survey (FSS) galaxy candidates with the Infrared Space Observatory (ISO).

Survey Sample

3776 sources selected from the IRAS Faint Source Catalog covering large fraction of high-latitude sky, of which we anticipate ~500 will be observed.
Faintness (greater distances): 60 µm flux < 0.3 Jy
Reasonable Detections (avoid cirrus): |b| > 30° to minimize Galactic confusion, ADDSCAN's inspected to reject marginal detections & cirrus features
Non-Stellar Colors (exclude stars): Increasing flux density from 12 to 60 µm
Large L_60µm/L_blue Ratio (select greatest luminosities): Blue magnitude limits of M_blue > 19, 17.5 for the southern, northern equatorial skies to select for the most luminous sources

Observing Strategy (through Revolution 613)

ISOCAM: LW10 (IRAS 12 µm) Filter
- 6" pixels, ~3 x 3' field of view
- 2 x 2 raster positions, 30" offsets
- 6 frames per raster, Tint = 2.1 sec/frame
ISOPHOT: C90 (90 µm) Filter
- Chopped PHT22 photometry
- 64 sec on-source integrations

Observing Strategy (Revolution 614-current)

ISOCAM updated for better sensitivity/redundancy
- 3 x 2 raster positions, 18 x 30" offsets
- 20 frames per raster, Tint = 2.1 sec/frame
- 300% increase in on-source integration time
ISOPHOT obs. suspended for this phase

Spectroscopic Survey
- 125 galaxies identified with 116 IRAS FSS sources observed at Lick and Palomar observatories.
- All are LIGs with 0.04 < z < 0.7, with strong emission lines.
- 1 QSO (F00237+2153) with z = 1.332.

Finding Charts

IPAC OPTID Finding Charts and positional data are available for 387 IRAS FSS fields with 1 or more good ISOCAM source. Finding charts are in PostScript format. Each field is 4' x 4' scquare centered on the IRAS FSS position. The FSS 1, 3 and 10

error ellipses are marked along with the ISOCAM position (concentric circles). Stellar objects are indicated as filled circles (occasionally as ellipses when double stars are unresolved) and galaxies as open ellipses. Relative brightness is indicated by size of the circle/ellipse. Object classification is poor at the fainter magnitudes and compact infrared galaxies at m > 19 are frequently classified as stellar.

The image below is the field of the z = 0.278 Luminous Infrared Galaxy associated with F14491+6040 (Levine et al. 1998, Smith et al. 2000) shown in the images above. The concentric circles mark the position of the ISOCAM source; objects numbered 1-6 (1 is unreadable in this frame) correspond to the first six objects in the text file, listed, in part, below the image. These are ordered by the likelihood of being the optical object associated with the IRAS source assuming the classification applied by the measuring engine. In this case the open ellipse coincident with the ISOCAM source (object #1) is shown to be a galaxy pair on the Digitized Sky Survey image and there is clear evidence for tidal interaction on the deeper G and I-band ccd images from Lick Observatory.

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Chart#   46               F14491+6040                                         
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    Name     Cat       RA  (J2000)  Dec     UncMaj   Min  PA  Glon Glat  Rel
F14491+6040  FSC  14h50m21.77s +60d28m24.9s  19.27  9.91  15   100   51   85
Fnu 12um   25um   60um  100um  SNR 12um  25um  60um 100um Cr IRBnd Grp# IRTyp
   0.051L 0.047L 0.135  0.299L    -99.0 -99.0   5.5 -99.0  1 60um    18  Gal 
 
Mch  RA (J2000) Dec    Rad" PA Dma"Dmi"Sig Cl Ba Mag  MagOC Rel RelUC Pid PidUC
01 145023.51 +602811.5  19 136 9.7  16 1.7 Ga B 19.8 (18.1) .440 .140 .400 .120
02 145022.98 +602823.2 9.1 101 0.7 9.1 0.9 Ga B 21.5 (25.5) .430 .150 .390 .140
03 145022.14 +602834.4 9.9  16 9.9 0.2 0.5 St B 21.8 (21.8) 0    .160 0    .150
04 145025.13 +602847.7  34  47  28  18 2.3 Ga B 21.8 (25.5) .140 .067 .086 .055
05 145017.83 +602824.1  29 268 8.2  28 2.9 St B 17.2 (17.2) 0    .080 0    .067
06 145024.58 +602833.1  22  68  13  18 1.9 St B 22.0 (22.0) 0    .077 0    .064

Here are the Charts:

Northern (Cambridge APM) POSS I finding charts - iifgs_apm.ps and report file - iifgs_apm.txt.
Southern (ROE COSMOS) SERC finding charts - iifgs_cosm.ps and report file - iifgs_cosm.txt.

Current Publications

Paper 1 (1998): "First Results from the ISO-IRAS Faint Galaxy Survey," D.A. Levine, C.J. Lonsdale, R.L. Hurt, H.E. Smith, G. Helou, C.A. Beichman, C. Cesarsky, D. Elbaz, U. Klaas, R. Laureijs, D. Lemke, S. Lord, R.G. McMahon, M. Moshir, G. Neugebauer, B.T. Soifer, D. Van Buren, A. Werhle, R.D. Wolstencroft, Ap.J, 504, 64-76. [Paper1.ps] [Paper1.pdf]
Paper 4 (2000): "The ISO-IRAS Faint Galaxy Spectroscopic Survey," H. E. Smith, C.J. Lonsdale, R.L. Hurt, & B. D. Siana, to be submitted to the Ap.J. [Paper4.ps] [Paper4.pdf]
Conference Proceeding (1998): "The ISO-IRAS Faint Galaxy Survey," H.E. Smith, R.L. Hurt, C.J. Lonsdale, D.A. Levine, et al. in the proceedings "The Young Universe" p.220. [Rome.ps]