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SWIRE-SDSS FIR LLFs: Exploring FIR Local Luminosity with SDSS and SWIRE at Low Redshifts

This project in the field of astronomy focuses on SWIRE-SDSS sources with optical and FIR coverage, particularly at low redshifts (0<Z<0.25). Covering three main fields - Lockman Hole, ELAIS N1, ELAIS N2 - totaling 22.6 deg², the database includes over 7000 sources at 24 microns, 2500 at 70 microns, and 1100 at 160 microns. Spectroscopic data from SDSS, alongside photometric redshifts, provide a rich resource for studying FIR local luminosity functions. Potential extensions include analyses at higher redshifts, additional spectroscopic and Herschel observations. The SWIRE-SDSS workflow involves catalog downloads, source identification through position matching, quality control using flags, and source characterization as star or galaxy. Photometric redshifts are calculated and completeness analysis is conducted before in-depth science analysis techniques.

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SWIRE-SDSS FIR LLFs: Exploring FIR Local Luminosity with SDSS and SWIRE at Low Redshifts

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  1. SWIRE-SDSS FIR LLFs • Well-Matched SWIRE MIPS 24/70/160 micron & SDSS Optical Coverage • Particularly so at low (0<Z<0.25) redshifts • Three Fields : Lockman Hole, ELAIS N1, ELAIS N2 ~ 22.6 deg2 • Total Number of SWIRE-SDSS Sources • 24 micron > 0.5 mJy : 7,289 ( 0<Z<0.25 ) Sources • 70 micron > 15 mJy : 2,593 ( 0<Z<0.25 ) Sources • 160 micron > 75 mJy : 1,145 at ( 0<Z<0.25 ) Sources • Good Spec-Z Coverage from SDSS • SDSS Phot-Z also available based on Neural Networks • Further Miscellaneous Redshifts from NED • Overall Spec-Z % is ~25/35/55% at 24/70/160 micron and 0<Z<0.25

  2. 24 micron SWIRE-SDSS Imperial/IRAS FSC z-cat Shupe+ 98 (IRAS) Marleau+ 07 (Spitzer FLS) Rodighiero+ (sub) (Spitzer GOODS/VVDS)

  3. 70 micron SWIRE-SDSS Imperial/IRAS FSC z-cat Saunders+ ’90 (IRAS) Takeuchi+ 03 (IRAS)

  4. 160 micron SWIRE-SDSS Takeuchi+ 06 (ISO)

  5. SWIRE-SDSS FIR LLF • The homogeneity, quality, well-characterized limits as well as the sheer size of the SWIRE-SDSS database allow a relatively straighforward estimate of the FIR Local Luminosity Function down to flux levels order(s) of magnitude fainter than IRAS (albeit over a smaller area) • Ample opportunity to extend such a study • Higher redshift ( 0.25 < Z < 0.5 ) • New spectroscopic observations of complete samples • Herschel observations of same fields at 100-500 µm

  6. SWIRE-SDSS Workflow • Download Input Catalogs : SDSS (Pub) , IRSA (Pub) , IRSA (SWIRE) , SSC (Pub) , WSA (ESO),, NED (Pub) • Source Identification : based on position and flux matching, e.g. Nearest-Neighbor or Likelihood Ratio • Quality Control : based on several SWIRE & SDSS flags • Source Characterization : Star/Galaxy • Phot-z calculation following an optimized procedure (TBD skipped so far in favor of SDSS & NED phot-z) • Completeness & Reliability Analysis of all previous steps • Finally : Ad Hoc Science Analysis (e.g. 1/Vmax)

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