- ID:
- ivo://CDS.VizieR/J/ApJS/218/33
- Title:
- Spitzer-CANDELS catalog within 5 deep fields
- Short Name:
- J/ApJS/218/33
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Spitzer-Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (S-CANDELS; PI G.Fazio) is a Cycle 8 Exploration Program designed to detect galaxies at very high redshifts (z>5). To mitigate the effects of cosmic variance and also to take advantage of deep coextensive coverage in multiple bands by the Hubble Space Telescope (HST) Multi-cycle Treasury Program CANDELS, S-CANDELS was carried out within five widely separated extragalactic fields: the UKIDSS Ultra-deep Survey, the Extended Chandra Deep Field South, COSMOS, the HST Deep Field North, and the Extended Groth Strip. S-CANDELS builds upon the existing coverage of these fields from the Spitzer Extended Deep Survey (SEDS), a Cycle 6 Exploration Program, by increasing the integration time from SEDS' 12hr to a total of 50hr but within a smaller area, 0.16deg^2^. The additional depth significantly increases the survey completeness at faint magnitudes. This paper describes the S-CANDELS survey design, processing, and publicly available data products. We present Infrared Array Camera (IRAC) dual-band 3.6+4.5{mu}m catalogs reaching to a depth of 26.5 AB mag. Deep IRAC counts for the roughly 135000 galaxies detected by S-CANDELS are consistent with models based on known galaxy populations. The increase in depth beyond earlier Spitzer/IRAC surveys does not reveal a significant additional contribution from discrete sources to the diffuse Cosmic Infrared Background (CIB). Thus it remains true that only roughly half of the estimated CIB flux from COBE/DIRBE is resolved.
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Search Results
- ID:
- ivo://irsa.ipac/Spitzer/Catalog/SEIP/IRAC_Cov
- Title:
- Spitzer Enhanced Imaging Products IRAC Coverage Table
- Short Name:
- SEIP IRAC Cov
- Date:
- 01 Oct 2018 20:27:16
- Publisher:
- NASA/IPAC Infrared Science Archive
- Description:
- The Spitzer Science Center (SSC) and Infrared Science Archive (IRSA) have released a set of Enhanced Imaging Products from the Spitzer Heritage Archive. These include enhanced mosaic images created from multiple AORs where appropriate and a source list (SL) of photometry for compact sources. The enhanced imaging products include data from the four channels of IRAC (3-8 microns) and the 24 micron channel of MIPS. The Source List was designed to prioritize reliability over completeness. In order to make the Source List reliable, many sources were rejected. Therefore, it is not complete at any flux density. At bright flux densities, nearby galaxies may be rejected for being too extended, or for being too close to a neighboring galaxy. At faint flux densities, sources will be missing because they do not meet the signal-to-noise cut. Although the Source List is useful for many science projects, users who require high levels of completeness are encouraged to use caution. If you are interested in a source that does not appear in the Source List, you should first inspect the Coverage Table to ensure that the data exists, and then consider measuring the photometry on the Super Mosaics yourself.
- ID:
- ivo://irsa.ipac/Spitzer/Catalog/SEIP/MIPS_Cov
- Title:
- Spitzer Enhanced Imaging Products MIPS Coverage Table
- Short Name:
- SEIP MIPS Cov
- Date:
- 01 Oct 2018 20:27:16
- Publisher:
- NASA/IPAC Infrared Science Archive
- Description:
- The Spitzer Science Center (SSC) and Infrared Science Archive (IRSA) have released a set of Enhanced Imaging Products from the Spitzer Heritage Archive. These include enhanced mosaic images created from multiple AORs where appropriate and a source list (SL) of photometry for compact sources. The enhanced imaging products include data from the four channels of IRAC (3-8 microns) and the 24 micron channel of MIPS. The Source List was designed to prioritize reliability over completeness. In order to make the Source List reliable, many sources were rejected. Therefore, it is not complete at any flux density. At bright flux densities, nearby galaxies may be rejected for being too extended, or for being too close to a neighboring galaxy. At faint flux densities, sources will be missing because they do not meet the signal-to-noise cut. Although the Source List is useful for many science projects, users who require high levels of completeness are encouraged to use caution. If you are interested in a source that does not appear in the Source List, you should first inspect the Coverage Table to ensure that the data exists, and then consider measuring the photometry on the Super Mosaics yourself.
- ID:
- ivo://irsa.ipac/Spitzer/Catalog/SEIP/SourceList
- Title:
- Spitzer Enhanced Imaging Products Source List
- Short Name:
- SEIP
- Date:
- 01 Oct 2018 20:27:16
- Publisher:
- NASA/IPAC Infrared Science Archive
- Description:
- The Spitzer Science Center and IRSA have released a set of Enhanced Imaging Products (SEIP) from the Spitzer Heritage Archive. These include Super Mosaics (combining data from multiple programs where appropriate) and a Source List of photometry for compact sources. The primary requirement on the Source List is very high reliability -- with areal coverage, completeness, and limiting depth being secondary considerations. The SEIP include data from the four channels of IRAC (3.6, 4.5, 5.8, 8 microns) and the 24 micron channel of MIPS. The full set of products for the Spitzer cryogenic mission includes around 42 million sources.
- ID:
- ivo://irsa.ipac/Spitzer/Catalog/SEIP/Traceback
- Title:
- Spitzer Enhanced Imaging Products Traceback Table
- Short Name:
- SEIP Traceback
- Date:
- 01 Oct 2018 20:27:16
- Publisher:
- NASA/IPAC Infrared Science Archive
- Description:
- The Spitzer Science Center (SSC) and Infrared Science Archive (IRSA) have released a set of Enhanced Imaging Products from the Spitzer Heritage Archive. These include enhanced mosaic images created from multiple AORs where appropriate and a source list (SL) of photometry for compact sources. The enhanced imaging products include data from the four channels of IRAC (3-8 microns) and the 24 micron channel of MIPS. The Traceback Table is designed to allow users to translate between Program ID/AOR number/DCE number (information about pipeline data available from the Spitzer Heritage Archive) and Supermosaic ID/Region ID in the Spitzer Enhanced Imaging Products.
- ID:
- ivo://CDS.VizieR/J/ApJ/686/966
- Title:
- Spitzer-FLS catalog of clusters of galaxies
- Short Name:
- J/ApJ/686/966
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a catalog of 99 candidate clusters and groups of galaxies in the redshift range 0.1<z_phot_<1.3 discovered in the Spitzer First-Look Survey (FLS). The clusters are selected by their Rc-3.6um galaxy color-magnitude relation using the cluster red-sequence algorithm. Using this cluster sample, we compute the 3.6, 4.5, 5.8, and 8.0um, cluster luminosity functions (LFs).
- ID:
- ivo://CDS.VizieR/J/ApJ/769/80
- Title:
- Spitzer/IRAC observations of five deep fields
- Short Name:
- J/ApJ/769/80
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Spitzer Extended Deep Survey (SEDS) is a very deep infrared survey within five well-known extragalactic science fields: the UKIDSS Ultra-Deep Survey, the Extended Chandra Deep Field South, COSMOS, the Hubble Deep Field North, and the Extended Groth Strip. SEDS covers a total area of 1.46deg^2^ to a depth of 26 AB mag (3{sigma}) in both of the warm Infrared Array Camera (IRAC) bands at 3.6 and 4.5{mu}m. Because of its uniform depth of coverage in so many widely-separated fields, SEDS is subject to roughly 25% smaller errors due to cosmic variance than a single-field survey of the same size. SEDS was designed to detect and characterize galaxies from intermediate to high redshifts (z=2-7) with a built-in means of assessing the impact of cosmic variance on the individual fields. Because the full SEDS depth was accumulated in at least three separate visits to each field, typically with six-month intervals between visits, SEDS also furnishes an opportunity to assess the infrared variability of faint objects. This paper describes the SEDS survey design, processing, and publicly-available data products. Deep IRAC counts for the more than 300000 galaxies detected by SEDS are consistent with models based on known galaxy populations. Discrete IRAC sources contribute 5.6+/-1.0 and 4.4+/-0.8nW/m2/sr at 3.6 and 4.5{mu}m to the diffuse cosmic infrared background (CIB). IRAC sources cannot contribute more than half of the total CIB flux estimated from DIRBE data. Barring an unexpected error in the DIRBE flux estimates, half the CIB flux must therefore come from a diffuse component.
- ID:
- ivo://CDS.VizieR/II/295
- Title:
- Spitzer IRAC survey of the galactic center
- Short Name:
- II/295
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have obtained Spitzer IRAC observations of the central 2.0{deg}x1.4{deg} (~280x200pc) of the Galaxy at 3.6-8.0um. A point-source catalog of 1065565 objects is presented. The catalog includes magnitudes for the point sources at 3.6, 4.5, 5.8, and 8.0um, as well as JHKs photometry from Two Micron All Sky Survey (2MASS). The point-source catalog is confusion limited with average limits of 12.4, 12.1, 11.7, and 11.2mag for [3.6], [4.5], [5.8], and [8.0], respectively. We find that the confusion limits are spatially variable because of stellar surface density, background surface brightness level, and extinction variations across the survey region. The overall distribution of point-source density with Galactic latitude and longitude is essentially constant, but structure does appear when sources of different magnitude ranges are selected. Bright stars show a steep decreasing gradient with Galactic latitude and a slow decreasing gradient with Galactic longitude, with a peak at the position of the Galactic center. From IRAC color-magnitude and color-color diagrams, we conclude that most of the point sources in our catalog have IRAC magnitudes and colors characteristic of red giant and asymptotic giant branch (AGB) stars.
- ID:
- ivo://CDS.VizieR/J/ApJ/817/119
- Title:
- Spitzer/IRAC variability survey of Bootes field
- Short Name:
- J/ApJ/817/119
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Decadal IRAC Bootes Survey is a mid-IR variability survey of the ~9deg^2^ of the NDWFS Bootes Field and extends the time baseline of its predecessor, the Spitzer Deep, Wide-Field Survey (SDWFS), from 4 to 10 years. The Spitzer Space Telescope visited the field five times between 2004 and 2014 at 3.6 and 4.5{mu}m. We provide the difference image analysis photometry for a half a million mostly extragalactic sources. In mid-IR color-color plane, sources with quasar colors constitute the largest variability class (75%), 16% of the variable objects have stellar colors and the remaining 9% have the colors of galaxies. Adding the fifth epoch doubles the number of variable active galactic nuclei (AGNs) for the same false positive rates as in SDWFS, or increases the number of sources by 20% while decreasing the false positive rates by factors of 2-3 for the same variability amplitude. We quantify the ensemble mid-IR variability of ~1500 spectroscopically confirmed AGNs using single power-law structure functions (SFs), which we find to be steeper (index {gamma}~0.45) than in the optical ({gamma}~0.3), leading to much lower amplitudes at short time-lags. This provides evidence for large emission regions, smoothing out any fast UV/optical variations, as the origin of infrared quasar variability. The mid-IR AGN SF slope {gamma} seems to be uncorrelated with both the luminosity and rest-frame wavelength, while the amplitude shows an anti-correlation with the luminosity and a correlation with the rest-frame wavelength.
- ID:
- ivo://CDS.VizieR/J/ApJ/826/44
- Title:
- Spitzer/IRS obs. of Magellanic carbon stars
- Short Name:
- J/ApJ/826/44
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Infrared Spectrograph on the Spitzer Space Telescope observed 184 carbon stars in the Magellanic Clouds. This sample reveals that the dust-production rate (DPR) from carbon stars generally increases with the pulsation period of the star. The composition of the dust grains follows two condensation sequences, with more SiC condensing before amorphous carbon in metal-rich stars, and the order reversed in metal-poor stars. MgS dust condenses in optically thicker dust shells, and its condensation is delayed in more metal-poor stars. Metal-poor carbon stars also tend to have stronger absorption from C_2_H_2_ at 7.5{mu}m. The relation between DPR and pulsation period shows significant apparent scatter, which results from the initial mass of the star, with more massive stars occupying a sequence parallel to lower-mass stars, but shifted to longer periods. Accounting for differences in the mass distribution between the carbon stars observed in the Small and Large Magellanic Clouds reveals a hint of a subtle decrease in the DPR at lower metallicities, but it is not statistically significant. The most deeply embedded carbon stars have lower variability amplitudes and show SiC in absorption. In some cases they have bluer colors at shorter wavelengths, suggesting that the central star is becoming visible. These deeply embedded stars may be evolving off of the asymptotic giant branch and/or they may have non-spherical dust geometries.
