{
  "id": "J/ApJ/946/L40",
  "title_cds": "Galaxies in JWST obs. of SMACS J0723.3-7327",
  "title_create": "Langeroodi+, 2023",
  "year": "2023",
  "author": "Langeroodi D., Hjorth J.",
  "title_pub": " PAH emission from star-forming galaxies in JWST mid-infrared imaging of the lensing cluster SMACS J0723.3-7327.",
  "first_author": "Langeroodi D.",
  "bibcode": [
    "2023ApJ...946L..40L"
  ],
  "ref_biblio": [
    "<Astrophys. J., 946, L40 (2023)>"
  ],
  "keyword_cds": [
    "Galaxies, photometry",
    "Colors",
    "Infrared",
    "Cross identifications",
    "Redshifts"
  ],
  "keyword_pub": "Polycyclic aromatic hydrocarbons ; Galaxy photometry ; Galaxy colors ; James Webb Space Telescope",
  "abstract": [
    "The mid-infrared spectra of star-forming galaxies (SFGs) are",
    "characterized by characteristic broad polycyclic aromatic hydrocarbon",
    "(PAH) emission features at 3-20{mu}m. As these features are",
    "redshifted, they are predicted to dominate the flux at specific",
    "mid-infrared wavelengths, leading to substantial redshift-dependent",
    "color variations in broadband photometry. The advent of JWST for the",
    "first time allows the study of this effect for normal SFGs. Based on",
    "spectral energy distribution templates, we here present tracks in mid-",
    "infrared (4.4, 7.7, 10, 15, and 18{mu}m) color-color diagrams",
    "describing the redshift dependence of SFG colors. In addition, we",
    "present simulated color-color diagrams by populating these tracks",
    "using the cosmic star formation history and the star formation rate",
    "function. Depending on redshift, we find that SFGs stand out in the",
    "color-color diagrams by several magnitudes. We provide the first",
    "observational demonstration of this effect for galaxies detected in",
    "the JWST Early Release Observations of the field toward the lensing",
    "cluster SMACS J0723.3-7327. While the distribution of detected",
    "galaxies is consistent with the simulations, the numbers are",
    "substantially boosted by lensing effects. The PAH emitter with the",
    "highest spectroscopic redshift, detected in all bands, is a multiply",
    "imaged galaxy at z=1.45. There is also a substantial number of cluster",
    "members that do not exhibit PAH emission except for one SFG at z=0.38.",
    "Future wider-field observations will further populate mid-infrared",
    "color-color diagrams and provide insight into the evolution of typical",
    "SFGs."
  ],
  "description": [
    "We analyze the JWST NIRCam and MIRI Early Release Observations of the",
    "SMACS J0723.3-7327 field (PID 2736, PI: Pontoppidan). The broadband",
    "imaging consists of six overlapping NIRCam images in the F090W, F150W,",
    "F200W, F277W, F356W, and F444W filters reaching a point-source",
    "sensitivity of AB~29.8mag and four overlapping MIRI images in the",
    "F770W, F1000W, F1500W, and F1800W filters reaching 5{sigma} depths of",
    "AB~26.3, 25.1, 24.0, and 23.0mag, respectively. For each filter, we",
    "acquire the photometry- and astrometry-calibrated data products from",
    "the Mikulski Archive for Space Telescopes (MAST).",
    "",
    "Where available, we assign spectroscopic redshifts to the detected",
    "galaxies. The SMACS J0723 field was observed under the MUSE",
    "0102.A-0718 program (Caminha+ 2022, J/A+A/666/L9), resulting in a",
    "spectroscopic redshift catalog containing 78 secure redshift",
    "measurements of Hubble Space Telescope (HST)-detected (Reionization",
    "Lensing Cluster Survey program; RELICS, Coe+ 2019, J/ApJ/884/85) sources.",
    "",
    "See Section 4."
  ],
  "object": [
    "07 23 13.29  -73 27 25.1   SMACS J0723.3-7327 = PSZ1 G284.97-23.69"
  ],
  "curator": "Prepared by [AAS], Emmanuelle Perret [CDS]",
  "history": [
    "From electronic version of the journal"
  ],
  "see_also": [
    "J/ApJ/656/770  : Mid-IR spectrum of star-forming galaxies (Smith+, 2007)",
    "J/ApJ/705/885  : PAH in galaxies at z~0.1 (O'Dowd+, 2009)",
    "J/ApJS/182/628 : Spitzer quasar and ULIRG evolution study (Veilleux+, 2009)",
    "J/ApJ/719/1191 : Mid-IR indicators of SF and AGN in galaxies (Treyer+, 2010)",
    "J/ApJ/723/895  : IR luminosities and aromatic features of 5MUSES (Wu+, 2010)",
    "J/ApJ/759/139  : Herschel + MIPS phot. of GOODS sources (Kirkpatrick+, 2012)",
    "J/ApJS/212/18  : An atlas of UV-to-MIR galaxy SEDs (Brown+, 2014)",
    "J/ApJ/790/124  : Dust and gas physics of the GOALS sample (Stierwalt+, 2014)",
    "J/A+A/617/A130 : Luminous infrared galaxies AKARI 2.5-5um data (Inami+, 2018)",
    "J/ApJ/884/85   : RELICS: Reionization Lensing Cluster Survey (Coe+, 2019)",
    "J/ApJ/884/136  : PAH features of star-forming gal. using IRS (Xie+, 2019)",
    "J/A+A/666/L9   : SMACS J0723.3-7327 first JWST observations (Caminha+, 2022)",
    "J/ApJ/946/L35  : High-z galaxies from JWST ERO (Morishita+, 2023)"
  ],
  "tables": [
    {
      "name": "table1.dat",
      "desc": "*Measured photometry of the sources plotted in Figures 2, 3, and 4"
    }
  ],
  "archive_date_creation": "10-Apr-2025",
  "catid": 19469040,
  "vizier_date_update": "02-Jun-2025",
  "xmatch": "J/ApJ/946/L40/table1",
  "doi_pub": [
    "10.3847/2041-8213/acc1e0"
  ],
  "orcid_pub": [
    "0000-0001-5710-8395"
  ],
  "doi_cds": "10.26093/cds/vizier.19469040",
  "type": [
    "OC"
  ],
  "archive_date_update": "02-Jun-2025",
  "uat": [
    "Galaxies",
    "Photometry",
    "Two-color diagrams",
    "Infrared astronomy",
    "Astronomical object identification",
    "Redshifted"
  ],
  "ip_addr": "216.73.217.50",
  "data_access": "v-f"
}