[
    {
        "id": "thesis:17833",
        "collection": "thesis",
        "collection_id": "17833",
        "cite_using_url": "https://resolver.caltech.edu/CaltechTHESIS:01232026-210700127",
        "primary_object_url": {
            "basename": "Gatley_I_1978.pdf",
            "content": "final",
            "filesize": 17871296,
            "license": "other",
            "mime_type": "application/pdf",
            "url": "/17833/1/Gatley_I_1978.pdf",
            "version": "v2.0.0"
        },
        "type": "thesis",
        "title": "Far Infrared Observations of the Galactic Center",
        "author": [
            {
                "family_name": "Gatley",
                "given_name": "Ian",
                "orcid": "0000-0002-8742-4249",
                "clpid": "Gatley-Ian"
            }
        ],
        "thesis_advisor": [
            {
                "family_name": "Neugebauer",
                "given_name": "Gerry",
                "clpid": "Neugebauer-G"
            },
            {
                "family_name": "Becklin",
                "given_name": "Eric E.",
                "clpid": "Becklin-E-E"
            },
            {
                "family_name": "Werner",
                "given_name": "Michael W.",
                "clpid": "Werner-M-W"
            }
        ],
        "thesis_committee": [
            {
                "family_name": "Unknown",
                "given_name": "Unknown"
            }
        ],
        "local_group": [
            {
                "literal": "div_pma"
            }
        ],
        "abstract": "<p>Maps of a region 10' in diameter around the galactic center made\r\nsimultaneously in three wavelength bands at 30 \u03bcm, 50 \u03bcm, and 100 \u03bcm\r\nwith ~ 1' resolution are presented, and the distribution of far infrared\r\nluminosity and color temperature across this region is derived. The\r\nposition of highest far infrared surface brightness coincides with the\r\npeak of the late-type stellar distribution and with the H II region\r\nSgr A West. The high spatial and temperature resolution of the data is\r\nused to identify features of the far infrared maps with known sources\r\nof near infrared, radio continuum, and molecular emission. The emission\r\nmechanism and energy sources for the far infrared radiation are analyzed\r\nqualitatively, and it is concluded that all of the observed far infrared\r\nradiation from the galactic center region can be attributed to thermal\r\nemission from dust heated both by the late-type stars and by the ultraviolet\r\nsources which ionize the H II regions. A self-consistent model\r\nfor the far infrared emission from the galactic center region is presented.\r\nIt is found that the visual extinction across the central 10 pc\r\nof the Galaxy is only about 3 magnitudes, and that the dust density is\r\nfairly uniform in this region. An upper limit of 10<sup>7</sup> L<sub>\ua668</sub>\r\nis set on the luminosity of any presently unidentified source of 0.1 to 1 \u03bcm radiation\r\nat the galactic center.</p>\r\n\r\n<p>Additional maps in the vicinity of the source Sgr B2 and observations\r\nof Sgr C bring the total number of H II regions within 1\u00b0 of the\r\ngalactic center studied by the present experiment to nine. The far\r\ninfrared luminosity, color temperature and optical depth of these regions\r\nand the ratio of infrared flux to radio continuum flux lie in the range\r\ncharacteristic of spiral arm H II regions. The far infrared results\r\nare therefore consistent with the idea that the galactic center H II\r\nregions are ionized by luminous, early type stars. Steep, systematic\r\ngradients in far infrared color temperature and optical depth are seen\r\nalong the galactic plane between Sgr B2 and G0.5-0.0; the appearance\r\nof this area is similar to that of regions of star formation in the\r\nspiral arms.</p>",
        "doi": "10.7907/p847-1d03",
        "publication_date": "1978",
        "thesis_type": "phd",
        "thesis_year": "1978"
    }
]