view Abstract Citations (30) References (12) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Infrared studies of globular clusters near the Galactic Center. Malkan, M. ; Kleinmann, D. E. ; Apt, J. Abstract Infrared photometry and raster maps have been obtained for three clusters within 6 deg of the galactic center: UKS 1751-241, Liller 1, and Terzan 2. These data support the contention that all three of these sources are globular clusters; provide estimates of the interstellar extinction to them, and allow the determination of structural properties, including core radius, central surface brightness, and core mass. Publication: The Astrophysical Journal Pub Date: April 1980 DOI: 10.1086/157886 Bibcode: 1980ApJ...237..432M Keywords: Galactic Nuclei; Globular Clusters; Infrared Astronomy; Interstellar Extinction; Milky Way Galaxy; Astronomical Maps; Astronomical Photometry; Galactic Structure; Infrared Photometry; Infrared Radiation; Astronomy full text sources ADS | data products SIMBAD (4)

view Abstract Citations (11) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Discovery of a compact far-infrared source, IR 12.4+0.5. Wright, E. L. ; Decampli, W. M. ; Fazio, G. G. ; Kleinmann, D. E. ; Lada, C. J. ; Low, F. J. Abstract Results are reported for far-IR, CO, 8-GHz, 15-GHz, H2O, and near-IR observations of a compact far-IR source (designated IR 12.4+0.5) in the M17 molecular cloud, as well as for CO and near-IR observations of a CO peak (designated MC 12.8+0.5) 24 arcmin to the NE of IR 12.4+0.5. The observed far-IR signal from IR 12.4+0.5 is found to correspond to a flux of 2400 Jy at 69 microns for a color temperature of 70 K, and the FWHM size of the source is estimated to be about 36 arcsec. The CO data for both sources and the observed reddening of background giants are shown to indicate high column densities; the existence of internal heat sources is inferred from the measured CO temperatures and the far-IR emission. It is concluded that the two sources are probably sites of very recent or ongoing star formation and that IR 12.4+0.5 is consistent with the 'cocoon star' model of early star formation. Publication: The Astrophysical Journal Pub Date: March 1979 DOI: 10.1086/156864 Bibcode: 1979ApJ...228..439W Keywords: Carbon Monoxide; Emission Spectra; Far Infrared Radiation; Infrared Spectroscopy; Interstellar Radiation; Molecular Spectra; Heat Sources; Infrared Astronomy; Infrared Telescopes; Interstellar Gas; Stellar Evolution; Stellar Models; Water Vapor; Astrophysics; Carbon Monoxide:Infrared Sources; Infrared Sources:Surveys full text sources ADS |

New 3.5-cm radio and 69-micron far-infrared maps of M17, both made with an angular resolution of about 1.5 arcmin, are presented. Each map has three distinct maxima. Two of the maxima on the far-IR map agree in position with the corresponding maxima on the radio map. However, the positions of the brightest peak in the radio and far-infrared maps, located in the SW part of M17, differ by 4.6 + or - 2.2 s in right ascension and +44 + or - 20 sec in declination, with the far-infrared peak lying between the radio peak and the dense molecular cloud southwest of the H II region. It is believed that the positional offset of the radio and far-infrared peak is physically significant. The origin of the far-infrared radiation appears to be thermal emission from dust at the interface of the ionized gas and molecular cloud. This interface region is probably heated by radiation from the H II region.

The QSO Q 0420–388 is one of many discovered by Osmer and Smith in their objective prism survey of the southern sky, and one of ∼10 now known with z>3. Its brightness and large redshift indicate a luminosity at rest wavelength 1,475 Å somewhat larger than any other measured. The source is particularly noteworthy because of the steepness of its observed visual spectrum over the range 3,600–6,800 Å, where Fν ∼ ν−2±1; this suggests that appreciably more power might be radiated in the infrared (IR). The near IR photometric observations reported here of Q 0420–388 (z = 3.12) show that it is 13.5±0.2 mag at 2.2 µm. This observation and the optical observations of Osmer and Smith1 indicate a bolometric luminosity ≥5 × 1014L⊙, for H0 = 50 km s−1 Mpc−1 and q0 = 0.1 confirming Q 0420–388 as the most luminous quasar for cosmologies with small q0.

view Abstract Citations (26) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A new, compact far-infrared source in the W31 region. Fazio, G. G. ; Lada, C. J. ; Kleinmann, D. E. ; Wright, E. L. ; Ho, P. T. P. ; Low, F. J. Abstract In a survey of the W31 region, a compact far-infrared source was detected at the position of the radio continuum source G 10.6-0.4. Associated with this infrared source and in close coincidence with its position is an H II region with a compact core and extended halo as well as OH and H2O masers. An extended molecular cloud, centered on these sources, has also been detected. The compact source and associated masers may be located at the H II region-molecular-cloud interface in a thin shocked layer of neutral gas driven into the molecular cloud by the expansion of the H II region. The compact H II region is depleted of dust and must be surrounded by a very dense shell of dust and gas (hydrogen number density in excess of 200,000 per cu cm). The source probably represents an early stage of stellar evolution. Publication: The Astrophysical Journal Pub Date: April 1978 DOI: 10.1086/182668 Bibcode: 1978ApJ...221L..77F Keywords: Far Infrared Radiation; Infrared Astronomy; Radio Sources (Astronomy); Ammonia; Carbon Monoxide; Continuous Radiation; H Ii Regions; Hydroxyl Emission; Stellar Evolution; Water Masers; Astronomy; H II Regions:Infrared Sources; Infrared Sources:Compact; Infrared Sources:Masers; Infrared Sources:Positions full text sources ADS | data products SIMBAD (1)

A far-infrared map of the M8 region at 69 microns with a 1-arcmin resolution shows an unresolved source 19 arcmin east of the main component. This source is a strong near-infrared emitter, with K = 4.8 and K - L = 2.6 mag. An intense peak in (C-12)O emission (brightness temperature about 36 K) coincides with the new infrared source. Comparison of millimeter-wave and infrared observations suggest that this source is an extremely young compact H II region. Evidence for a depletion of dust opacity inside the H II region is also found.

The Center for Astrophysics — University of Arizona 102-cm balloon-borne telescope was used to produce high resolution (l’) maps of the HII regions M17, M20, NGC 7538, and the Galactic Center. These maps will be presented and their relationship to ground-based infrared and radio observations will be discussed.

view Abstract Citations (48) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The infrared source near the rapid-burst X-ray source MXB 1730-335. Kleinmann, D. E. ; Kleinmann, S. G. ; Wright, E. L. Abstract Photometry at 1-5 microns shows that the faint optical source inferred to be a globular cluster associated with MXB 1730-335 is indeed one of the most highly concentrated globular clusters known, with a core diameter of 13 plus or minus 1 sec (0.6 pc at 10 kpc). Its central surface brightness is 0.6 mag brighter than the next brightest globular cluster, NGC 6440, which is also associated with an X-ray source. The surface brightness and core radius of the globular cluster associated with MXB 1730-335 indicate a central density of 4 x 10 to the 5th solar masses/cu pc, a central escape velocity of 60 km/s, and a relaxation time of 4 x 10 to the 7th years. Publication: The Astrophysical Journal Pub Date: December 1976 DOI: 10.1086/182309 Bibcode: 1976ApJ...210L..83K Keywords: Astronomical Photometry; Globular Clusters; Infrared Astronomy; Radiant Flux Density; X Ray Sources; Brightness; Spectral Energy Distribution; Astrophysics full text sources ADS | data products SIMBAD (3)

Properties of a balloon-borne inertially guided telescope designed to perform high-resolution mapping of far-IR sources are reviewed. Scientific results obtained to date are presented in terms of the sensitivity and angular resolution achieved. The objects observed and mapped include Orion A, W3, M43, OMC-2, NGC 7538, the infrared star IRC+10216, Uranus, and M82. Several modifications of the telescope are described which have markedly increased its IR sensitivity and its efficiency in acquiring sources.

view Abstract Citations (50) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS 8-13 Micron Spectrophotometry of NGC 1068 Kleinmann, D. E. ; Gillett, F. C. ; Wright, E. L. Abstract Spectrophotometry that provides complete coverage of the 8-l3!L spectral region of the Seyfert galaxy NGC 1068 with resolution (AA/A) 0.02 and with signal-to-noise 30 is presented. For these data, there is a wide range of models that produce fits with acceptable x2 tests; several indicative cases will be discussed. All of the models require a "silicate" absorption feature, with optical depths ranging from 0.4 to 1.2, depending on the model chosen. The 12.8 line of Ne ii is seen in emission. Subject headings: galaxies: individual - galaxies: Seyfert - infrared: spectra Publication: The Astrophysical Journal Pub Date: August 1976 DOI: 10.1086/154579 Bibcode: 1976ApJ...208...42K full text sources ADS | data products NED (1)

view Abstract Citations (24) References (20) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS G45.5+0.1 and G45.1+0.1: Compact Infrared Sources Zeilik, M., II ; Kleinmann, D. E. ; Wright, E. L. Abstract We have observed the compact H ii regions 045.5+0.1 and 045.1+0.1 from 2.2-21 . The infrared emission from 045.5+0.1 appears to come from dust that is well mixed with ionized gas and heated by La radiation. For 045.1+0.1, the infrared luminosity cannot be accounted for by La heating alone. Compared with the conventional interstellar values, the gas-to-dust ratio in 045.5+0.1 is substantially depleted, but it is close to normal in 045.1+0.1. Subject headings: infrared sources - nebulae Publication: The Astrophysical Journal Pub Date: July 1975 DOI: 10.1086/153702 Bibcode: 1975ApJ...199..401Z full text sources ADS |

view Abstract Citations (107) References (20) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Observations of M82 and NGC 253 at 8 - 13 microns. Gillett, F. C. ; Kleinmann, D. E. ; Wright, E. L. ; Capps, R. W. Abstract Observations of the 8-13 micron spectrum of the nuclear regions of M82 and NGC 253 are presented. The emission features seen in both spectra are very similar to those of the planetary nebula BD +30 deg 3639, consisting of a continuum with a strong 12.8 micron Ne(+) line and emission features around 11.3 and 8.7 microns. This similarity supports a thermal reradiation interpretation of the infrared sources in M82 and NGC 253. In addition, there is a strong, broad depression around 10 microns. The bulk of this depression can be identified with 'silicate' grain absorption of the type seen in the spectra of some heavily attenuated galactic objects. The neon abundance in M82 is at least a factor of 4 higher than normal. Publication: The Astrophysical Journal Pub Date: June 1975 DOI: 10.1086/181813 Bibcode: 1975ApJ...198L..65G Keywords: Abundance; Galactic Nuclei; Infrared Astronomy; Thermal Radiation; Emission Spectra; Galactic Radiation; Neon; Planetary Nebulae; Seyfert Galaxies; Astrophysics full text sources ADS | data products SIMBAD (4) NED (2)

view Abstract Citations (37) References (8) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A high-resolution map of the W3 region at far-infrared wavelengths. Fazio, G. G. ; Kleinmann, D. E. ; Noyes, R. W. ; Wright, E. L. ; Zeilik, M., II ; Low, F. J. Abstract The area in the vicinity of the H II region W3 is mapped at an effective wavelength of 69 microns with high angular resolution (1 min) using the 102-cm balloon-borne telescope. The main continuum source, W3, shows a partially resolved complex structure with a FWHM size of 1.8 min. The radio sources W3(OH) and G133.8 + 1.4 are also observed as well as three faint sources not associated with known radio emission. Publication: The Astrophysical Journal Pub Date: August 1975 DOI: 10.1086/181878 Bibcode: 1975ApJ...199L.177F Keywords: Astronomical Maps; Far Infrared Radiation; Infrared Astronomy; Interstellar Gas; Balloon Sounding; H Ii Regions; High Resolution; Hydrogen Ions; Nebulae; Radio Astronomy; Astronomy full text sources ADS |

view Abstract Citations (42) References (10) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A High-Resolution Map of the Orion Nebula Region at Far-Infrared Wave-Lengths Fazio, G. G. ; Kleinmann, D. E. ; Noyes, R. W. ; Wright, E. L. ; Zeilik, M., II ; Low, F. J. Abstract A high angnlar resolution (1') map of Ori A (M42) at an effective wavelength of 69 shows two components: a small (< 1') intense source at the position of the Kleinmann-Low infrared nebula and an extended emission similar to the 11-cm aperture-synthesis map of Webster and Altenhoff. Nearby sources also detected include the nebula M43 and the molecular cloud OMC-2. Subject headings: infrared sources - Orion Nebula Publication: The Astrophysical Journal Pub Date: August 1974 DOI: 10.1086/181580 Bibcode: 1974ApJ...192L..23F full text sources ADS |