• The Bolocam Galactic Plane Survey. VII. Characterizing The Properties Of Massive Star-Forming Regions 

      Dunham, Miranda K.; Rosolowsky, Erik; Evans, Neal J.; Cyganowski, Claudia; Urquhart, James S. (2011-11)
      We present the results of a Green Bank Telescope survey of NH(3)(1,1), (2,2), (3,3) lines toward 631 Bolocam Galactic Plane Survey (BGPS) sources at a range of Galactic longitudes in the inner Galaxy. We have detected the ...
    • The Broad-Lined Type Ic SN 2012ap And The Nature Of Relativistic Supernovae Lacking A Gamma-Ray Burst Detection 

      Milisavljevic, Dan; Margutti, R.; Parrent, Jerod T.; Soderberg, Alicia M.; Fesen, Robert A.; Mazzali, P.; Maeda, K.; Sanders, N. E.; Cenko, S. Bradley; Silverman, Jeffrey M.; Filippenko, Alexei V.; Kamble, A.; Chakraborti, S.; Drout, M. R.; Kirshner, Robert P.; Pickering, T. E.; Kawabata, K.; Hattori, T.; Hsiao, Eric Y.; Stritzinger, Maximillian D.; Marion, G. H.; Vinko, Jozsef; Wheeler, J. Craig (2015-01)
      We present ultraviolet, optical, and near-infrared observations of SN 2012ap, a broad-lined Type Ic supernova in the galaxy NGC 1729 that produced a relativistic and rapidly decelerating outflow without a gamma-ray burst ...
    • The Fast And Furious Decay Of The Peculiar Type Ic Supernova 2005Ek 

      Drout, M. R.; Soderberg, Alicia M.; Mazzali, P. A.; Parrent, Jerod T.; Margutti, R.; Milisavljevic, Dan; Sanders, N. E.; Chornock, Ryan; Foley, Ryan J.; Kirshner, Robert P.; Filippenko, Alexei V.; Li, W.; Brown, Peter J.; Cenko, S. Bradley; Chakraborti, S.; Challis, Peter; Friedman, A.; Ganeshalingam, Mohan; Hicken, M.; Jensen, C.; Modjaz, M.; Perets, H. B.; Silverman, Jeffrey M.; Wong, D. S. (2013-09)
      We present extensive multi-wavelength observations of the extremely rapidly declining Type Ic supernova (SN Ic), SN 2005ek. Reaching a peak magnitude of MR = -17.3 and decaying by similar to 3 mag in the first 15 days ...
    • Formaldehyde as a Probe of Physical Conditions in Dense Molecular Clouds 

      Mangum, Jeffrey G.; Wootten, Alwyn (1993-11)
      We present a detailed analysis describing the utility of the formaldehyde (H2CO) molecule in the derivation of the kinetic temperature and spatial density within molecular clouds. Measurements of 13 transitions from both ...
    • High-Resolution Mid-Infrared Spectroscopy Of NGC 7538 IRS 1: Probing Chemistry In A Massive Young Stellar Object 

      Knez, Claudia; Lacy, John H.; Evans, Neal J.; van Dishoeck, Ewine F.; Richter, Matthew J. (2009-05)
      We present high-resolution (R = 75,000-100,000) mid-infrared spectra of the high-mass embedded young star IRS 1 in the NGC 7538 star-forming region. Absorption lines from many rotational states of C(2)H(2), (13)C(12)CH(2), ...
    • Lick Indices In The Thin And Thick Disks Of Edge-On Disk Galaxies 

      Yoachim, Peter; Dalcanton, Julianne J. (2008-08)
      We have measured Lick index equivalent widths to derive luminosity weighted stellar ages and metallicities for thin-and thick-disk-dominated regions of nine edge-on disk galaxies with the ARC 3.5 m telescope at Apache Point ...
    • Mid-Infrared Photometry And Spectra Of Three High-Mass Protostellar Candidates At IRAS 18151-1208 And IRAS 20343+4129 

      Campbell, M. F.; Sridharan, T. K.; Beuther, H.; Lacy, John H.; Hora, J. L.; Zhu, Q.; Kassis, M.; Saito, M.; De Buizer, J. M.; Fung, S. H.; Johnson, L. C. (2008-02)
      We present arcsecond-scale mid-IR photometry ( in the 10.5 mu m N band and at 24.8 mu m), and low-resolution spectra in the N band ( R similar or equal to 100) of a candidate high-mass protostellar object ( HMPO) in IRAS ...
    • A New Z=0 Metagalactic Ultraviolet Background Limit 

      Adams, Joshua J.; Uson, Juan M.; Hill, Gary J.; MacQueen, Phillip J. (2011-02)
      We present new integral-field spectroscopy in the outskirts of two nearby, edge-on, late-type galaxies to search for the H alpha emission that is expected from the exposure of their hydrogen gas to the metagalactic ultraviolet ...
    • Physical Characteristics Of G331.5-0.1: The Luminous Central Region Of A Giant Molecular Cloud 

      Merello, Manuel; Bronfman, Leonardo; Garay, Guido; Nyman, Lars-Ake; Evans, Neal J.; Walmsley, C. Malcom (2013-09)
      We report molecular line and dust continuum observations toward the high-mass star-forming region G331.5-0.1, one of the most luminous regions of massive star formation in the Milky Way, located at the tangent region of ...
    • The Properties of Massive, Dense Clumps: Mapping Surveys of HCN and CS 

      Wu, Jingwen; Evans, Neal J., II; Shirley, Yancy L.; Knez, Claudia (2010-06)
      We have mapped over 50 massive, dense clumps with four dense gas tracers: HCN J = 1-0 and 3-2; and CS J = 2-1 and 7-6 transitions. Spectral lines of optically thin H(13)CN 3-2 and C(34)S 5-4 were also obtained toward the ...
    • Simulating Cosmic Reionization And The Radiation Backgrounds From The Epoch Of Reionization 

      Shapiro, P. R.; Iliev, I. T.; Mellema, G.; Ahn, K.; Mao, Y.; Friedrich, M.; Datta, K.; Park, H.; Komatsu, E.; Fernandez, E.; Koda, J.; Bovill, M.; Pen, U. L. (2012)
      Large-scale reionization simulations are described which combine the results of cosmological N-body simulations that model the evolving density and velocity fields and identify the galactic halo sources, with ray-tracing ...
    • Spatially Resolved Stellar, Dust, And Gas Properties Of The Post-Interacting Whirlpool Galaxy System 

      Cooper, Erin M.; Wilson, Christine D.; Foyle, Kelly; Bendo, George; Koda, Jin; Baes, Maarten; Boquien, Mederic; Boselli, Alessandro; Ciesla, Laure; Cooray, Asantha; Eales, Steve; Galametz, Maud; Lebouteiller, Vianney; Parkin, Tara; Roussel, Helene; Sauvage, Marc; Spinoglio, Luigi; Smith, Mathew W. L. (2012-08)
      Using infrared imaging from the Herschel Space Observatory, observed as part of the Very Nearby Galaxies Survey, we investigate the spatially resolved dust properties of the interacting Whirlpool galaxy system (NGC 5194 ...