Browsing by Author "Walter, Fabian"

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    ALMA OBSERVATION OF 158 mu m [C II] LINE AND DUST CONTINUUM OF A Z=7 NORMALLY STAR-FORMING GALAXY IN THE EPOCH OF REIONIZATION
    (2014) Ota, Kazuaki; Walter, Fabian; Ohta, Kouji; Hatsukade, Bunyo; Carilli, Chris L.; Da Cunha, Elisabete; González López, Jorge; Decarli, Roberto; Hodge, Jacqueline A.; Nagai, Hiroshi
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    ALMA spectroscopic Survey in the Hubble Ultra Deep Field : The Infrared Excess of UV-selected z=2-10 galaxies as a function of UV-continuum Slope and Stellar Mass
    (2016) Bouwens, Rychard J.; Aravena, Manuel; Decarli, Roberto; Walter, Fabian; Cunha, Elisabete da; Labbé, Ivo; Bauer, Franz Erik; Bertoldi, Frank; Carilli, Chris; Chapman, Scott; Daddi, Emanuele; Hodge, Jacqueline; Ivison, Rob J.; Karim, Alex; Le Fevre, Olivier; Magnelli, Benjamin; Ota, Kazuaki; Riechers, Dominik; Smail, Ian R.; Werf, Paul van der; Weiss, Axel; Cox, Pierre; Elbaz, David; Gonzalez-Lopez, Jorge; Infante Lira, Leopoldo; Oesch, Pascal; Wagg, Jeff; Wilkins, Steve
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    Kiloparsec-scale Imaging of the CO(1-0)-traced Cold Molecular Gas Reservoir in a z ∼ 3.4 Submillimeter Galaxy
    (2022) Castillo, Marta Frias; Rybak, Matus; Hodge, Jacqueline; van der Werf, Paul; Riechers, Dominik A.; Vieira, Daniel; Rivera, Gabriela Calistro; Martinez-Ramirez, Laura N.; Walter, Fabian; de Blok, Erwin; Narayanan, Desika; Wagg, Jeff
    We present a high-resolution study of the cold molecular gas as traced by CO(1-0) in the unlensed z similar to 3.4 submillimeter galaxy SMM J13120+4242, using multiconfiguration observations with the Karl G. Jansky Very Large Array (JVLA). The gas reservoir, imaged on 0 ''.39 (similar to 3 kpc) scales, is resolved into two components separated by similar to 11 kpc with a total extent of 16 +/- 3 kpc. Despite the large spatial extent of the reservoir, the observations show a CO(1-0) FWHM linewidth of only 267 +/- 64 km s(-1). We derive a revised line luminosity of LCO(1-0)' = (10 +/- 3) x 10(10) K km s(-1) pc(2) and a molecular gas mass of M-gas = (13 +/- 3)x 10(10) (alpha(CO)/1) M-circle dot. Despite the presence of a velocity gradient (consistent with previous resolved CO(6-5) imaging), the CO(1-0) imaging shows evidence for significant turbulent motions that are preventing the gas from fully settling into a disk. The system likely represents a merger in an advanced stage. Although the dynamical mass is highly uncertain, we use it to place an upper limit on the CO-to-H-2 mass conversion factor a alpha(CO) of 1.4. We revisit the SED fitting, finding that this galaxy lies on the very massive end of the main sequence at z = 3.4. Based on the low gas fraction, short gas depletion time, and evidence for a central AGN, we propose that SMM J13120 is in a rapid transitional phase between a merger-driven starburst and an unobscured quasar. The case of SMM J13120 highlights how mergers may drive important physical changes in galaxies without pushing them off the main sequence.