Statistics and Population Studies

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Browsing by Author "Assef, R.J."

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    HerMES: The contribution to the cosmic infrared background from galaxies selected by mass and redshift
    (American Astronomical Society, 2013) Viero, M. P.; Monclesi, L.; Quadri, L.F.; Arumugam, V.; Assef, R.J.; Bethermin, M.; Bock, J.; Bridge, C.; Casey, C.M.; Conley, A.; Cooray, Asantha; Farrah, D.; Glenn, J.; Heinis, S.; Ibar, Edo; Ikarashi, S.; Ivison, R.J.; Kohno, K.; Marsden, G.; Oliver, S.J.; Roseboom, I.G.; Schulz, B.; Scott, Douglas; Serra, P.; Vaccari, M.; Vieira, J.D.; Wang, L.; Wardlow, Julie L.; Wilson, G.W.; Yun, M.S.; Zemcov, M.
    The cosmic infrared background (CIB), discovered in Far Infrared Absolute Spectrophotometer (FIRAS) data from the Cosmic Background Explorer (COBE; Puget et al. 1996; Fixsen et al. 1998), originates from thermal re-radiation of imagine cutting out hundreds of thumbnails from a map centered on the positions where galaxies are known to be, and averaging those thumbnails together until an image of the average galaxy emerges from the noise. These positional priors can come in many forms, e.g., they could be catalogs of UV, optical, IR, or radio sources. Note that the output is the average of that population in the stacked maps, i.e., there will likely be sources whose actual fluxes are higher or lower. Thus, the more homogeneous the sources comprising the input list, the more meaningful the stacked flux will be.
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    HerMES: The far-infrared emission from dust-obscured galaxies
    (American Astronomical Society, 2013) Calanog, J.A.; Wardlow, Julie L.; Fu, Hai; Cooray, Asantha; Assef, R.J.; Bock, J.; Casey, C.M.; Conley, A.; Farrah, D.; Ibar, Edo; Kartaltepe, J.; Magdis, G.; Marchetti, L.; Oliver, S.J.; Perez-Fournon, I.; Riechers, D.; Rigopoulou, D.; Roseboom, I.G.; Schulz, B.; Scott, Douglas; Symeonidis, Myrto; Vaccari, M.; Viero, M. P.; Zemcov, M.
    The far-infrared (far-IR) luminosities of luminous infrared galaxies (LIRGs) and ultra-LIRGs (ULIRGs) are dominated by reprocessed thermal dust emission, due to a combination of star formation and active galactic nucleus (AGN) activity, with star formation typically being the more dominant component (e.g., Watabe et al. 2009; Elbaz et al. 2010). Locally, these sources are rare, although out to z - 1 they become more numerous and increasingly dominate the IR luminosity function of galaxies with increasing redshift (e.g., Le Floc’h et al. 2005; P´erez-Gonz´alez et al. 2005; Caputi et al. 2007; Magnelli et al. 2009; Rodighiero et al. 2010; Eales et al. 2010). (U)LIRGs are thought to trace a phase of intense star formation activity, which is likely followed by, or partially concurrent with, an episode of vigorous black hole accretion. It is postulated that upon the cessation of these phases, each produces an early-type galaxy (Genzel et al. 2001; Farrah et al. 2003; Lonsdale et al. 2006; Veilleux et al. 2009).