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Physical Sciences and Mathematics Commons

Open Access. Powered by Scholars. Published by Universities.®

Astrophysics and Astronomy

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University of Massachusetts Amherst

2007

Cosmology : observations

Articles 1 - 3 of 3

Full-Text Articles in Physical Sciences and Mathematics

Multiwavelength Study Of Massive Galaxies At Z Similar To 2. I. Star Formation And Galaxy Growth, E Daddi, M Dickinson, G Morrison, R Chary, A Cimatti, D Elbaz, D Frayer, A Renzini, A Pope, Dm Alexander, Fe Bauer, M Giavalisco, M Huynh, J Kurk, M Mignoli Jan 2007

Multiwavelength Study Of Massive Galaxies At Z Similar To 2. I. Star Formation And Galaxy Growth, E Daddi, M Dickinson, G Morrison, R Chary, A Cimatti, D Elbaz, D Frayer, A Renzini, A Pope, Dm Alexander, Fe Bauer, M Giavalisco, M Huynh, J Kurk, M Mignoli

Astronomy Department Faculty Publication Series

No abstract provided.


The Spatial Clustering Of Mid-Ir Selected Star Forming Galaxies At Z Similar To 1 In The Goods Fields, R Gilli, E Daddi, R Chary, M Dickinson, D Elbaz, M Giavalisco, M Kitzbichler, D Stern, E Vanzella Jan 2007

The Spatial Clustering Of Mid-Ir Selected Star Forming Galaxies At Z Similar To 1 In The Goods Fields, R Gilli, E Daddi, R Chary, M Dickinson, D Elbaz, M Giavalisco, M Kitzbichler, D Stern, E Vanzella

Astronomy Department Faculty Publication Series

We present the first spatial clustering measurements of z~1, 24um-selected, star forming galaxies in the Great Observatories Origins Deep Survey (GOODS). The sample under investigation includes 495 objects in GOODS-South and 811 objects in GOODS-North selected down to flux densities of f_24>20 uJy and z_AB<23.5 mag, for which spectroscopic redshifts are available. The median redshift, IR luminosity and star formation rate (SFR) of the samples are z~0.8, L_IR~4.4 x 10^10 L_sun, and SFR~7.6 M_sun/yr, respectively. We measure the projected correlation function w(r_p) on scales of r_p=0.06-10 h^-1 Mpc, from which we derive a best fit comoving correlation length of r_0 = 4.0 +- 0.4 h^-1 Mpc and slope of gamma=1.5 +- 0.1 for the whole f_24>20uJy sample after combining the two fields. We find indications of a larger correlation length for objects of higher luminosity, with Luminous Infrared Galaxies (LIRGs, L_IR>10^11 L_sun) reaching r_0~5.1 h^-1 Mpc. This would imply that galaxies with larger SFRs are hosted in progressively more massive halos, reaching minimum halo masses of ~3 x …


Evidence For A Population Of High-Redshift Submillimeter Galaxies From Interferometric Imaging, Jd Younger, Gg Fazio, Js Huang, Min Yun, Gw Wilson, Mln Ashby, Ma Gurwell, K Lai, Ab Peck, Gr Petitpas, Dj Wilner, D Iono, K Kohno, R Kawabe, Dh Hughes, I Aretxaga, T Webb, A Martinez-Sansigre, S Kim, Ks Scott, J Austermann, T Perera, Jd Lowenthal, E Schinnerer, V Smolcic Jan 2007

Evidence For A Population Of High-Redshift Submillimeter Galaxies From Interferometric Imaging, Jd Younger, Gg Fazio, Js Huang, Min Yun, Gw Wilson, Mln Ashby, Ma Gurwell, K Lai, Ab Peck, Gr Petitpas, Dj Wilner, D Iono, K Kohno, R Kawabe, Dh Hughes, I Aretxaga, T Webb, A Martinez-Sansigre, S Kim, Ks Scott, J Austermann, T Perera, Jd Lowenthal, E Schinnerer, V Smolcic

Astronomy Department Faculty Publication Series

We have used the Submillimeter Array to image a flux-limited sample of seven submillimeter galaxies, selected by the AzTEC camera on the JCMT at 1.1 mm, in the COSMOS field at 890 μ m with ~2'' resolution. All of the sources—two radio-bright and five radio-dim—are detected as single point sources at high significance (>6 σ), with positions accurate to ~0.2'' that enable counterpart identification at other wavelengths observed with similarly high angular resolution. All seven have IRAC counterparts, but only two have secure counterparts in deep HST ACS imaging. As compared to the two radio-bright sources in the sample, …