Reply to Sartin et al.

Beckwith, Curt G.; Flanigan, Timothy P.; Carpenter, Charles C. J.

doi:10.1086/432812

Cited by 6 publications

(10 citation statements)

References 2 publications

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“…In addition to the public UDF data (Beckwith et al 2004;Thompson et al 2004) we use a photometric catalog consisting of ACS data (in the B 435 , V 606 , i 775 and z 850 -bands) taken as part of the GOODS survey, The size of the stamps is 3. ′′ 6 × 3.…”

Section: Selectionmentioning

confidence: 99%

“…Based on observations made with the NASA/ESA Hubble Space Telescope, which is operated by the Association of Universities for Research in Astronomy, Inc, under NASA contract NAS5-26555 2 Department of Astronomy, Yale University, New Haven, CT 06520-8101, email: toft@astro.yale.edu, dokkum@astro.yale.edu 3 Leiden Observatory, Postbus 9513, 2300 RA Leiden, Netherlands, email: franx@strw.leidenuniv.nl, mariska@strw.leidenuniv.nl 4 Steward Observatory, University of Arizona, 933 Cherry Avenue, Tucson, AZ 85721, email: thompson@cosmos.as.arizona.edu 5 University of California at Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, email: gdi@ucolick.org, bouwens@ucolick.org 6 The 10σ AB limits in the filters F435W, F606W, F775W, F850LP, F110W, F160W are 29.2, 30.0, 29.7, 28.7, 27.0, 27.0.,(Beckwith et al 2004;Thompson et al 2004) …”

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confidence: 99%

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Distant Red Galaxies in the Hubble Ultra Deep Field

Toft

Dokkum

Franx

et al. 2005

ApJ

111

138

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We take advantage of the Hubble Ultra Deep Field data to study the rest-frame optical and UV morphologies of the novel population of distant red galaxies (DRGs). Six galaxies with JϪK s 1 2.3 are found to K s p 21.5, five of which have photometric redshifts z phot տ 2, corresponding to a surface density of 0.9 arcmin Ϫ2 . The surface brightness distributions of the z phot տ 2 galaxies are better represented by exponential disks than R 1/4 laws. Two of the z phot տ 2 galaxies are extended, while three have compact morphologies. The rest-frame optical morphology of the z phot տ 2 galaxies is quite different from the rest-frame UV morphology: All the galaxies have red central components that dominate in the Near Infrared Camera and Multi-Object Spectrometer (NICMOS) H 160 -band images, as well as distinct off-center blue features that show up in (and often dominate) the Advanced Camera for Surveys (ACS) images. The mean measured effective radius of the z phot տ 2 galaxies is Ar e S p 1.9 ‫4.1ע‬ kpc, similar (within the errors) to the mean size of Lyman break galaxies at similar redshifts. All the DRGs are resolved in the ACS images, while four are resolved in the NICMOS images. Two of the z phot տ 2 galaxies are bright X-ray sources and hence host active galactic nuclei (AGNs). One of these galaxies is resolved in the ACS and NICMOS images, which means that the AGN does not dominate its rest-frame UV/optical spectral energy distribution (SED), while the other is unresolved in the NICMOS images and hence could have an AGN-dominated SED. The diverse rest-frame optical and UV morphological properties of DRGs derived here suggest that they have complex stellar populations consisting of both evolved populations, which dominate the mass and the restframe optical light, and younger populations that show up as patches of star formation in the rest-frame UV light, in many ways resembling the properties of normal local galaxies. This interpretation is supported by fits to the broadband SEDs, which for all five z phot տ 2 galaxies are best represented by models with extended star formation histories and substantial amounts of dust.

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Section: Selectionmentioning

confidence: 99%

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confidence: 99%

Distant Red Galaxies in the Hubble Ultra Deep Field

Toft

Dokkum

Franx

et al. 2005

ApJ

111

138

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“…All data used here are from the Hubble Ultra Deep Field (HUDF; Beckwith et al 2005). The individual cosmic-ray (CR) clipped images and weight maps were used with multidrizzle (Koekemoer et al 2002) to create eight sub-stacks of approximately equal exposure times.…”

Section: Observationsmentioning

confidence: 99%

“…The Hubble Ultra Deep Field (HUDF; Beckwith et al 2005) is the deepest optical image of a slice of the Universe ever observed. As such, it allows for a variety of different investigations into astrophysical objects and processes.…”

Section: Introductionmentioning

confidence: 99%

Clues to Active Galactic Nucleus Growth from Optically Variable Objects in the Hubble Ultra Deep Field

Cohen

Ryan

Straughn

et al. 2006

ApJ

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We present a photometric search for objects with point-source components that are optically variable on timescales of weeks to months in the Hubble Ultra Deep Field ( HUDF) to i 0 AB ¼ 28:0 mag. The data are split into four substacks of approximately equal exposure times. Objects exhibiting the signature of optical variability are selected by studying the photometric error distribution between the four different epochs and selecting 622 candidates as 3.0 outliers from the original catalog of 4644 objects. Of these, 45 are visually confirmed as free of contamination from close neighbors or various types of image defects. Four lie within the positional error boxes of Chandra X-ray sources, and two of these are spectroscopically confirmed AGNs. The photometric redshift distribution of the selected variable sample is compared to that of field galaxies, and we find that a constant fraction of $1% of all field objects show variability over the range of 0:1 P z P 4:5. Combined with other recent HUDF results, as well as those of recent stateof-the-art numerical simulations, we discuss a potential link between the hierarchical merging of galaxies and the growth of AGNs.

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“…The Hubble Ultra Deep Field (HUDF; Beckwith et al 2005) is the deepest optical image of a slice of the Universe ever observed. It consists of 400 orbits with the HST Advanced Camera for Surveys (ACS) observed over a period of four months in four optical bands (BV i ′ z ′ ).…”

Section: The Hubble Ultra Deep Field Datamentioning

confidence: 99%