PHYSICAL PROPERTIES OF SPECTROSCOPICALLY CONFIRMED GALAXIES AT<i>z</i>⩾ 6. II. MORPHOLOGY OF THE REST-FRAME UV CONTINUUM AND Lyα EMISSION

Jiang, Linhua; Egami, Eiichi; Fan, Xiaohui; Windhorst, Rogier A.; Cohen, Seth H.; Davé, Romeel; Finlator, Kristian; Kashikawa, Nobunari; Mechtley, Matthew; Ouchi, Masami; Shimasaku, Kazuhiro

doi:10.1088/0004-637x/773/2/153

Cited by 99 publications

(136 citation statements)

References 98 publications

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“…8) HDF 850.1 is the only known SMG in the galaxy overdensity at z = 5.2 ), suggesting a rare, transient event within this galaxy group, namely a very large starburst, characteristic of gas-rich mergers. 9) The linear sizes of the two objects in HDF 850.1 (Table 2) are about the same as the 1 to 2 kpc sizes that are measured for individual galaxies themselves at z = 5 (e.g., Oesch et al 2010;Jiang et al 2013). This also suggests that rather than parts of a large disk, they are pieces in the merger assembly of what will be a single, larger galaxy at later times.…”

Section: Conclusion: Hdf 8501 Is Similar To Other High-z Ulirg and Ssupporting

confidence: 63%

High-resolution C⁺imaging of HDF850.1 reveals a merging galaxy atz= 5.185

Neri

Downes

Cox

et al. 2014

A&A

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New high-resolution maps with the IRAM interferometer of the redshifted C + 158 μm line and the 0.98 mm dust continuum of HDF 850.1 at z = 5.185 show the source to have a blueshifted northern component and a redshifted southern component, with a projected separation of 0.3 , or 2 kpc. We interpret these components as primordial galaxies that are merging to form a larger galaxy. We think it is the resulting merger-driven starburst that makes HDF 850.1 an ultraluminous infrared galaxy, with L IR ∼ 10 13 L . The observed line and continuum brightness temperatures and the constant line-to-continuum ratio across the source imply (1) high C + line optical depth, (2) a C + excitation temperature of the same order as the dust temperature, and (3) dust continuum emission that is nearly optically thick at 158 μm. These conclusions for HDF 850.1 probably also apply to other high-redshift submillimeter galaxies and quasar hosts in which the C + 158 μm line has been detected, as indicated by their roughly constant C + -to-158 μm continuum ratios, in sharp contrast to the large dispersion in their C + -to-FIR luminosity ratios. In brightness temperature units, the C + line luminosity is about the same as the predicted CO(1-0) luminosity, implying that the C + line can also be used to estimate the molecular gas mass, with the same assumptions as for CO.

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Section: Conclusion: Hdf 8501 Is Similar To Other High-z Ulirg and Ssupporting

confidence: 63%

High-resolution C⁺imaging of HDF850.1 reveals a merging galaxy atz= 5.185

Neri

Downes

Cox

et al. 2014

A&A

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“…At z > 4, there are several α measurements reported by Curtis-Lake et al (2014); Huang et al (2013); Jiang et al (2013); Grazian et al (2012). However, these data points of α are largely scattered (the right panel of Figure 10).…”

Section: Size-luminosity Relationmentioning

confidence: 82%

MORPHOLOGIES OF ∼190,000 GALAXIES AT z = 0–10 REVEALED WITH HST LEGACY DATA. I. SIZE EVOLUTION

Shibuya

Ouchi

Harikane

2015

ApJS

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We present redshift evolution of galaxy effective radius r e obtained from the Hubble Space Telescope (HST) samples of ∼ 190, 000 galaxies at z = 0 − 10. Our HST samples consist of 176, 152 photo-z galaxies at z = 0 − 6 from the 3D-HST+CANDELS catalogue and 10, 454 Lyman break galaxies (LBGs) at z = 4 − 10 identified in CANDELS, HUDF09/12, and HFF parallel fields, providing the largest data set to date for galaxy size evolution studies. We derive r e with the same technique over the wide-redshift range of z = 0 − 10, evaluating the optical-to-UV morphological K-correction and the selection bias of photo-z galaxies+LBGs as well as the cosmological surface brightness dimming effect. We find that r e values at a given luminosity significantly decrease towards high-z, regardless of statistics choices (e.g. r e ∝ (1 + z) −1.10±0.06 for median). For star-forming galaxies, there is no evolution of the power-law slope of the size-luminosity relation and the median Sérsic index (n ∼ 1.5). Moreover, the r e -distribution is well represented by log-normal functions whose standard deviation σ ln re does not show significant evolution within the range of σ ln re ∼ 0.45 − 0.75. We calculate the stellar-to-halo size ratio from our r e measurements and the dark-matter halo masses estimated from the abundance matching study, and obtain a nearly constant value of r e /r vir = 1.0 − 3.5% at z = 0 − 8. The combination of the r e -distribution shape+standard deviation, the constant r e /r vir , and n ∼ 1.5 suggests a picture that typical high-z star-forming galaxies have disk-like stellar components in a sense of dynamics and morphology over cosmic time of z ∼ 0 − 6. If high-z star-forming galaxies are truly dominated by disks, the r e /r vir value and the disk formation model indicate that the specific angular momentum of the disk normalized by the host halo is j d /m d ≃ 0.5 − 1. These are statistical results for galaxies' major stellar components, and the detailed study of clumpy sub-components is presented in the paper II.

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“…Larger, more sensitive surveys at FIR wavelengths with ALMA would better address this question. At rest-UV wavelengths, Jiang et al (2013) found that ∼ 50% of bright z ∼ 6 galaxies show evidence for recent mergers or interactions in HST observations. However, observing such faint features in luminous quasar host galaxies would be exceedingly difficult.…”

Section: Discussionmentioning

confidence: 99%

Close Companions to Two High-Redshift Quasars

McGreer

Fan

Strauss

et al. 2014

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We report the serendipitous discoveries of companion galaxies to two high-redshift quasars. SDSS J025617.7+001904 is a z = 4.79 quasar included in our recent survey of faint quasars in the SDSS Stripe 82 region. The initial MMT slit spectroscopy shows excess Lyα emission extending well beyond the quasar's light profile. Further imaging and spectroscopy with LBT/MODS1 confirms the presence of a bright galaxy (i AB = 23.6) located 2 ′′ (12 kpc projected) from the quasar with strong Lyα emission (EW 0 ≈ 100Å) at the redshift of the quasar, as well as faint continuum. The second quasar, CFHQS J005006.6+344522 (z = 6.25), is included in our recent HST SNAP survey of z ∼ 6 quasars searching for evidence of gravitational lensing. Deep imaging with ACS and WFC3 confirms an optical dropout ∼ 4.5 mag fainter than the quasar (Y AB = 25) at a separation of 0.9 ′′ . The red i 775 − Y 105 color of the galaxy and its proximity to the quasar (5 kpc projected if at the quasar redshift) strongly favor an association with the quasar. Although it is much fainter than the quasar it is remarkably bright when compared to field galaxies at this redshift, while showing no evidence for lensing. Both systems may represent late-stage mergers of two massive galaxies, with the observed light for one dominated by powerful ongoing star formation and for the other by rapid black hole growth. Observations of close companions are rare; if major mergers are primarily responsible for high-redshift quasar fueling then the phase when progenitor galaxies can be observed as bright companions is relatively short.

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PHYSICAL PROPERTIES OF SPECTROSCOPICALLY CONFIRMED GALAXIES ATz⩾ 6. II. MORPHOLOGY OF THE REST-FRAME UV CONTINUUM AND Lyα EMISSION

Cited by 99 publications

References 98 publications

High-resolution C⁺imaging of HDF850.1 reveals a merging galaxy atz= 5.185

High-resolution C⁺imaging of HDF850.1 reveals a merging galaxy atz= 5.185

MORPHOLOGIES OF ∼190,000 GALAXIES AT z = 0–10 REVEALED WITH HST LEGACY DATA. I. SIZE EVOLUTION

Close Companions to Two High-Redshift Quasars

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PHYSICAL PROPERTIES OF SPECTROSCOPICALLY CONFIRMED GALAXIES ATz⩾ 6. II. MORPHOLOGY OF THE REST-FRAME UV CONTINUUM AND Lyα EMISSION

Cited by 99 publications

References 98 publications

High-resolution C+imaging of HDF850.1 reveals a merging galaxy atz= 5.185

High-resolution C+imaging of HDF850.1 reveals a merging galaxy atz= 5.185

MORPHOLOGIES OF ∼190,000 GALAXIES AT z = 0–10 REVEALED WITH HST LEGACY DATA. I. SIZE EVOLUTION

Close Companions to Two High-Redshift Quasars

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High-resolution C⁺imaging of HDF850.1 reveals a merging galaxy atz= 5.185

High-resolution C⁺imaging of HDF850.1 reveals a merging galaxy atz= 5.185