An ALMA Survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: Identifying Candidate z ∼ 4.5 [C II] Emitters

Cooke, Elizabeth A.; Smail, Ian; Swinbank, A. M.; Stach, S. M.; An, Fang Xia; Gullberg, B.; Almaini, O.; Simpson, Chris; Wardlow, J. L.; Blain, A. W.; Chapman, Scott; Chen, Chian-Chou; Conselice, Christopher J.; Coppin, K. E. K.; Farrah, D.; Maltby, David T.; Michałowski, M. J.; Scott, Douglas; Simpson, J. M.; Thomson, A. P.; Werf, P. van der

doi:10.3847/1538-4357/aac6ba

Cited by 42 publications

(59 citation statements)

References 111 publications

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“…The deconvolved FWHM source sizes of the [C II] line emission are 1.8±0.2 and 2.6±0.5 times larger than that of the continuum for SDSS J0129-0035 and SDSS J1044-0125, respectively (based on the results from imfit, Table 1). This is consistent with the results found in previous ALMA imaging of other starburst quasar host galaxies and SMGs (Wang et al 2013;Díaz-Santos et al 2016;Venemans et al 2016Venemans et al , 2017cGullberg et al 2018;Cooke et al 2018;Rybak et al 2019). In most of these systems, the [C II] emission is found to be 1.3 to >2 times more extended than that of the dust continuum emission (Gullberg et al 2018;Cooke et al 2018).…”

Section: Surface Brightnesses and Ratios Of The Resolved [C Ii] And Dsupporting

confidence: 93%

“…• The FWHM sizes of the [C II] emission is 1.8-2.4 kpc and that of the dust continuum ∼1kpc for the two bojects, constraining the size of the intense star-forming region around the accreting SMBHs. As was found in other starburst quasar host galaxies and SMGs at high redshift, The [C II] emission regions appear to be more extended compared to that of dust continuum (Gullberg et al 2018;Cooke et al 2018).…”

Section: Discussionsupporting

confidence: 77%

“…• We derive the [C II] and FIR surface brightness and emission ratios at different radii based on the resolved [C II] and continuum images. The resolved [C II]-FIR ratios are decreasing with increasing Σ FIR toward the center, following the trend of the IR luminous star forming galaxies with Σ FIR in the same range of a few 10 10 L kpc −2 to 2×10 12 L kpc −2 Gullberg et al 2015Gullberg et al , 2018Díaz-Santos et al 2013;Lutz et al 2016;Herrea-Camus et al 2018;Cooke et al 2018;Rybak et al 2019). The low [C II]-FIR ratios of 0.0001 ∼ 0.0002 found at the peak Σ FIR in the central region of these two quasar hosts suggest dense ISM with high-intensity radiation field similar to that in the compact dusty starburst systems Herrea-Camus et al 2018;Gullberg et al 2018;Rybak et al 2019).…”

Section: Discussionmentioning

confidence: 63%

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Resolving the Interstellar Medium in the Nuclear Region of Two z = 5.78 Quasar Host Galaxies with ALMA

Wang¹,

Shao

Carilli

et al. 2019

ApJ

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We present ALMA observations of the [CII] 158 µm fine structure line and dust continuum emission from two quasars, SDSS J104433., at z=5.78. The ALMA observations at 0.2 resolution map the dust and gas on kpc scales. The spatially resolved emission shows a similar trend of decreasing [CII]-FIR ratios with increasing FIR surface brightnesses as was found in the infrared luminous galaxies with intense star formation. We confirm the velocity gradients of [CII] emission found previously in SDSS J0129-0035. No clear evidence of order motion is detected in SDSS J1044-0125. The velocity maps and PV-diagrams also suggest turbulent gas clumps in both objects. We tentatively detect a [CII] peak offset 4.9 kpc to the East of SDSS J1044-0125. This may be associated with an infalling companion, or node of gas outflow. All these results suggest significant dynamical evolution of the ISM in the nuclear region of these young quasar-starburst systems. We fit the velocity map of the [CII] emission from SDSS J0129-0035 with a rotating disk model. The result suggests a face-on system with an inclination angle of 16 ± 20 • and constrains the lower limit of the host galaxy dynamical mass to be 2.6 × 10 10 M within the [CII] emitting region. It is likely that SDSS J0129-0035, as well as other young quasars with super massive black hole masses on order of 10 7 M to 10 8 M , falls close to the black hole and host galaxy mass relation defined by local galaxies.

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Section: Surface Brightnesses and Ratios Of The Resolved [C Ii] And Dsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 77%

Section: Discussionmentioning

confidence: 63%

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Resolving the Interstellar Medium in the Nuclear Region of Two z = 5.78 Quasar Host Galaxies with ALMA

Wang¹,

Shao

Carilli

et al. 2019

ApJ

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“…An increase in the rest-frame peak wavelength of the dust SED with redshift is in broad agreement with observations of both individual sources (e.g. Hwang et al 2010;Swinbank et al 2014;Strandet et al 2016;Fudamoto et al 2017;Cooke et al 2018) and prior stacking analyses of mass-and SFR-selected galaxies (Magdis et al 2012;Viero et al 2013;Magnelli et al 2014;Béthermin et al 2015;Schreiber et al 2018a). Indeed, Schreiber et al (2018a) present a stacking analysis of the far-infrared emission from optically-selected "star-forming" sources (log 10 M > 9.5) that were identified across the 0.2 sq.…”

Section: Redshift Evolution In the Average Sedsupporting

confidence: 91%

The East Asian Observatory SCUBA-2 Survey of the COSMOS Field: Unveiling 1147 Bright Sub-millimeter Sources across 2.6 Square Degrees

Simpson

Smail

Swinbank

et al. 2019

ApJ

Self Cite

151

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We present sensitive 850 µm imaging of the COSMOS field using 640 hr of new and archival observations taken with SCUBA-2 at the East Asian Observatory's James Clerk Maxwell Telescope. The SCUBA-2 COSMOS survey (S2COSMOS) achieves a median noise level of σ 850µm = 1.2 mJy beam −1 over an area of 1.6 sq. degree (main; Hubble Space Telescope / Advanced Camera for Surveys footprint), and σ 850µm = 1.7 mJy beam −1 over an additional 1 sq. degree of supplementary (supp) coverage. We present a catalogue of 1020 and 127 sources detected at a significance level of > 4 σ and > 4.3 σ in the main and supp regions, respectively, corresponding to a uniform 2 % false-detection rate. We construct the single-dish 850 µm number counts at S 850 > 2 mJy and show that these S2COSMOS counts are in agreement with previous single-dish surveys, demonstrating that degree-scale fields are sufficient to overcome the effects of cosmic variance in the S 850 = 2-10 mJy population. To investigate the properties of the galaxies identified by S2COSMOS sources we measure the surface density of nearinfrared-selected galaxies around their positions and identify an average excess of 2.0 ± 0.2 galaxies within a 13 radius (∼ 100 kpc at z ∼ 2). The bulk of these galaxies represent near-infrared-selected SMGs and / or spatially-correlated sources and lie at a median photometric redshift of z = 2.0 ± 0.1. Finally, we perform a stacking analysis at sub-millimeter and far-infrared wavelengths of stellar-massselected galaxies (M = 10 10 -10 12 M ) from z = 0-4, obtaining high-significance detections at 850 µm in all subsets (signal-to-noise ratio, SNR = 4-30), and investigate the relation between far-infrared luminosity, stellar mass, and the peak wavelength of the dust SED. The publication of this survey adds a new deep, uniform sub-millimeter layer to the wavelength coverage of this well-studied COSMOS field.

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“…We did not include further corrections for completeness of the surveys beyond what reported in the literature works (see Miettinen et al 2017 for a caveat for the COSMOS sources). For reference, we also report two recent results from the literature, namely number densities for ultra-red galaxies selected from the Herschel Astrophysical Terahertz Large Area Survey (H -ATLAS, Ivison et al 2016) and for a subsample of spectroscopically confirmed SMGs at z ∼ 4.5 from the S2CLS survey (Cooke et al 2018), along with the number densities originally reported in Micha lowski et al (2017). Figure 6 shows that large variations are present in the observed number densities of SMGs.…”

Section: A Conservative Lower Limit From Spectroscopymentioning

confidence: 86%

Quiescent Galaxies 1.5 Billion Years after the Big Bang and Their Progenitors

Valentino

Tanaka

Davidzon

et al. 2020

ApJ

188

156

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We report two secure (z = 3.775, 4.012) and one tentative (z ≈ 3.767) spectroscopic confirmations of massive and quiescent galaxies close to their quenching epoch through K-band observations with Keck/MOSFIRE and VLT/X-Shooter. The stellar continuum emission, the absence of strong nebular emission lines and the lack of significant far-infrared detections confirm the passive nature of these objects, disfavoring the alternative solution of low-redshift dusty star-forming interlopers. We derive stellar masses of log(M /M ) ∼ 11 and ongoing star formation rates placing these galaxies 1 − 2 dex below the main sequence at their redshifts. The adopted parametrization of the star formation history suggests that these sources experienced a strong ( SFR ∼ 1200 − 3500 M yr −1 ) and short (∼ 50 Myr) burst of star formation, peaking ∼ 150 − 500 Myr before the time of observation, all properties reminiscent of the characteristics of sub-millimeter galaxies (SMGs) at z > 4. We investigate this connection by comparing the comoving number densities and the properties of these two populations. We find a fair agreement only with the deepest sub-mm surveys detecting not only the most extreme 2 Valentino et al.starbursts, but also more normal galaxies. We support these findings by further exploring the Illustris-TNG cosmological simulation, retrieving populations of both fully quenched massive galaxies at z ∼ 3 − 4 and SMGs at z ∼ 4 − 5, with number densities and properties in broad agreement with the observations at z ∼ 3, but in increasing tension at higher redshift. Nevertheless, as suggested by the observations, not all the progenitors of quiescent galaxies at these redshifts shine as bright SMGs in their past and, similarly, not all bright SMGs quench by z ∼ 3, both fractions depending on the threshold assumed to define the SMGs themselves. This cautions against the blind application of the assumption of a univocal connection between the two populations at high redshift.

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An ALMA Survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: Identifying Candidate z ∼ 4.5 [C II] Emitters

Cited by 42 publications

References 111 publications

Resolving the Interstellar Medium in the Nuclear Region of Two z = 5.78 Quasar Host Galaxies with ALMA

Resolving the Interstellar Medium in the Nuclear Region of Two z = 5.78 Quasar Host Galaxies with ALMA

The East Asian Observatory SCUBA-2 Survey of the COSMOS Field: Unveiling 1147 Bright Sub-millimeter Sources across 2.6 Square Degrees

Quiescent Galaxies 1.5 Billion Years after the Big Bang and Their Progenitors

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