English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present the results of new rest-frame far-IR observations of the z = 4.25radio galaxy, 8C1435+635, which not only confirm that it contains an enormousquantity of dust (as first inferred from its mm-wave detection by Ivison 1995)but also allow the first meaningful constraints to be placed on the mass ofthis dust and associated gas. The new measurements consist of: (i) cleardetections of sub-mm continuum emission at 450 and 850um obtained with the newsub-mm bolometer array, SCUBA, on the JCMT, (ii) continuum upper limits at 350,750 and 175um obtained with SCUBA and the PHT far-IR camera aboard ISO, and(iii) a sensitive upper limit on the CO(4-3) line flux obtained with the IRAM30-m MRT. The resulting rest-frame 33- to 238-um continuum coverage allows usto deduce that 2E8 Msun of dust at a temperature of 40 +/- 5 K is responsiblefor the observed mm/sub-mm emission. Using our CO upper limit, which constrainsM(H2)/M(dust) to <950, we go on to calculate robust limits on the total gasreserves (H2 + HI) which are thereby constrained to between 4E10 and 1.2E12Msun. The sub-mm properties of 8C1435+635 are thus strikingly similar to thoseof the z = 3.80 radio galaxy, 4C41.17, the only other high-redshift galaxydetected to date at sub-mm wavelengths whose properties appear not to beexaggerated by gravitational lensing (Dunlop et al. 1994; Hughes, Dunlop &Rawlings 1997). The inferred gas masses of both objects are sufficiently largeto suggest that the formative starbursts of massive elliptical galaxies arestill in progress at around z = 4. Observations of complete samples of radiogalaxies spanning a range of redshifts and radio luminosities will be requiredto determine if the spectacular far-IR properties of 8C1435+635 and 4C41.17 areprimarily due to their extreme redshifts or their extreme radio luminosities.Comment: 7 pages, 3 figures, LaTeX, uses emulateapj.sty (included), accepted  for Ap

Dust, Gas, and the Evolutionary Status of the Radio Galaxy 8C 1435+635 atz= 4.25