In-flight Performance of the Advanced Camera for Surveys CCDs

Clampin, Mark; Sirianni, M.; Hartig, G.; Ford, H. C.; Illingworth, G. D.; Burmester, Bill; Koldewynd, William; Martel, A. R.; Riess, Adam G.; Schrein, Ronald J.; Sullivan, Pamela C.

doi:10.1023/b:expa.0000004358.00269.51

Cited by 4 publications

(1 citation statement)

References 6 publications

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“…We adopt the morphological measurements from the Advanced Camera for Surveys General Catalog (ACS-GC; Griffith et al 2012), a photometric and morphological database of data from the Advanced Camera for Surveys (ACS) instrument (Clampin et al 2002) on the HST. The photometric and morphological information for sources in the COSMOS field in the ACS-GC are computed with SEXTRACTER and GALFIT using the 2028s F814W images described in Koekemoer et al (2007), which have a pixel scale of ∼0.05 ′′ / pixel.…”

Section: Data and Sample Selectionmentioning

confidence: 99%

Shapes of galaxies hosting radio-loud AGNs with z ≤ 1

Zheng

Röttgering²,

Wel³

et al. 2022

A&A

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Links between the properties of radio-loud active galactic nuclei (RLAGNs) and the morphology of their hosts may provide important clues for our understanding of how RLAGNs are triggered. In this work, focusing on passive galaxies, we study the shape of the hosts of RLAGNs selected from the Karl G. Jansky Very Large Array Cosmic Evolution Survey (VLA-COSMOS) 3GHz Large Project, and compare them with previous results based on the first data release (DR1) of the LOFAR Two-Metre Sky Survey (LoTSS). We find that, at redshifts of between 0.6 and 1, high-luminosity (L 1.4 GHz 10 24 W Hz −1 ) RLAGNs have a wider range of optical projected axis ratios than their low-redshift counterparts, which are essentially all found in round galaxies with axis ratios of higher than 0.7. We construct control samples and show that although the hosts of high-redshift RLAGNs with the highest luminosities still have a rounder shape compared with the non-RLAGNs, they on average have a smaller axis ratio (more elongated) than the local RLAGNs with similar stellar masses and radio luminosities. This evolution can be interpreted as a byproduct of radio luminosity evolution, namely that galaxies at fixed stellar mass are more radio luminous at high redshifts: artificially increasing the radio luminosities of local galaxies (z ≤0.3) by a factor of 2 to 4 can remove the observed evolution of the axis ratio distribution. If this interpretation is correct then the implication is that the link between AGN radio luminosity and host galaxy shape is similar at z 1 to in the present-day Universe.

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Section: Data and Sample Selectionmentioning

confidence: 99%

Shapes of galaxies hosting radio-loud AGNs with z ≤ 1

Zheng

Röttgering²,

Wel³

et al. 2022

A&A

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Virtual realities: Is there only one advanced image display that astronomers need?

Fluke,

Walsh,

de Zoete Grundy

et al. 2025

Astronomy and Computing

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The double sub-giant branch of NGC 6656 (M 22): a chemical characterization

Marino

Milone

Sneden

et al. 2012

A&A

111

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We present an abundance analysis of 101 subgiant branch (SGB) stars in the globular cluster M 22. Using low-resolution FLAMES/GIRAFFE spectra we have determined abundances of the neutron-capture strontium and barium and the light element carbon. With these data we explore relationships between the observed SGB photometric split in this cluster and two stellar groups characterized by different contents of iron, slow neutron-capture process (s-process) elements, and the α element calcium, which we previously discovered in M 22's red-giant stars. We show that the SGB stars correlate in chemical composition and the colormagnitude diagram position. The stars with higher metallicity and relative s-process abundances define a fainter SGB, while stars with lower metallicity and s-process content reside on a relatively brighter SGB. This result has implications for the relative ages of the two stellar groups of M 22. In particular, it is inconsistent with a broad spread in ages of the two SGBs. By accounting for the chemical content of the two stellar groups, isochrone fitting of the double SGB suggests that their ages are not different by more than ∼300 Myr.

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In-flight Performance of the Advanced Camera for Surveys CCDs

Cited by 4 publications

References 6 publications

Shapes of galaxies hosting radio-loud AGNs with z ≤ 1

Shapes of galaxies hosting radio-loud AGNs with z ≤ 1

Virtual realities: Is there only one advanced image display that astronomers need?

The double sub-giant branch of NGC 6656 (M 22): a chemical characterization

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