Very Large Array Radio Study of a Sample of Nearby X-Ray and Optically Bright Early-type Galaxies

Abstract Many massive early-type galaxies host central radio sources and hot X-ray atmospheres indicating the presence of radio-mechanical active galactic nucleus (AGN) feedback. The duty cycle and detailed physics of the radio-mode AGN feedback is still a matter of debate. To address these questions, we present 1–2 GHz Karl G. Jansky Very Large Array radio observations of a sample of the 42 nearest optically and X-ray brightest early-type galaxies. We detect radio emission in 41/42 galaxies. However, the galaxy without a radio source, NGC 499, has recently been detected at lower frequencies by the Low-Frequency Array. Furthermore, 27/42 galaxies in our sample host extended radio structures and 34/42 sources show environmental interactions in the form of X-ray cavities. We find a significant correlation between the radio flux density and the largest linear size of the radio emission and between the radio power and the luminosity of the central X-ray point source. The central radio spectral indices of the galaxies span a wide range of values, with the majority of the systems having steep spectra and the rest flat spectra. These results are consistent with AGN activity, where the central radio sources are mostly switched on, thus the duty cycle is very high. Seven out of 14 galaxies with pointlike radio emission (Fanaroff–Riley Class 0; FR 0) also show X-ray cavities indicating that, despite the lack of extended radio structures at 1–2 GHz, these AGNs do launch jets capable of inflating lobes and cavities.</jats:p

Deep XMM–Newton observations of the most distant SPT-SZ galaxy cluster

ABSTRACT We present results from a 577 ks XMM–Newton observation of SPT-CL J0459–4947, the most distant cluster detected in the South Pole Telescope 2500 square degree (SPT-SZ) survey, and currently the most distant cluster discovered through its Sunyaev–Zel’dovich effect. The data confirm the cluster’s high redshift, z = 1.71 ± 0.02, in agreement with earlier, less precise optical/IR photometric estimates. From the gas density profile, we estimate a characteristic mass of $M_{500}=(1.8\pm 0.2)\times 10^{14}\, {\rm M}_{\odot }$; cluster emission is detected above the background to a radius of $\sim \!2.2\, r_{500}$, or approximately the virial radius. The intracluster gas is characterized by an emission-weighted average temperature of 7.2 ± 0.3 keV and metallicity with respect to Solar of $Z/\, Z_{\odot }=0.37\pm 0.08$. For the first time at such high redshift, this deep data set provides a measurement of metallicity outside the cluster centre; at radii $r\gt 0.3\, r_{500}$, we find $Z/\, Z_{\odot }=0.33\pm 0.17$ in good agreement with precise measurements at similar radii in the most nearby clusters, supporting an early enrichment scenario in which the bulk of the cluster gas is enriched to a universal metallicity prior to cluster formation, with little to no evolution thereafter. The leverage provided by the high redshift of this cluster tightens by a factor of 2 constraints on evolving metallicity models, when combined with previous measurements at lower redshifts.</jats:p

Cosmological constraints from gas mass fractions of massive, relaxed galaxy clusters

ABSTRACT We present updated cosmological constraints from measurements of the gas mass fractions (fgas) of massive, dynamically relaxed galaxy clusters. Our new data set has greater leverage on models of dark energy, thanks to the addition of the Perseus cluster at low redshifts, two new clusters at redshifts z ≳ 1, and significantly longer observations of four clusters at 0.6 &amp;lt; z &amp;lt; 0.9. Our low-redshift (z &amp;lt; 0.16) fgas data, combined with the cosmic baryon fraction measured from the cosmic microwave background (CMB), imply a Hubble constant of h = 0.722 ± 0.067. Combining the full fgas data set with priors on the cosmic baryon density and the Hubble constant, we constrain the dark energy density to be ΩΛ = 0.865 ± 0.119 in non-flat Lambda cold dark matter (cosmological constant) models, and its equation of state to be $w=-1.13_{-0.20}^{+0.17}$ in flat, constant-w models, respectively 41 per cent and 29 per cent tighter than our previous work, and comparable to the best constraints available from other probes. Combining fgas, CMB, supernova, and baryon acoustic oscillation data, we also constrain models with global curvature and evolving dark energy. For the massive, relaxed clusters employed here, we find the scaling of fgas with mass to be consistent with a constant, with an intrinsic scatter that corresponds to just ∼3 per cent in distance.</jats:p

Megaparsec-scale structure around the protocluster core SPT2349–56 at z = 4.3

ABSTRACT We present an extensive ALMA spectroscopic follow-up programme of the $z\, {=}\, 4.3$ structure SPT2349–56, one of the most actively star-forming protocluster cores known, to identify additional members using their [C ii] 158 μm and CO(4–3) lines. In addition to robustly detecting the 14 previously published galaxies in this structure, we identify a further 15 associated galaxies at $z\, {=}\, 4.3$, resolving 55$\, {\pm }\,$5&nbsp;per cent of the 870 μm flux density at 0.5 arcsec resolution compared to 21 arcsec single-dish data. These galaxies are distributed into a central core containing 23 galaxies extending out to 300 kpc in diameter, and a northern extension, offset from the core by 400 kpc, containing three galaxies. We discovered three additional galaxies in a red Herschel-SPIRE source 1.5 Mpc from the main structure, suggesting the existence of many other sources at the same redshift as SPT2349–56 that are not yet detected in the limited coverage of our data. An analysis of the velocity distribution of the central galaxies indicates that this region may be virialized with a mass of (9$\pm 5)\, {\times }\, 10^{12}$  M⊙, while the two offset galaxy groups are about 30 and 60&nbsp;per cent less massive and show significant velocity offsets from the central group. We calculate the [C ii] and far-infrared number counts, and find evidence for a break in the [C ii] luminosity function. We estimate the average SFR density within the region of SPT2349–56 containing single-dish emission (a proper diameter of 720 kpc), assuming spherical symmetry, to be roughly 4$\, {\times }\, 10^4$ M⊙ yr−1 Mpc−3; this may be an order of magnitude greater than the most extreme examples seen in simulations

A comparison of male attendees and nonattendees at a familial cancer clinic

Purpose: This retrospective descriptive Australian study aimed to determine predictors of nonattendance at a familial cancer clinic by men from high-risk breast/ovarian cancer families. Methods: Two hundred twenty-six men from families with a known BRCA1 or BRCA2 mutation were recruited through an epidemiological database of high-risk breast cancer families and completed a self-administered questionnaire. Results: Multivariate analyses using binary logistic regression showed that nonattendance at a familial cancer clinic by men from high-risk breast/ovarian cancer families was associated with younger age (51 vs. 55 years) (odds ratio = 1.03, P = 0.04) and lower cancer burden (one relative diagnosed versus two relatives diagnosed) (odds ratio = 2.6, P = 0.04). Conclusion: Compared with men who attended a familial cancer clinic, nonattendees were younger and had fewer relatives diagnosed with breast/ovarian cancer. Unlike previous findings, cancer-specific worry, in particular avoidance was not associated with nonattendance. The number, age, and sex of biological children were not associated with attendance or nonattendance. Hence, some of the assumptions about what makes information on BRCA1 or BRCA2 status salient to men and may therefore influence their attendance at a cancer genetic clinic are not borne out in this study

Attendance of men at the familial cancer clinic: What they value from the consultation

Purpose: This study examined what men from high-risk breast/ovarian cancer families valued from attending a familial cancer clinic. Methods: One hundred men from families with a BRCA1 or BRCA2 mutation completed a self-administered questionnaire. Results: Seventy- two percent (72%) of men attended the familial cancer clinic at the request of a family member. Multivariate analyses showed that men with a preference for a collaborative decision-making style (B = -4.651, 95% CI = -9.014 to -0.289, P = 0.04), those with lower levels of education (B = -4.850, 95% CI = -9.16 to -0.537, P = 0.03), and those with higher levels of cancer-related anxiety (intrusion) (B = 0.920, 95% CI = 0.441-1.399, P \u3c 0.001) were more likely to value emotional support from the clinic. Men with a collaborative decision-making style (B = -2.68, 95% CI = -4.91 to -0.467, P = 0.02) were less likely, and those with higher total levels of cancer-related anxiety (intrusion and avoidance) (B = 0.393, 95% CI = 0.008-0.779, P = 0.04) were more likely to value receiving information from the clinic. Conclusions: A preference for collaborative decision making and cancer-related anxiety predicted men valuing information and emotional support from the consultation. The finding that men\u27s attendance is initiated by family members highlights the value men place on family responsibility