76 results on '"Haines, Chris P."'
Search Results
2. LoCuSS: The splashback radius of massive galaxy clusters and its dependence on cluster merger history
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Bianconi, Matteo, Buscicchio, Riccardo, Smith, Graham P., McGee, Sean L., Haines, Chris P., Finoguenov, Alexis, and Babul, Arif
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We present the direct detection of the splashback feature using the sample of massive galaxy clusters from the Local Cluster Substructure Survey (LoCuSS). This feature is clearly detected (above $5\sigma$) in the stacked luminosity density profile obtained using the K-band magnitudes of spectroscopically confirmed cluster members. We obtained the best-fit model by means of Bayesian inference, which ranked models including the splashback feature as more descriptive of the data with respect to models that do not allow for this transition. In addition, we have assessed the impact of the cluster dynamical state on the occurrence of the splashback feature. We exploited the extensive multi-wavelength LoCuSS dataset to test a wide range of proxies for the cluster formation history, finding the most significant dependence of the splashback feature location and scale according to the presence or absence of X-ray emitting galaxy groups in the cluster infall regions. In particular, we report for the first time that clusters that do not show massive infalling groups present the splashback feature at a smaller clustercentric radius $ r_{\rm{sp}}/r_{\rm{200,m}} = 1.158 \pm 0.071$ than clusters that are actively accreting groups $r_{\rm{sp}}/r_{\rm{200,m}} = 1.291 \pm 0.062$. The difference between these two sub-samples is significant at $4.2\sigma$, suggesting a correlation between the properties of the cluster potential and its accretion rate and merger history. Similarly, clusters that are classified as old and dynamically inactive present stronger signatures of the splashback feature, with respect to younger, more active clusters. We are directly observing how fundamental dynamical properties of clusters reverberate across vastly different physical scales., Comment: 18 pages, 8 figures, 4 tables. Re-submission to ApJ after the first round of comments. Minor text modifications to improve clarity, and updated reference list
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- 2020
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3. LoCuSS: exploring the connection between local environment, star formation and dust mass in Abell 1758
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Bianconi, Matteo, Smith, Graham P., Haines, Chris P., McGee, Sean L., Finoguenov, Alexis, and Egami, Eiichi
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Astrophysics - Astrophysics of Galaxies - Abstract
We explore the connection between dust and star formation, in the context of environmental effects on galaxy evolution. In particular, we exploit the susceptibility of dust to external processes to assess the influence of dense environment on star-forming galaxies. We have selected cluster Abell 1758 from the Local Cluster Substructure Survey (LoCuSS). Its complex dynamical state is an ideal test-bench to track dust removal and destruction in galaxies due to merger and accretion shocks. We present a systematic panchromatic study (from 0.15 $\rm \mu$m with GALEX to 500 $\rm \mu$m with Herschel) of spectroscopically confirmed star-forming cluster galaxies at intermediate redshift. We observe that the main subclusters (A1758N and A1758S) belong to two separate large-scale structures, with no overlapping galaxy members. Star-forming cluster members are distributed preferentially outside cluster central regions, and are not grouped in substructures. Rather, these galaxies are being funneled towards the main subclusters along separate accretion filaments. Additionally, we present the first study of dust-to-stellar (DTS) mass ratio used as indicator for local environmental influence on galaxy evolution. Star-forming cluster members show lower mean values (32% at 2.4$\rm \sigma$) of DTS mass ratio and lower levels of infrared emission from birth clouds with respect to coeval star-forming field galaxies. This picture is consistent with the majority of star-forming cluster members infalling in isolation. Upon accretion, star-formation is observed to decrease and warm dust is destroyed due to heating from the intracluster medium radiation, ram-pressure stripping and merger shocks., Comment: 16 pages, 11 figures. Accepted for publication in MNRAS
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- 2020
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4. Forming one of the most massive objects in the Universe: The quadruple merger in Abell 1758
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Schellenberger, Gerrit, David, Laurence P., O'Sullivan, Ewan, Vrtilek, Jan M., and Haines, Chris P.
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
Abell1758 is a system of two galaxy clusters, a more massive, northern cluster and a southern cluster. Both parts are undergoing major merger events at different stages. Although the mass of the merger constituents provides enough energy to produce visible shock fronts in the X-ray, none have been found to date. We present detailed temperature and abundance maps based on Chandra ACIS data, and identify several candidates for shocks and cold fronts from a smoothed gradient map of the surface brightness. One candidate can be confirmed as the missing shock front in the northern cluster through X-ray spectroscopy. Non-thermal radio emission observed with the GMRT confirms the presence of radio halos in the northern and southern clusters, and shows evidence for a relic in the periphery of the southern cluster. We do not find evidence for shocked gas between A1758N and A1758S., Comment: accepted by ApJ, 24 pages, 16 figures
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- 2019
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5. Detection of anti-correlation of hot and cold baryons in galaxy clusters
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Farahi, Arya, Mulroy, Sarah L., Evrard, August E., Smith, Graham P., Finoguenov, Alexis, Bourdin, Herve, Carlstrom, John E., Haines, Chris P., Marrone, Daniel P., Martino, Rossella, Mazzotta, Pasquale, O'Donnell, Christine, and Okabe, Nobuhiro
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Astrophysics - Cosmology and Nongalactic Astrophysics ,Astrophysics - Astrophysics of Galaxies - Abstract
The largest clusters of galaxies in the Universe contain vast amounts of dark matter, plus baryonic matter in two principal phases, a majority hot gas component and a minority cold stellar phase comprising stars, compact objects, and low-temperature gas. Hydrodynamic simulations indicate that the highest-mass systems retain the cosmic fraction of baryons, a natural consequence of which is anti-correlation between the masses of hot gas and stars within dark matter halos of fixed total mass. We report observational detection of this anti-correlation based on 4 elements of a $9\times9$ element covariance matrix for nine cluster properties, measured from X-ray, optical, infrared and millimetre wavelength observations of 41 clusters from the Local Cluster Substructure Survey. These clusters were selected using explicit and quantitative selection rules that were then encoded in our hierarchical Bayesian model. Our detection of anti-correlation is consistent with predictions from contemporary hydrodynamic cosmological simulations that were not tuned to reproduce this signal., Comment: Published in the 2 July issue of Nature Communications. For published version, see https://rdcu.be/bICJG . The full posterior chains is available at https://doi.org/10.6084/m9.figshare.8001218
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- 2019
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6. LoCuSS: Scaling relations between galaxy cluster mass, gas, and stellar content
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Mulroy, Sarah L., Farahi, Arya, Evrard, August E., Smith, Graham P., Finoguenov, Alexis, O'Donnell, Christine, Marrone, Daniel P., Abdulla, Zubair, Bourdin, Hervé, Carlstrom, John E., Démoclès, Jessica, Haines, Chris P., Martino, Rossella, Mazzotta, Pasquale, McGee, Sean L., and Okabe, Nobuhiro
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Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We present a simultaneous analysis of galaxy cluster scaling relations between weak-lensing mass and multiple cluster observables, across a wide range of wavelengths, that probe both gas and stellar content. Our new hierarchical Bayesian model simultaneously considers the selection variable alongside all other observables in order to explicitly model intrinsic property covariance and account for selection effects. We apply this method to a sample of 41 clusters at $0.15
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- 2019
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7. An interacting galaxy pair at the origin of a light echo
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Merluzzi, Paola, Busarello, Giovanni, Dopita, Michael A., Thomas, Adam D., Haines, Chris P., Grado, Aniello, Limatola, Luca, and Mercurio, Amata
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Astrophysics - Astrophysics of Galaxies - Abstract
In a low-density region of the Shapley supercluster we identified an interacting galaxy pair at redshift z=0.04865 in which the Seyfert-2 nucleus of the main galaxy (ShaSS 073) is exciting an extended emission line region (EELR, ~170 kpc^2) in the disk of the less massive companion (ShaSS 622). New integral-field spectroscopy and the multi-band data-set, spanning from far-ultraviolet to far-infrared and radio wavelengths, allowed us to obtain a detailed description of the ShaSS 622-073 system. The gas kinematics shows hints of interaction, although the overall velocity field shows a quite regular rotation in both galaxies, thus suggesting that we are observing their first encounter as confirmed by the estimated distance of 21 kpc between the two galaxy centers. The detected ~2-3 kpc AGN outflow and the geometry of the EELR in ShaSS 622 support the presence of a hollow bicone structure. The status and sources of the ionization across the whole system have been analysed through photoionization models and a Bayesian approach which prove a clear connection between the AGN and the EELR. The luminosity of the AGN (2.4x10^44 erg/s) is a factor 20 lower than the power needed to excite the gas in the EELR (4.6x10^45 erg/s) indicating a dramatic fading of the AGN in the last 3x10^4 yr. ShaSS 073-622 provides all the ingredients listed in the recipe of a light echo where a highly ionised region maintains memory of a preceding more energetic phase of a now faded AGN. This is the first case of a light echo observed between two galaxies., Comment: 28 pages, 23 figures. In press on the Astrophysical Journal
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- 2018
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8. LoCuSS: Pre-processing in galaxy groups falling into massive galaxy clusters at z=0.2
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Bianconi, Matteo, Smith, Graham P., Haines, Chris P., McGee, Sean L., Finoguenov, Alexis, and Egami, Eiichi
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Astrophysics - Astrophysics of Galaxies - Abstract
We report direct evidence of pre-processing of the galaxies residing in galaxy groups falling into galaxy clusters drawn from the Local Cluster Substructure Survey (LoCuSS). 34 groups have been identified via their X-ray emission in the infall regions of 23 massive ($\rm \langle M_{200}\rangle = 10^{15}\,M_{\odot}$) clusters at $0.15
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- 2017
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9. Galaxy cluster luminosities and colours, and their dependence on cluster mass and merger state
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Mulroy, Sarah L., McGee, Sean L., Gillman, Steven, Smith, Graham P., Haines, Chris P., Democles, Jessica, Okabe, Nobuhiro, and Egami, Eiichi
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Astrophysics - Cosmology and Nongalactic Astrophysics ,Astrophysics - Astrophysics of Galaxies - Abstract
We study a sample of 19 galaxy clusters in the redshift range $0.15
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- 2017
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10. BUDHIES III: The fate of HI and the quenching of galaxies in evolving environments
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Jaffé, Yara L., Verheijen, Marc A. W., Haines, Chris P., Yoon, Hyein, Cybulski, Ryan, Montero-Castaño, María, Smith, Rory, Chung, Aeree, Deshev, Boris Z., Fernández, Ximena, van Gorkom, Jacqueline, Poggianti, Bianca M., Yun, Min S., Finoguenov, Alexis, Smith, Graham P., and Okabe, Nobuhiro
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
In a hierarchical Universe clusters grow via the accretion of galaxies from the field, groups and even other clusters. As this happens, galaxies can lose their gas reservoirs via different mechanisms, eventually quenching their star-formation. We explore the diverse environmental histories of galaxies through a multi-wavelength study of the combined effect of ram-pressure stripping and group "processing" in Abell 963, a massive growing cluster at $z=0.2$ from the Blind Ultra Deep HI Environmental Survey (BUDHIES). We incorporate hundreds of new optical redshifts (giving a total of 566 cluster members), as well as Subaru and XMM-Newton data from LoCuSS, to identify substructures and evaluate galaxy morphology, star-formation activity, and HI content (via HI deficiencies and stacking) out to $3\times R_{200}$. We find that Abell 963 is being fed by at least 7 groups, that contribute to the large number of passive galaxies outside the cluster core. More massive groups have a higher fraction of passive and HI-poor galaxies, while low-mass groups host younger (often interacting) galaxies. For cluster galaxies not associated with groups we corroborate our previous finding that HI gas (if any) is significantly stripped via ram-pressure during their first passage through the intra-cluster medium, and find mild evidence for a starburst associated with this event. In addition, we find an overabundance of morphologically peculiar and/or star-forming galaxies near the cluster core. We speculate that these arise as groups pass through the cluster (post-processing). Our study highlights the importance of environmental quenching and the complexity added by evolving environments., Comment: 21 pages and 21 figures (including appendix). Accepted for publication in MNRAS. v2: minor changes to match published version
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- 2016
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11. Early Science with the Large Millimeter Telescope: COOL BUDHIES I - a pilot study of molecular and atomic gas at z~0.2
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Cybulski, Ryan, Yun, Min S., Erickson, Neal, De la Luz, Victor, Narayanan, Gopal, Montaña, Alfredo, Sánchez-Argülles, David, Zavala, Jorge A., Zeballos, Milagros, Chung, Aeree, Fernández, Ximena, van Gorkom, Jacqueline, Haines, Chris P., Jaffé, Yara L., Montero-Castaño, María, Poggianti, Bianca M., Verheijen, Marc A. W., Yoon, Hyein, Harrington, Kevin, Hughes, David H., Morrison, Glenn E., Schloerb, F. Peter, and Velazquez, Miguel
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Astrophysics - Astrophysics of Galaxies - Abstract
An understanding of the mass build-up in galaxies over time necessitates tracing the evolution of cold gas (molecular and atomic) in galaxies. To that end, we have conducted a pilot study called CO Observations with the LMT of the Blind Ultra-Deep H I Environment Survey (COOL BUDHIES). We have observed 23 galaxies in and around the two clusters Abell 2192 (z = 0.188) and Abell 963 (z = 0.206), where 12 are cluster members and 11 are slightly in the foreground or background, using about 28 total hours on the Redshift Search Receiver (RSR) on the Large Millimeter Telescope (LMT) to measure the $^{12}$CO J = 1 --> 0 emission line and obtain molecular gas masses. These new observations provide a unique opportunity to probe both the molecular and atomic components of galaxies as a function of environment beyond the local Universe. For our sample of 23 galaxies, nine have reliable detections (S/N$\geq$3.6) of the $^{12}$CO line, and another six have marginal detections (2.0 < S/N < 3.6). For the remaining eight targets we can place upper limits on molecular gas masses roughly between $10^9$ and $10^{10} M_\odot$. Comparing our results to other studies of molecular gas, we find that our sample is significantly more abundant in molecular gas overall, when compared to the stellar and the atomic gas component, and our median molecular gas fraction lies about $1\sigma$ above the upper limits of proposed redshift evolution in earlier studies. We discuss possible reasons for this discrepancy, with the most likely conclusion being target selection and Eddington bias., Comment: MNRAS, submitted
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- 2015
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12. LoCuSS: Exploring the selection of faint blue background galaxies for cluster weak-lensing
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Ziparo, Felicia, Smith, Graham P., Okabe, Nobuhiro, Haines, Chris P., Pereira, Maria J., and Egami, Eiichi
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
Cosmological constraints from galaxy clusters rely on accurate measurements of the mass and internal structure of clusters. An important source of systematic uncertainty in cluster mass and structure measurements is the secure selection of background galaxies that are gravitationally lensed by clusters. This issue has been shown to be particular severe for faint blue galaxies. We therefore explore the selection of faint blue background galaxies, by reference to photometric redshift catalogs derived from the COSMOS survey and our own observations of massive galaxy clusters at z~0.2. We show that methods relying on photometric redshifts of galaxies in/behind clusters based on observations through five filters, and on deep 30-band COSMOS photometric redshifts are both inadequate to identify safely faint blue background galaxies. This is due to the small number of filters used by the former, and absence of massive galaxy clusters at redshifts of interest in the latter. We therefore develop a pragmatic method to combine both sets of photometric redshifts to select a population of blue galaxies based purely on photometric analysis. This sample yields stacked weak-lensing results consistent with our previously published results based on red galaxies. We also show that the stacked clustercentric number density profile of these faint blue galaxies is consistent with expectations from consideration of the lens magnification signal of the clusters. Indeed, the observed number density of blue background galaxies changes by ~10-30 per cent across the radial range over which other surveys assume it to be flat., Comment: submitted to MNRAS
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- 2015
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13. GLACE survey: OSIRIS/GTC Tuneable Filter H$\alpha$ imaging of the rich galaxy cluster ZwCl 0024.0+1652 at z = 0.395. Part I -- Survey presentation, TF data reduction techniques and catalogue
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Sánchez-Portal, Miguel, Pintos-Castro, Irene, Pérez-Martínez, Ricardo, Cepa, Jordi, García, Ana M. Pérez, Domínguez-Sánchez, Helena, Bongiovanni, Ángel, Serra, Ana L., Alfaro, Emilio, Altieri, Bruno, Aragón-Salamanca, Alfonso, Balkowski, Chantal, Biviano, Andrea, Bremer, Malcom, Castander, Francisco, Castañeda, Héctor, Castro-Rodríguez, Nieves, Chies-Santos, Ana L., Coia, Daniela, Diaferio, Antonaldo, Duc, Pierre-Alain, Ederoclite, Alessandro, Geach, James, González-Serrano, Ignacio, Haines, Chris. P., McBreen, Brian, Metcalfe, Leo, Oteo, Iván, Pérez-Fournón, Ismael, Poggianti, Bianca, Polednikova, Jana, Ramón-Pérez, Marina, Rodríguez-Espinosa, José M., Santos, Joana S., Smail, Ian, Smith, Graham P., Temporin, Sonia, and Valtchanov, Ivan
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
The cores of clusters at 0 $\lesssim$ z $\lesssim$ 1 are dominated by quiescent early-type galaxies, whereas the field is dominated by star-forming late-type ones. Galaxy properties, notably the star formation (SF) ability, are altered as they fall into overdense regions. The critical issues to understand this evolution are how the truncation of SF is connected to the morphological transformation and the responsible physical mechanism. The GaLAxy Cluster Evolution Survey (GLACE) is conducting a study on the variation of galaxy properties (SF, AGN, morphology) as a function of environment in a representative sample of clusters. A deep survey of emission line galaxies (ELG) is being performed, mapping a set of optical lines ([OII], [OIII], H$\beta$ and H$\alpha$/[NII]) in several clusters at z $\sim$ 0.40, 0.63 and 0.86. Using the Tunable Filters (TF) of OSIRIS/GTC, GLACE applies the technique of TF tomography: for each line, a set of images at different wavelengths are taken through the TF, to cover a rest frame velocity range of several thousands km/s. The first GLACE results target the H$\alpha$/[NII] lines in the cluster ZwCl 0024.0+1652 at z = 0.395 covering $\sim$ 2 $\times$ r$_{vir}$. We discuss the techniques devised to process the TF tomography observations to generate the catalogue of H$\alpha$ emitters of 174 unique cluster sources down to a SFR below 1 M$_{\odot}$/yr. The AGN population is discriminated using different diagnostics and found to be $\sim$ 37% of the ELG population. The median SFR is 1.4 M$_{\odot}$/yr. We have studied the spatial distribution of ELG, confirming the existence of two components in the redshift space. Finally, we have exploited the outstanding spectral resolution of the TF to estimate the cluster mass from ELG dynamics, finding M$_{200}$ = 4.1 $\times$ 10$^{14}$ M$_{\odot} h^{-1}$, in agreement with previous weak-lensing estimates., Comment: 23 pages, 13 figures, accepted for publication in A&A. Astro-ph abstract abridged
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- 2015
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14. LoCuSS: The Near-Infrared Luminosity and Weak-Lensing Mass Scaling Relation of Galaxy Clusters
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Mulroy, Sarah L., Smith, Graham P., Haines, Chris P., Marrone, Daniel P., Okabe, Nobuhiro, Pereira, Maria J., Egami, Eiichi, Babul, Arif, Finoguenov, Alexis, and Martino, Rossella
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Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We present the first scaling relation between weak-lensing galaxy cluster mass, $M_{WL}$, and near-infrared luminosity, $L_K$. Our results are based on 17 clusters observed with wide-field instruments on Subaru, the United Kingdom Infrared Telescope, the Mayall Telescope, and the MMT. We concentrate on the relation between projected 2D weak-lensing mass and spectroscopically confirmed luminosity within 1Mpc, modelled as $M_{WL} \propto L_{K}^b$, obtaining a power law slope of $b=0.83^{+0.27}_{-0.24}$ and an intrinsic scatter of $\sigma_{lnM_{WL}|L_{K}}=10^{+8}_{-5}\%$. Intrinsic scatter of ~10% is a consistent feature of our results regardless of how we modify our approach to measuring the relationship between mass and light. For example, deprojecting the mass and measuring both quantities within $r_{500}$, that is itself obtained from the lensing analysis, yields $\sigma_{lnM_{WL}|L_{K}}=10^{+7}_{-5}\%$ and $b=0.97^{+0.17}_{-0.17}$. We also find that selecting members based on their (J-K) colours instead of spectroscopic redshifts neither increases the scatter nor modifies the slope. Overall our results indicate that near-infrared luminosity measured on scales comparable with $r_{500}$ (typically 1Mpc for our sample) is a low scatter and relatively inexpensive proxy for weak-lensing mass. Near-infrared luminosity may therefore be a useful mass proxy for cluster cosmology experiments., Comment: 9 Pages, 5 Figures, 3 Tables. Submitted to MNRAS
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- 2014
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15. The evolution of dwarf galaxies in the Coma supercluster
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Mahajan, Smriti, Haines, Chris P., and Raychaudhury, Somak
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Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We employ spectroscopic and photometric data from SDSS DR7, in a 500 sq degree region, to understand the evolution of dwarf (~M*+2
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- 2010
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16. ACCESS III: The Nature of Star Formation in the Shapley Supercluster
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Haines, Chris P., Busarello, Gianni, Merluzzi, Paola, Smith, Russell J., Raychaudhury, Somak, Mercurio, Amata, and Smith, Graham P.
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Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We present a joint analysis of panoramic Spitzer/MIPS mid-infrared and GALEX ultraviolet imaging of the Shapley supercluster at z=0.048. Combining this with spectra of 814 supercluster members and 1.4GHz radio continuum maps, this represents the largest complete census of star-formation (both obscured and unobscured) in local cluster galaxies to date, reaching SFRs~0.02Msun/yr. We take advantage of this comprehensive panchromatic dataset to perform a detailed analysis of the nature of star formation in cluster galaxies, using several quite independent diagnostics of the quantity and intensity of star formation to develop a coherent view of the types of star formation within cluster galaxies. We observe a robust bimodality in the infrared (f_24/f_K) galaxy colours, which we are able to identify as another manifestation of the broad split into star-forming spiral and passive elliptical galaxy populations seen in UV-optical surveys. This diagnostic also allows the identification of galaxies in the process of having their star formation quenched as the infrared analogue to the UV "green valley" population. The bulk of supercluster galaxies on the star-forming sequence have specific-SFRs consistent with local field specific-SFR-M* relations, and form a tight FIR-radio correlation confirming that their FIR emission is due to star formation. We show that 85% of the global SFR is quiescent star formation within spiral disks, as manifest by the observed sequence in the IRX-beta relation being significantly offset from the starburst relation of Kong et al. (2004), while their FIR-radio colours indicate dust heated by low-intensity star formation. Just 15% of the global SFR is due to nuclear starbursts. The vast majority of star formation seen in cluster galaxies comes from normal infalling spirals who have yet to be affected by the cluster environment., Comment: 17 pages, 9 figures. Accepted for publication in MNRAS
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- 2010
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17. ACCESS II: A Complete Census of Star Formation in the Shapley Supercluster - UV and IR Luminosity Functions
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Haines, Chris P., Busarello, Gianni, Merluzzi, Paola, Smith, Russell J., Raychaudhury, Somak, Mercurio, Amata, and Smith, Graham P.
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Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We present panoramic Spitzer/MIPS mid- and far-infrared and GALEX ultraviolet imaging of the the most massive and dynamically active system in the local Universe, the Shapley supercluster at z=0.048, covering the 5 clusters which make up the supercluster core. We combine these data with existing spectroscopic data from 814 confirmed supercluster members to produce the first study of a local rich cluster including both ultraviolet and infrared luminosity functions (LFs). This joint analysis allows us to produce a complete census of star-formation (both obscured and unobscured), extending down to SFRs~0.02-0.05Msun/yr, and quantify the level of obscuration of star formation among cluster galaxies, providing a local benchmark for comparison to ongoing and future studies of cluster galaxies at higher redshifts with Spitzer and Herschel. The GALEX NUV and FUV LFs obtained have steeper faint-end slopes than the local field population, due largely to the contribution of massive, quiescent galaxies at M_FUV>-16. The 24um and 70um galaxy LFs for the Shapley supercluster instead have shapes fully consistent with those obtained for the Coma cluster and for the local field galaxy population. This apparent lack of environmental dependence for the shape of the FIR luminosity function suggests that the bulk of the star-forming galaxies that make up the observed cluster infrared LF have been recently accreted from the field and have yet to have their star formation activity significantly affected by the cluster environment. We estimate a global SFR of 327 Msun/yr over the whole supercluster core, of which just ~20% is visible directly in the UV continuum and ~80% is reprocessed by dust and emitted in the infrared. The level of obscuration (L_IR/L_FUV) in star-forming galaxies is seen to increase linearly with L_K over two orders of magnitude in stellar mass., Comment: 19 pages, 17 figures. Accepted for publication in MNRAS
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- 2010
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18. Star formation, starbursts and quenching across the Coma supercluster
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Mahajan, Smriti, Haines, Chris P., and Raychaudhury, Somak
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Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We analyse Spitzer MIPS 24micron observations, and SDSS (DR7) optical broadband photometry and spectra, to investigate the star formation (SF) properties of galaxies residing in the Coma supercluster region. We find that SF in dwarf galaxies is quenched only in the high density environment at the centre of clusters and groups, but passively-evolving massive galaxies are found in all environments, indicating that massive galaxies can become passive via internal processes. We find AGN activity is suppressed in the cluster cores. We present evidence for a strong dependence of the mechanism(s) responsible for quenching SF in dwarf galaxies on the cluster potential. We find a significant increase in the mean EW of Halpha among star-forming dwarf galaxies in the infall regions of the Coma cluster and the core of Abell 1367 with respect to the overall supercluster population, indicative of the infalling dwarf galaxies undergoing a starburst phase. We identify these starburst galaxies as the precursors of the post-starburst k+A galaxies. We find that 11.4% of all dwarf (z mag > 15) galaxies in the Coma cluster and 4.8% in the Abell 1367 have k+A like spectra, while this fraction is just 2.1% when averaged over the entire supercluster region. We show that in the centre of the Coma cluster, the (24-z) colour of galaxies is correlated with their optical (g-r) colour and Halpha emission. By analysing the projected phase space distribution of galaxies detected at 24micron in Coma, we find that the (optically) red 24 micron detected galaxies follow the general distribution of `all' the spectroscopic members, but their (optically) blue counterparts show interesting features, indicative of recent infall., Comment: 17 pages, 14 figures, accepted for publicaton in MNRAS
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- 2010
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19. Impact Sensitivity and Ignition Mechanisms of Nanoaluminum-poly(perfluorinated methacrylate) Nanocomposites
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Morris, Lauren A., Thompson, Darla Graff, DeLuca, Racci, Shelburne, Ian, Gunduz, I. Emre, Son, Steven F., and Haines, Chris D.
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- 2018
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20. Staggering and Unwinding on an Athletics Track: Interesting Curves
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Haines, Chris
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With the London 2012 Olympics coming up, now is a good time for teachers to turn to track and field athletics for an application that has the potential to be intrinsically interesting to many pupils in schools new undergraduates. In this article, curves, well-known amongst former generations of pupils, are revisited by looking at the markings on the track for competitors in a range of events. Reciprocal spirals and involutes of circles emerge. These describe staggered starts and curved start lines, respectively. Modelling and other practical tasks based on measurements laid down by the IAAF are discussed.
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- 2011
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21. Enigmatic Variations: Honours Degree Assessment Regulations in the UK
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Yorke, Mantz, Woolf, Harvey, Stowell, Marie, Allen, Rick, Haines, Chris, Redding, Marian, Scurry, Dave, Taylor-Russell, Graham, Turnbull, Wayne, and Walker, Lawrie
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The debate in the UK about the continued existence of the honours degree classification led to a survey of the assessment regulations in 35 varied higher education institutions. This revealed considerable variation in the way in which honours degree classifications are determined, and also in the handling of weak performances by students. Such variability, deriving from a system in which institutional autonomy is to the fore, raises a question about equitability in the treatment of students. A brief allusion is made to the variability in assessment regulations in the US and Australia.
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- 2008
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22. Mining Institutional Datasets to Support Policy Making and Implementation
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Yorke, Mantz, Barnett, Greg, Evanson, Peter, Haines, Chris, Jenkins, Don, Knight, Peter, Scurry, Dave, Stowell, Marie, and Woolf, Harvey
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Datasets are often under-exploited by institutions, yet they contain evidence that is potentially of high value for planning and decision-making. This article shows how institutional data were used to determine whether the demographic background of students might have an influence on their performance: this is a matter of particular interest where participation in higher education is being widened. Analyses showed that, whilst area of domicile appeared to be related to lower performance in a few disciplinary areas, much stronger relationships were evident in respect of other demographic variables. The use of nonparametric analyses based on cutting module performances at the median, rather than using raw scores, is of methodological interest since the distribution of raw marks is influenced by the subject discipline.
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- 2005
23. Self-Help in Research and Development Relating to Assessment: A Case Study
- Author
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Yorke, Mantz, Barnett, Greg, Evanson, Peter, Haines, Chris, Jenkins, Don, Knight, Peter, Scurry, Dave, Stowell, Marie, and Woolf, Harvey
- Abstract
This article briefly chronicles nearly a decade of research and development activity undertaken in the area of assessment by a group of committed volunteers, "The Student Assessment and Classification Working Group" (SACWG). However, greater attention is given to demonstrating what a self-help approach can achieve in respect of research and development in higher education, and to identifying the factors that contribute to success in this respect. It is suggested that the approach has transfer value, provided that certain conditions are met. (Contains 1 note.)
- Published
- 2004
24. Some Effects of the Award Algorithm on Honours Degree Classifications in UK Higher Education
- Author
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Yorke, Mantz, Barnett, Greg, Evanson, Peter, Haines, Chris, Jenkins, Don, Knight, Peter, Scurry, Dave, Stowell, Marie, and Woolf, Harvey
- Abstract
In earlier work the Student Assessment and Classification Working Group (SACWG) found that up to 15% of honours classifications in UK higher education might be different if the results had been fed through another institution's award algorithm. In this article a more sensitive analysis has been applied to two blocks of institutional results that have been treated to reflect two variations that can be found in the range of honours degree award algorithms in use in UK higher education: (a) the relative weighting of performances in the second and third (or final) year of full-time study; and (b) the number of results that can be "dropped" in determining the degree classification. The analyses indicate that a student's honours degree classification may be affected by the way in which a degree classification is computed. Dropping the "worst" 30 credit points from the normal 240 of the final two years of study might raise one classification in six, and (separately) changing the weightings of Year 2:Year 3 results from 50:50 to 25:75 might change one in ten, the majority of changes being upwards. (Contains 9 tables and 1 note.)
- Published
- 2004
25. Disentangling the Nexus: Attitudes to Mathematics and Technology in a Computer Learning Environment.
- Author
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Galbraith, Peter and Haines, Chris
- Abstract
Reviews research into the impact of technology on teaching and learning in mathematics. Discusses the relationship between affective variables and performance, and having constructed appropriate measures of attitude. Presents the results from an extensive initial study that disentangles affects related to mathematics and computing, and in doing so identifies attributes that are important where mathematics and computing interact. Contains 28 references. (Author/ASK)
- Published
- 1998
26. Assessing Mathematical Communications about Projects and Investigations.
- Author
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Haines, Chris and Izard, John
- Abstract
Projects and investigations, which provide evidence of communication in mathematics, are discussed as a means to the direct assessment of the true objectives of the curriculum. Included are discussions of appropriate assessment, authentic assessment, and assessment of oral communication. (23 references) (Author/MKR)
- Published
- 1994
27. Spark Plasma Sintering of Nanostructured Aluminum: Influence of Tooling Material on Microstructure
- Author
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Liu, Dongming, Xiong, Yuhong, Li, Ying, Topping, Troy D., Zhou, Yizhang, Haines, Chris, Paras, Joseph, Martin, Darold, Kapoor, Deepak, Schoenung, Julie M., and Lavernia, Enrique J.
- Published
- 2013
- Full Text
- View/download PDF
28. LoCuSS: The Splashback Radius of Massive Galaxy Clusters and Its Dependence on Cluster Merger History
- Author
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Bianconi, Matteo, primary, Buscicchio, Riccardo, additional, Smith, Graham P., additional, McGee, Sean L., additional, Haines, Chris P., additional, Finoguenov, Alexis, additional, and Babul, Arif, additional
- Published
- 2021
- Full Text
- View/download PDF
29. Spark Plasma Sintering of Cryomilled Nanocrystalline Al Alloy - Part II: Influence of Processing Conditions on Densification and Properties
- Author
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Liu, Dongming, Xiong, Yuhong, Topping, Troy D., Zhou, Yizhang, Haines, Chris, Paras, Joseph, Martin, Darold, Kapoor, Deepak, Schoenung, Julie M., and Lavernia, Enrique J.
- Published
- 2012
- Full Text
- View/download PDF
30. Spark Plasma Sintering of Cryomilled Nanocrystalline Al Alloy - Part I: Microstructure Evolution
- Author
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Xiong, Yuhong, Liu, Dongming, Li, Ying, Zheng, Baolong, Haines, Chris, Paras, Joseph, Martin, Darold, Kapoor, Deepak, Lavernia, Enrique J., and Schoenung, Julie M.
- Published
- 2012
- Full Text
- View/download PDF
31. Disentangling the Nexus: Attitudes to Mathematics and Technology in a Computer Learning Environment
- Author
-
Galbraith, Peter and Haines, Chris
- Published
- 1998
- Full Text
- View/download PDF
32. Assessing mathematical communications about projects and investigations
- Author
-
Haines, Chris and Izard, John
- Published
- 1994
- Full Text
- View/download PDF
33. Detection of anti-correlation of hot and cold baryons in galaxy clusters
- Author
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Farahi, Arya, primary, Mulroy, Sarah L., additional, Evrard, August E., additional, Smith, Graham P., additional, Finoguenov, Alexis, additional, Bourdin, Hervé, additional, Carlstrom, John E., additional, Haines, Chris P., additional, Marrone, Daniel P., additional, Martino, Rossella, additional, Mazzotta, Pasquale, additional, O’Donnell, Christine, additional, and Okabe, Nobuhiro, additional
- Published
- 2019
- Full Text
- View/download PDF
34. LoCuSS: scaling relations between galaxy cluster mass, gas, and stellar content
- Author
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Mulroy, Sarah L, primary, Farahi, Arya, additional, Evrard, August E, additional, Smith, Graham P, additional, Finoguenov, Alexis, additional, O’Donnell, Christine, additional, Marrone, Daniel P, additional, Abdulla, Zubair, additional, Bourdin, Hervé, additional, Carlstrom, John E, additional, Démoclès, Jessica, additional, Haines, Chris P, additional, Martino, Rossella, additional, Mazzotta, Pasquale, additional, McGee, Sean L, additional, and Okabe, Nobuhiro, additional
- Published
- 2019
- Full Text
- View/download PDF
35. An Interacting Galaxy Pair at the Origin of a Light Echo
- Author
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Merluzzi, Paola, primary, Busarello, Giovanni, additional, Dopita, Michael A., additional, Thomas, Adam D., additional, Haines, Chris P., additional, Grado, Aniello, additional, Limatola, Luca, additional, and Mercurio, Amata, additional
- Published
- 2018
- Full Text
- View/download PDF
36. Galaxy cluster luminosities and colours, and their dependence on cluster mass and merger state
- Author
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Mulroy, Sarah L., primary, McGee, Sean L., additional, Gillman, Steven, additional, Smith, Graham P., additional, Haines, Chris P., additional, Démoclès, Jessica, additional, Okabe, Nobuhiro, additional, and Egami, Eiichi, additional
- Published
- 2017
- Full Text
- View/download PDF
37. The Complete Local Volume Groups Sample – I. Sample selection and X-ray properties of the high-richness subsample
- Author
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O'Sullivan, Ewan, primary, Ponman, Trevor J., additional, Kolokythas, Konstantinos, additional, Raychaudhury, Somak, additional, Babul, Arif, additional, Vrtilek, Jan M., additional, David, Laurence P., additional, Giacintucci, Simona, additional, Gitti, Myriam, additional, and Haines, Chris P., additional
- Published
- 2017
- Full Text
- View/download PDF
38. LoCuSS: exploring the selection of faint blue background galaxies for cluster weak-lensing
- Author
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Ziparo, Felicia, primary, Smith, Graham P., additional, Okabe, Nobuhiro, additional, Haines, Chris P., additional, Pereira, Maria J., additional, and Egami, Eiichi, additional
- Published
- 2016
- Full Text
- View/download PDF
39. GLACE survey: OSIRIS/GTC Tuneable Filter H$��$ imaging of the rich galaxy cluster ZwCl 0024.0+1652 at z = 0.395. Part I -- Survey presentation, TF data reduction techniques and catalogue
- Author
-
S��nchez-Portal, Miguel, Pintos-Castro, Irene, P��rez-Mart��nez, Ricardo, Cepa, Jordi, Garc��a, Ana M. P��rez, Dom��nguez-S��nchez, Helena, Bongiovanni, ��ngel, Serra, Ana L., Alfaro, Emilio, Altieri, Bruno, Arag��n-Salamanca, Alfonso, Balkowski, Chantal, Biviano, Andrea, Bremer, Malcom, Castander, Francisco, Casta��eda, H��ctor, Castro-Rodr��guez, Nieves, Chies-Santos, Ana L., Coia, Daniela, Diaferio, Antonaldo, Duc, Pierre-Alain, Ederoclite, Alessandro, Geach, James, Gonz��lez-Serrano, Ignacio, Haines, Chris. P., McBreen, Brian, Metcalfe, Leo, Oteo, Iv��n, P��rez-Fourn��n, Ismael, Poggianti, Bianca, Polednikova, Jana, Ram��n-P��rez, Marina, Rodr��guez-Espinosa, Jos�� M., Santos, Joana S., Smail, Ian, Smith, Graham P., Temporin, Sonia, and Valtchanov, Ivan
- Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Astrophysics of Galaxies (astro-ph.GA) ,FOS: Physical sciences - Abstract
The cores of clusters at 0 $\lesssim$ z $\lesssim$ 1 are dominated by quiescent early-type galaxies, whereas the field is dominated by star-forming late-type ones. Galaxy properties, notably the star formation (SF) ability, are altered as they fall into overdense regions. The critical issues to understand this evolution are how the truncation of SF is connected to the morphological transformation and the responsible physical mechanism. The GaLAxy Cluster Evolution Survey (GLACE) is conducting a study on the variation of galaxy properties (SF, AGN, morphology) as a function of environment in a representative sample of clusters. A deep survey of emission line galaxies (ELG) is being performed, mapping a set of optical lines ([OII], [OIII], H$��$ and H$��$/[NII]) in several clusters at z $\sim$ 0.40, 0.63 and 0.86. Using the Tunable Filters (TF) of OSIRIS/GTC, GLACE applies the technique of TF tomography: for each line, a set of images at different wavelengths are taken through the TF, to cover a rest frame velocity range of several thousands km/s. The first GLACE results target the H$��$/[NII] lines in the cluster ZwCl 0024.0+1652 at z = 0.395 covering $\sim$ 2 $\times$ r$_{vir}$. We discuss the techniques devised to process the TF tomography observations to generate the catalogue of H$��$ emitters of 174 unique cluster sources down to a SFR below 1 M$_{\odot}$/yr. The AGN population is discriminated using different diagnostics and found to be $\sim$ 37% of the ELG population. The median SFR is 1.4 M$_{\odot}$/yr. We have studied the spatial distribution of ELG, confirming the existence of two components in the redshift space. Finally, we have exploited the outstanding spectral resolution of the TF to estimate the cluster mass from ELG dynamics, finding M$_{200}$ = 4.1 $\times$ 10$^{14}$ M$_{\odot} h^{-1}$, in agreement with previous weak-lensing estimates., 23 pages, 13 figures, accepted for publication in A&A. Astro-ph abstract abridged
- Published
- 2015
- Full Text
- View/download PDF
40. BUDHIES – III: the fate of H i and the quenching of galaxies in evolving environments
- Author
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Jaffé, Yara L., primary, Verheijen, Marc A. W., additional, Haines, Chris P., additional, Yoon, Hyein, additional, Cybulski, Ryan, additional, Montero-Castaño, María, additional, Smith, Rory, additional, Chung, Aeree, additional, Deshev, Boris Z., additional, Fernández, Ximena, additional, van Gorkom, Jacqueline, additional, Poggianti, Bianca M., additional, Yun, Min S., additional, Finoguenov, Alexis, additional, Smith, Graham P., additional, and Okabe, Nobuhiro, additional
- Published
- 2016
- Full Text
- View/download PDF
41. Early Science with the Large Millimeter Telescope: COOL BUDHIES I – a pilot study of molecular and atomic gas atz≃ 0.2
- Author
-
Cybulski, Ryan, primary, Yun, Min S., additional, Erickson, Neal, additional, De la Luz, Victor, additional, Narayanan, Gopal, additional, Montaña, Alfredo, additional, Sánchez, David, additional, Zavala, Jorge A., additional, Zeballos, Milagros, additional, Chung, Aeree, additional, Fernández, Ximena, additional, van Gorkom, Jacqueline, additional, Haines, Chris P., additional, Jaffé, Yara L., additional, Montero-Castaño, María, additional, Poggianti, Bianca M., additional, Verheijen, Marc A. W., additional, Yoon, Hyein, additional, Deshev, Boris Z., additional, Harrington, Kevin, additional, Hughes, David H., additional, Morrison, Glenn E., additional, Schloerb, F. Peter, additional, and Velazquez, Miguel, additional
- Published
- 2016
- Full Text
- View/download PDF
42. LoCuSS: the near-infrared luminosity and weak-lensing mass scaling relation of galaxy clusters
- Author
-
Mulroy, Sarah L., primary, Smith, Graham P., additional, Haines, Chris P., additional, Marrone, Daniel P., additional, Okabe, Nobuhiro, additional, Pereira, Maria J., additional, Egami, Eiichi, additional, Babul, Arif, additional, Finoguenov, Alexis, additional, and Martino, Rossella, additional
- Published
- 2014
- Full Text
- View/download PDF
43. Early Science with the Large Millimeter Telescope: COOL BUDHIES I - a pilot study of molecular and atomic gas at z ≃ 0.2.
- Author
-
Cybulski, Ryan, Yun, Min S., Erickson, Neal, De la Luz, Victor, Narayanan, Gopal, Montaça, Alfredo, Sánchez, David, Zavala, Jorge A., Zeballos, Milagros, Aeree Chung, Fernández, Ximena, van Gorkom, Jacqueline, Haines, Chris P., Jaffé, Yara L., Montero-Castaño, María, Poggianti, Bianca M., Verheijen, Marc A. W., Yoon, Hyein, Deshev, Boris Z., and Harrington, Kevin
- Subjects
COLD gases ,MOLECULAR clouds ,ASTRONOMICAL observations ,INFRARED astronomy ,REDSHIFT - Abstract
An understanding of the mass build-up in galaxies over time necessitates tracing the evolution of cold gas (molecular and atomic) in galaxies. To that end, we have conducted a pilot study called CO Observations with the LMT of the Blind Ultra-Deep H I Environment Survey (COOL BUDHIES).We have observed 23 galaxies in and around the two clusters Abell 2192 (z = 0.188) and Abell 963 (z = 0.206), where 12 are cluster members and 11 are slightly in the foreground or background, using about 28 total hours on the Redshift Search Receiver on the Large Millimeter Telescope (LMT) to measure the
12 CO J= 1→0 emission line and obtain molecular gas masses. These new observations provide a unique opportunity to probe both the molecular and atomic components of galaxies as a function of environment beyond the local Universe. For our sample of 23 galaxies, nine have reliable detections (S/N ≥ 3.6) of the12 COline, and another six have marginal detections (2.0 < S/N < 3.6). For the remaining eight targets we can place upper limits on molecular gas masses roughly between 109 and 1010 M☉ . Comparing our results to other studies of molecular gas, we find that our sample is significantly more abundant in molecular gas overall, when compared to the stellar and the atomic gas component, and our median molecular gas fraction lies about 1σ above the upper limits of proposed redshift evolution in earlier studies. We discuss possible reasons for this discrepancy, with the most likely conclusion being target selection and Eddington bias. [ABSTRACT FROM AUTHOR]- Published
- 2016
- Full Text
- View/download PDF
44. The evolution of dwarf galaxies in the Coma supercluster
- Author
-
Mahajan, Smriti, primary, Haines, Chris P., additional, and Raychaudhury, Somak, additional
- Published
- 2011
- Full Text
- View/download PDF
45. Star formation, starbursts and quenching across the Coma supercluster
- Author
-
Mahajan, Smriti, primary, Haines, Chris P., additional, and Raychaudhury, Somak, additional
- Published
- 2010
- Full Text
- View/download PDF
46. Classroom Activities and the Teacher.
- Author
-
Artigue, Michèle, Hodgson, Bernard R., Blum, Werner, Galbraith, Peter L., Henn, Hans-Wolfgang, Muller, Eric, Antonius, Soeren, Haines, Chris, Jensen, Tomas Højgaard, Niss, Mogens, and Burkhardt, Hugh
- Abstract
In this section we discuss a broad range of classroom activities, and of teaching style, that are required to produce the benefits that modeling can provide to the student learning mathematics. We discuss support for teachers and the shortage of good modeling tasks that need to be developed into effective curriculum materials. [ABSTRACT FROM AUTHOR]
- Published
- 2007
- Full Text
- View/download PDF
47. FIELD-ASSISTED SINTERING OF TUNGSTEN-, TANTALUM-, AND TUNGSTEN CARBIDE-BASE MATERIALS.
- Author
-
Chanthapan, Sinthu, Singh, Jogender, Kulkarni, Anil, Haines, Chris, and Kapoor, Deepak
- Subjects
SINTERING ,MICROSTRUCTURE ,TUNGSTEN ,HARDNESS ,IRON metallurgy ,POWDER metallurgy - Abstract
The article presents a study which investigated the effects of sintering parameters on densification, microstructure, and the hardness of tungsten-, tantalum-, and tungsten carbide (WC)-base materials. The researchers found that close to pore-free dense sintered products can be obtained at a low temperature without the aid of additives. WC-base materials sintered by field assisted sintering technology (FAST) showed a lower sintering temperature and higher hardness compared with counterpart.
- Published
- 2011
48. Peltier effect during spark plasma sintering of boron carbide.
- Author
-
Diatta, Joseph, Torresani, Elisa, Maximenko, Andrey, Haines, Chris, Martin, Darold, and Olevsky, Eugene
- Abstract
• The impact of the Peltier effect on boron carbide spark plasma sintering is evaluated. • The Peltier effect impacts grain growth and densification in field assisted sintering. • The Peltier effect causes temperature gradients in spark plasma sintered samples. The influence of the Peltier thermoelectric effect on the evolution of temperature, density, and grain size heterogeneities during spark plasma sintering (SPS) of boron carbide is numerically evaluated. An electro-thermo-mechanical model of the SPS process, which takes into account the thermoelectric effects, is developed and incorporated in a finite element code. A grain growth law is integrated in the numerical model. The model predictions are verified via comparison with the microstructure evolution data experimentally obtained by high resolution scanning electron microscopy of the boron carbide specimens processed by SPS. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
49. A useful group and an uninteresting operation
- Author
-
Haines, Chris
- Abstract
I am continually surprised by the mathematical structure which surfaces in unexpected situations, and even more so when arranging a tenth birthday party for my elder son. The invasion of the home by some eight rather energetic boys on a cold February afternoon was viewed with some trepidation. The instinct of self preservation was uppermost in the search for activities which would allow the afternoon to pass with the minimum of discomfort and the maximum enjoyment. A family friend is very good at organising team games at parties, but with a space problem (our house does not have a large living room as so many modern houses have these days) it was important to split the children up for their activities, but yet devise a programme which was coherent.
- Published
- 1983
- Full Text
- View/download PDF
50. Re-enactment.
- Author
-
Haines, Chris
- Subjects
HISTORICAL reenactments ,HISTORICAL archaeology ,HISTORICAL television programs ,ARCHAEOLOGICAL societies - Abstract
Focuses on the practice of historical re-enactment in Great Britain. Historical background of the re-enactment practice; Influence of re-enactment on historical television; Ways to participate in a re-enactment group or hire a re-enactment group; Associations in Great Britain with strong connections to archaeology.
- Published
- 2006
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