Chapters in the prehistory of Eastern Arizona, Paul S. Martin, et al.

Bowman, Daniel; Gregory, David A.; Hanson, John A.; Martin, Paul S.; Schiffer, Michael Brian; Wilcox, David; Williams, Patricia M.; Zubrow, Ezra B. W.

doi:10.5962/bhl.title.3340

Cited by 36 publications

(79 citation statements)

References 21 publications

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“…The main drawback of our model is that it predicts a low HCN ν 2 = 1 f J = 4 − 3 to J = 3 − 2 flux ratio of 1.7 owing to the extreme column densities, while the observed value is 2.0 ± 0.16 (Martín et al 2016). Arp 220E: the eastern nucleus of Arp 220 has been also imaged with high angular resolution in the (sub)millimeter.…”

Section: Comparison With Datamentioning

confidence: 89%

“…Absorption of thermal dust continuum by molecular lines at (sub)millimeter wavelengths has been inferred in several galactic nuclei (e.g. Sakamoto et al 2009;Martín et al 2016;Aladro et al 2018).…”

Section: Spatial Profilesmentioning

confidence: 99%

“…For the reason stated above, the more extended component at 3 mm is probably emitting in the far-IR, so that we adopt R out = 47 − 60 pc yielding ∆Ω = (4.1 − 6.7) × 10 −2 arc sec 2 . With the HCN flux of ∼ 28 Jy km s −1 (Martín et al 2016), F HCN ν2 3−2 /∆Ω = 400 − 700 Jy km s −1 arc sec −2 . This is significantly lower than the brightness of the line in NGC 4418, in agreement with the significantly lower excitation of the far-IR absorption lines in Arp 220, and can (3) Estimate for the outer radius of the cocoon reemitting the luminosity generated by the embedded source(s), based on both the measured sizes in the (sub)millimeter and on the calculated sizes from far-IR molecular absorption (see text); (4) Solid angle, calculated as in Table 1; (5) be explained with Σ IR = 1.1 × 10 8 L pc −2 (Fig.…”

Section: Comparison With Datamentioning

confidence: 99%

“…Probably due to the combination of high columns, which protect these species from photoionization, and high temperatures (Harada et al 2010), cyanopolynes attain high abundances and their vibrational lines are prominent in these regions in spite of their involved high-energy levels (> 1000 K for HCN). Following the first extragalactic detection of the HCN ν 2 = 1 f J = 3 − 2 and J = 4 − 3 lines in the prototypical BGN NGC 4418 (Sakamoto et al 2010), the HCN vibrational lines have been detected and imaged in a number of BGNs (Aalto et al 2015a,b;Martín et al 2016;Imanishi et al 2016a,b;Falstad et al 2018), indicating a very efficient pumping of the vibrational states through absorption of 14 µm continuum photons -the wavelength of the vibrational band detected in strong absorption towards the same objects by Lahuis et al (2007).…”

Section: Introductionmentioning

confidence: 99%

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The Greenhouse Effect in Buried Galactic Nuclei and the Resonant HCN Vibrational Emission

González-Alfonso

Sakamoto

2019

ApJ

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Recent interferometric observations have shown bright HCN emission from the ν 2 = 1 vibrational state arising in buried nuclear regions of galaxies, indicating an efficient pumping of the ν 2 = 1 state through absorption of 14 µm continuum photons. We have modeled the continuum and HCN vibrational line emission in these regions, characterized by high column densities of dust and high luminosities, with a spherically symmetric approach, simulating both a central heating source (AGN) and a compact nuclear starburst (SB). We find that when the H 2 columns become very high, N H2 10 25 cm −2 , trapping of continuum photons within the nuclear region dramatically enhances the dust temperature (T dust ) in the inner regions, even though the predicted spectral energy distribution as seen from outside becomes relatively cold. The models thus predict bright continuum at millimeter wavelengths for luminosity surface brightness (averaged over the model source) of ∼ 10 8 L pc −2 . This greenhouse effect significantly enhances the mean mid-infrared intensity within the dusty volume, populating the ν 2 = 1 state to the extent that the HCN vibrational lines become optically thick. AGN models yield higher T dust in the inner regions and higher peak (sub)millimeter continuum brightness than SB models, but similar HCN vibrational J = 3 − 2 and 4 − 3 emission owing to both optical depth effects and a moderate impact of high T dust on these low-J lines. The observed HCN vibrational emission in several galaxies can be accounted for with a HCN abundance of ∼ 10 −6 (relative to H 2 ) and luminosity surface brightness in the range (0.5 − 2) × 10 8 L pc −2 , predicting a far-infrared photosphere with T dust ∼ 80 − 150 K -in agreement with the values inferred from far-infrared molecular absorption.

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Section: Comparison With Datamentioning

confidence: 89%

Section: Spatial Profilesmentioning

confidence: 99%

Section: Comparison With Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Greenhouse Effect in Buried Galactic Nuclei and the Resonant HCN Vibrational Emission

González-Alfonso

Sakamoto

2019

ApJ

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“…East-Central Arizona (see Longacre 1970b;Hill 1970;Schoenweller 1962;Martin 1962). These studies indicated that major settlement.…”

Section: The Environmental Modelmentioning

confidence: 83%

Mormon Sociopolitical Development in Northern Arizona, 1876-1906: Implications for a Model of Prehistoric Change

Lightfoot¹

1980

Ethnohistory

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Differential cross sections for top pair production at the LHC

Guzzi

Lipka

Moch

2016

Nuclear and Particle Physics Proceedings

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We present results of phenomenological studies for top-quark pair production at the LHC at the center of mass energy √ S = 7 TeV. The transverse momentum and rapidity distributions for finalstate top quarks are calculated in perturbative QCD at approximate next-to-next-to-leading order O(α 4 s ) by using methods of threshold resummation beyond the leading logarithmic accuracy. The theoretical predictions are obtained by using the computer code DIFFTOP and are compared to recent measurements by the ATLAS and CMS collaborations. DIFFTOP can be employed in the general case of heavy-quark pair production at hadron-hadron colliders and provides a basis for applications in QCD analyses for parton distribution functions determination. Introduction.Since its discovery at the Tevatron, the top quark has been playing an extremely important role in particle phenomenology.Its mass, a fundamental parameter of the Standard Model (SM), is the largest in the quark families and it is close to the electroweak symmetry breaking (EWSB) scale. Therefore, the top quark behaves differently with respect to the other quarks for many reasons. The leading decay channel of the top-quark into a b quark and a W boson, is mainly controlled by weak interactions, thus decay properties like spin correlations and helicity can be investigated in a clean way in the decay products, before that hadronization takes place. This is crucial for precision measurements and tests of the electroweak (EW) sector. Furthermore, the mass of the top quark recently obtained from the combined results of the measurements of the CMS and ATLAS [1] collaborations at the LHC, is m t = 173.3 ± 0.76 GeV and since it is close to the mass of the Higgs boson, it gives us the possibility of studying the interplay between the Higgs sector and top-quark physics.Due to the large mass, processes involving final-state top quarks in high-energy hadronic reactions are excellent candidates to probe parton distribution functions (PDFs) of the proton in kinematic regions where these (particularly the gluon) are currently poorly constrained and are correlated with the strong coupling constant α s and top-quark mass m t .LHC run-I provided us with the possibility to perform precise measurements of total and differential cross sections for top-quark pair production at center-of-mass energies √ S = 7 and 8 TeV, recently published by the CMS [2, 3] and ATLAS [4,5,6] collaborations. These measurements are being used in multiple phenomenological analyses where tt data are used to test the properties of the Standard Model (SM), QCD factorization and to investigate possible signals of physics beyond the SM (BSM).Total and differential cross sections for tt pair production at the LHC are mostly driven by the gluon-gluon luminosity, in which the gluon PDF is probed at large values of the parton momentum fraction x ≈ 0.1. The inclusion of tt pair production measurements in global QCD analyses for PDF determinations will allows us to investigate the correlation between the top-quark mass m t , stron...

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Chapters in the prehistory of Eastern Arizona, Paul S. Martin, et al.

Cited by 36 publications

References 21 publications

The Greenhouse Effect in Buried Galactic Nuclei and the Resonant HCN Vibrational Emission

The Greenhouse Effect in Buried Galactic Nuclei and the Resonant HCN Vibrational Emission

Mormon Sociopolitical Development in Northern Arizona, 1876-1906: Implications for a Model of Prehistoric Change

Differential cross sections for top pair production at the LHC

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