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Start Over Author "Vallini, L" Publisher oxford university press (oup)
37 results on '"Vallini, L"'

2. A survey of high-z galaxies: SERRA simulations

Author

Pallottini, A, primary, Ferrara, A, additional, Gallerani, S, additional, Behrens, C, additional, Kohandel, M, additional, Carniani, S, additional, Vallini, L, additional, Salvadori, S, additional, Gelli, V, additional, Sommovigo, L, additional, D’Odorico, V, additional, Di Mascia, F, additional, and Pizzati, E, additional

Published
2022
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5. Missing [C ii] emission from early galaxies

Author

Carniani, S, primary, Ferrara, A, additional, Maiolino, R, additional, Castellano, M, additional, Gallerani, S, additional, Fontana, A, additional, Kohandel, M, additional, Lupi, A, additional, Pallottini, A, additional, Pentericci, L, additional, Vallini, L, additional, and Vanzella, E, additional

Published
2020
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7. The ALPINE−ALMA [C ii] Survey: on the nature of an extremely obscured serendipitous galaxy

Author

Romano, M, primary, Cassata, P, additional, Morselli, L, additional, Lemaux, B C, additional, Béthermin, M, additional, Capak, P, additional, Faisst, A, additional, Le Fèvre, O, additional, Schaerer, D, additional, Silverman, J, additional, Yan, L, additional, Bardelli, S, additional, Boquien, M, additional, Cimatti, A, additional, Dessauges-Zavadsky, M, additional, Enia, A, additional, Fudamoto, Y, additional, Fujimoto, S, additional, Ginolfi, M, additional, Gruppioni, C, additional, Hathi, N P, additional, Ibar, E, additional, Jones, G C, additional, Koekemoer, A M, additional, Loiacono, F, additional, Mancini, C, additional, Riechers, D A, additional, Rodighiero, G, additional, Rodríguez-Muñoz, L, additional, Talia, M, additional, Vallini, L, additional, Vergani, D, additional, Zamorani, G, additional, and Zucca, E, additional

Published
2020
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11. The ALPINE-ALMA [C ii] survey: a triple merger at z ∼ 4.56

Author

Jones, G C, primary, Béthermin, M, additional, Fudamoto, Y, additional, Ginolfi, M, additional, Capak, P, additional, Cassata, P, additional, Faisst, A, additional, Le Fèvre, O, additional, Schaerer, D, additional, Silverman, J D, additional, Yan, Lin, additional, Bardelli, S, additional, Boquien, M, additional, Cimatti, A, additional, Dessauges-Zavadsky, M, additional, Giavalisco, M, additional, Gruppioni, C, additional, Ibar, E, additional, Khusanova, Y, additional, Koekemoer, A M, additional, Lemaux, B C, additional, Loiacono, F, additional, Maiolino, R, additional, Oesch, P A, additional, Pozzi, F, additional, Riechers, D, additional, Rodighiero, G, additional, Talia, M, additional, Vallini, L, additional, Vergani, D, additional, Zamorani, G, additional, and Zucca, E, additional

Published
2019
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12. Constraints on high-J CO emission lines in z ∼ 6 quasars

Author

Carniani, S, primary, Gallerani, S, additional, Vallini, L, additional, Pallottini, A, additional, Tazzari, M, additional, Ferrara, A, additional, Maiolino, R, additional, Cicone, C, additional, Feruglio, C, additional, Neri, R, additional, D’Odorico, V, additional, Wang, R, additional, and Li, J, additional

Published
2019
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18. ALMA suggests outflows in z ~ 5.5 galaxies

Author

Gallerani, S, Pallottini, A, Feruglio, C, Ferrara, A, Maiolino, R, Vallini, L, Riechers, DA, Pavesi, R, Pallottini, Andrea [0000-0002-7129-5761], Maiolino, Roberto [0000-0002-4985-3819], and Apollo - University of Cambridge Repository

Subjects
galaxies: high-redshift, galaxies: evolution, galaxies: ISM
Abstract

We present the first attempt to detect outflows from galaxies approaching the Epoch of Reionization (EoR) using a sample of 9 star-forming ($\rm SFR=31\pm 20~M_{\odot}~yr^{-1}$) $z\sim 5.5$ galaxies for which the [CII]158$\mu$m line has been previously obtained with ALMA. We first fit each line with a Gaussian function and compute the residuals by subtracting the best fitting model from the data. We combine the residuals of all sample galaxies and find that the total signal is characterised by a flux excess of $\sim 0.5$ mJy extended over $\sim 1000$ km~s$^{-1}$. Although we cannot exclude that part of this signal is due to emission from faint satellite galaxies, we show that the most probable explanation for the detected flux excess is the presence of broad wings in the [CII] lines, signatures of starburst-driven outflows. We infer an average outflow rate of $\rm \dot{M}=54\pm23~ M_{\odot}~yr^{-1}$, providing a loading factor $\eta=\rm \dot{M}/SFR=1.7\pm1.3$ in agreement with observed local starbursts. Our interpretation is consistent with outcomes from zoomed hydro-simulations of {\it Dahlia}, a $z\sim 6$ galaxy ($\rm SFR\sim 100~\rm M_{\odot}~yr^{-1}$) whose feedback-regulated star formation results into an outflow rate $\rm \dot{M}\sim 30~ M_{\odot}~yr^{-1}$. The quality of the ALMA data is not sufficient for a detailed analysis of the [CII] line profile in individual galaxies. Nevertheless, our results suggest that starburst-driven outflows are in place in the EoR and provide useful indications for future ALMA campaigns. Deeper observations of the [CII] line in this sample are required to better characterise feedback at high-$z$ and to understand the role of outflows in shaping early galaxy formation.

Published
2018

21. ALMA view of a massive spheroid progenitor: a compact rotating core of molecular gas in an AGN host at z = 2.226

Author

Talia, M, primary, Pozzi, F, additional, Vallini, L, additional, Cimatti, A, additional, Cassata, P, additional, Fraternali, F, additional, Brusa, M, additional, Daddi, E, additional, Delvecchio, I, additional, Ibar, E, additional, Liuzzo, E, additional, Vignali, C, additional, Massardi, M, additional, Zamorani, G, additional, Gruppioni, C, additional, Renzini, A, additional, Mignoli, M, additional, Pozzetti, L, additional, and Rodighiero, G, additional

Published
2018
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23. ALMA suggests outflows in z ∼ 5.5 galaxies

Author

Gallerani, S., primary, Pallottini, A., additional, Feruglio, C., additional, Ferrara, A., additional, Maiolino, R., additional, Vallini, L., additional, Riechers, D. A., additional, and Pavesi, R., additional

Published
2017
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33. The assembly of ‘normal’ galaxies atz ∼ 7 probed by ALMA

Author

Maiolino, R., primary, Carniani, S., additional, Fontana, A., additional, Vallini, L., additional, Pentericci, L., additional, Ferrara, A., additional, Vanzella, E., additional, Grazian, A., additional, Gallerani, S., additional, Castellano, M., additional, Cristiani, S., additional, Brammer, G., additional, Santini, P., additional, Wagg, J., additional, and Williams, R., additional

Published
2015
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35. The ALPINE−ALMA [C <scp>ii</scp>] Survey: on the nature of an extremely obscured serendipitous galaxy

Author

S. Bardelli, Paolo Cassata, G. C. Jones, Michele Ginolfi, Andreas L. Faisst, L. Morselli, Livia Vallini, Matthieu Béthermin, O. Le Fevre, D. Vergani, Y. Fudamoto, Miroslava Dessauges-Zavadsky, G. Rodighiero, E. Zucca, Edo Ibar, Margherita Talia, John D. Silverman, Dominik Riechers, Brian C. Lemaux, Peter Capak, Daniel Schaerer, Seiji Fujimoto, A. Enia, Médéric Boquien, Lin Yan, Andrea Cimatti, Chiara Mancini, L. Rodríguez-Muñoz, F. Loiacono, G. Zamorani, M. Romano, Nimish P. Hathi, Carlotta Gruppioni, Anton M. Koekemoer, Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Romano, M., Cassata, P., Morselli, L., Lemaux, B. C., Bethermin, M. M., Capak, P., Faisst, A., Le Fevre, O., Schaerer, D., Silverman, J., Yan, L., Bardelli, S., Boquien, M., Cimatti, A., Dessauges-Zavadsky, M., Enia, A., Fudamoto, Y., Fujimoto, S., Ginolfi, M., Gruppioni, C., Hathi, N. P., Ibar, E., Jones, G. C., Koekemoer, A. M., Loiacono, F., Mancini, C., Riechers, D. A., Rodighiero, G., Rodriguez-Munoz, L., Talia, M., Vallini, L., Vergani, D., Zamorani, G., Zucca, E., Romano M., Cassata P., Morselli L., Lemaux B.C., Bethermin M.M., Capak P., Faisst A., Le Fevre O., Schaerer D., Silverman J., Yan L., Bardelli S., Boquien M., Cimatti A., Dessauges-Zavadsky M., Enia A., Fudamoto Y., Fujimoto S., Ginolfi M., Gruppioni C., Hathi N.P., Ibar E., Jones G.C., Koekemoer A.M., Loiacono F., Mancini C., Riechers D.A., Rodighiero G., Rodriguez-Munoz L., Talia M., Vallini L., Vergani D., Zamorani G., and Zucca E.

Subjects
Stellar mass, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, MASS, 01 natural sciences, Luminosity, Settore FIS/05 - Astronomia e Astrofisica, galaxies: high-redshift, 0103 physical sciences, STAR-FORMING GALAXIES, PHOTOMETRIC REDSHIFTS, 010303 astronomy & astrophysics, Reionization, evolution [galaxies], Astrophysics::Galaxy Astrophysics, COSMOS, Physics, galaxies: evolution, SUBMILLIMETER GALAXIES, INTERSTELLAR-MEDIUM, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 010308 nuclear & particles physics, Star formation, Astronomy and Astrophysics, DUST CONTENT, Atacama Large Millimeter Array, Astrophysics - Astrophysics of Galaxies, Galaxy, Redshift, STELLAR, [SDU]Sciences of the Universe [physics], Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Spectral energy distribution, Astrophysics::Earth and Planetary Astrophysics, EMISSION, FAR-INFRARED SPECTROSCOPY, high-redshift [galaxies]
Abstract

We report the serendipitous discovery of a bright galaxy (Gal-A) observed as part of the ALMA Large Program to INvestigate [CII] at Early times (ALPINE). While this galaxy is detected both in line and continuum emission in ALMA Band 7, it is completely dark in UV/optical filters and only presents a marginal detection in the UltraVISTA Ks band. We discuss the nature of the observed ALMA line, i.e. whether the emission comes from [CII] at z~4.6, or from high-J CO transitions at z~2.2. In the first case we find a [CII]-to-FIR luminosity ratio of log(L_[CII]/L_FIR)=-2.5, consistent with the average value for local star-forming galaxies (SFGs); in the second case, instead, the source would lie outside of the empirical relations between L_CO and L_FIR found in the literature. At both redshifts, we derive the star-formation rate (SFR) from the ALMA continuum, and the stellar mass (M*) by using stellar population synthesis models as input for LePHARE spectral energy distribution (SED) fitting. Exploiting our results, we believe that Gal-A is a Main-Sequence (MS), dusty SFG at z=4.6 (i.e. [CII] emitter) with log(SFR/[M/yr])~1.4 and log(M*/M)~9.7. This work underlines the crucial role of the ALPINE survey in making a census of this class of objects, in order to unveil their contribution to the global star-formation rate density (SFRD) of the Universe at the end of the Reionisation epoch., Comment: 13 pages, 6 figures. Submitted to MNRAS

Published
2020
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36. Dust temperature in ALMA [C <scp>ii</scp>]-detected high-z galaxies

Author

Andrea Ferrara, Livia Vallini, A. Zanella, S. Carniani, Andrea Pallottini, L Sommovigo, Simona Gallerani, Sommovigo, L, Ferrara, A, Carniani, S, Zanella, A, Pallottini, A, Gallerani, S, and Vallini, L

Subjects
Physics, 010308 nuclear & particles physics, Extinction (astronomy), ISM [infrared], Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Galaxy, Redshift, Spectral line, Luminosity, analytical [methods], Settore FIS/05 - Astronomia e Astrofisica, Space and Planetary Science, data analysi [methods], 0103 physical sciences, dust, extinction, Continuum (set theory), Surface brightness, 010303 astronomy & astrophysics, high-redshift [galaxies], Astrophysics::Galaxy Astrophysics, Line (formation)
Abstract

At redshift z > 5, the far-infrared (FIR) continuum spectra of main-sequence galaxies are sparsely sampled, often with a single data point. The dust temperature Td,SED, thus has to be assumed in the FIR continuum fitting. This introduces large uncertainties regarding the derived dust mass (Md), FIR luminosity, and obscured fraction of the star formation rate. These are crucial quantities to quantify the effect of dust obscuration in high-z galaxies. To overcome observation limitations, we introduce a new method that combines dust continuum information with the overlying [C $\scriptstyle \rm II$] 158 µm line emission. By breaking the Md–Td,SED degeneracy, with our method, we can reliably constrain the dust temperature with a single observation at 158 µm. This method can be applied to all Atacama Large Millimeter Array (ALMA) and NOEMA [C $\scriptstyle \rm II$] observations, and exploited in ALMA Large Programs such as ALPINE and REBELS targeting [C $\scriptstyle \rm II$] emitters at high-z. We also provide a physical interpretation of the empirical relation recently found between molecular gas mass and [C $\scriptstyle \rm II$] luminosity. We derive an analogous relation linking the total gas surface density and [C $\scriptstyle \rm II$] surface brightness. By combining the two, we predict the cosmic evolution of the surface density ratio $\Sigma _{\rm H_2} / \Sigma _{\rm gas}$. We find that $\Sigma _{\rm H_2} / \Sigma _{\rm gas}$ slowly increases with redshift, which is compatible with current observations at 0 < z < 4.

Published
2021
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37. Photoevaporation of Jeans-unstable molecular clumps

Author

D. Decataldo, Andrea Ferrara, Livia Vallini, Simona Gallerani, Andrea Pallottini, Decataldo, D, Pallottini, A, Ferrara, A, Vallini, L, and Gallerani, S

Subjects
Physics, 010308 nuclear & particles physics, Isotropy, photodissociation region (PDR), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Radiation, ISM - cloud, Astrophysics - Astrophysics of Galaxies, 01 natural sciences, Photoevaporation, interstellar medium - molecular cloud, Settore FIS/05 - Astronomia e Astrofisica, 13. Climate action, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), 0103 physical sciences, Radiative transfer, methods - numerical, ISM - evolution, 010303 astronomy & astrophysics
Abstract

We study the photoevaporation of Jeans-unstable molecular clumps by isotropic FUV (6 eV $< {\rm h}��$ < 13.6 eV) radiation, through 3D radiative transfer hydrodynamical simulations implementing a non-equilibrium chemical network that includes the formation and dissociation of H$_2$. We run a set of simulations considering different clump masses ($M=10-200$ M$_\odot$) and impinging fluxes ($G_0=2\times 10^3-8\times 10^4$ in Habing units). In the initial phase, the radiation sweeps the clump as an R-type dissociation front, reducing the H$_2$ mass by a factor 40-90%. Then, a weak ($\mathcal{M}\simeq 2$) shock develops and travels towards the centre of the clump, which collapses while loosing mass from its surface. All considered clumps remain gravitationally unstable even if radiation rips off most of the clump mass, showing that external FUV radiation is not able to stop clump collapse. However, the FUV intensity regulates the final H$_2$ mass available for star formation: for example, for $G_0 < 10^4$ more than 10% of the initial clump mass survives. Finally, for massive clumps ($\sim 100$ M$_\odot$) the H$_2$ mass increases by 25-50% during the collapse, mostly because of the rapid density growth that implies a more efficient H$_2$ self-shielding., 17 pages, 16 figures; added references, corrected typos

Published
2019
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