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3 results on '"Rangwala, N."'

1. The central region of spiral galaxies as seen by Herschel

Author

Sauvage, M., Sacchi, N., Bendo, G. J., Boselli, A., Pohlen, M., Wilson, C. D., Auld, R., Baes, M., Barlow, M. J., Bock, J. J., Bradford, M., Buat, V., Castro-Rodriguez, N., Chanial, P., Charlot, S., Ciesla, L., Clements, D. L., Cooray, A., Cormier, D., Cortese, L., Davies, J. I., Dwek, E., Eales, S. A., Elbaz, D., Galametz, M., Galliano, F., Gear, W. K., Glenn, J., Gomez, H. L., Griffin, M., Hony, S., Isaak, K. G., Levenson, L. R., Lu, N., Madden, S. C., O'Halloran, B., Okumura, K., Oliver, S., Page, M. J., Panuzzo, P., Papageorgiou, A., Parkin, T. J., Perez-Fournon, I., Rangwala, N., Rigby, E. E., Roussel, H., Rykala, A., Schulz, B., Schirm, M. R. P., Smith, M. W. L., Spinoglio, L., Stevens, J. A., Srinivasan, S., Symeonidis, M., Trichas, M., Vaccari, M., Vigroux, L., Wozniak, H., Wright, G. S., Zeilinger, W. W., Laboratoire d'Astrophysique de Marseille (LAM), and 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)

Subjects
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

International audience; With appropriate spatial resolution, images of spiral galaxies in thermal infrared (similar to 10 mu m and beyond) often reveal a bright central component, distinct from the stellar bulge, superimposed on a disk with prominent spiral arms. ISO and Spitzer studies have shown that much of the scatter in the mid-infrared colors of spiral galaxies is related to changes in the relative importance of these two components, rather than to other modifications, such as the morphological type or star formation rate, that affect the properties of the galaxy as a whole. With the Herschel imaging capability from 70 to 500 mu m, we revisit this two-component approach at longer wavelengths, to see if it still provides a working description of the brightness distribution of galaxies, and to determine its implications on the interpretation of global far-infrared properties of galaxies. We quantify the luminosity of the central component by both a decomposition of the radial surface brightness profile and a direct extraction in 2D. We find the central component contribution is variable within the three galaxies in our sample, possibly connected more directly to the presence of a bar than to the morphological type. The central component's relative contribution is at its maximum in the mid-infrared range and drops around 160 mu m to reach a constant value beyond 200 mu m. The central component contains a greater fraction of hot dust than the disk component, and while the colors of the central components are scattered, colors of the disk components are more homogenous from one galaxy to the next.

Published
2010

2. On the origin of M81 group extended dust emission

Author

Davies, J. I., Wilson, C. D., Auld, R., Baes, M., Barlow, M. J., Bendo, G. J., Bock, J. J., Boselli, A., Bradford, M., Buat, V., Castro-Rodriguez, N., Chanial, P., Charlot, S., Ciesla, L., Clements, D. L., Cooray, A., Cormier, D., Cortese, L., Dwek, E., Eales, S. A., Elbaz, D., Galametz, M., Galliano, F., Gear, W. K., Glenn, J., Gomez, H. L., Griffin, M., Hony, S., Isaak, K. G., Levenson, L. R., Lu, N., Madden, S., O'Halloran, B., Okumura, K., Oliver, S., Page, M. J., Panuzzo, P., Papageorgiou, A., Parkin, T. J., Perez-Fournon, I., Pohlen, M., Rangwala, N., Rigby, E. E., Roussel, H., Rykala, A., Sacchi, N., Sauvage, M., Schulz, B., Schirm, M. R. P., Smith, M. W. L., Spinoglio, L., Stevens, J. A., Srinivasan, S., Symeonidis, M., Trichas, M., Vaccari, M., Vigroux, L., Wozniak, H., Wright, G. S., Zeilinger, W. W., 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 d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Observatoire astronomique de Strasbourg (ObAS), and Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
galaxies: individual: M81, Cosmology and Nongalactic Astrophysics (astro-ph.CO), dust, extinction, galaxies: evolution, galaxies: individual: M81, extinction, [SDU]Sciences of the Universe [physics], Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, dust, galaxies: evolution, Astrophysics::Galaxy Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Galactic cirrus emission at far-infrared wavelengths affects many extragalactic observations. Separating this emission from that associated with extragalactic objects is both important and difficult. In this paper we discuss a particular case, the M81 group, and the identification of diffuse structures prominent in the infrared, but also detected at optical wavelengths. The origin of these structures has previously been controversial, ranging from them being the result of a past interaction between M81 and M82 or due to more local Galactic emission. We show that over of order a few arcminute scales the far-infrared (Herschel 250 &��&m) emission correlates spatially very well with a particular narrow velocity (2-3 km/s) component of the Galactic HI. We find no evidence that any of the far-infrared emission associated with these features actually originates in the M81 group. Thus we infer that the associated diffuse optical emission must be due to galactic light back scattered off dust in our galaxy. Ultra-violet observations pick out young stellar associations around M81, but no detectable far-infrared emission. We consider in detail one of the Galactic cirrus features, finding that the far-infrared HI relation breaks down below arc minute scales and that at smaller scales there can be quite large dust temperature variations., 6 pages, 4 figures, accepted for publication in MNRAS

Published
2010

3. FIR colours and SEDs of nearby galaxies observed with Herschel

Author

Stefano Zibetti, Matthew Joseph Griffin, Diane Cormier, Werner W. Zeilinger, Maud Galametz, L. Spinoglio, E. E. Rigby, Thomas M. Hughes, Andreas Papageorgiou, Aliakbar Dariush, Simone Bianchi, Jonathan Ivor Davies, Dario Fadda, Michael Pohlen, Anthony P. Jones, Marc Sauvage, Leslie K. Hunt, N. Lu, N. Castro-Rodriguez, Daniele Pierini, Gillian S. Wright, Jamie Stevens, Sacha Hony, Laure Ciesla, Herve Wozniak, Eli Dwek, Pierre Chanial, Jacopo Fritz, Kate Gudrun Isaak, Asantha Cooray, Ismael Perez-Fournon, L. Vigroux, Maximilien R. P. Schirm, Jason Glenn, Matthew Smith, D. J. Bomans, George J. Bendo, Alessandro Boselli, Marco Grossi, D. A. Garcia-Appadoo, Mattia Vaccari, M. Bradford, A. Rykala, Suzanne C. Madden, V. Buat, Koryo Okumura, Catherine Vlahakis, S. Sabatini, Christine D. Wilson, B. O'Halloran, Edvige Corbelli, James J. Bock, Frédéric Galliano, L. R. Levenson, Giuseppe Gavazzi, Markos Trichas, Helene Roussel, David L. Clements, Luca Cortese, Marcel Clemens, Benjamin L. Schulz, Seb Oliver, Stephane Charlot, Carlo Giovanardi, Maarten Baes, Emmanuel M. Xilouris, Joris Verstappen, Naseem Rangwala, Stephen Anthony Eales, N. Sacchi, P. Panuzzo, Robbie Richard Auld, T. J. Parkin, S. Sundar, M. J. Page, David Elbaz, M. Symeonidis, S. di Serego Alighieri, Haley Louise Gomez, Walter Kieran Gear, I. De Looze, 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), Science and Technology Facilities Council (STFC), Boselli, A, Ciesla, L, Buat, V, Cortese, L, Auld, R, Baes, M, Bendo, G, Bianchi, S, Bock, J, Bomans, D, Bradford, M, Castro Rodriguez, N, Chanial, P, Charlot, S, Clemens, M, Clements, D, Corbelli, E, Cooray, A, Cormier, D, Dariush, A, Davies, J, De Looze, I, di Serego Alighieri, S, Dwek, E, Eales, S, Elbaz, D, Fadda, D, Fritz, J, Galametz, M, Galliano, F, Garcia Appadoo, D, Gavazzi, G, Gear, W, Giovanardi, C, Glenn, J, Gomez, H, Griffin, M, Grossi, M, Hony, S, Hughes, T, Hunt, L, Isaak, K, Jones, A, Levenson, L, Lu, N, Madden, S, O'Halloran, B, Okumura, K, Oliver, S, Page, M, Panuzzo, P, Papageorgiou, A, Parkin, T, Perez Fournon, I, Pierini, D, Pohlen, M, Rangwala, N, Rigby, E, Roussel, H, Rykala, A, Sabatini, S, Sacchi, N, Sauvage, M, Schulz, B, Schirm, M, Smith, M, Spinoglio, L, Stevens, J, Sundar, S, Symeonidis, M, Trichas, M, Vaccari, M, Verstappen, J, Vigroux, L, Vlahakis, C, Wilson, C, Wozniak, H, Wright, G, Xilouris, E, Zeilinger, W, and Zibetti, S

Subjects
Infrared, Radio galaxy, DUST, Astrophysics, 01 natural sciences, galaxies [infrared], Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, QB, Physics, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], ATLAS, VIRGO CLUSTER, spiral [galaxies], Physical Sciences, astro-ph.CO, Astrophysics::Earth and Planetary Astrophysics, galaxies: ISM, Astrophysics - Cosmology and Nongalactic Astrophysics, galaxies: spiral, Active galactic nucleus, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Metallicity, INFRARED-EMISSION, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astronomy & Astrophysics, Color temperature, infrared: galaxies, cD, FIS/05 - ASTRONOMIA E ASTROFISICA, 0103 physical sciences, Emissivity, STAR-FORMING GALAXIES, DISTRIBUTIONS, Astrophysics::Galaxy Astrophysics, Science & Technology, ISM [galaxies], 010308 nuclear & particles physics, Star formation, Astronomy and Astrophysics, Galaxy, UV, 0201 Astronomical And Space Sciences, SPITZER, SPECTRAL ENERGY-DISTRIBUTION, Physics and Astronomy, 13. Climate action, Space and Planetary Science, galaxies: elliptical and lenticular, cD, elliptical and lenticular [galaxies]
Abstract

We present infrared colours (in the 25-500 mic spectral range) and UV to radio continuum spectral energy distributions of a sample of 51 nearby galaxies observed with SPIRE on Herschel. The observed sample includes all morphological classes, from quiescent ellipticals to active starbursts. Active galaxies have warmer colour temperatures than normal spirals. In ellipticals hosting a radio galaxy, the far-infrared (FIR) emission is dominated bynthe synchrotron nuclear emission. The colour temperature of the cold dust is higher in quiescent E-S0a than in star-forming systems probably because of the different nature of their dust heating sources (evolved stellar populations, X-ray, fast electrons) and dust grain properties. In contrast to the colour temperature of the warm dust, the f350/f500 index sensitive to the cold dust decreases with star formation and increases with metallicity, suggesting an overabundance of cold dust or an emissivity parameter beta, Accepted for publication on A&A, Herschel special issue

Published
2010

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