Prof. Dimitra Rigopoulou: Publications

HerMES: Candidate high-redshift galaxies discovered with Herschel/Spire

Astrophysical Journal 780:1 (2014)

Authors:

CD Dowell, A Conley, J Glenn, V Arumugam, V Asboth, H Aussel, F Bertoldi, M Béthermin, J Bock, A Boselli, C Bridge, V Buat, D Burgarella, A Cabrera-Lavers, CM Casey, SC Chapman, DL Clements, L Conversi, A Cooray, H Dannerbauer, F De Bernardis, TP Ellsworth-Bowers, D Farrah, A Franceschini, M Griffin, MA Gurwell, M Halpern, E Hatziminaoglou, S Heinis, E Ibar, RJ Ivison, N Laporte, L Marchetti, P Martínez-Navajas, G Marsden, GE Morrison, HT Nguyen, B O'Halloran, SJ Oliver, A Omont, MJ Page, A Papageorgiou, CP Pearson, G Petitpas, I Pérez-Fournon, M Pohlen, D Riechers, D Rigopoulou, IG Roseboom, M Rowan-Robinson, J Sayers, B Schulz, D Scott, N Seymour, DL Shupe, AJ Smith, A Streblyanska, M Symeonidis, M Vaccari, I Valtchanov, JD Vieira, M Viero, L Wang, J Wardlow, CK Xu, M Zemcov

Abstract:

We present a method for selecting z > 4 dusty, star-forming galaxies (DSFGs) using Herschel/Spectral and Photometric Imaging Receiver 250/350/500 μm flux densities to search for red sources. We apply this method to 21 deg2 of data from the HerMES survey to produce a catalog of 38 high-z candidates. Follow-up of the first five of these sources confirms that this method is efficient at selecting high-z DSFGs, with 4/5 at z = 4.3-6.3 (and the remaining source at z = 3.4), and that they are some of the most luminous dusty sources known. Comparison with previous DSFG samples, mostly selected at longer wavelengths (e.g., 850 μm) and in single-band surveys, shows that our method is much more efficient at selecting high-z DSFGs, in the sense that a much larger fraction are at z > 3. Correcting for the selection completeness and purity, we find that the number of bright (S 500 μm ≥ 30 mJy), red Herschel sources is 3.3 ± 0.8 deg-2. This is much higher than the number predicted by current models, suggesting that the DSFG population extends to higher redshifts than previously believed. If the shape of the luminosity function for high-z DSFGs is similar to that at z ∼ 2, rest-frame UV based studies may be missing a significant component of the star formation density at z = 4-6, even after correction for extinction. © 2014. The American Astronomical Society. All rights reserved.

Herschel observations and a model for IRAS 08572+3915: A candidate for the most luminous infrared galaxy in the local (z < 0.2) Universe

Monthly Notices of the Royal Astronomical Society: Letters 437:1 (2013)

Authors:

A Efstathiou, C Pearson, D Farrah, D Rigopoulou, J Gracía-Carpio, A Verma, HWW Spoon, J Afonso, J Bernard-Salas, DL Clements, A Cooray, D Cormier, M Etxaluze, J Fischer, E Gonźalez-Alfonso, P Hurley, V Lebouteiller, SJ Oliver, M Rowan-Robinson, E Sturm

Abstract:

We present Herschel photometry and spectroscopy, carried out as part of the Herschel ultraluminous infrared galaxy (ULIRG) survey, and a model for the infrared to submillimetre emission of the ULIRG IRAS 08572+3915. This source shows one of the deepest known silicate absorption features and no polycyclic aromatic hydrocarbon emission. The model suggests that this object is powered by an active galactic nucleus (AGN) with a fairly smooth torus viewed almost edge-on and a very young starburst. According to our model, the AGN contributes about 90 per cent of the total luminosity of 1.1 × 1013 L⊙, which is about a factor of 5 higher than previous estimates. The large correction of the luminosity is due to theanisotropy of the emission of the best-fitting torus. Similar corrections may be necessary for other local and high-z analogues. This correction implies that IRAS 08572+3915 at a redshift of 0.058 35 may be the nearest hyperluminous infrared galaxy and probably the most luminous infrared galaxy in the local (z < 0.2) Universe. IRAS 08572+3915 shows a low ratio of [C II] to IR luminosity (log L[C II]/LIR < -3.8) and a [OI]63 μm to [CII]158 μm line ratio of about 1 that supports the model presented in this Letter ©2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

Erratum to The herschel* pep/hermes luminosity function - i. probing the evolution of PACS selected galaxies to z ̃ 4 [MNRAS 436, (2013) 2875-2876]

Monthly Notices of the Royal Astronomical Society 436:3 (2013) 2875-2876

Authors:

C Gruppioni, L Pozzetti, G Zamorani, H Doḿlnguez-Śanchez, R Genzel, P Chania, S Bardelli, E Zucca, F Pozzi, I Delvecchio, A Cimatti, G Rodighiero, L Marchetti, M Vaccari, A Franceschini, G Mainetti, S Berta, D Lutz, B Magnelli, R Nordon, P Popesso, DJ Rosario, N F orster Schreiber, A Poglitsch, E Sturm, L Tacconi, P Andreani, A Iribarrem, E Hatziminaoglou, V Mainieri, O Ilbert, A Boselli, V Buat, D Burgarella, O Le F evre, E Le Floc'h, L Riguccini, M Sargent, H Aussel, E Daddi, D Elbaz, M Bethermin, S Madden, P Panuzzo, L Monaco, S Oliver, I Roseboom, AJ Smith, L Wang, V Arumugam, RJ Ivison, B Altieri, A Ṕerez Garćla, M Sanchez-Portal, I Valtchanov, A Bongiovanni, J Cepa, N Castro-Rodŕlguez, I Ṕerez-Fournon, M Magliocchetti, R Maiolino, A Amblard, J Bock, A Cooray, CD Dowell, L Levenson, N Lu, HT Nguyen, B Schulz, DL Shupe, CK Xu, M Zemcov, A Cava, DL Clements, B O'Halloran, M Rowan-Robinson, A Conley, J Glenn, E Dwek, S Eales, M Griffin, A Papageorgiou, M Pohlen, E Ibar, G Wright, K Isaak, G Lagache, B Maffei, MJ Page, N Seymour, M Symeonidis, KE Tugwell, CP Pearson, D Rigopoulou, D Scott, JA Stevens, M Trichas, L Vigroux, M Carollo, S Lilly, T Contini, A Renzini, M Scodeggio

Shock Excited Molecules in NGC 1266: ULIRG conditions at the center of a Bulge Dominated Galaxy

(2013)

Authors:

EW Pellegrini, JD Smith, MG Wolfire, BT Draine, AF Crocker, KV Croxall, P van der Werf, DA Dale, D Rigopoulou, CD Wilson, E Schinnerer, BA Groves, K Kreckel, KM Sandstrom, L Armus, D Calzetti, EJ Murphy, F Walter, J Koda, E Bayet, P Beirao, AD Bolatto, M Bradford, E Brinks, L Hunt, R Kennicutt, JH Knapen, AK Leroy, E Rosolowsky, L Vigroux, RHB Hopwood

The James Clerk Maxwell Telescope Nearby Galaxies Legacy Survey - IX. ¹²CO J = 3→2 observations of NGC 2976 and NGC 3351

Monthly Notices of the Royal Astronomical Society 436:1 (2013) 921-933

Authors:

BK Tan, J Leech, D Rigopoulou, BE Warren, CD Wilson, D Attewell, M Azimlu, GJ Bendo, HM Butner, E Brinks, P Chanial, DL Clements, V Heesen, F Israel, JH Knapen, HE Matthews, AMJ Mortier, S Mühle, JR Sánchez-Gallego, RPJ Tilanus, A Usero, P Van der Werf, M Zhu

Abstract:

We present 12CO J = 3→2 maps of NGC 2976 and NGC 3351 obtained with the James Clerk Maxwell Telescope (JCMT), both early targets of the JCMT Nearby Galaxy Legacy Survey (NGLS). We combine the present observations with 12CO J = 1→0 data and find that the computed 12CO J = 3→2 to 12CO J = 1→0 line ratio (R31) agrees with values measured in other NGLS field galaxies. We compute the MH2 value and find that it is robust against the value of R31 used. Using HI data from The HI Nearby Galaxy Survey, we find a tight correlation between the surface density of H2 and star formation rate density for NGC 3351 when 12CO J = 3→2 data are used. Finally, we compare the 12CO J = 3→2 intensity with the polycyclic aromatic hydrocarbon (PAH) 8 μm surface brightness and find a good correlation in the high surface brightness regions. We extend this study to include all 25 Spitzer Infrared Nearby Galaxies Survey galaxies within the NGLS sample and find a tight correlation at large spatial scales. We suggest that both PAH 8 μm and 12CO J = 3→2 are likely to originate in regions of active star formation. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

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