Kinematics of the local universe

Theureau, G.; Bottinelli, L.; Coudreau-Durand, N.; Gouguenheim, L.; Hallet, N.; Loulergue, M.; Paturel, G.; Teerikorpi, P.

doi:10.1051/aas:1998416

Cited by 186 publications

(220 citation statements)

References 5 publications

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“…Our new integrated flux value of 11.41 Jy·km s −1 is higher than past values measured at Arecibo or with single-pointing Nançay measurements (Bothun et al 1985;Lewis 1987;Haynes et al 1997;Theureau et al 1998), suggesting this galaxy has extended H i emission.…”

Section: Ugc 9024contrasting

confidence: 69%

“…An additional step was required for accurate flux calibration of our Nançay data, as it has been found that changes have occurred in the output power of the calibration diode used at Nançay since the early 1990's (see Figure 4 of Theureau et al 1998; see also Thuan et al 2000), resulting in an overall shift of the absolute cali-bration scale. This makes it necessary to appropriately renormalize the fluxes determined via the standard calibration techniques described above (e.g., Theureau et al 1998;Matthews et al 1998;Thuan et al 2000).…”

Section: Calibrationmentioning

confidence: 99%

“…This makes it necessary to appropriately renormalize the fluxes determined via the standard calibration techniques described above (e.g., Theureau et al 1998;Matthews et al 1998;Thuan et al 2000). Matthews et al (1998) showed via a statistical comparison of integrated fluxes measured for ∼30 galaxies at Nançay and elsewhere that applying a scaling factor of 1.26 to the Nançay flux densities very effectively corrects for the above effect, and restores the correct normalization of the Nançay flux scale.…”

Section: Calibrationmentioning

confidence: 99%

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H i observations of giant low surface brightness galaxies

Matthews

Driel

Monnier-Ragaigne

2001

A&A

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Abstract. We have used the Nançay Radio Telescope to obtain new global H i data for 16 giant low surface brightness (LSB) galaxies. Our targets have optical luminosities and disk scale lengths at the high end for spiral galaxies (L B ∼ 10 10 L and h r ∼ >6 kpc for H 0 =75 km s −1 Mpc −1 ), but they have diffuse stellar disks, with mean disk surface brightnesses ∼ >1 magnitude fainter than normal giant spirals. Thirteen of the galaxies previously had been detected in H i by other workers, but the published H i observations were either confused, resolved by the telescope beam, of low signal-to-noise, or showed significant discrepancies between different authors. For the other 3 galaxies, no H i data were previously available. Several of the galaxies were resolved by the Nançay 3 .6 E-W beam, so global parameters were derived from multiple-point mapping observations. Typical H i masses for our sample are ∼ > 10 10 M , with M HI /L B =0.3-1.7 (in solar units). All of the observed galaxies have published optical surface photometry, and we have compiled key optical measurements for these objects from the literature. We frequently find significant variations among physical parameters of giant LSB galaxies reported by various workers.

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Section: Ugc 9024contrasting

confidence: 69%

Section: Calibrationmentioning

confidence: 99%

Section: Calibrationmentioning

confidence: 99%

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H i observations of giant low surface brightness galaxies

Matthews

Driel

Monnier-Ragaigne

2001

A&A

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“…This research has made use of the NASA/IPAC extragalactic database (NED), which is operated by the Jet Propul- Bottinelli et al (1990) and Theureau et al (1998) samples, the line width at 20% and 50% of the peak flux, W50 and W20, were provided, though not for all galaxies. In cases where only W20 was available, a conversion to W50 was made from a linear least-squares fit between these two quantities derived from those for galaxies for which both measurements were available.…”

Section: Discussionmentioning

confidence: 99%

Structure of Disk‐dominated Galaxies. II. Color Gradients and Stellar Population Models

MacArthur

Courteau

Bell

et al. 2004

ASTROPHYS J SUPPL S

210

260

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We investigate optical and near-IR color gradients in a sample of 172 low-inclination galaxies spanning Hubble types S0-Irr. The colors are compared with stellar population synthesis models from which luminosityweighted average ages and metallicities are determined. We explore the effects of different underlying star formation histories and additional bursts of star formation. Our results are robust in a relative sense under the assumption that our galaxies shared a similar underlying star formation history and that no bursts involving more than $10% of the galaxy mass have occurred in the past 1-2 Gyr. Because the observed gradients show radial structure, we measure ''inner'' and ''outer'' disk age and metallicity gradients. Trends in age and metallicity and their gradients are explored as a function of Hubble type, rotational velocity, total near-IR galaxy magnitude, central surface brightness, and scale length. We find strong correlations in age and metallicity with Hubble type, rotational velocity, total magnitude, and central surface brightness in the sense that earlier-type, faster rotating, more luminous, and higher surface brightness galaxies are older and more metal-rich, suggesting an early and more rapid star formation history for these galaxies. The increasing trends with rotational velocity and total magnitude level off for V rot k120 km s À1 and M K P À23 mag, respectively. This effect is stronger for metallicity (than age), which could reflect a threshold potential above which all metals are retained and thus metallicity saturates at the yield. Outer disk gradients are found to be weaker than the inner gradients as expected for a slower variation of the potential and surface brightness in the outer parts. We find that stronger age gradients are associated with weaker metallicity gradients. Trends in gradients with galaxy parameters are compared with model predictions: these trends do not agree with predictions of semianalytic models of hierarchical galaxy formation, possibly owing to the effect of bar-induced radial flows. The observed trends are in agreement with chemo-spectrophotometric models of spiral galaxy evolution based on CDM-motivated scaling laws but none of the hierarchical merging characteristics, implying a strong dependence of the star formation history of spiral galaxies on the galaxy potential and halo spin parameter.

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“…According to Theureau et al (1998) A&A 545, L7 (2012) (Hamuy et al 2003) and 2005gj (Aldering et al 2006;Prieto et al 2007) are also plotted, assuming distance moduli of 37.32 mag and 37.09 mag respectively. Template optical light curves of SN 1991T (Nugent et al 2002) are plotted and scaled to match the absolute uBVri peak magnitudes of SN 1991T presented by Prieto et al (2007) and Saha et al (2001).…”

Section: Observationsmentioning

confidence: 99%

Supernova 2008J: early time observations of a heavily reddened SN 2002ic-like transient

Taddia

Stritzinger

Phillips

et al. 2012

A&A

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Aims. We provide additional observational evidence that some Type Ia supernovae (SNe Ia) show signatures of circumstellar interaction (CSI) with hydrogen-rich material. , we conclude that their CSI emissions are similarly robust. The high-resolution spectrum reveals narrow emission lines produced from un-shocked gas characterized by a wind velocity of ∼50 km s −1 . We conclude that SN 2008J best matches an explosion of a SN Ia that interacts with its CSM.

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Kinematics of the local universe

Cited by 186 publications

References 5 publications

H i observations of giant low surface brightness galaxies

H i observations of giant low surface brightness galaxies

Structure of Disk‐dominated Galaxies. II. Color Gradients and Stellar Population Models

Supernova 2008J: early time observations of a heavily reddened SN 2002ic-like transient

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