VLA observations of neutral hydrogen in Virgo Cluster galaxies. I - The Atlas

Cayatte, V.; Balkowski, C.; Gorkom, J. H. van; Kotanyi, C. G.

doi:10.1086/115545

Cited by 468 publications

(682 citation statements)

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“…It is however reasonable to assume that the cold dust is as extended as the optical disc (Alton et al 1998). The HI gas surface density is available only for a few galaxies in our sample from VLA observations (Cayatte et al 1994). For these objects we observe a good relationship between the HI surface density ΣHI and the HI-deficiency parameter (HI − def), (defined as in Sect.…”

Section: An Alternative Methodsmentioning

confidence: 83%

“…3. The relationship between the HI surface density and the HI-deficiency parameter for the galaxies in common with Cayatte et al (1994). The dashed line gives the best fit to the data.…”

Section: An Alternative Methodsmentioning

confidence: 99%

“…Kennicutt (1989) suggested the existence of a universal relationship between gas surface density at disc scales and star formation activity, known as the Schmidt law (Schmidt 1959), modulated by differential rotation. Even if the total amount of gas in late-type galaxies is dominated by atomic hydrogen (Boselli et al 1997b), which commonly spans a diameter ∼1.8 times the optical disc (Cayatte et al 1994), the molecular phase might dominate the gas column density inside the optical disc (Young & Scoville 1991). An accurate determination of the content and distribution of the molecular gas is thus crucial for studying the interplay between gas and star formation over galactic discs.…”

Section: Introductionmentioning

confidence: 99%

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Molecular gas in normal late-type galaxies

Boselli

Lequeux²,

Gavazzi³

2002

A&A

219

390

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Abstract. We present 12 CO(J = 1-0) line observations of 22 low-luminosity spiral galaxies in the Virgo cluster. These data, together with 244 others available in the literature, allow us to build a large sample that we use to study the molecular gas properties of galaxies spanning a large range of morphological types and luminosities and belonging to different environments (clusters -field). The molecular gas content of the target galaxies is estimated using a luminosity-dependent X = N(H2)/I(CO) conversion factor that has been calibrated on a sample of nearby galaxies. X spans from ∼10 20 mol cm −2 (K km s −1 ) −1 in giant spirals to ∼10 21 mol cm −2 (K km s −1 ) −1 in dwarf irregulars. The value of the X conversion factor is found consistent with a value derived independently from dust masses estimated from FIR fluxes, with a metallicity-dependent dust to gas ratio. The relationships between X and the UV radiation field (as traced by the Hα + [NII]EW), the metallicity and the H band luminosity are analysed. We show that the molecular gas contained in molecular clouds or complexes is of the order of 15% of the total gas on average whatever the luminosity or the Hubble type of the galaxies. We discuss the relation between the star formation rate and the molecular gas content and estimate the average star formation efficiency of late-type galaxies.

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Section: An Alternative Methodsmentioning

confidence: 83%

“…3. The relationship between the HI surface density and the HI-deficiency parameter for the galaxies in common with Cayatte et al (1994). The dashed line gives the best fit to the data.…”

Section: An Alternative Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Molecular gas in normal late-type galaxies

Boselli

Lequeux²,

Gavazzi³

2002

A&A

219

390

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“…Calculations persuaded some people to neglect ram-pressure stripping even while many observations provided indirect evidence for its importance. Spirals near the center of the Virgo cluster are deficient in H I gas (Cayette et al 1990(Cayette et al , 1994Chung et al 2009). Also, ; ; Kormendy (1987), van den Bergh (1994b), and Kormendy et al (2009, hereafter KFCB) suggested that Sph galaxies are ram-pressure-stripped dS+Im galaxies, based in part on observations (Einasto et al 1974;van den Bergh 1994avan den Bergh , 1994bMateo 1998) that -with a few (understandable) exceptions -close dwarf companions of Local Group giant galaxies are almost all spheroidals, that distant companions are irregulars, and that galaxies with intermediate (Sph/Im) morphologies live at intermediate distances.…”

Section: Environmental Processes Imentioning

confidence: 99%

Structure and Evolution of Dwarf Galaxies

Kormendy

2014

Lessons From the Local Group

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Abstract. Different structural parameter correlations show how classical bulge components and elliptical galaxies are different from spiral and S0 galaxy disks, irregular (Im) galaxies, and spheroidal (Sph) galaxies. In contrast, the latter, apparently diverse galaxies or galaxy components have almost identical parameter correlations. This shows that they are related. A review of galaxy transformation processes suggests that S0 and spheroidal galaxies are star-formation-quenched, "red and dead" versions of spiral and Im galaxies. In particular, Sph galaxies are bulgeless S0s. This motivates a parallel sequence galaxy classification in which an S0a-S0b-S0c-Sph sequence of decreasing bulge-to-total ratios is juxtaposed to an Sa-Sb-Sc-Im sequence of star-forming galaxies. All parameter sequences show a complete continuity from giant galaxies to the tiniest dwarfs. Dwarfs are not a new or different class of galaxies. Rather, they are the extreme products of transformation processes that get more important as gravitational potential wells get more shallow. Smaller Sph and S+Im galaxies have lower stellar densities because they retain fewer baryons. Comparison of the baryonic parameter correlations with those for dark matter halos allows us to estimate baryon loss as a function of galaxy mass. Extreme dwarfs are almost completely dominated by dark matter.

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“…NGC 4569 is a bright early-type spiral in the Virgo cluster, one of the few blue-shifted galaxies outside the local group. It is gas-deficient in the outer spiral arms, the neutral hydrogen strongly concentrated in the inner region [1]. The bright nucleus, embedded in a normal stellar bulge, is probably the result of a recent star formation episode [4].…”

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confidence: 99%

NGC 4569: X-Ray Observation of a Spiral Galaxy with Nuclear Starburst Activity

Junkes

Hensler

1996

Symp. - Int. Astron. Union

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We investigate the distribution of soft X-rays and their spectral characteristics for a sample of nearby nuclear starburst galaxies in order to probe their evolution. NGC 4569 is a bright early-type spiral in the Virgo cluster, one of the few blue-shifted galaxies outside the local group. It is gas-deficient in the outer spiral arms, the neutral hydrogen strongly concentrated in the inner region [1]. The bright nucleus, embedded in a normal stellar bulge, is probably the result of a recent star formation episode [4]. Based upon optical spectroscopy of its nucleus [5], the galaxy has been classified as a LINER. The results on NGC 2903 will be presented separatelyOur target was observed with the ROSAT PSPC for « 18 ks. In contrast to NGC 1808, where the bulk of X-ray emission arises from the nucleus [3], the X-ray image of NGC 4569 exhibits extended structure, and contributions from the nuclear region and the disk can be clearly distinguished. In addition, we find weak emission from an extended region at the west side of the galaxy. The global X-ray spectrum of NGC 4569 can be well described by a two-component fit consisting of a power-law component (predominantly from the nucleus) and a thermal plasma component of hot gas from SNRs and superbubbles. The resulting value of hydrogen absorption is in agreement with the Galactic foreground, the total luminosity in the ROSAT band is » 2 χ ΙΟ 40 erg s" 1 . The value of 1.1 χ 10~3 for XX/XFIR is typical for normal spirals with strong star formation predominantly in the nucleus.

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VLA observations of neutral hydrogen in Virgo Cluster galaxies. I - The Atlas

Cited by 468 publications

References 0 publications

Molecular gas in normal late-type galaxies

Molecular gas in normal late-type galaxies

Structure and Evolution of Dwarf Galaxies

NGC 4569: X-Ray Observation of a Spiral Galaxy with Nuclear Starburst Activity

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