Emmanouil Papastergis
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View article: The Arecibo Legacy Fast ALFA Survey: The ALFALFA Extragalactic H i Source Catalog
The Arecibo Legacy Fast ALFA Survey: The ALFALFA Extragalactic H i Source Catalog Open
We present the catalog of ∼31,500 extragalactic H i line sources detected by the completed Arecibo Legacy Fast ALFA (ALFALFA) survey out to z < 0.06, including both high signal-to-noise ratio (>6.5) detections and ones of lower quality tha…
View article: The $HI$- and $H_{2}$-to-stellar mass correlations of late- and early-type galaxies and their consistency with the observational mass functions
The $HI$- and $H_{2}$-to-stellar mass correlations of late- and early-type galaxies and their consistency with the observational mass functions Open
We compile and carrefully homogenize local galaxy samples with available information on stellar, $\rm HI$ and/or $\rm H_{2}$ masses, and morphology. After processing the information on upper limits in the case of non gas detections, we det…
View article: Another baryon miracle? Testing solutions to the ‘missing dwarfs’ problem
Another baryon miracle? Testing solutions to the ‘missing dwarfs’ problem Open
The dearth of dwarf galaxies in the local universe is hard to reconcile with\nthe large number of low mass haloes expected within the concordance\n$\\Lambda$CDM paradigm. In this paper we perform a systematic evaluation of the\nuncertainti…
View article: From light to baryonic mass: the effect of the stellar mass-to-light ratio on the Baryonic Tully–Fisher relation
From light to baryonic mass: the effect of the stellar mass-to-light ratio on the Baryonic Tully–Fisher relation Open
In this paper we investigate the statistical properties of the Baryonic\nTully-Fisher relation (BTFr) for a sample of 32 galaxies with accurate\ndistances based on Cepheids and/or TRGB stars. We make use of homogeneously\nanalysed photomet…
View article: How to Reconcile the Observed Velocity Function of Galaxies with Theory
How to Reconcile the Observed Velocity Function of Galaxies with Theory Open
Within a Λ cold dark matter (ΛCDM) scenario, we use high-resolution cosmological simulations spanning over four orders of magnitude in galaxy mass to understand the deficit of dwarf galaxies in observed velocity functions (VFs). We measure…
View article: H i in Virgo’s “Red and Dead” Dwarf Ellipticals—A Tidal Tail and Central Star Formation
H i in Virgo’s “Red and Dead” Dwarf Ellipticals—A Tidal Tail and Central Star Formation Open
We investigate a sample of three dwarf elliptical galaxies in the Virgo Cluster that have significant reservoirs of H i . We present deep optical imaging (from CFHT and KPNO), H i spectra (Arecibo), and resolved H i imaging (VLA) of this s…
View article: A new astrophysical solution to the Too Big To Fail problem - Insights from the MoRIA simulations
A new astrophysical solution to the Too Big To Fail problem - Insights from the MoRIA simulations Open
We test whether advanced galaxy models and analysis techniques of simulations can alleviate the Too Big To Fail problem (TBTF) for late-type galaxies, which states that isolated dwarf galaxy kinematics imply that dwarfs live in lower-mass …
View article: An assessment of the “too big to fail” problem for field dwarf galaxies in view of baryonic feedback effects
An assessment of the “too big to fail” problem for field dwarf galaxies in view of baryonic feedback effects Open
Recent studies have established that extreme dwarf galaxies - whether satellites or field objects - suffer from the so called "too big to fail" (TBTF) problem. Put simply, the TBTF problem consists of the fact that it is difficult to expla…
View article: Environmental dependence of the H i mass function in the ALFALFA 70% catalogue
Environmental dependence of the H i mass function in the ALFALFA 70% catalogue Open
We search for environmental dependence of the HI mass function in the ALFALFA\n70% catalogue. The catalogue is split into quartiles of environment density\nbased on the projected neighbour density of neighbours found in both SDSS and\n2MRS…
View article: When is stacking confusing? The impact of confusion on stacking in deep H i galaxy surveys
When is stacking confusing? The impact of confusion on stacking in deep H i galaxy surveys Open
We present an analytic model to predict the H i mass contributed by confused sources to a stacked spectrum in a generic H i survey. Based on the ALFALFA (Arecibo Legacy Fast ALFA) correlation function, this model is in agreement with the e…
View article: When is Stacking Confusing?: The Impact of Confusion on Stacking in Deep HI Galaxy Surveys
When is Stacking Confusing?: The Impact of Confusion on Stacking in Deep HI Galaxy Surveys Open
We present an analytic model to predict the HI mass contributed by confused sources to a stacked spectrum in a generic HI survey. Based on the ALFALFA correlation function, this model is in agreement with the estimates of confusion present…
View article: Spectroscopic confusion: its impact on current and future extragalactic H i surveys
Spectroscopic confusion: its impact on current and future extragalactic H i surveys Open
We present a comprehensive model to predict the rate of spectroscopic confusion in H I surveys, and demonstrate good agreement with the observable confusion in existing surveys. Generically the action of confusion on the H I mass function …
View article: THE ALFALFA “ALMOST DARKS” CAMPAIGN: PILOT VLA HI OBSERVATIONS OF FIVE HIGH MASS-TO-LIGHT RATIO SYSTEMS
THE ALFALFA “ALMOST DARKS” CAMPAIGN: PILOT VLA HI OBSERVATIONS OF FIVE HIGH MASS-TO-LIGHT RATIO SYSTEMS Open
We present new Very Large Array (VLA) H i spectral line imaging of five sources discovered by the ALFALFA extragalactic survey. These targets are drawn from a larger sample of systems that were not uniquely identified with optical counterp…