Optical and HI properties of isolated galaxies in the 2MIG catalog. I. General relationships

Kudrya, Yu. N.; Караченцева, В. Е.; Караченцев, И. Д.

doi:10.1007/s10511-011-9195-4

Cited by 4 publications

(4 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is in agreement with the results shown in Figure 15, where for log (M * /M ) > 9.5 most galaxies have log (fHI ) < 0. For their higher M * sample Kudrya et al (2011) found a slope (1.00 ± 0.04) in the linear fit of log (MHI /M ) as function of log (M * /M ) which is larger than the slope found here.…”

Section: Scaling Relationscontrasting

confidence: 91%

“…However, some of this deviation may be a result of the difference between the M * estimation method used by Huang et al (2012) and the one used here. Kudrya et al (2011) analysed the MHI -to-M * relation for the 2MIG catalogue of isolated galaxies. The galaxies of the 2MIG catalogue have a range of M * higher than that of the EIG sample (with the bulk in the range 7.5 8 8.5 9 9.5 10 10.5 11 11.5 0…”

Section: Scaling Relationsmentioning

confidence: 99%

See 1 more Smart Citation

EIG – II. Intriguing characteristics of the most extremely isolated galaxies

Spector¹,

Brosch²

2017

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We have selected a sample of 41 extremely isolated galaxies (EIGs) from the local universe using both optical and HI ALFALFA redshifts (Spector & Brosch 2016). Narrow band H α and wide band imaging along with public data were used to derive star formation rates (SFRs), star formation histories (SFHs), and morphological classifications for the EIGs. We have found that the extreme isolation of the EIGs does not affect considerably their star-formation compared to field galaxies. EIGs are typically 'blue cloud' galaxies that fit the 'main sequence of star forming galaxies' and may show asymmetric star formation and strong compact star-forming regions. We discovered surprising environmental dependencies of the HI content, M HI , and of the morphological type of EIGs; The most isolated galaxies (of subsample EIG-1) have lower M HI on average (with 2.5 σ confidence) and a higher tendency to be early-types (with 0.94 confidence) compared to the less isolated galaxies of subsample EIG-2. To the best of our knowledge this is the first study that finds an effect in which an isolated sample shows a higher fraction of early-types compared to a less isolated sample. Both early-type and late-type EIGs follow the same colour-to-M * , SFR-to-M * ('main sequence') and M HI -to-M * relations. This indicates that the mechanisms and factors governing star formation, colour and the M HI -to-M * relation are similar in early-type and late-type EIGs, and that the morphological type of EIGs is not governed by their M HI content, colour or SFR.

show abstract

Section: Scaling Relationscontrasting

confidence: 91%

Section: Scaling Relationsmentioning

confidence: 99%

EIG – II. Intriguing characteristics of the most extremely isolated galaxies

Spector¹,

Brosch²

2017

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

Section: Isolated Galaxies Of the 2mig Catalogmentioning

confidence: 99%

“…Various optical and hydrogen characteristics of the sample of 2MIG galaxies were considered in [19]. According to the authors [19], the completeness of the catalog is about 80% up to the limiting apparent magnitude of K s = 11.5. The isolation criterion selects into the 2MIG catalog 6.2% of the total number of 51572 galaxies with apparent magnitudes of K s < 12.0 m , and angular diameters of a K > 30 ′′ .…”

Section: Isolated Galaxies Of the 2mig Catalogmentioning

confidence: 99%

Faint companions of isolated 2MIG galaxies

2011

Self Cite

View full text Add to dashboard Cite

We present the results of a search for companions around the isolated galaxies from the 2MIG catalog. Among 3227 2MIG galaxies we detected 125 objects with a total of 214 neighbors having radial velocity differences of ∆V < 500 km/s and projected separations of R p < 500 kpc relative to the 2MIG galaxies. The median luminosity of the companions is 1/25 of the luminosity of catalog galaxies, which has little effect on the dynamic isolation of the latter. The median ratio of the orbital mass to the K-luminosity determined from 60 companions of E and S0 2MIG galaxies, 63M ⊙ /L ⊙ , is signficantly greater than that found from the spiral galaxy companions (17M ⊙ /L ⊙ ). We note that a fraction of 2MIG galaxies with companions may be a part of low-contrast diffuse structures: clouds and filaments.

show abstract

Colours of isolated galaxies selected from the Two-Micron All-Sky Survey

Мelnyk

Митронова

Караченцева

2013

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

The properties of isolated galaxies are mainly driven by intrinsic evolution and not by the external influence of their environments. Therefore the isolated galaxy sample may be considered as a reference sample to study different environmental effects. We made detailed comparisons between the near-infrared (2MASS) and optical (SDSS) colours of the 2MASS XSC selected sample of isolated 2MIG galaxies and with other objects from the wide range of denser environments (field, groups/clusters, triplets and pairs). We found that early type galaxies show similar (J − H) rest and (g − r) rest colours practically in all types of environments. Exception is for the massive early type galaxies located in compact pairs with high velocity difference (dV ∼180 km/s), which are significantly redder and brighter than isolated galaxies. We assume that these pairs are located in the centres of more populated groups and clusters. In general, galaxies in groups and pairs of spiral and late morphological types have redder nearinfrared colours (J − H) rest than 2MIG isolated galaxies. The (g − r) rest colours of galaxies in groups and pairs with high velocity difference are also significantly redder than corresponding colours of 2MIG galaxies. On the contrary, the members of most compact pairs (dV ∼50 km/s, R ∼30 kpc) show the same (g − r) rest colour and even tend to be bluer than 2MIG galaxies. In summary, our results show that the colours of galaxies are strongly depend on the external factors.

show abstract

Optical and HI properties of isolated galaxies in the 2MIG catalog. I. General relationships

Cited by 4 publications

References 22 publications

EIG – II. Intriguing characteristics of the most extremely isolated galaxies

EIG – II. Intriguing characteristics of the most extremely isolated galaxies

Faint companions of isolated 2MIG galaxies

Colours of isolated galaxies selected from the Two-Micron All-Sky Survey

Contact Info

Product

Resources

About