МЕ

М. Е. Шарина

Special Astrophysical Observatory

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

ИД

И. Д. Караченцев

Special Astrophysical Observatory

V. E. Karachentseva

Main Astronomical Observatory

Andrew E. Dolphin

RTX (United States)

E. K. Grebel

Heidelberg University

Puragra Guhathakurta

University of California, Santa Cruz

Patrick Seitzer

University of Michigan–Ann Arbor

D. Geisler

University of Concepción

P. W. Hodge

University of Washington

D. I. Makarov

Special Astrophysical Observatory

Ata Sarajedini

University of Florida

Cooperative Institutions

Special Astrophysical Observatory

Russian Academy of Sciences

Space Telescope Science Institute

University of California, Santa Cruz

Max Planck Institute for Astronomy

Kazan Federal University

Centre National de la Recherche Scientifique

Isaac Newton Institute

Max Planck Society

Astronomical Institute of the Slovak Academy of Sciences

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Resolving the mystery of the dwarf galaxy HIZSS003

Monthly Notices of the Royal Astronomical Society Letters (2005)

Ayesha Begum Jayaram N. Chengalur И. Д. Караченцев М. Е. Шарина

The nearby galaxy HIZSS003 was recently discovered during a blind HI survey of the zone of avoidance (Henning et al. 2000). Follow up VLA as well as optical and near-IR imaging and spectroscopy (Massey et al. 2003; Silva et al. 2005) confirm that it is a low metallicity dwarf irregular galaxy. However there were two puzzling aspects of the observations, (i) current star formation, as traced by H$α$ emission, is confined to a small region at the edge of the VLA HI image and (ii) the metallicity of the older RGB stars is higher than that of the gas in HII region. We present high spatial and velocity resolution Giant Meterwave Radio Telescope (GMRT) observations that resolve these puzzles by showing that HIZSS003 is actually a galaxy pair and that the HII region lies at the center of a much smaller companion galaxy (HIZSS003B) to the main galaxy (HIZSS003A). The HI emission from these two galaxies overlaps in projection, but can be separated in velocity space. HIZSS003B has an HI mass of 2.6 X 10^6 M$_\odot$, and a highly disturbed velocity field. Since the velocity field is disturbed, an accurate rotation curve cannot be derived, however, the indicative dynamical mass is ~5 X 10^7 M$_\odot$. For the bigger galaxy HIZSS003A we derive an HI mass of 1.4 X 10^7 M$_\odot$. The velocity field of this galaxy is quite regular and from its rotation curve we derive a total dynamical mass of ~6.5 X 10^8 M$_\odot$.

Irregular galaxy

Satellite galaxy

Barred spiral galaxy

10.1111/j.1745-3933.2005.00040.x

Cite

Citations (15)

Andromeda IV, a solitary gas‐rich dwarf galaxy

Astronomische Nachrichten (2016)

И. Д. Караченцев Jayaram N. Chengalur R. Brent Tully Л. Н. Макарова М. Е. Шарина

Abstract Observations are presented of the isolated dwarf irregular galaxy And IV made with the Hubble Space Telescope Advanced Camera for Surveys and the Giant Metrewave Radio Telescope in the 21 cm H I line. We determine the galaxy distance of 7.17 ± 0.31 Mpc using the Tip of Red Giant Branch method. The galaxy has a total blue absolute magnitude of –12.81 mag, linear Holmberg diameter of 1.88 kpc, and an H I ‐disk extending to 8.4 times the optical Holmberg radius. The H I massto‐blue luminosity ratio for And IV amounts 12.9 M ⊙ /L ⊙ . From the GMRT data we derive the rotation curve for the H I and fit it with different mass models. We find that the data are significantly better fit with an iso‐thermal dark matter halo, than by an NFW halo. We also find that MOND rotation curve provides a very poor fit to the data. The fact that the isothermal dark matter halo provides the best fit to the data supports models in which star formation feedback results in the formation of a dark matter core in dwarf galaxies. The total mass‐to‐blue luminosity ratio of 162 M ⊙ /L ⊙ makes And IV among the darkest dIrr galaxies known. However, its baryonic‐to‐dark mass ratio ( M gas + M *)/ M T = 0.11 is close to the average cosmic baryon fraction of 0.15. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Red-giant branch

Dark galaxy

10.1002/asna.201512354

Cite

Citations (9)

Mining the Local Volume

Astrophysics and space science proceedings (2008)

И. Д. Караченцев V. E. Karachentseva W. K. Huchtmeier D. I. Makarov С. С. Кайсин

Virial mass

10.1007/978-1-4020-6933-8_4

Cite

Citations (9)

Chemical composition and ages of four globular clusters in M31 from the analysis of their integrated-light spectra

Open Astronomy (2022)

М. Е. Шарина Margarita Igorevna Maricheva

Abstract We compare the results on the chemical composition of four globular clusters (GCs) in M31 (Bol 6, Bol 20, Bol 45, and Bol 50) (Maricheva M. 2021. Study of integrated spectra of four globular clusters in M 31. Astrophys. Bull. 76:389–404. doi: https://doi.org/10.1134/S199034132104009X) to the available literature data on integrated-light spectroscopy of GCs with similar ages and chemical abundances in our Galaxy and M31 and on the chemical abundances of stars in two galaxies. The clusters and their literature analogues are of moderate metallicity − 1.1 < [ Fe/H ] < − 0.75 -1.1\lt \left[\hspace{0.1em}\text{Fe/H}\hspace{0.1em}]\lt -0.75 dex and old (10 Gyr). Mg, Ca, and C abundances of four GCs are higher than literature estimates for the GCs in M31 with [ Fe/H ] ∼ − 1 \left[\hspace{0.1em}\text{Fe/H}\hspace{0.1em}] \sim -1 dex obtained using high-resolution integrated-light spectroscopy methods. Using literature data, we did not find complete analogues for the studied clusters in our Galaxy and M31 in terms of age, helium mass fraction ( Y Y ), and chemical composition. The alpha-element abundances in four clusters are about 0.2 dex higher than the average for stars in the Galactic field at [ Fe/H ] ∼ − 1 \left[\hspace{0.1em}\text{Fe/H}\hspace{0.1em}] \sim -1 dex. We suggest that these and M. Maricheva’s (Maricheva M. 2021) findings about lower metallicities of the studied objects than the average metallicity of red giants in the M31 halo and about the abundances of alpha-process elements in them corresponding to the average value for stars in the M31 inner halo likely indicate that the star formation process in the vicinity of M31 at the time of our sample cluster formation was complex with the inflow of fresh gas from the intergalactic medium and violent star forming events associated with SNe II bursts.

10.1515/astro-2022-0015

Cite

Citations (0)

Advanced Camera for Surveys Imaging of 25 Galaxies in Nearby Groups and in the Field

The Astronomical Journal (2006)

И. Д. Караченцев Andrew E. Dolphin R. Brent Tully М. Е. Шарина Л. Н. Макарова

We present Hubble Space Telescope Advanced Camera for Surveys images and color-magnitude diagrams for 25 nearby galaxies with radial velocities VLG < 500 km s-1. Distances are determined based on the luminosities of stars at the tip of the red giant branch that range from 2 to 12 Mpc. Two of the galaxies, NGC 4163 and IC 4662, are found to be the nearest known representatives of blue compact dwarf objects. Using high-quality data on distances and radial velocities of 110 nearby field galaxies, we derive their mean Hubble ratio to be 68 km s-1 Mpc-1 with a standard deviation of 15 km s-1 Mpc-1. Peculiar velocities of most of the galaxies, Vpec = VLG - 68D, follow a Gaussian distribution with σv = 63 km s-1 but with a tail toward high negative values. Our data display the known correlation between peculiar velocity and galaxy elevation above the Local Supercluster plane. The small observed fraction of galaxies with high peculiar velocities, Vpec < -500 km s-1, may be understood as objects associated with nearby groups (Coma I, Eridanus) outside the local volume.

Local Group

Supercluster (genetic)

Red-giant branch

Coma Cluster

10.1086/500013

Cite

Citations (132)

VizieR Online Data Catalog: Revised Flat Galaxy Catalogue (RFGC) (Karachentsev+, 1999)

yCat (2000)

И. Д. Караченцев V. E. Karachentseva Yu. N. Kudrya М. Е. Шарина S. L. Parnovsky

Source

Cite

Citations (0)

Ages and chemical compositions of massive globular clusters in NGC147 and M31

IAUGA (2015)

М. Е. Шарина V. V. Shimansky

Source

Cite

Citations (0)

VizieR Online Data Catalog: NGC 628 and companions photometric distances (Sharina+ 1996)

VizieR Online Data Catalog (1996)

М. Е. Шарина И. Д. Караченцев Н. А. Тихонов

Source

Cite

Citations (0)

Age and chemical composition of the globular cluster NGC 6652

Research in Astronomy and Astrophysics (2020)

М. Е. Шарина V. V. Shimansky

We present the results of determination of the age, helium mass fraction (Y), metallicity ([Fe/H]), and abundances of the elements C, N, O, Na, Mg, Ca, Ti, C and Mn for the Galactic globular cluster NGC 6652. We use its medium-resolution integrated-light spectrum from the library of Schiavon and our population synthesis method to fulfill this task. We select the evolutionary isochrone and stellar mass function for our analysis, which provide the best approximation to the shapes and intensities of the observed Balmer line profiles. The determined elemental abundances, age and metallicity are characteristic of stellar populations in the Galactic Bulge.

10.1088/1674-4527/20/8/128

Cite

Citations (2)

The dwarf spheroidal galaxy DDO 44: stellar populations and distance

arXiv (Cornell University) (1999)

И. Д. Караченцев М. Е. Шарина E. K. Grebel Andrew E. Dolphin D. Geisler

We present ground-based and HST WFPC2 imaging of the nearby low surface brightness dwarf spheroidal galaxy DDO 44. For the first time DDO 44 was resolved into stars. The resulting color-magnitude diagram for about 1290 stars shows the red giant branch with a tip at I=(23.55+-0.15) mag, which yields a distance of (3.2+-0.2) Mpc consistent with membership of DDO 44 in the NGC 2403 group. The linear separation of DDO 44 from NGC 2403 is 75 kpc on the sky and (30+-450) kpc along the line of sight. The relationship between the dwarf galaxy's absolute R magnitude of -13.1 mag, its central surface brightness of 24.1 mag/square arcsec, and its mean metallicity of -1.7 dex follow the trend for other nearby dwarf spheroidal galaxies. One globular cluster candidate has also been identified in DDO 44.

Red-giant branch

Absolute magnitude

Dwarf spheroidal galaxy

Surface brightness fluctuation

Irregular galaxy

Local Group

Source

Cite

Citations (0)