Constarium
← Search

Table · dataset · 2025

Star-forming regions of NGC4395 with UV & Ha obs.

Listed in IVOA Registry (Virtual Observatory)

We present a detailed multiwavelength study of star formation in the dwarf galaxy NGC 4395, which hosts an active galactic nucleus (AGN).

Description

From our observations with the Ultra-Violet Imaging Telescope, we have compiled a catalog of 284 star-forming (SF) regions, out of which we could detect 120 SF regions in H{alpha} observations. Across the entire galaxy, we found the extinction-corrected star formation rate (SFR) in the far ultraviolet (UV) to range from 2.0x10^-5^M_{sun}_/yr to 1.5x10^-2^M_{sun}_/yr with a median of 3.0x10^-4^M_{sun}_/yr, and the age to lie in the range of ~1 to 98Myr with a median of 14Myr.

In H{alpha} we found the SFR to range from 7.2x10^-^6M_{sun}_/yr to 2.7x10^-2^M_{sun}_/yr with a median of 1.7x10^-4^M_{sun}_/yr, and the age to lie between 3 to 6Myr with a median of 5Myr. The stellar ages derived from H{alpha} show a gradual decline with galactocentric distance. We found three SF regions close to the center of NGC 4395 with high SFRs both from H{alpha} and UV, which could be attributed to feedback effects from the AGN.

Read the rest (1 more)

We also found six other SF regions in one of the spiral arms having higher SFRs. These are very close to supernova remnants, which could have enhanced the SFR locally. We obtained a specific SFR (SFR per unit mass) for the whole galaxy of 4.64x10^-10^yr^-1^.

Links

Where it is published

Documentation and papers

Catalogue records · 2

Topics

Stated by source
Infrared · Optical · Uv
Inferred from text
Imaging 75%
Provenance · 1 source records, 11 field assertions
SourceKeyLast seenRaw
IVOA Registry (Virtual Observatory)ivo://cds.vizier/j/apj/950/8112 d agoJSON v1
FieldAssertionExtractorEvidence
access_levelsource · IVOA Registryconnector:ivoa_registry@1.0.0
concepts[field].local:field:astronomymapping · IVOA Registryconnector:ivoa_registry@1.0.0
concepts[modality].ivoa_waveband:infraredsource · IVOA Registryconnector:ivoa_registry@1.0.0
concepts[modality].ivoa_waveband:opticalsource · IVOA Registryconnector:ivoa_registry@1.0.0
concepts[modality].ivoa_waveband:uvsource · IVOA Registryconnector:ivoa_registry@1.0.0
concepts[modality].local:modality:imagingenrichment · IVOA Registrykeyword-concept-rules@1.0.0title+description (75%)
descriptionsource · IVOA Registryconnector:ivoa_registry@1.0.0rr.resource.res_description
license_textsource · IVOA Registryconnector:ivoa_registry@1.0.0
publication_datesource · IVOA Registryconnector:ivoa_registry@1.0.0
titlesource · IVOA Registryconnector:ivoa_registry@1.0.0rr.resource.res_title
updated_datesource · IVOA Registryconnector:ivoa_registry@1.0.0