In:
The Astrophysical Journal Supplement Series, American Astronomical Society, Vol. 253, No. 2 ( 2021-04-01), p. 39-
Kurzfassung:
We present the fourth catalog of serendipitously discovered compact extragalactic emission-line sources—H α Dots. A total of 454 newly discovered objects are included in the current survey list. These objects have been detected in searches of moderately deep narrowband images acquired for the ALFALFA H α project. The catalog of H α Dots presented in the current paper was derived from searches carried out using ALFALFA H α images obtained with the KPNO 2.1 m telescope. This results in a substantially deeper sample of Dots compared to our previous lists, which were all discovered in images taken with the WIYN 0.9 m telescope. The median R -band magnitude of the current catalog is 21.59, more than 1.6 mag fainter than the median for the 0.9 m sample (a factor of 4.4× fainter). Likewise, the median emission-line flux of the detected sources is a factor of 4.3× fainter. The line flux completeness limit of the current sample is ~3 × 10 −16 erg s −1 cm −2 . We present accurate coordinates, apparent magnitudes, and narrowband line fluxes for each object in the sample. Unlike our previous lists of H α Dots, the current sample does not include follow-up spectroscopy.
Materialart:
Online-Ressource
ISSN:
0067-0049
,
1538-4365
DOI:
10.3847/1538-4365/abdf4b
Sprache:
Unbekannt
Verlag:
American Astronomical Society
Publikationsdatum:
2021
ZDB Id:
2006860-8
ZDB Id:
2207650-5
SSG:
16,12
