NDLI: Hα Survey of low-mass satellites of the neighboring galaxies M31 and M81

Content Provider	Springer Nature Link
Author	Kaisin, S. S. Karachentsev, I. D.
Copyright Year	2013
Abstract	Images have been obtained at the 6-m telescope at the Special Astrophysical Observatory (SAO) of the Russian Academy of Sciences in the Hα line and in the continuum for 20 dwarf spheroidal satellites of M31: And XI-And XXX, plus the distant Globular cluster Bol 520. Their star formation rates (SFR) are estimated using the Hα flux and the ultraviolet FUV flux measured with the GALEX space telescope. Most of the dSph satellites of M31 have extremely low star formation rates with a characteristic upper limit of SFR ~ 5 × 10-7. We have made similar estimates of SFR from the Hα and FUV fluxes for 13 galaxies with low surface brightness recently discovered in the neighborhood of M81. Eleven of them are physical satellites of M81 with typical SFR < 1 × 10-5. The median stellar masses of these satellites of M31 and M81 are 0.9 and 1.9 million solar masses, respectively. Our Hα observations place a 2-3 times stricter limit on the value of SFR than the data from the GALEX satellite, with a substantially higher (3-5 times) angular resolution.
Starting Page	305
Ending Page	321
Page Count	17
File Format	PDF
ISSN	05717256
Journal	Astrophysics
Volume Number	56
Issue Number	3
e-ISSN	15738191
Language	English
Publisher	Springer US
Publisher Date	2013-09-12
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	galaxies— dwarf galaxies star formation Astronomy, Astrophysics and Cosmology Astrophysics and Astroparticles Extraterrestrial Physics, Space Sciences Astronomy, Observations and Techniques
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics

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