We analyze the optical counterpart to the ultra-compact high velocity cloud
AGC 226067, utilizing imaging taken with the Advanced Camera for Surveys (ACS)
on the Hubble Space Telescope. The color magnitude diagram of the main body of
AGC 226067 reveals an exclusively young stellar population, with age
$\sim$7--50 Myr and Fe/H$\sim$$-$0.3, and is consistent with a distance of
$D$$\approx$17 Mpc, suggesting an association with the Virgo cluster. A
secondary stellar system located $\sim$1.6' ($\sim$8 kpc) away in projection
has a similar stellar population. The lack of an old red giant branch
($\gtrsim$5 Gyr) is contrasted with a serendipitously discovered Virgo dwarf in
the ACS field of view (Dw J122147+132853), and the total diffuse light from AGC
226067 is consistent with the luminosity function of the resolved $\sim$7--50
Myr stellar population. The main body of AGC 226067 has a
$M_V$=$-$11.3$\pm$0.3, or $M_stars$=5.4$\pm$1.3$\times$10$^4$ $M_ødot$
given the stellar population. We searched 20 deg$^2$ of imaging data adjacent
to AGC 226067 in the Virgo Cluster, and found two similar stellar systems
dominated by a blue stellar population, far from any massive galaxy counterpart
-- if this population has similar star formation properties as AGC 226067, it
implies $\sim$0.1 $M_ødot$ yr$^-1$ in Virgo intracluster star formation.
Given its unusual stellar population, AGC 226067 is likely a stripped remnant
and is plausibly the result of compressed gas from the ram pressure stripped
M86 subgroup ($\sim$350 kpc away in projection) as it falls into the Virgo
Cluster.
Description
[1702.07719] Hubble Space Telescope Imaging of the Ultra-Compact High Velocity Cloud AGC 226067: A stripped remnant in the Virgo Cluster
%0 Generic
%1 sand2017hubble
%A Sand, D. J.
%A Seth, A. C.
%A Crnojević, D.
%A Spekkens, K.
%A Strader, J.
%A Adams, E. A. K.
%A Caldwell, N.
%A Guhathakurta, P.
%A Kenney, J.
%A Randall, S.
%A Simon, J. D.
%A Toloba, E.
%A Willman, B.
%D 2017
%K cluster formation intra remnant star stripped virgo
%T Hubble Space Telescope Imaging of the Ultra-Compact High Velocity Cloud
AGC 226067: A stripped remnant in the Virgo Cluster
%U http://arxiv.org/abs/1702.07719
%X We analyze the optical counterpart to the ultra-compact high velocity cloud
AGC 226067, utilizing imaging taken with the Advanced Camera for Surveys (ACS)
on the Hubble Space Telescope. The color magnitude diagram of the main body of
AGC 226067 reveals an exclusively young stellar population, with age
$\sim$7--50 Myr and Fe/H$\sim$$-$0.3, and is consistent with a distance of
$D$$\approx$17 Mpc, suggesting an association with the Virgo cluster. A
secondary stellar system located $\sim$1.6' ($\sim$8 kpc) away in projection
has a similar stellar population. The lack of an old red giant branch
($\gtrsim$5 Gyr) is contrasted with a serendipitously discovered Virgo dwarf in
the ACS field of view (Dw J122147+132853), and the total diffuse light from AGC
226067 is consistent with the luminosity function of the resolved $\sim$7--50
Myr stellar population. The main body of AGC 226067 has a
$M_V$=$-$11.3$\pm$0.3, or $M_stars$=5.4$\pm$1.3$\times$10$^4$ $M_ødot$
given the stellar population. We searched 20 deg$^2$ of imaging data adjacent
to AGC 226067 in the Virgo Cluster, and found two similar stellar systems
dominated by a blue stellar population, far from any massive galaxy counterpart
-- if this population has similar star formation properties as AGC 226067, it
implies $\sim$0.1 $M_ødot$ yr$^-1$ in Virgo intracluster star formation.
Given its unusual stellar population, AGC 226067 is likely a stripped remnant
and is plausibly the result of compressed gas from the ram pressure stripped
M86 subgroup ($\sim$350 kpc away in projection) as it falls into the Virgo
Cluster.
@misc{sand2017hubble,
abstract = {We analyze the optical counterpart to the ultra-compact high velocity cloud
AGC 226067, utilizing imaging taken with the Advanced Camera for Surveys (ACS)
on the Hubble Space Telescope. The color magnitude diagram of the main body of
AGC 226067 reveals an exclusively young stellar population, with age
$\sim$7--50 Myr and [Fe/H]$\sim$$-$0.3, and is consistent with a distance of
$D$$\approx$17 Mpc, suggesting an association with the Virgo cluster. A
secondary stellar system located $\sim$1.6' ($\sim$8 kpc) away in projection
has a similar stellar population. The lack of an old red giant branch
($\gtrsim$5 Gyr) is contrasted with a serendipitously discovered Virgo dwarf in
the ACS field of view (Dw J122147+132853), and the total diffuse light from AGC
226067 is consistent with the luminosity function of the resolved $\sim$7--50
Myr stellar population. The main body of AGC 226067 has a
$M_{V}$=$-$11.3$\pm$0.3, or $M_{stars}$=5.4$\pm$1.3$\times$10$^4$ $M_{\odot}$
given the stellar population. We searched 20 deg$^2$ of imaging data adjacent
to AGC 226067 in the Virgo Cluster, and found two similar stellar systems
dominated by a blue stellar population, far from any massive galaxy counterpart
-- if this population has similar star formation properties as AGC 226067, it
implies $\sim$0.1 $M_{\odot}$ yr$^{-1}$ in Virgo intracluster star formation.
Given its unusual stellar population, AGC 226067 is likely a stripped remnant
and is plausibly the result of compressed gas from the ram pressure stripped
M86 subgroup ($\sim$350 kpc away in projection) as it falls into the Virgo
Cluster.},
added-at = {2017-02-28T11:07:12.000+0100},
author = {Sand, D. J. and Seth, A. C. and Crnojević, D. and Spekkens, K. and Strader, J. and Adams, E. A. K. and Caldwell, N. and Guhathakurta, P. and Kenney, J. and Randall, S. and Simon, J. D. and Toloba, E. and Willman, B.},
biburl = {https://www.bibsonomy.org/bibtex/24004961d5a38dcca80a924e79157a458/miki},
description = {[1702.07719] Hubble Space Telescope Imaging of the Ultra-Compact High Velocity Cloud AGC 226067: A stripped remnant in the Virgo Cluster},
interhash = {e0d62a52f40408550f6be2bf97f17b9d},
intrahash = {4004961d5a38dcca80a924e79157a458},
keywords = {cluster formation intra remnant star stripped virgo},
note = {cite arxiv:1702.07719Comment: 9 pages, 4 figures, 1 table. Submitted to the Astrophysical Journal},
timestamp = {2017-02-28T11:07:12.000+0100},
title = {Hubble Space Telescope Imaging of the Ultra-Compact High Velocity Cloud
AGC 226067: A stripped remnant in the Virgo Cluster},
url = {http://arxiv.org/abs/1702.07719},
year = 2017
}